Direct answer: PH 13-8Mo is a high-strength, precipitation-hardening martensitic stainless steel identified as UNS S13800. Engineers choose it when they need a demanding combination of strength, fracture toughness, transverse ductility, and resistance to stress-corrosion cracking. For the DAXUN supply scope discussed on this page, we focus on heavy plate, forgings, and round bar. We do not list PH 13-8Mo pipe, tubing, or thin sheet as standard DAXUN offer forms.

If your drawing simply says “13-8 Mo,” we will not rush to quote by grade name alone. We first want to know whether you need rolled plate, a forged block or shape, or round bar. Those products can share the same UNS number while following different specifications, conversion routes, test locations, ultrasonic requirements, and acceptance values.

That distinction matters most in thick sections. A surface hardness reading may look excellent while the center of a large forging has experienced a different cooling rate. Likewise, a rectangular saw-cut piece from bar does not become certified plate, and a forged block should not be represented as rolled plate. Our job before quotation is to help you place the requirement in the correct product and specification route.

Item	DAXUN quotation scope for this page
Material	PH 13-8Mo precipitation-hardening stainless steel, UNS S13800
Product forms	Heavy plate, forged plate/block or custom forging, and round bar
Common supply condition	Solution heat treated (Condition A), or an agreed aged condition when technically available
Aerospace routes	AMS 5864D for plate; AMS 5629K for bars and forgings within their stated scopes
General industrial ASTM routes	ASTM A693 for flat products, ASTM A564/A564M for bars and shapes, and ASTM A705/A705M for forgings, as applicable
Melt route	VIM plus consumable-electrode remelting when the ordered aerospace specification requires it
Processing to discuss	Saw cutting, rough machining, grinding, solution treatment, aging, and inspection, as confirmed in the quotation
Standard exclusions	Pipe, tubing, and thin sheet are not presented as standard DAXUN PH 13-8Mo supply forms
Documents	MTC and agreed dimensional, heat-treatment, NDT, traceability, or supplementary reports

Exact dimensions, stock, process route, test coverage, and delivery condition remain subject to technical review and written quotation. A standard’s maximum scope is not a promise that every size is immediately available.

What Is PH 13-8Mo Stainless Steel?

PH 13-8Mo is a low-carbon, martensitic precipitation-hardening stainless steel. Its nominal alloy concept combines about 13% chromium, 8% nickel, 2.2% molybdenum, and 1.1% aluminum. Solution treatment develops the martensitic matrix, while subsequent aging forms fine strengthening precipitates. By changing the aging temperature, engineers can move the balance between maximum strength and greater ductility, toughness, and stress-corrosion resistance.

You may see the grade written as PH13-8Mo, PH 13-8 Mo, 13-8Mo, UNS S13800, XM-13, or the European cross-reference 1.4534 / X3CrNiMoAl13-8-2. These names help identify the alloy family; they do not prove that two products are contractually interchangeable.

Designation	How we use it during order review	Important limitation
PH 13-8Mo / 13-8Mo	Common commercial grade name	Does not define product form, standard revision, melt route, or condition
UNS S13800	Unified alloy identifier	Chemistry identity alone does not establish aerospace quality or mechanical acceptance
XM-13	Historical/common ASTM grade reference	The actual ASTM product specification and edition still control
1.4534 / X3CrNiMoAl13-8-2	Common European cross-reference	Do not substitute for AMS or ASTM material without engineering approval
H950 to H1150	Aging-condition designations based on nominal Fahrenheit temperature	Full time, temperature tolerance, cooling method, and prior condition must follow the governing specification

One feature separates premium aerospace PH 13-8Mo from a generic chemistry match: melt quality. AMS 5629K explicitly covers premium aircraft-quality material produced by vacuum induction melting plus consumable-electrode remelting. Producer literature commonly describes this route as VIM-VAR.

This route supports cleanliness, chemical homogeneity, and reliable transverse properties. However, the MTC and approved source must confirm it. We never infer VIM-VAR from an UNS number alone.

