Inconel 600 Tube and Pipe: How to Specify ASTM B163, B167, B516, or B517

An Alloy 600 inquiry often begins with one line: “Inconel 600 tube, 25 mm OD.” That is enough to identify a family of products, but it is not enough to manufacture or compare quotations. The missing decisions are usually the ones that change the result: seamless or welded construction, tube or pipe dimensional basis, average or minimum wall, heat-treatment condition, test route, service environment, and the document that will govern acceptance.

DAXUN manufactures Inconel 600 tube and pipe and performs the agreed cold working, heat treatment, sizing, straightening, cutting, surface finishing, inspection, cleaning, and packaging within its production system. We supply finished tubular material against a written specification rather than treating “Inconel 600” as a complete purchase description.

DAXUN Alloy 600 Tubular Manufacturing Scope

Item	Manufacturing and supply scope
Matériau	Nickel-chromium-iron alloy UNS N06600, commonly called Alloy 600 or Inconel 600
Product forms	Seamless tube, seamless pipe, welded heat-exchanger tube, and welded pipe where the ordered standard and dimensions apply
Principal ASTM routes	ASTM B163-22, ASTM B167-23, ASTM B516-24, and ASTM B517-25
Aerospace route	AMS5580M seamless annealed tubing when that specification is invoked and the ordered size is within its scope
Condition	The condition required by the selected standard, drawing, and purchase order; “annealed” or “cold drawn” must not be assumed from the grade name
Dimensional definition	OD and wall for tube, or the specified pipe dimensional basis; average-wall and minimum-wall orders are kept distinct
Processing	Sizing, straightening, cut length, end preparation, agreed surface condition, cleaning, and project packaging
Inspection	Chemistry and mechanical records, dimensions, visual/surface checks, and the hydrostatic, pneumatic, eddy-current, ultrasonic, or other NDE route required by the contract
Documentation	Mill test certificate, heat/lot traceability, inspection reports, NDE or pressure-test records when required, packing list, and agreed third-party or customer witness records

This scope does not imply that every construction route, size, test, or code qualification is available under every standard. The written quotation must confirm the exact combination.

What Is Inconel 600 Tubing?

Alloy 600 is a solid-solution nickel-chromium-iron alloy identified as UNS N06600. Its high nickel content supports resistance in many reducing environments, while chromium contributes oxidation resistance. The alloy also retains useful strength at elevated temperature and is manufactured in several tubular conditions. Those general characteristics explain why it appears in chemical equipment, heat-treatment equipment, heat exchangers, process piping, and specialized high-temperature systems.^[6]

The material name does not establish suitability for a particular fluid or furnace atmosphere. Sulfur compounds, carbon activity, oxygen potential, chlorides, molten salts, metal temperature, stress, and time can change the controlling damage mechanism. A pressure-design code, equipment drawing, or owner specification may add requirements that do not appear in a basic material certificate.

Producer reference composition

Special Metals publishes the following limiting composition for INCONEL alloy 600.^[6]

Élément	Limiting composition, wt.%
Nickel plus cobalt	72.0 minimum
Chrome	14.0-17.0
Iron	6.0-10.0
Carbone	0.15 maximum
Manganèse	1.00 maximum
Silicium	0.50 maximum
Cuivre	0.50 maximum
Soufre	0.015 maximum

These values identify the Alloy 600 material family. Contract chemistry acceptance follows the ordered ASTM, AMS, ASME, or customer specification and its stated edition. The producer also reports a density of approximately 8.47 g/cm3, but physical-property references do not replace the dimensional, mechanical, or test requirements of the tubular-product standard.^[6]

Which ASTM Standard Applies to Alloy 600 Tube or Pipe?

The correct standard follows the component function and manufacturing route, not the word “tube” or “pipe” by itself. The four common routes solve different purchasing problems.

Standard	Product and manufacturing route	Appropriate buying question	Common specification error
ASTM B163-22	Seamless nickel and nickel-alloy condenser and heat-exchanger tubes; UNS N06600 is among the listed grades	Is this a seamless OD-controlled tube for condenser, evaporator, or heat-exchanger service?	Calling it a welded-tube standard
ASTM B167-23	Seamless nickel-chromium-aluminum and nickel-chromium-iron alloy pipe and tube for general corrosion- and heat-resistant applications	Is the order for seamless general-service pipe or tube rather than a dedicated exchanger-tube route?	Assuming B167 covers welded construction
ASTM B516-24	Welded nickel-chromium-iron alloy boiler, heat-exchanger, and condenser tubes	Is a welded exchanger tube acceptable under the design and customer specification?	Treating it as welded process pipe
ASTM B517-25	Welded nickel-chromium-iron alloy pipe for general corrosive and heat-resistant applications	Is the requirement welded pipe rather than welded exchanger tubing?	Using B517 for every welded tubular product

ASTM B516 is not simply a lower-cost version of B163. B516 controls a welded exchanger-tube route that includes automatic welding without filler, postweld cold work, final annealing, and specified examination and testing.^[3] ASTM B517 addresses welded, cold-worked, annealed pipe.^[4] The two standards are not interchangeable merely because both products contain a longitudinal weld.

