Direct answer: Inconel 690 strip and coil should be ordered as UNS N06690 flat product with a defined final condition, product standard, edge and shape requirements, and coil dimensions matched to the buyer’s equipment. ASTM B168-26 and applicable B906-22 requirements establish the material framework; they do not replace an agreed slit-coil acceptance plan. Confirm the drawing, inspection basis and traceability before production.[1][2]
DAXUN / TECHNICAL PROCUREMENT
Define the delivered feedstock so the material, processing and receiving teams can accept the same product.
A coil can carry the correct heat number and still be unsuitable for a particular feed line. It may have the wrong inside diameter, an unapproved joint, an edge that needs further preparation, or a final condition different from the material used to qualify the forming operation. Those are purchase-order decisions, not details to settle after the shipment arrives.
DAXUN manufactures Alloy 690 strip and coil and performs the agreed processing in-house. We review the material requirement together with the downstream operation, then confirm the manufacturing route, inspection records and delivery configuration in writing. Minimum gauge, maximum width, coil mass, special edge capability and delivery time require project-specific confirmation; a generic alloy description is not a capacity commitment.
Start with the product you will actually feed into the process
Specify the flat product and its final condition before describing the delivery as a coil. A coil is a wound configuration, not another alloy designation or an automatic definition of strip. Commercial terms such as narrow coil, slit strip and cut-length strip still need to be connected to the ordered specification and dimensions.[1][2]
This guide concerns flat feedstock for drawing-defined fabrication. It does not cover coiled tubing. Buyers needing broad flat-product selection can consult the Inconel 690 sheet and plate guide; buyers specifying tubing need the separate 690 tube and pipe route. Neither a tube specification nor a plate property table becomes suitable for strip simply because the same alloy name appears on the quotation.
For a repeat part, send the approved material callout and the existing incoming-inspection requirements. For a new part, identify which manufacturing operation controls the feedstock: continuous forming, stamping, cutting, joining or another defined process. Describe the actual concern—tracking, cracking at an edge, surface marks or inconsistent springback—rather than requesting an undefined “precision” grade of coil.
The buyer and producer should also resolve the product definition under the controlled contractual edition. There is no useful universal width cutoff to invent for every national standard, commercial catalogue and order. What matters is that both parties select the same product-form and dimensional requirements before agreeing a price.
Assign the standards the right jobs
Use ASTM B168 for the applicable alloy and flat-product route, with B906 supplying applicable general requirements. B906 is not an alternative alloy specification reserved for coils. The public B168-26 scope includes rolled N06690 plate, sheet and strip.[1][2]
| Order element | What it controls | What still needs confirmation |
|---|---|---|
| ASTM B168-26 | Applicable N06690 flat-product specification | Ordered form, condition, size-dependent requirements and contractual edition |
| ASTM B906-22 | Applicable general requirements for nickel-alloy flat products | Relevant definitions, tolerances, testing and any agreed supplementary requirements |
| Purchase order and drawing | Intended dimensions, processing needs and delivery details | Clear precedence for conflicting requirements and written resolution of exceptions |
| Approved inspection plan | Who measures what, when and how results are recorded | Lot definition, sampling, hold points and agreed acceptance criteria |
The full controlled standards and the purchase order govern acceptance. The public scope pages are useful for checking responsibility, but they are not substitutes for the current tables needed for a particular size and state. Do not lift one tolerance from a supplier page and apply it across every thickness, edge route and width.
Resolve mixed-unit requirements explicitly. If a drawing uses metric dimensions while the governing specification uses another primary unit system, identify the controlling values and rounding convention. Two rounded equivalents should not create two independent acceptance limits. Record any departure from the normal specification route as an agreed requirement, not an undocumented production adjustment.