Why Buyers Choose PH 13-8Mo for Thick and Highly Loaded Parts

Customers rarely choose this alloy because they need “another stainless steel.” Usually, a designer is trying to solve several problems at once:

The part needs substantially higher strength than an austenitic stainless steel can normally provide.
A large section needs useful longitudinal and transverse ductility rather than strength at the surface only.
Fracture toughness, fatigue resistance, and cleanliness matter in a safety-critical component.
The service creates concern about stress-corrosion cracking in a high-strength steel.
The component must remain corrosion resistant in a compatible environment while carrying a high mechanical load.

PH 13-8Mo can answer that combination well, but only after the team chooses the product form, aging condition, test orientation, and corrosion assumptions correctly.

H950 may attract attention because it produces the highest strength. However, a higher aging condition can be the wiser choice when toughness, dimensional stability, machining response, or stress-corrosion resistance carries more weight.

Heavy Plate, Forging, or Round Bar: Which Form Do You Actually Need?

The outline of a finished part does not tell us which starting form is correct. We look at load direction, section size, machining removal, grain flow, material utilization, test access, and the governing drawing.

Product form	Best fit	Engineering advantage	Purchasing point often missed
Rolled heavy plate	Wide, relatively flat machined or structural parts	Predictable rolling directions and efficient nesting	Specify longitudinal, long-transverse, and short-transverse orientation
Forged plate or block	Very thick rectangular sections or parts outside a rolled-plate route	Forging can consolidate the section and tailor reduction and grain flow	A forged block remains a forging; define reduction, coupon location, heat treatment, and NDT
Custom open-die or closed-die forging	Shafts, disks, rings, lugs, landing-gear or actuator shapes	Grain flow can follow part geometry and reduce unfavorable short-transverse loading	Send the forging drawing, allowance, radii, grain-flow expectation, and qualification plan
Round bar	Shafts, pins, fasteners, valve parts, and cylindrical components	Efficient turning, grinding, and bar-level traceability	State whether hot-finished, forged, peeled, turned, ground, or cold-finished material is required

A critical plate boundary: AMS 5864D covers PH 13-8Mo plate only through 3.00 in. (76.2 mm), inclusive. If your part needs a thicker rectangular section, please do not write “AMS 5864 plate” automatically.

We may need to review an ASTM plate route, an AMS 5629 or ASTM A705 forging route, or a customer-controlled forged-block specification. The final answer depends on the drawing and the design authority.

Similarly, AMS 5629K covers bars and forgings up to 12 in. (305 mm) nominal diameter or least distance between parallel sides in the solution-treated condition, plus stock of any size for subsequent forging, rings, or extrusion. That is a specification scope, not DAXUN’s guaranteed stock range.

PH 13-8Mo Standards and Product Responsibilities

The following map uses the standards current at the technical review date of this article, 15 July 2026. Your purchase order should still state the required edition because customer approvals and legacy drawings may control a different revision.

Padrão	Product covered for this article	What the buyer should state
SAE AMS 5864D	VIM plus consumable-electrode-remelted plate up to 76.2 mm	Thickness, dimensions, Condition A or aging responsibility, NDT, and drawing requirements
SAE AMS 5629K	Premium aircraft-quality bars and forgings, among other listed forms	Exact form, size, melt route, condition, test direction, NDT class, and approved source
ASTM A564/A564M-25	Hot- or cold-finished precipitation-hardening bars and shapes	Bar form, finish, condition, dimensions, supplementary tests, and general requirements
ASTM A705/A705M-23	Age-hardening stainless steel forgings	Forging drawing, condition, heat treatment, mechanical tests, impact requirements, and supplementary controls
ASTM A693-24	Precipitation-hardening stainless flat products	Required heavy-plate route; do not infer aerospace melt quality from ASTM compliance
AMS-STD-2154E	Ultrasonic inspection process for wrought metals	Coverage, class, reference standard, scan surfaces, and acceptance level
ASTM A388/A388M-26	Contact ultrasonic examination of steel forgings	Required quality level, coverage, calibration, scan direction, and reporting

An alloy cross-reference never replaces a product specification. “UNS S13800, H1000” still leaves unanswered whether the product is plate, bar, or forging; whether it is VIM-VAR; where the tensile coupon comes from; and which ultrasonic indications are acceptable.

