ASTM A480 Standard Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip

Get Certified ASTM A480 Compliance for Flat-Rolled Stainless Steel 

ASTM A480 provides the general requirements for flat-rolled stainless and heat-resisting steel products, and certification ensures they are produced in compliance with this standard. The certified testing process determines the chemical composition, mechanical properties, and any special test requirements, which are necessary to ensure that the product meets the specification. Testing and certification ensure compliance with ASTM A480 requirements and help to reduce the risk of poor-quality stainless steel products entering critical applications. Select a competent testing laboratory that is ISO/IEC 17025 accredited to ensure your stainless steel plate, sheet, and strip satisfy the general requirements specified. 

The scope of  ASTM A480 includes:

• Material type: Flat-rolled stainless and heat-resistant steel plate, sheet, and strip.
• Purpose: This applies to a variety of individual product specifications.
• Properties evaluated: Chemical composition, mechanical properties (tension, hardness, bend), and special test requirements (intergranular corrosion, permeability, Charpy impact, intermetallic phases).
• Testing method: Heat and product analyses, tension tests, hardness tests, bend tests, and special tests as specified  
• Result: verification of the chemical composition, mechanical properties, and special test requirements to meet specification requirements.
• Test Limitations: If, in the event of any conflict, a requirement of the product specification takes precedence over a requirement of this specification, then the product specification shall take precedence.
• Use Conditions: This specification and applicable material specifications are given in inch-pound and SI units. The material shall be furnished in inch-pound units (unless the order indicates otherwise by the designation “M”).
• Applications: Pressure vessels, general applications, and other applications where flat-rolled stainless and heat-resisting steel products are needed.

What are the Uses of ASTM A480 Specification?

ASTM A480 testing is used to certify flat-rolled stainless and heat-resisting steel products against the general requirements for chemical composition and mechanical properties. Engineers then interpret the results to determine the acceptability of the product for specific uses. This standard-

• Checks heat and product analyses to ensure they meet required chemical specifications.
• Normalizes the test to guarantee uniformity of results from product to product, lab to lab, and production batch to production batch.
• Assists in determining information about products that satisfy certain mechanical testing criteria.
• Enables monitoring of consistency of chemical composition and mechanical properties.
• Backs up material specifications with quantifiable data suitable for technical documentation.
• Assists in determining the test specifications for different product applications.
• Helps arrange facilities and staff related to stainless steel testing.

What Materials Can Be Tested Under ASTM A480? 

ASTM A480 covers flat-rolled stainless and heat-resisting steel plate, sheet, and strip. The standard covers the austenitic, ferritic, martensitic, and duplex stainless steel grades. The appropriate requirements are selected based upon the material grade, product form, and product specification. 

Why is ASTM A1034 Important? 

ASTM A480 is a uniform, standardized specification that ensures consistent, comparable stainless steel quality from manufacturer to manufacturer. The specification sets out general requirements for chemical composition, mechanical properties, and special tests common to several product specifications. If there is a conflict between a requirement of a product specification and a requirement of this specification, the requirement of the product specification shall be qualified as overriding. Test results can verify product quality, help choose the right materials for a given application, and ensure good performance in challenging conditions for the manufacturer and the engineer. The standard also includes dimensional tolerances that are critical for fit-up and fabrication. 

ASTM A480 Testing Process and Data Collection

Technicians perform all testing after preparing specimens from flat-rolled stainless steel. The technician conducts heat analysis and product analysis to confirm chemical composition. The technician conducts tension, hardness, and bend tests per ASTM A370 standards. When appropriate, the technician performs special tests such as intergranular corrosion tests, permeability tests, Charpy impact tests, and tests for harmful intermetallic phases. The lab then records the test results and compares them to the requirements. The technicians enter the chemical composition, mechanical properties, special test results, specimen identification, and test conditions. 

Common Challenges and Troubleshooting

Prepare the specimen correctly; otherwise, poor preparation leads to incorrect measured properties. If there are conflicts between any requirement of a product specification and any requirements of this specification, the former take precedence. The standard also addresses “finish types” that confuse specifiers; several newer finishes with completely different looks are marketed as ASTM A480 No. 6 but are not similar to the original finish. In the laboratory, the problems are solved by using a suitable requirement in accordance with product specification and material grade, and by using the correct test equipment, which is suitably calibrated, and the specimen is suitably prepared. 

• The laboratory reports the heat and product analyses, which are required to meet the chemical requirements of each of the specific elements.
• The technician shows the tension test results that confirm mechanical property requirements. The range of strain rate between yield and fracture is 1/8 to 1/2 in./in./min.
• The inspector records test results for hardness to satisfy requirements for the material. Grip ends of a tension specimen can be subjected to Brinell hardness tests and/or Rockwell hardness tests.
• The engineer takes bend test results, confirming formability. Material up to 3/8″ [9.5 mm] bends over 1 × thickness (1T); to 1 in. bends over 2 × thickness (2T).
• Engineers analyze the results recorded and compare them to the acceptance criteria as defined by the cognizant engineering organization.

FAQs

What specific tests are required for duplex stainless steels under A480? 

If none of the tests for detrimental intermetallic phases (Method A, Method B, or Method C of Test Methods A923) are requested on the purchase order, they are not required . Unless otherwise indicated, it is expected that all duplex types listed in A923 would pass these tests; however, they do not have to be actually run.

What is the specific thickness limit for intergranular corrosion testing of 300 series stainless steels? 

Chromium-nickel (300 series) all flat-rolled products up to and including 2” in thickness. The nominal size of 50.8 mm should be able to pass the intergranular corrosion test after shipping. For heavier plates of certain types, the applicability of this test is a matter for negotiation.

What is the current revision being made to SI unit conversions in A480? 

ASTM Work Item WK95532 is making corrections to the parenthetical SI (metric) unit conversions in the parenthetical column in Annex A2, dimensional tolerances. The intent is to adjust SI values to ensure uniformity of significant figures, but such adjustments are for information only.

Link to ASTM A480