ASTM A990 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. Since these grades possess varying degrees of suitability for service in corrosive environments, it is the responsibility of the purchaser to determine which grade shall be furnished. Selection will depend on design and service conditions, mechanical properties, and corrosion-resistant characteristics. Within the text, the SI units are shown in parentheses.

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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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ASTM A990/A990M

More A The choice of manufacturing procedure to be used for producing the alloy castings shall be according to specified metallic contents. Materials shall conform to specified chemical composition and tensile property requirements, and weldability qualifications. Nondestructive examination requirements such as casting thickness shall be evaluated by visual, radiographic, and liquid penetrant inspection. Castings shall be repair welded and solution heat treated prior to final cleaning by blasting, and shall not be peened, plugged, or impregnated. This abstract is a brief summary of the referenced standard. 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.

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ASTM A990 Grade CW-2M Heat-Treated

A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Since these grades possess varying degrees of suitability for service in corrosive environments, it is the responsibility of the purchaser to determine which grade shall be furnished. Selection will depend on design and service conditions, mechanical proper- ties, and corrosion-resistant characteristics. Within the text, the SI units are shown in parentheses. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other.

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ASTM A990 Grade CN3MCu Heat-Treated

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