ASTM A693 flat products are generally furnished solution annealed, with aged test samples used to demonstrate the precipitation-hardening response. ASTM A564 likewise places XM-13 bar in its specified solution-annealed delivery route.

The current AMS 5629K and AMS 5864D scopes also describe solution-heat-treated, precipitation-hardenable products. Therefore, if you want finished stock delivered in H950, H1000, or another aged condition, identify that requirement and the party responsible for final aging. Then verify that the requested certification route permits it.

For aerospace, nuclear, pressure-containing, or other regulated work, material compliance does not certify the finished component. The design organization and equipment manufacturer remain responsible for design, machining, welding, final heat treatment, NDT, code calculations, source approval, and completed-component conformity.

Chemical Composition of PH 13-8Mo

The following limits come from ATI’s published PH 13-8Mo plate and bar product data. Contractual acceptance must follow the exact material specification, approved producer requirements, and final MTC. An AMS or customer-controlled premium route may impose tighter residual-element controls.

Elemento	Mass fraction, wt.%	Why it matters
Carbon, C	0.05 max	Low carbon supports toughness and welding-process control
Manganese, Mn	0.20 max	Residual-element control supports consistency
Silicon, Si	0.10 max	Controlled residual and deoxidizer level
Phosphorus, P	0.010 max	Low limit supports toughness and cleanliness
Sulfur, S	0.008 max	Low sulfur reduces inclusions and directional property loss
Chromium, Cr	12.25–13.25	Provides the stainless corrosion-resisting base
Nickel, Ni	7.50–8.50	Supports transformation behavior and toughness
Molybdenum, Mo	2.00–2.50	Supports corrosion resistance and the strength-toughness balance
Aluminum, Al	0.90–1.35	Principal precipitation-hardening addition
Iron, Fe	Equilíbrio	Base metal

Handheld XRF can help confirm chromium, nickel, and molybdenum identity, but it does not verify the complete chemistry table. Carbon and other low-level elements require suitable laboratory methods.

Therefore, we use heat traceability and the MTC as the primary release path. Independent chemical analysis should be added only when the purchase order requires it.

Condition A and Precipitation-Hardening Conditions

PH 13-8Mo normally reaches the customer in solution-treated Condition A or an agreed aged condition. Published producer guidance uses a solution-treatment temperature of approximately 927°C (1700°F), followed by air cooling. Cooling below approximately 16°C (60°F) is recommended to promote complete martensitic transformation before aging.

Large sections demand more than copying a temperature from a datasheet. Furnace loading, thermocouple placement, time after the coldest point reaches temperature, transfer time, cooling access, section geometry, and the lowest achieved temperature can all influence the center.

Estado	Nominal aging temperature	Typical producer hold	General property direction
H950	510°C / 950°F	4 h, air cool	Highest strength; lower ductility and greater process sensitivity
H1000	538°C / 1000°F	4 h, air cool	Very high strength with a more balanced toughness/SCC profile
H1025	552°C / 1025°F	4 h, air cool	Intermediate strength and ductility
H1050	566°C / 1050°F	4 h, air cool	Lower strength with higher ductility and toughness
H1100	593°C / 1100°F	4 h, air cool	Greater ductility and dimensional stability
H1150	621°C / 1150°F	4 h, air cool	Lower strength with high ductility
H1150M	760°C for 2 h, air cool; then 621°C for 4 h, air cool	Two-stage cycle	Controlled overaged condition often used to improve machinability

These temperatures summarize producer practice. They do not replace the time and tolerance requirements in AMS, ASTM, a customer process specification, or a drawing.

Never age material directly from an unknown prior condition. First confirm that the material received the required solution treatment and transformation cycle.

Allow for Dimensional Contraction

Aging causes a small but measurable dimensional change. Published ARMCO data give the following approximate linear contraction from Condition A.

Aging condition	Approximate contraction, in./in.
H950	0.0004–0.0006
H1000	0.0004–0.0006
H1050	0.0005–0.0008
H1100	0.0008–0.0012
H1150	Approximately 0.0030
H1150M	Approximately 0.0035

For a precision part, we normally ask who will perform aging and whether final machining happens before or after that operation. The answer determines machining allowance, distortion planning, datum strategy, and responsibility for final dimensions.

