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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It is the responsibility of the purchaser to determine which grade shall be furnished depending on design and service conditions, mechanical properties, and corrosion-resistant characteristics. A valve company took exception, and indicated that duplex valve bodies and bonnets would be supplied per ASTM A Rigging and Lifting of Large Valves Post: Despite Oil Prices Post: The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
ASTM A lists tensile property requirements, but does not require that the tensile tests actually be performed. The material may be adopted in ASME codes for specific products or applications, including: Emerson Completes Acquisition of iSolutions I. Latest Post Popular Links Events. Shale Work Qstm in U. Emerson Completes Acquisition of iSolutions Inc.
ASTM A was reapproved without changes in Zstm for a career in the Valve Industry? Texas Manufacturing Expands Modestly, Outlook. The steel shall conform to the required chemical composition for carbon, manganese, silicon, phosphorus, sulfur, chromium, nickel, molybdenum, copper, tungsten, and nitrogen.
Link to Active This link will always route to the current Active version of the standard. Work Item s – proposed revisions of this standard.
Upcoming Valve Industry Events Reprints. Each casting must be hydrostatically tested. A grades will not be added for the same reason.
Duplex Stainless Steel Investment Casting Compositions – Wisconsin Precision Casting
Admiral Valve Announces Partnership with Diek. ViewIn Technology for Mechanical Seals. A imposes several other requirements that are not included in A nor A 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. However, A imposes some additional requirements: Castings shall be marked for material identification with the specification designation and grade. A provides a definition for major weld repairs and requires post-weld heat treatment i.
However, one thing is clear-materials are not added in these codes unless the parent specification requires tensile testing to ensure that the product being 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.
It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. New Washer Application Search Tool. Minimum heat-treat temperatures are specified; however, it is sometimes necessary to heat-treat at higher temperatures, hold for some minimum time at temperature and then rapidly cool the castings in order to enhance the corrosion resistance and meet the required mechanical properties.
What is the difference between these specifications? This abstract is a brief summary of the referenced standard. Proper heat treatment of these alloys is usually necessary to enhance corrosion resistance and in some cases to meet mechanical properties. Certification must be provided listing the chemical analysis of the heat and the mechanical property test results.