Read mechanical data with the final state attached
“Cold rolled” describes a manufacturing operation; it does not, by itself, establish the delivered temper. A cold-rolled strip may receive a subsequent anneal. Conversely, material supplied after additional cold work should not be assumed to behave like the annealed material used during an earlier tool trial.[3][4]
One useful illustration is Special Metals’ reported room-temperature result for 0.150 in (3.81 mm) cold-rolled Alloy 690 strip annealed at 1900°F (1040°C). It shows 0.2% yield strength of 50.5 ksi (348 MPa), tensile strength of 105.0 ksi (724 MPa) and elongation of 41%. These are representative producer test results for that specimen and treatment, not guaranteed properties for every ordered gauge.[3]
| Information type | How to use it | Purchasing mistake to avoid |
|---|---|---|
| Representative producer test result | Understand what a documented material state can look like | Treating a single result as the contractual minimum or maximum |
| Producer-published specification minimum | Identify a possible acceptance basis for its stated form and condition | Assuming an older datasheet verifies every row of the current standard |
| Contract requirement | Set the values, methods and sampling applicable to the order | Leaving the actual product form or final condition unspecified |
| Delivered-lot test result | Check evidence against the agreed acceptance basis | Using an unrelated heat or a test performed before an unrecorded state change |
VDM describes heat-treated/pickled and bright-annealed strip delivery routes. That distinction belongs on the enquiry because final state and finish are separate order attributes. Bright appearance does not define a surface-roughness limit, nor does an annealed label prove the surface protection needed for the customer’s process.[4]
Where forming performance is critical, agree whether a representative production sample or trial is required before the main order is released. State how the sample must represent the ordered material and which observations constitute acceptance. A successful trial on one thickness and final state should not silently qualify a different thickness, edge or condition.
Define the edge that reaches the tool
An edge requirement should name the condition to be inspected and the method used to inspect it. “Burr free” is not a complete measurement instruction. Buyers should specify whether the application needs an as-slit edge, additional edge preparation or a drawing-defined profile, together with a measurable acceptance basis.
Slitting-tool condition, setup and material behaviour can influence burr and lateral shape. Equipment-manufacturer guidance describes these as interacting process variables; it does not supply a universal Alloy 690 knife clearance or acceptance limit.[5] The purchasing task is to define the required result so the producer can confirm an appropriate route.
For a strip that enters a guide or contacts another part, identify the relevant edge and face. A burr on an unrestricted face may have a different consequence from a raised edge at a critical contact. Mark the orientation on the drawing if it matters. If subsequent processing removes the edge, explain the machining allowance instead of buying an unnecessarily different edge condition.
Agree how burr height will be distinguished from waviness, edge rollover or a local dent. The inspection plan can identify the instrument, measuring direction, locations along the coil and treatment of isolated defects. Any numerical limit must come from the controlled requirement and the confirmed process capability; this guide does not supply an arbitrary limit.
Edge preparation can also change the finished width or the region available for measurement. Review those requirements together. A quotation that promises both a final width and a particular edge profile should state when the width is measured and which boundary defines it. Otherwise, the buyer and producer may report different dimensions while believing they followed the same drawing.
Separate camber, coil set and crossbow
Use the name of the shape defect you need to control. Lateral curvature, lengthwise curl and transverse curvature describe different observations; one unspecified “flatness” value will not necessarily resolve all three.
Camber is lateral deviation along the strip. Coil set is the longitudinal curvature associated with the wound material. Crossbow is curvature across the width. Edge wave or a local buckle is another condition again. For procurement, connect the named shape to a sample length and an agreed uncoiled measuring setup, rather than interpreting a photograph as an acceptance test.
| Characteristic | Why the buyer cares | Measurement details to settle |
|---|---|---|
| Camber | Lateral deviation can affect guide clearance and tracking | Gauge length, datum, support and maximum deviation method |
| Coil set | Lengthwise curl affects how uncoiled material is presented | Uncoiling procedure, relaxation and any agreed levelling condition |
| Crossbow | Transverse curvature changes contact with tooling or supports | Sample width, support condition and measuring direction |
| Edge wave/local buckle | Local shape can interfere with handling or part formation | Named defect, assessment length and applicable restrained/unrestrained condition |
| Thickness variation | Local size affects fit and formed geometry | Locations, edge exclusion where applicable, instrument and sampling map |
These are recommended agreement fields, not a claim that every item is mandatory under ASTM. The exact method and limit must match the ordered product and the user’s operation. Inspecting a tightly restrained strip and then comparing it with an unrestrained supplier reading can create a dispute that is really about test conditions.