Mechanical Properties: Read the Test Context Before the Numbers

The following table shows a published property trend for 15.9 mm (0.625 in.) bar. It helps compare H950 through H1150, but these values are not automatic guarantees for heavy plate, large round bar, or a thick forging.

Estado	0.2% yield strength, MPa	Tensile strength, MPa	Alongamento, %	Reduction of area, longitudinal/transverse, %
H950	1415	1515	10	45 / 35
H1000	1310	1415	10	50 / 40
H1025	1205	1275	11	50 / 45
H1050	1140	1205	12	50 / 45
H1100	931	1035	14	50 / 50
H1150	620	931	14	50 / 50

Why are we so careful with this table? Because a value without product form, size, orientation, heat-treatment lot, and test location can mislead a designer.

ATI, for example, publishes an H1000 plate reference minimum of approximately 1413 MPa tensile strength, 1310 MPa yield strength, 10% elongation, and 43 HRC. That does not make the same values universal for every ASTM route or every thickness.

For a thick-section order, please define:

Required aging condition and whether testing occurs after final heat treatment.
Tensile orientation: longitudinal, transverse, or another drawing-defined direction.
Coupon location: surface, quarter-thickness, mid-radius, center, prolongation, or sacrificial block.
Whether the coupon is integral, attached, separately forged, or heat-treated with the production lot.
Required tensile, yield, elongation, reduction of area, hardness, Charpy impact, fracture toughness, or fatigue data.
Retest rules and lot definition.

Hardness offers a fast process-control signal, although it cannot replace tensile or toughness testing.

Estado	Published HBW reference	How to use it
Solution treated	363 max	Confirm Condition A response and screen for unintended hardening
H950	430 min	Verify high-strength aging response within the ordered test plan
H1000	400 min	Use with tensile results and heat-treatment records
H1050	372 min	Do not interpolate an unlisted condition without the governing specification
H1100	313 min	Confirm the expected reduction as aging temperature rises
H1150	283 min	Evaluate with strength, ductility, and application requirements
H1150M	302 max	Identify the controlled overaged condition; it is not equivalent to H1150

The current Carpenter hardness table does not list a separate H1025 value. We leave it out rather than inventing one. The governing standard and actual test report should provide the acceptance basis.

Useful Physical Data

Imóveis	Published reference value	Design note
Densidade	About 7.74 g/cm³ in Condition A; 7.76 g/cm³ in H1000	Use the design-approved value for mass calculations
Elastic modulus	Approximately 194–202 GPa	Source and test method still matter
Mean thermal expansion coefficient, 21–93°C	Approximately 10.4 × 10⁻⁶/°C in H1000	Consider machining temperature and service growth
Magnetism	Martensitic PH stainless; magnetic	Do not select where a nonmagnetic alloy is mandatory without approval

These figures are producer reference data, not purchasing acceptance limits.

Thick-Section Engineering: What Changes at the Center?

For PH 13-8Mo heavy plate and forgings, the centerline deserves deliberate attention. Thick material creates longer thermal paths, while a large forging can contain different working histories from surface to core.

Thick-section concern	What can happen	How to control the risk
Cooling after solution treatment	The center may cool more slowly and transform differently	Use a qualified cycle, suitable loading, a thermocouple plan, and section-aware cooling
Forging reduction	Insufficient working may leave segregation or weak consolidation	State minimum reduction or an approved forging procedure
Grain-flow direction	A machined feature may load the least favorable direction	Review the forging sketch, part orientation, and test direction
Centerline cleanliness	Internal discontinuities become commercially important in large sections	Define UT method, coverage, reference reflectors, class, and acceptance
Mechanical-property location	Surface coupons may not represent the center	Specify quarter-thickness, mid-radius, center, or drawing-defined sampling
Residual stress and distortion	Rough machining and aging can move critical datums	Use balanced stock removal and adequate final allowance
Section transitions	Heavy-to-thin geometry changes heating, cooling, and strain	Review forging design and heat-treatment fixturing

This is why “same heat number” is necessary but not always sufficient. For critical parts, the purchase order should connect heat identity, forging lot, heat-treatment lot, test coupon, NDT report, and final piece marking.

