Procurement standard brief
ASTM A182/A182M: Forged Stainless Steel Flanges, Fittings and Valve Parts
Use ASTM A182/A182M for covered forged or rolled stainless and alloy pressure-piping components, then state the F grade, component type, size, pressure class, dimensional standard, facing, bore, heat treatment, examination, traceability, and project restrictions. A182 is primarily the material specification; it does not replace ASME B16.5 dimensions and ratings, a valve or fitting design standard, or the piping code. A forged blank certificate also does not release a machined flange or valve part.
- Use this guide for
- Forged flange and pressure-component material specification
- Relevant to
- Flange, valve, forged fitting, EPC, piping-class, and inspection buyers
Contract responsibility
Scope and Explicit Exclusions
What this material standard controls
Forged component material
A182/A182M establishes covered forged or rolled alloy and stainless material grades for flanges, forged fittings, valves, and parts, with heat treatment, mechanical properties, hardness, testing, repair, marking, and certification provisions.
F-grade condition
The exact F grade, product form, heat-treatment route, size, and component type determine the material basis. Buyers must state any additional chemistry, ferrite, hardness, corrosion test, or repair restriction required by the project.
Material traceability and release
The contract edition supplies a material identification framework. The purchase order adds forging-to-component traceability, machining records, PMI, NDE, dimensions, source witness, and final dossier expectations.
What it does not control alone
- A182/A182M does not by itself define flange NPS, pressure class, type, facing, dimensions, tolerances, bore, bolt pattern, gasket interface, or pressure-temperature rating; ASME B16.5 or another named standard performs those roles.
- It does not establish valve design, forged-fitting geometry, piping-system design, component pressure rating, welding qualification, assembly examination, or completed-system testing.
- A certified forging or bar does not certify final machining, thread, sealing face, weld overlay, NDE after machining, cleanliness, or dimensional conformity of the delivered component.
Specification stack
Related Standards and Responsibility Chain
| Document | Procurement role | Boundary |
|---|---|---|
| ASTM A182/A182M | Defines the covered forged or rolled stainless component material, F grades, heat treatment, mechanical and hardness tests, repair, marking, and certification framework. | The purchase order selects the grade, component form, condition, tests, and restrictions from the contract edition. |
| ASME B16.5 | Defines dimensions, classes, flange types, facings, tolerances, marking, testing framework, and pressure-temperature ratings for covered flange sizes. | B16.5 does not replace the separately ordered A182 material grade, heat treatment, or project NDE requirements. |
| Valve, fitting, or component design standard | Provides geometry, rating, wall, interfaces, and product testing for the delivered component family. | The exact design standard and edition must match the item; one flange standard cannot govern every forged part. |
| Piping code and project class | Control material use, design conditions, corrosion allowance, joints, examination, fabrication, system testing, and project documentation. | Material and dimensional conformity are inputs to, not substitutes for, system approval. |
Line-item completeness
How to Order to This Standard
| Field | What to state | Why it matters |
|---|---|---|
| Material standard | Name ASTM A182/A182M revision, F grade, component type, heat-treatment condition, and project supplements. | Prevents a generic 316 flange request from concealing the actual forging material basis. |
| Component standard | State ASME B16.5 or the applicable valve, fitting, or drawing standard and adopted edition. | Separates material properties from dimensions, ratings, geometry, and component tests. |
| Size and class | Give NPS or drawing size, pressure class, flange or fitting type, bore or schedule match, and dimensional units. | Class, bore, and component geometry control piping compatibility and machining. |
| Facing and ends | Specify raised face, flat face, ring-joint facing, surface-finish range or project criterion, end preparation, and protective covers. | Gasket interface and weld fit-up are functional acceptance items. |
| Manufacture and repair | Define forging route restrictions, heat treatment, weld repair permission or prohibition, repair procedure, and re-examination. | Manufacturing history and repair can affect project qualification and traceability. |
| Examination | List mechanical tests, hardness, PMI, UT, surface NDE, corrosion testing where required, sampling, witness, and acceptance criteria. | Additional examination must be tied to the correct forging and machining stage. |
| Traceability and documents | Require heat, forging, and component identity, material certificate, heat-treatment record, NDE reports, dimensional report, marking, and dossier index. | Machining and lot consolidation must not separate the component from source evidence. |
| Quantity and packing | State piece quantity, matching sets if any, tags, sealing-face and bevel protection, crates, destination, release status, and requested schedule. | Precision faces and markings need protection through export and site storage. |
Copy structure, replace values
Purchase Description Example
Pre-award review
Ordering Mistakes and Corrections
| Mistake | Likely consequence | Correction |
|---|---|---|
| Ordering an "A182 flange" without ASME B16.5 data. | Material may be identified while NPS, class, type, facing, bore, bolt pattern, dimensions, rating framework, and marking remain undefined. | Name both the material and dimensional standards, with F grade, size, class, type, facing, bore, and adopted editions. |
| Using 316L instead of the required F-grade designation. | The order can blur flat product, bar, casting, and forging routes even though the delivered component requires a specific forging material specification. | Use the complete ASTM A182 F grade on the RFQ, purchase order, marking, certificate, and receiving inspection. |
| Assuming a forging certificate covers final machining. | Facing finish, bore, bolt holes, dimensions, NDE after machining, cleanliness, damage, and marking can still fail the component requirements. | Require stage-specific records and a final dimensional, visual, NDE, and marking release tied to the original forging. |
| Leaving repair and re-examination rules unstated. | Supplier practice may not match the piping class or owner quality requirements, and the needed records may be unavailable at final inspection. | State whether repair is prohibited or controlled, the approval path, procedure, heat treatment, NDE, marking, and document requirements. |
Continue the specification
Products, Grades, Applications, and Adjacent Standards
Product forms
Grade datasheets
Adjacent standards
Application briefs
Surface guidance
Buyer questions
Frequently Asked Questions
Does ASTM A182 define stainless flange dimensions?
No. A182/A182M primarily defines the forged material. A flange order normally adds ASME B16.5 or another approved dimensional standard, NPS, class, type, facing, bore, marking, examination, and project requirements.
Why is the grade written F316L instead of only 316L?
The F designation identifies the forging material grade under A182/A182M. Using the complete designation helps distinguish forged component material from flat product, pipe, bar, fitting, or casting specifications.
What documents should accompany an A182 flange?
The project may require the material certificate, heat-treatment record, heat-to-piece traceability, PMI, NDE, dimensional and facing inspection, repair records, marking verification, deviation approvals, packing list, and indexed release dossier.
Published by Tsingshan (Shandong) Iron & Steel Co., Ltd..Sources, update policy and technical limitations.
Quotation package
What to Include in the RFQ
- ASTM A182/A182M, dimensional standard, and piping-class editions
- F grade, component type, heat treatment, and repair restrictions
- NPS or drawing size, pressure class, flange or fitting type, and bore
- Facing, finish criterion, gasket interface, ends, and protective covers
- Forging and machining route plus any weld overlay or special processing
- Hardness, PMI, UT, surface NDE, corrosion test, witness, and acceptance scope
- Certificate, heat treatment, heat-to-piece traceability, dimensions, marking, and dossier
- Piece quantity, matching requirements, crate protection, destination, and requested schedule
Quote request
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