Tell DAXUN whether the strip will be levelled at your site, and whether acceptance is before or after an agreed levelling step. Do not assume an incoming shape problem can be corrected by guides or line tension. If the downstream equipment changes, review the earlier acceptance basis before placing an identical material order.
Match the coil to the handling and feeding equipment
State the equipment envelope as an order requirement: inside diameter, maximum outside diameter, acceptable mass and any width or loading restrictions. Material conformity does not prove that the package fits a mandrel or can be handled by the receiving installation.
Inside diameter and outside diameter are different constraints. One controls the interface with the coil support; the other can determine clearance. The approved mass must also reflect how the coil is lifted and loaded. The equipment owner should supply the permissible values; DAXUN should confirm the delivery configuration in the quotation.
Specify winding direction when face orientation matters. If a protected face or a marked burr direction must arrive in a particular orientation, use a drawing or simple winding sketch to remove ambiguity. For continuous feeding, address permitted joints, joint marking and whether any joined material must be removed before use. Do not discover a joint policy only after an interruption on the line.
The receiving team also needs an agreed approach to loose wraps, telescoping and transport damage. If these affect acceptance, describe how they will be judged on the secured delivery and after safe opening. Handling must follow the site’s own safe work procedure; an article or supplier photograph is not a coil-opening instruction.
Finally, distinguish ordered metal quantity from the number of packages. Several individually identified coils can share one heat but carry different widths or masses. Confirm acceptable piece distribution if the job depends on a particular uninterrupted length. Do not infer continuous usable length solely from total invoiced mass.
Preserve the identity when a master coil is split
Each delivered slit coil should remain linked to the material and processing records that support its acceptance. A common heat number establishes an important part of that identity, but it does not distinguish all daughter coils or describe the operations performed after the master coil was tested.
DAXUN’s agreed material package can connect the heat, master-coil reference, slit-coil identifier, final condition, inspection record and packing list. The order should define which records are required and how they will be matched. A buyer receiving multiple widths should be able to identify the correct report without assuming every label represents the same finished item.
Review the test lot and the production lot together. If a test predates a subsequent operation, determine whether it remains representative under the specification and inspection plan. This is especially important when an order changes state, size or processing route after the original quotation. Traceability is not improved by attaching more certificates unless each document’s relationship to the delivered product is clear.
For cut lengths made from coil, preserve the parent identity through the cutting and packing stage. If the customer’s own operation divides the delivery further, provide a practical starting identification system rather than expecting a certificate number alone to travel with every part. Record agreed substitutions and deviations before release, so the next purchase can reproduce the accepted requirement.
Do not confuse base strip with a welding consumable
An N06690 base-material certificate does not establish a welding-strip classification. AWS A5.14/A5.14M:2026 covers nickel and nickel-alloy bare electrodes, strip electrodes and rods under a separate consumable specification. A request for overlay strip therefore needs more information than “690 strip.”[6]
Special Metals identifies Filler Metal 52, used in welding Alloy 690, as ERNiCrFe-7 / UNS N06052. That distinction illustrates why the name of the base alloy does not automatically identify the filler. It does not make Filler Metal 52 a universal choice for every strip-cladding process.[7]
If your enquiry concerns welding or cladding, state the required consumable classification, process, any associated flux, deposited-metal requirements and qualification documents. Ask the responsible welding engineer to define the procedure and acceptance route. DAXUN should review that requirement as its own product request, rather than silently substituting commercial B168 base strip.
The same discipline applies to drawing notes that combine multiple standards. A list of familiar standard numbers is not evidence of multiple certifications. Each claimed conformity must have a defined scope and supporting record; any unresolved note should be clarified before the production order is accepted.