How PH 13-8Mo Heavy Plate, Forgings, and Round Bar Are Produced

The exact manufacturing chain depends on the selected source mill and order. We do not imply that every operation occurs on one DAXUN-owned line.

DAXUN reviews the required route, coordinates supply and agreed processing, checks the release documents, and preserves traceability within the scope stated in the quotation.

Stage	Heavy plate route	Forging route	Round-bar route
Contract review	Confirm standard, thickness, direction, condition, UT, and drawing	Confirm forging drawing, stock, reduction, grain flow, test material, and NDT	Confirm diameter, finish, condition, straightness, length, and UT
Melting/remelting	VIM plus the required remelt route; verify source and heat identity	Use the specified premium melt route when ordered	Do not infer aerospace quality from UNS alone
Primary conversion	Break down the ingot to slab with controlled hot work	Convert billet or ingot through open- or closed-die forging	Convert billet by forging or rolling
Product forming	Hot roll with controlled reductions and directions	Forge to the approved envelope, flow direction, and allowance	Roll or forge to round and straighten as applicable
Tratamento térmico	Solution treat; age only when ordered and approved	Use a section-aware solution cycle, then age when required	Solution treat and age by lot when ordered
Surface preparation	Descale, grind, machine, or finish as specified	Rough machine inspection surfaces and remove scale	Turn, peel, grind, or centerless grind when ordered
Inspection	Dimensions, surface, mechanical tests, hardness, UT, and traceability	Dimensions, tests, UT, MT/PT, and forging records as ordered	Diameter, straightness, surface, testing, UT, and identity
Cutting and packing	Use the agreed cutting process without changing certification origin	Mark each piece and protect inspection surfaces	Cut to length, transfer heat identity, bundle or crate

Published producer guidance uses forging temperatures around 1177–1204°C (2150–2200°F) and recommends completing substantial final reduction below approximately 1038°C (1900°F) before air cooling.

These figures are process guidance, not a substitute for an approved forging procedure, especially for aerospace parts or very large cross-sections.

Inspection and Quality Control for PH 13-8Mo

Quality control begins before production. If a customer requests “UT and 3.1 certification” only after the material has already been produced, the required coverage, acceptance class, or witnessing may no longer be possible.

We prefer to settle the inspection plan while the quotation remains open.

Control step	What we review or arrange	What the RFQ should define
Contract review	Product form, standard edition, condition, dimensions, source restrictions, and drawing notes	Governing documents and order of precedence
Melt and chemistry verification	Heat number, MTC chemistry, melt/remelt route, and traceability	Approved source and independent chemistry requirements
Heat-treatment control	Furnace/cycle record and lot identity when included	Condition, process specification, pyrometry, thermocouple, and chart requirements
Mechanical testing	Tensile, yield, elongation, reduction of area, hardness, impact, or other tests	Temperature, direction, location, quantity, lot definition, and acceptance values
Ultrasonic testing	Wrought-product or forging UT according to the ordered method	Revision, class, scan directions, coverage, surface state, and report format
Surface NDT	Magnetic-particle or penetrant testing when suitable and ordered	Method, stage, coverage, indication evaluation, and acceptance criteria
Macro/micro examination	Macroetch, grain size, inclusion cleanliness, or microstructure	Sampling location, method, rating system, and acceptance limit
Dimensional inspection	Plate thickness/flatness, forging envelope, bar diameter/straightness	Drawing, tolerances, datums, frequency, and report requirements
Final release	Marking, identity transfer, certificate review, packing, and document index	Certificate type, reports, language, legalization, and destination requirements

AMS-STD-2154E provides ultrasonic methods for wrought metals, while ASTM A388/A388M-26 covers contact ultrasonic examination of steel forgings.

Neither “UT tested” nor a test-method number is enough. The order must also state the acceptance class or quality level, scan coverage, reference basis, and reporting requirement.

Because PH 13-8Mo is ferromagnetic in its martensitic condition, magnetic-particle testing can detect suitable surface and near-surface discontinuities. Liquid penetrant testing remains useful for surface-breaking indications on accessible nonporous surfaces.

