ASTM A990 PDF

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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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. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other.

Combining values from the two systems may result in nonconformance with this speci? It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Referenced Documents 2. Current edition approved March 1, Published March Originally approved in Last previous edition approved in as A — M 0. Terminology 3.

Also includes scrapped machinery and fabricated items, chips, and turnings. General Conditions for Delivery 4. Failure to comply with the general requirements of Speci? In case of con? Ordering Information 5. Such requirements may include, but are not limited to, the following: 5. Dimensional tolerances should be included on the casting drawing. Class D will be supplied unless otherwise speci? Maximum Casting Thickness less than 5?

Process and Manufacture 6. Chemical Composition 7. An analysis of every heat is required. Tensile Properties 8. Test results shall conform to the tensile requirements speci? The bar shall be solution heat treated per the requirements of Table 4 in production furnaces to the same procedure as the castings it represents.

If the casting grade does not require heat treatment, the bar used for the test specimen shall not be heat treated. Weldability Quali? Quench in water. A As-cast A Quench in water or rapid cool by other means as agreed upon by the manufacturer and purchaser. Remove one 3? Nondestructive Examination Classes A, B, C, and D are de? Each class imposes speci? Fusion discontinuities, expansion discontinuities, and inserts are unacceptable.

All other surface features must meet the acceptance criteria class in Table 2. If the second casting passes, then no additional radiography beyond the normal amount is required.

If that second casting fails, all remaining castings shall be radiographed in only the rejectable areas found on the? Repair by Welding Only the? Initial excavation of defects may be accomplished by any method including air-arc gouging, grinding, or machining; however, all visible traces of the air-arc process shall be removed by grinding or machining.

All surfaces to be welded and at least 1 in. The cleaning may be accomplished by grinding or by machining followed by solvent washing. Heat Treatment Workmanship, Finish, and Appearance Final cleaning shall be accomplished by blasting with clean nonmetallic media not previously used on steel or iron parts, pickling, machining, or other approved methods approved by the purchaser.

Product Marking Keywords The distinguishing requirements of this speci? ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phone , fax , or service astm.

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ASTM A990/A990M

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. Combining values from the two systems may result in nonconformance with this specifi- cation.

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ASTM A990 Grade CN3MCu Heat-Treated

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

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