Likewise, ASTM B163 and B167 overlap in alloy and seamless construction but not in purchasing purpose. B163 is centered on condenser and heat-exchanger tubing; B167 is a broader seamless pipe-and-tube route for corrosion- and heat-resistant applications.^[1][2]

State the edition in the purchase order

This page has verified ASTM B163-22, B167-23, B516-24, and B517-25 against the official ASTM pages. A project drawing, pressure code, legacy qualification, or customer specification may require a particular revision. “Latest ASTM” is not a complete contractual instruction; write the approved edition into the purchase order.

Tube and Pipe Are Related, but the Order Language Is Different

Tube is commonly purchased by actual outside diameter and wall thickness because OD, wall, bore, and heat-transfer area are functional dimensions. Pipe is commonly tied to a nominal pipe-size and schedule or to another specified pipe dimensional basis. The vocabulary is useful, but it does not override the product standard.

A sound order states the actual controlling dimensions rather than relying on a label. For example:

• tube: 25.40 mm OD x 1.65 mm minimum wall x 6,000 mm long;
• pipe: the named nominal-size/schedule or OD/wall basis required by the design;
• tolerances: the applicable standard plus any tighter drawing limits;
• wall basis: average wall and minimum wall identified explicitly;
• ends: plain, square cut, beveled, orbital-weld preparation, or another drawing-defined finish.

Minimum-wall and average-wall tubes with the same nominal wall callout do not represent the same metal distribution or purchasing requirement. A quotation cannot be compared correctly until that basis is fixed.

When Does AMS5580M Apply?

AMS5580M is a separate aerospace-material procurement route for annealed, corrosion- and heat-resistant seamless nickel-alloy tubing. Its published scope covers nominal outside diameters up to and including 9.250 in. (234.95 mm).^[5]

An AMS5580M order should not be converted silently to ASTM B167 or B163. The alloy family may be the same, but the specification basis, testing, reporting, dimensional rules, and customer approval route may differ. Conversely, an AMS material certificate does not by itself establish design approval, approved-source status, finished-part conformity, or release under an aerospace program.

Condition Changes Both Properties and Fabrication

Alloy 600 tube and pipe can be supplied in hot-finished, annealed, cold-drawn, or other specification-defined conditions. Cold work can raise strength while reducing ductility; annealing changes the mechanical response, grain structure, forming behavior, and sometimes the surface condition. Size also affects the applicable mechanical requirements.

That is why a single online table cannot serve as the acceptance table for every Alloy 600 tube and pipe. Special Metals publishes composite and typical values by form and condition and explicitly warns that typical values are not specification values.^[6] Contract acceptance must use the ordered tubular standard, size range, condition, and any customer supplement.

For fabrication, this distinction is practical:

• a tube intended for severe expansion, bending, or flaring may need a different condition from a straight pressure line;
• a cold-worked strength level may be altered by subsequent welding or heat exposure;
• a final anneal may affect scale, oxide, cleanliness, and dimensional control;
• a pressure or elevated-temperature design must use approved design properties, not room-temperature catalog values.

Where Alloy 600 Tube and Pipe Fit Well, and Where Review Is Essential

Alloy 600 is valuable because it balances high nickel, chromium-assisted oxidation resistance, fabricability, and elevated-temperature capability. It is not immune to every high-temperature or corrosive mechanism.

Heat-treatment and furnace equipment

Alloy 600 has a long record in furnace components, muffles, retorts, and atmosphere-containing equipment.^[6] For tubular parts, the metal temperature, external load, internal or external pressure, atmosphere composition, dew point, sulfur contamination, carbon activity, and thermal cycling all matter. A controller setpoint is not the same as the hottest tube-wall temperature.

Sulfur-bearing reducing atmospheres deserve particular caution with nickel-rich alloys. Carburization, nitriding, oxidation, and sulfidation are distinct mechanisms; a ranking produced under one laboratory atmosphere cannot be transferred automatically to another. Comparative producer data show that alloy rankings change with gas composition, temperature, and exposure method.^[7]

Chemical and process equipment

Alloy 600 is used in equipment handling various organic and inorganic media, but the process stream must be defined. Concentration, temperature, aeration, oxidizing contaminants, chlorides, deposits, shutdown conditions, and residual stress can change the corrosion mode. “Corrosion resistant” is not an acceptance criterion and should not replace a documented materials review.