The drawing or inspection plan must choose the method and acceptance criteria. A laboratory should not invent them after examination.

Third-party inspection can be discussed before quotation. Please identify the inspection body, document-review points, witness or hold points, test scope, acceptance criteria, report format, inspection location, and cost responsibility.

An MTC, EN 10204 certificate type, third-party stamp, or aerospace release document should be requested by its exact contractual name rather than treated as interchangeable paperwork.

Machining, Grinding, and Welding Considerations

PH 13-8Mo rewards process planning. Its high strength means that tooling, residual stress, and final aging sequence deserve more attention than they would for a soft annealed stainless grade.

Machining: Condition A is commonly selected for machining before final aging, while H1150M may improve machinability for some routes. Use rigid setups, sharp tools, controlled feeds, and effective cooling. Avoid rubbing because work hardening and heat can shorten tool life.

On a large block, remove material in a balanced sequence and leave enough allowance for movement during aging.

Grinding: Control heat input and surface integrity. If the part is fatigue critical, the drawing may require burn inspection, controlled stock removal, or a specified final surface direction. These are component requirements, not automatic material-certificate tests.

Welding: The alloy can be welded with qualified procedures, but a weld changes the local thermal history. The fabricator must control cleanliness, filler selection, interpass practice, post-weld heat treatment, distortion, and final NDT.

Supplying AMS or ASTM PH 13-8Mo base material does not certify the completed weldment or restore parent-metal properties automatically.

Corrosion and Embrittlement Boundaries

Producer data describe PH 13-8Mo general corrosion resistance as approaching Type 304 in many media and better than common 400-series martensitic stainless steels.

Other producer data note that its performance can be below 17-4PH in certain strongly oxidizing or reducing environments. Both statements can be true because corrosion depends on the medium, concentration, temperature, aeration, deposits, crevices, surface condition, and applied stress.

We do not present PH 13-8Mo as a universal substitute for 316L, duplex stainless steel, or a nickel alloy.

Before selection, send us or your corrosion engineer the real service data:

Normal and upset process chemistry
Chloride concentration
pH range
Maximum metal temperature
Cleaning chemicals
Crevice geometry
Galvanic contacts
Applied potential
Expected stress

Stress-corrosion resistance generally improves as the alloy is aged away from the maximum-strength H950 condition. Producer guidance often considers H1000 or a higher aging temperature when SCC resistance carries more weight.

The design authority must still choose the final condition using validated environmental and mechanical data.

Hydrogen deserves equal attention. Like other ultra-high-strength martensitic steels, PH 13-8Mo can become vulnerable to hydrogen-assisted cracking.

Acid pickling, electroplating, cathodic cleaning, corrosion under cathodic protection, or unsuitable process delays can introduce hydrogen. Plating specifications, cleaning procedures, baking requirements, maximum delay times, and verification belong in the finished-part process plan.

PH 13-8Mo vs. 17-4PH Stainless Steel

These precipitation-hardening grades sometimes appear on the same shortlist, but they are not drop-in substitutes.

Selection point	PH 13-8Mo / UNS S13800	17-4PH / UNS S17400
Strengthening system	Aluminum-containing precipitation system	Copper-containing precipitation system
Typical premium route	Frequently specified VIM-VAR for aerospace products	Available through broader commercial and aerospace routes
Main attraction	High strength, fracture toughness, transverse properties, cleanliness, and SCC capability	Broad availability, familiar processing, and practical strength/corrosion balance
Product availability	More specialized; this page focuses on heavy plate, forgings, and round bar	Widely available in plate, sheet, bar, forgings, and other forms
Corrosion decision	Good in compatible media, but environment and aging condition matter	Also environment-dependent and may perform better in some media
Cost and lead time	Usually higher and more source-sensitive	Often more economical and easier to source
Substitution rule	Requires design-authority approval	Requires design-authority approval

If a drawing requires PH 13-8Mo, we do not suggest 17-4PH merely because both can reach high strength. Fracture toughness, transverse performance, melt cleanliness, SCC qualification, and the approved-material list may be the reasons the designer selected S13800.