Build inspection around the failure you need to prevent
Choose checks that answer the actual acceptance questions, then connect their results to the delivered coils. A certificate can establish material conformity without proving every downstream processing outcome. Equally, a successful feeding trial does not replace the required material evidence.
| Potential failure | Trigger or missing requirement | Agreed verification and release evidence |
|---|---|---|
| Unexpected forming response | Final state differs from the qualified feedstock | State-linked material test certificate, required mechanical results and a representative trial when specified |
| Edge damage or feed interference | Edge profile, burr face or local damage was not defined | Edge inspection using an agreed method and locations; orientation identified where needed |
| Tracking or shape dispute | Camber is confused with another shape defect or measured differently | Named characteristic, sample length and measuring setup recorded with results |
| Coil cannot be loaded | Inside/outside diameter or mass exceeds the supplied equipment envelope | Coil dimensions and mass cross-checked against the approved order |
| Unplanned process interruption | Joint presence or winding condition was not agreed | Declared joint policy, markings and winding checks required by the order |
| Documents cannot identify the delivery | Master-coil identity lost during splitting or packing | Unique coil identifiers matched to the packing list and applicable inspection records |
This matrix is a purchasing aid, not an assertion that one test package fits every order. The inspection plan should identify responsibility for approval, inspection and disposition of nonconforming material. If a deviation can be accepted for a particular part, obtain that decision from the authorized purchaser or design authority and retain it with the order.
For questions about available examination routes, use DAXUN’s testing information as a starting point and request the exact method and reporting scope needed for the project. Do not assume a general service description means a particular test is included, that the laboratory holds a specific accreditation, or that an examination establishes a finished-component qualification.
On arrival, check packaging condition and identifiers before distributing material to production. Record any visible transport damage in a way that preserves the affected coil identity. If a problem appears only during processing, record the coil, position and operating context so the investigation can distinguish a material issue from a change in handling, tooling or the original requirement.
Send DAXUN your drawing, final condition, thickness and width, edge and shape criteria, coil equipment envelope, inspection requirements and delivery destination.
Prepare an RFQ that can become a purchase order
The most useful enquiry provides enough information to define acceptance, not just enough to estimate metal weight. DAXUN reviews those requirements as the manufacturer and confirms the agreed processing and supply scope. Our Inconel material range provides broader product context; the written quotation defines the particular order.
Include the following information:
- Material and specification: UNS N06690, product form, contractual editions and any project or drawing requirements. State whether the request is for base strip or a classified consumable.
- Final condition: specified temper or annealed state, required mechanical evidence, finish and any restrictions on subsequent processing.
- Metal dimensions: decimal thickness and width, cut lengths if applicable, units, controlling tolerances and critical measurement locations.
- Edge and shape: edge profile, burr face where relevant, named shape characteristics and the proposed measuring condition. Attach the acceptance method if already established.
- Coil configuration: inside diameter, maximum outside diameter, mass limits, winding direction, joint policy and required length distribution.
- Inspection and documents: lot definition, material test certificate (MTC), dimensional and edge records, agreed tests, witness points and label/packing-list requirements.
- Use and delivery: downstream process, representative drawing, quantity, packaging requirements and destination. Supply operating conditions when material suitability also needs review.
These fields make alternative quotations easier to compare. Two offers for the same nominal alloy and weight are not equivalent if one includes a verified edge requirement and individually traceable slit coils while the other leaves those details open. Compare the acceptance basis and declared exceptions before comparing the final price.
For repeat orders, identify which requirements are unchanged and provide the current drawing revision. An old invoice may not capture the forming trial, a later edge modification or a one-time deviation accepted on the previous shipment. A brief revision review can prevent the wrong version of a successful order from being reproduced.
Packaging should preserve both the physical edges and the identification system during the agreed transport route. Specify protection for critical faces and edges, permitted contact materials where relevant, and how individual coils should be marked. DAXUN’s packaging service information can support the discussion, but the final packaging arrangement should follow the confirmed order.
Send the drawing and completed requirements through the DAXUN enquiry page. If a limit has not yet been defined, identify the downstream problem and ask for a technical review. An unresolved requirement should remain visible until agreed, rather than being replaced with an unsupported generic tolerance.