Condensers and heat exchangers

For exchangers, the first decision is often B163 seamless tube versus B516 welded tube. The design authority must also define tube-to-tubesheet joining, expansion or welding, cleaning method, allowable surface condition, NDE, leak testing, and any water-chemistry or fouling risks. A tube that passes its mill test can still fail if the expansion, weld, cleaning, or operating chemistry is wrong.

Aerospace and nuclear work

AMS5580M may be appropriate for an aerospace tubing procurement route. Nuclear or safety-related service may invoke additional code cases, approved sources, quality-assurance programs, examinations, records, and customer approvals. An ASTM or AMS MTC alone does not establish those project qualifications.

Seamless or Welded: What Actually Changes?

The choice is not simply “seamless is strong, welded is cheap.” Both can be technically sound when the correct standard, manufacturing controls, design basis, and inspection plan are applied.

Decision variable	Seamless route	Welded route
Starting construction	Pierced/extruded and cold- or hot-worked tubular product	Formed strip or plate with a longitudinal weld, followed by the specification-defined processing
Relevant routes on this page	B163, B167, AMS5580M	B516, B517
Key manufacturing concern	Eccentricity, surface discontinuities, cold-work and heat-treatment uniformity	Weld continuity, weld-zone processing, filler restriction where applicable, final heat treatment, and full-length examination
Design question	Does the selected seamless standard and condition meet the component requirements?	Is welded construction permitted by the design, code, owner, and service environment?
Acceptance	Standard-specific dimensions, mechanical tests, pressure/NDE route, surface, and documents	The same categories plus the weld-route controls required by the selected standard

Do not ask a supplier to quote “seamless or welded, whichever is cheaper” when the drawing or owner specification has not approved both. That turns an engineering decision into a commercial substitution.

Failure Modes That a Material Certificate Cannot Prevent

Observed problem	Likely cause chain	What to verify
Tube leak after fabrication	Excessive expansion, poor orbital or manual weld control, local thinning, or an undetected discontinuity	Expansion record, weld map, WPS/PQR, operator qualification, NDE and leak test
Premature furnace-tube cracking	Thermal gradients, restraint, sulfur contamination, carburization/nitriding, or creep-fatigue interaction	Actual metal temperature, gas analysis, cycle history, supports, hardness/metallography and crack location
Wall loss or pitting in process service	Unspecified contaminants, deposits, oxidizing species, chlorides, concentration changes, or shutdown exposure	Full stream chemistry, deposit analysis, temperature profile and corrosion morphology
Distortion or sagging	Sustained stress at temperature, inadequate support, pressure differential, or use of room-temperature strength in design	Hot-load calculation, approved elevated-temperature properties, wall survey and support drawing
Weld-zone attack	Wrong filler or procedure, heat tint/scale, sensitized or contaminated surface, or dissimilar-metal effects	Procedure, filler traceability, shielding, cleaning, surface examination and service chemistry
Certification dispute	Grade name used instead of the governing product standard, edition, condition, or wall basis	Purchase order, MTC, heat/lot link, dimensions, test reports and deviation approvals

The useful lesson is simple: traceability answers “what material was supplied”; it does not answer “was the component correctly designed, fabricated, and operated?”

How DAXUN Controls an Alloy 600 Tube or Pipe Order

1. Review the product route. We confirm whether the inquiry belongs under B163, B167, B516, B517, AMS5580M, or a customer specification.
2. Freeze the dimensional basis. OD or nominal pipe size, wall basis, tolerance, length, straightness, and ends are stated before manufacturing.
3. Confirm material condition and processing. The required working and annealing route is tied to the standard and drawing.
4. Maintain heat and production-lot traceability. Material records remain linked through tube manufacture, processing, cutting, inspection, and packing.
5. Perform the specified inspection. Dimensional, visual, mechanical, pressure, leak, and NDE requirements are applied as written in the order.
6. Review the document set. MTCs, NDE reports, test records, deviation approvals, and packing identification are checked against the purchase order.

Customer witness or independent third-party inspection can be included when stated in the inquiry. It is an additional verification layer; it does not replace DAXUN’s manufacturing records.

What Should Be on the MTC and Inspection Plan?

At minimum, the documentation review should connect the delivered tubes or pipes to:

• manufacturer, material designation, UNS number, and ordered standard/edition;
• heat number and, where used, production or test lot;
• reported chemical analysis and applicable mechanical results;
• product form, manufacturing route, condition, and dimensions;
• pressure-test or NDE method, coverage, acceptance basis, and result when required;
• heat-treatment statement or record required by the specification;
• quantity, lengths, marking, and any approved deviations.

