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FOR INTERNAL REFERENCE ONLYDesignation: A/AM – 12 Standard Specification for Castings, Iron-Chromium-Nickel-Molybdenum Co. Heat treatment can modify the corrosion resistance of stainless steels. Thus, the corrosion behavior of ASTM A/A M GR 5A super duplex. The Duplex Stainless classification includes the following ASTM standards; ASTM A and ASTM A

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A valve company took exception, and indicated that duplex valve bodies and bonnets would be supplied per ASTM A What is the difference between these specifications?

As such, many piping specifications include references to ASTM A and its various duplex grades for piping components such as valves.

ASTM A lists tensile property requirements, but does not require that the tensile tests actually be performed. Tensile tests are only required if Supplementary Requirement S32 is specified on the purchase order.

In order to obtain a test report showing the actual chemistry and tensile test results, Supplementary Requirement S12 must also be imposed.


Marking of heat numbers on castings is not required unless specified separately on the purchase order. Any casting a8890 meets A also meets A However, A imposes some additional requirements:.

Duplex Stainless Steels │ Alloy Guide │ MetalTek

ASTM A was reapproved without changes in ashm However, one thing is clear-materials are not added in these codes unless the parent specification requires tensile testing to ensure that the product q890 supplied actually meets the minimum mechanical properties upon which the design is based.

For this reason alone, many specifications that don’t require actual tensile testing are not represented in these codes. A grades will not be added for the same reason. Looking for a career in the Valve Industry?

Duplex Stainless Steels

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However, A imposes some additional requirements: A provides a definition for major weld repairs and requires post-weld heat treatment i. A only requires post-weld heat treatment if Supplementary Requirement S33 is imposed on the purchase order.

Duplex Stainless Steel Investment Casting Compositions – Wisconsin Precision Casting

A imposes several other requirements that are not included in A nor A Each heat of atsm must be tensile tested. Each casting must be hydrostatically tested.

Each casting must be marked with a heat number or with a serial number traceable to a heat number. Certification must be provided listing the chemical analysis of the heat and the mechanical property test results.

The material may be adopted in ASME codes for specific products or applications, including: Latest Post Popular Links Events.

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