ASTM A890 PDF

A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. 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. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.

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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 that meets A also meets A A does not. 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. A imposes several other requirements that are not included in A nor A Each heat of material 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. ASTM A was reapproved without changes in Mechanical properties vs. 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.

A grades will not be added for the same reason.

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Materials Q&A

More A Castings shall be heat treated in accordance with the required procedure and heat-treat temperature. Proper heat treatment of these alloys is usually necessary to enhance corrosion resistance and in some cases to meet mechanical properties. 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. The steel shall conform to the required chemical composition for carbon, manganese, silicon, phosphorus, sulfur, chromium, nickel, molybdenum, copper, tungsten, and nitrogen. Castings shall be marked for material identification with the specification designation and grade.

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Duplex Stainless

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.

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