Common Applications by Product Form

Aplicação	Common starting form	Why PH 13-8Mo may be selected	What still needs confirmation
Aircraft structural and landing-gear components	Forging, heavy plate, or bar	Strength, fracture toughness, transverse performance, and cleanliness	Approved source, AMS route, grain flow, fracture mechanics, NDT, and process qualification
Actuator shafts, pins, and fasteners	Round bar or forging	High yield strength and corrosion resistance	Final condition, thread process, surface treatment, hydrogen control, and fatigue testing
Valve stems and pressure-control parts	Round bar or forging	Strength and resistance in selected industrial fluids	Fluid compatibility, code status, pressure-boundary responsibility, and impact requirements
Gears, couplings, and drive components	Forged blank or bar	High core strength and good toughness balance	Surface treatment, distortion, contact fatigue, and hardness profile
Energy and nuclear auxiliary parts	Forging or heavy plate	Clean material, thick-section capability, and high mechanical performance	Project specification, source approval, corrosion data, and nuclear QA
Semiconductor and precision equipment	Plate, forged block, or bar	Strength, controlled dimensional stability, and clean premium material	Cleanliness, magnetic behavior, contamination limits, finish, and process sequence

The application name does not certify suitability. Aerospace, nuclear, pressure-equipment, and semiconductor projects may each impose approval systems beyond the base material standard.

What Controls PH 13-8Mo Price and Lead Time?

A useful price cannot come from grade and weight alone. PH 13-8Mo is source-sensitive, and one inspection clause can change the production route more than a small dimensional change.

When comparing quotations, make sure each supplier has priced the same technical package.

Cost or schedule driver	Why it matters
Approved melt source and remelt route	Aerospace material and source approvals narrow the supply base
Product form and section size	Plate, forged block, custom forging, and large bar use different production routes
Condition and heat-treatment responsibility	Final aging, furnace qualification, and thermocouple requirements change process time
Forging geometry and reduction	Dies, open-die operations, flow controls, test prolongations, and allowances affect input weight
Mechanical sampling	Extra orientations, center coupons, impact sets, and fracture testing add time and material
UT and surface NDT	Higher sensitivity, greater coverage, and formal reports add operations
Documentation and source surveillance	Charts, source records, hold points, and release documents require planning
Quantity and cutting yield	A small part may require a much larger qualified parent plate, bar, or forging stock
Packing and logistics	Custom crates, heavy lifting, urgent air freight, and destination rules affect delivered cost

We would rather explain these factors than quote an attractive number against an incomplete scope. Send inspection and certification clauses with the first inquiry so we can separate mandatory costs from optional testing.

Packaging, Marking, and Export Delivery

We plan packing around product mass, machined surfaces, corrosion-protection compatibility, lifting, and traceability.

Product	Practical packing approach	Traceability point
Heavy plate	Protected faces, edge protection, strong skid or pallet, waterproof wrapping, and agreed lifting plan	Keep heat, lot, and piece marks visible or transfer them to an approved tag/map
Round bar	Bundles or wooden cases with separators, waterproof wrapping, and secure strapping	Mark each bar or bundle and preserve cut-piece identity
Forjamento	Custom skid or case, protected machined/UT surfaces, moisture barrier, and lifting points	Match piece number, forging lot, heat-treatment lot, and certificate index

Temporary rust preventive, desiccant, vacuum-barrier packing, export wood compliance, sea freight, or urgent air shipment can be discussed.

The protective material must remain compatible with the customer’s cleaning, welding, vacuum, or semiconductor process.

What to Confirm Before Ordering PH 13-8Mo

The fastest quotation is not the shortest RFQ. A clear technical package lets us compare the correct source, process, and test plan the first time.