Positive material identification can be added when the contract requires it, but handheld XRF does not verify carbon or every light element and does not replace the certified chemical methods required by the product standard. PMI should be treated as an identity check with a defined procedure, not as a complete MTC substitute.

What Determines Inconel 600 Tube Price?

A credible price needs more than diameter and quantity. The largest variables are:

• B163, B167, B516, B517, AMS5580M, or customer specification;
• seamless or welded construction;
• OD/NPS, average or minimum wall, tolerances, and length;
• annealed, cold-worked, or other specified condition;
• surface, straightness, end finish, cleaning, and packaging;
• pressure testing, eddy-current/ultrasonic examination, additional sampling, or third-party witness;
• documentation, project approval, and delivery schedule.

An online price per kilogram can be useful for an early budget, but it cannot price the manufacturing yield, test burden, documentation, and rejection risk of a finished tubular order.

RFQ Checklist for Inconel 600 Tube or Pipe

Send these items for a technically reviewable quotation:

1. Material name and UNS number: Alloy 600 / UNS N06600.
2. Product standard and required edition.
3. Seamless or welded construction.
4. Tube OD or pipe dimensional basis.
5. Average wall or minimum wall, with tolerance.
6. Condition and any required heat-treatment statement.
7. Length, quantity, straightness, ends, and surface condition.
8. Design code, equipment drawing, and owner specification when applicable.
9. Fluid or furnace atmosphere, concentration, contaminants, pressure, and maximum metal temperature.
10. Required NDE, pressure/leak test, mechanical testing, and witness points.
11. MTC format, traceability, marking, packing, destination, and delivery requirement.

If the order replaces a failed tube, include the failure location, operating history, photographs, wall-thickness map, deposits or gas chemistry, and the previous material certificate. Those records are more useful than asking for a nominally “better” alloy without identifying the mechanism.

Questions fréquemment posées

Is ASTM B163 the same as ASTM B167 for Inconel 600 tube?

No. Both can cover seamless UNS N06600 tubular products, but B163 is directed to condenser and heat-exchanger tubes, while B167 covers seamless pipe and tube for general corrosion- and heat-resistant applications.^[1][2] Use the route invoked by the design and purchase order.

Which standard covers welded Alloy 600 heat-exchanger tube?

ASTM B516-24 is the welded boiler, heat-exchanger, and condenser-tube route discussed on this page.^[3] Welded general-service pipe is addressed separately by ASTM B517-25.^[4]

Is Inconel 600 pipe always seamless?

No. ASTM B167 covers seamless pipe and tube, while ASTM B517 covers welded pipe. The construction must be written into the inquiry; the words “Alloy 600 pipe” do not establish it.

Can B516 welded tube replace B163 seamless tube?

Only when the equipment design, governing code, customer specification, and responsible engineering authority permit the substitution. Equivalent alloy chemistry does not make the manufacturing routes contractually interchangeable.

Does an Alloy 600 MTC prove furnace suitability?

No. The MTC supports material and product-standard traceability. Furnace suitability also depends on actual metal temperature, atmosphere chemistry, stress, cycling, design, welding, and inspection.

What is the difference between Alloy 600 and Inconel 600?

UNS N06600 identifies the alloy. “INCONEL” is a Special Metals trademark; “Alloy 600” is the common generic purchasing name. The purchase order should use the UNS number and governing specification so the acceptance basis is unambiguous.

Technical Accuracy Statement

This page distinguishes ASTM/AMS tubular-product requirements from producer reference data and finished-component approval. Published compositions, properties, and application examples are not universal design allowables or service-life guarantees. Final material selection, pressure design, elevated-temperature assessment, welding procedure, examination, and acceptance criteria must follow the governing code, approved drawing, service conditions, and responsible engineering authority.

Last reviewed: August 9, 2026

Technical Sources

1. ASTM B163-22, Standard Specification for Seamless Nickel and Nickel Alloy Condenser and Heat-Exchanger Tubes
2. ASTM B167-23, Standard Specification for Nickel-Chromium-Aluminum Alloys and Nickel-Chromium-Iron Alloys Seamless Pipe and Tube
3. ASTM B516-24, Standard Specification for Welded Nickel-Chromium-Iron Alloy Boiler, Heat Exchanger, and Condenser Tubes
4. ASTM B517-25, Standard Specification for Welded Nickel-Chromium-Iron-Alloy Pipe
5. SAE AMS5580M, Nickel Alloy, Corrosion and Heat-Resistant, Seamless Tubing, 74Ni-15.5Cr-8.0Fe, Annealed
6. Special Metals, INCONEL Alloy 600 Technical Bulletin
7. Haynes International, Carburization, Nitriding and Chloride-Salt Resistance of High-Temperature Alloys