Frequently asked purchasing questions
Does ordering Alloy 690 as a coil change its material specification?
No. Winding does not create a different alloy. Identify the actual flat-product form, UNS grade, final condition and applicable B168/B906 requirements, then add the coil-delivery details. Coiled tubing belongs to a different product route; the shared word “coil” is not enough to select the specification.[1][2]
Is cold-rolled Inconel 690 strip always hard?
No. The delivered state depends on the full processing route, including any final heat treatment. Producer literature includes annealed cold-rolled strip. Specify the required final condition and supporting results instead of treating the rolling description as a temper certificate.[3][4]
Can we order “burr-free” strip without a numerical definition?
That phrase leaves room for disagreement. Identify the edge condition, critical face, inspection method and agreed acceptance criterion. The appropriate requirement depends on the part and process; there is no universal burr value established here. Confirm capability against the defined requirement before releasing production.
Are camber and coil set the same problem?
No. Camber describes lateral deviation along the strip, whereas coil set describes lengthwise curl. Crossbow concerns curvature across the width. Name the condition, sample length and measuring setup so the receiving inspection and the producer evaluate the same characteristic.
Does a B168 certificate qualify strip for weld overlay?
Not by itself. Base-material conformity, consumable classification and a qualified welding procedure are different responsibilities. AWS A5.14/A5.14M:2026 covers nickel-alloy strip electrodes; the actual consumable and procedure requirements must be specified for the intended welding or cladding process.[6][7]
Can a standard commercial coil be assumed to be nuclear qualified?
No. A commercial material specification does not establish project approval, a special thermal treatment, or conformity of a finished nuclear component. State the responsible project’s material, manufacturing, inspection and approval requirements separately. DAXUN does not represent ordinary strip certification as evidence of a nuclear qualification.
What information most changes a firm coil quotation?
The final state, thickness and width, edge and shape requirements, coil envelope, length or joint restrictions, inspection package and quantity all affect the scope being quoted. Provide those requirements with the drawing and delivery destination. A nominal alloy name and weight alone cannot define a comparable manufactured product.
Technical Accuracy Statement
This article distinguishes public standard scope, producer-reported material examples and recommended purchasing controls. It does not reproduce the full controlled ASTM acceptance tables or establish universal processing settings. The contractual edition, product form, size, final condition, approved drawing and agreed inspection plan govern each order. Illustrative producer data are not DAXUN guaranteed values, design allowables or proof of finished-part fitness. INCONEL is a trademark of the Special Metals group; use of the alloy name does not imply Special Metals origin for DAXUN-manufactured material.
Last reviewed: September 24, 2026.
Technical Sources
- ASTM International — ASTM B168-26, Standard Specification for Nickel-Chromium-Aluminum Alloys, Nickel-Chromium-Iron Alloys, Nickel-Chromium-Cobalt-Molybdenum Alloy, Nickel-Iron-Chromium-Tungsten Alloy, and Nickel-Chromium-Molybdenum-Copper Alloy Plate, Sheet, and Strip — official scope and current edition.
- ASTM International — ASTM B906-22, Standard Specification for General Requirements for Flat-Rolled Nickel and Nickel Alloys Plate, Sheet, and Strip — official scope.
- Special Metals Corporation — INCONEL alloy 690, SMC-079, October 2009 — representative material data, including Table 5 cold-rolled strip.
- VDM Metals — VDM Alloy 690, Material Data Sheet 4038, February 2021 — material condition and strip delivery information.
- VALGO — Camber and Burr Defects in Slit Coils: Causes and Prevention, September 11, 2026 — equipment-manufacturer process explanation; not an Alloy 690 acceptance specification.
- American Welding Society — AWS A5.14/A5.14M:2026, Specification for Nickel and Nickel-Alloy Bare Welding Electrodes and Rods — official preview including strip-electrode scope.
- Special Metals Welding Products Company — INCONEL Filler Metal 52 — ERNiCrFe-7 / UNS N06052 product bulletin.
