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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For this reason alone, many specifications that don’t require actual tensile testing are not represented in these codes. Proper heat treatment of these alloys is usually necessary to enhance corrosion resistance and in some cases to meet mechanical properties.
What is sstm difference between these specifications? Emerson Completes Acquisition of iSolutions Inc.
Duplex Stainless Steels
New Washer Application Search Tool. The Adventures of Duke Waters. 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. Castings shall be heat treated in accordance with the required procedure and heat-treat temperature. ViewIn Technology for Mechanical Seals.
Emerson Completes Acquisition of iSolutions I. Work Item s – proposed revisions of this standard. Certification must be provided listing the chemical analysis of the heat and the mechanical property test results. A valve company took exception, and indicated that duplex valve bodies and bonnets would be supplied per ASTM A 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.
However, A imposes some additional requirements: Each casting must be hydrostatically tested. Link to Active This link will always route to the current Active version of the standard.
However, one thing is astmm 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.
Any casting that meets A also meets A The material may be adopted in ASME codes for specific products or applications, including: 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 Asm is imposed on the purchase order.
ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. A imposes several other requirements that are not included in A nor A However, A imposes some additional requirements:. Custom Hydraulic Power Units. As such, many piping specifications include references to ASTM A and its various duplex grades for zstm components such as valves.
A grades will not be added for the same reason. The steel shall conform to the required chemical composition for carbon, manganese, silicon, phosphorus, sulfur, chromium, nickel, molybdenum, copper, tungsten, and nitrogen.
Texas Manufacturing Expands Modestly, Outlook. Minimum heat-treat temperatures are specified; however, it is sometimes necessary to heat-treat at higher a89, 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.
Combining values from the two systems may result in nonconformance with the standard.
Duplex Stainless Steel Investment Casting Compositions – Wisconsin Precision Casting
ASTM A was reapproved without changes in ASTM A lists tensile property requirements, but does not require that the tensile tests actually be performed. Rigging and Lifting of Large Valves Post: Shale Work Up in U. Castings shall be marked for material identification with the specification designation and grade.
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Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the a809. Marking of heat numbers on castings is not required unless specified separately on the purchase order. Each casting must be marked with a heat number or with a serial number traceable to a heat number.
Tensile tests are only required if Supplementary Requirement S32 is specified on the purchase order. New Products Prev Next Rotork: In order to obtain a test report showing the actual chemistry and tensile test results, Supplementary Requirement S12 must also be imposed.
Upcoming Valve Industry Events Reprints. Historical Version s – ast previous versions of standard.