RFQ field	Information to send
Product form	Rolled heavy plate, forged plate/block, custom forging, or round bar
Material identity	PH 13-8Mo / UNS S13800 and any approved-producer restriction
Governing standard	AMS 5864, AMS 5629, ASTM A693, ASTM A564, ASTM A705, or customer specification, including revision
Estado	Condition A, H950, H1000, H1025, H1050, H1100, H1150, H1150M, or customer cycle
Dimensões	Finished and stock sizes, machining allowance, length, quantity, and piece-weight limits
Drawing controls	Grain flow, rolling direction, datums, radii, test prolongations, and identification zones
Surface/finish	As-rolled, descaled, ground, peeled, turned, machined, or another measurable requirement
Mechanical tests	Values, orientation, location, temperature, frequency, lot definition, and coupon disposition
NDT	Method, revision, acceptance class, coverage, scan direction, stage, and report
Documentation	MTC, certificate type, melt-route evidence, heat-treatment charts, NDT reports, and source approval
Third-party inspection	Agency, witness/hold points, scope, location, notice period, and acceptance authority
Aplicação	Component, load direction, environment, design temperature, regulatory route, and critical risks
Logistics	Destination, Incoterm, packing, lifting limits, marking, and required date

Why Discuss the Order With DAXUN?

We know that PH 13-8Mo inquiries often arrive with a difficult drawing and very little room for material ambiguity. Our useful role is not to repeat the grade name back to you.

We help separate plate, bar, and forging requirements, identify where a standard stops, discuss processing and inspection before quotation, and keep the agreed heat, lot, test, and piece documents connected through delivery.

DAXUN works across stainless steel and other engineering-alloy product forms, with cutting and processing options subject to quotation. We confirm actual source, dimensions, condition, inspection, certification, and schedule for each order.

Where a requirement falls outside a standard or our confirmed scope, we say so before production rather than hiding it in general sales language.

Perguntas mais frequentes

What is PH 13-8Mo stainless steel?

PH 13-8Mo is a martensitic precipitation-hardening stainless steel, UNS S13800, designed for high strength together with good fracture toughness, transverse ductility, and stress-corrosion resistance. Its properties depend strongly on solution treatment, aging condition, section size, and product specification.

Does DAXUN supply PH 13-8Mo pipe or thin sheet?

Not as standard forms within this page’s DAXUN supply scope. We focus on PH 13-8Mo heavy plate, forgings, and round bar. Any request for a different form requires a separate source, standard, and availability review.

Which standard applies to PH 13-8Mo heavy plate?

AMS 5864D is the direct aerospace plate specification and covers nominal thickness through 76.2 mm. ASTM A693 may apply to an industrial flat-product order when correctly invoked. A thicker rectangular section may require a forged-block route.

Is AMS 5629 used for both round bar and forgings?

Yes. The current AMS 5629K scope includes premium aircraft-quality bars and forgings, along with other listed wrought forms. The order must still distinguish the exact form, dimensions, condition, test orientation, NDT class, and source approval.

Which condition gives the highest strength?

H950 generally gives the highest strength among the common aging conditions. H1000 and higher temperatures trade some strength for greater ductility, toughness, dimensional stability, and often better stress-corrosion behavior.

Can a saw-cut rectangular piece from round bar be certified as plate?

No. Cutting changes geometry, not product origin or certification. The piece remains derived from bar, with the bar’s working direction, specification, test basis, and dimensional history.

What ultrasonic standard should I specify?

AMS-STD-2154E is commonly used for aerospace wrought products. ASTM A388/A388M-26 addresses steel forgings when invoked by the order. In both cases, state the acceptance class, coverage, calibration basis, scan direction, surface condition, and reporting requirement.

Can PH 13-8Mo replace 17-4PH?

Not without engineering approval. PH 13-8Mo often emphasizes premium melt quality, fracture toughness, transverse performance, and SCC resistance. 17-4PH generally offers broader availability and lower sourcing complexity.

Send Us a PH 13-8Mo RFQ We Can Review Properly

When you send DAXUN the product form, standard and revision, condition, dimensions, quantity, drawing, test orientation and location, NDT acceptance level, certificate requirement, application, destination, and required date, we can discuss a technically meaningful quotation.

For a large plate or forging, please include the finished-part outline and load direction. Those details often decide whether rolled plate, forged block, or a custom forging is the sound starting route.

Technical Sources

Accuracy note: Standard editions, producer capabilities, dimensional ranges, heat-treatment requirements, and acceptance values can change. The signed purchase order, approved drawing, applicable standard edition, and final MTC govern each delivery. This article does not constitute design approval or completed-component certification.

PH 13-8Mo Plate, Forgings & Round Bar | DAXUN