ASTM A990 PDF
Find the most up-to-date version of ASTM A at Engineering Find the most up-to-date version of ASTM A/AM at Engineering ASTM A Castings, Iron-Nickel-Chromium and Nickel Alloys, Specially Controlled for Pressure Retaining Parts for Corrosive
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A — 05 Standard Specification for Castings, Iron-Nickel-Chromium and Nickel Alloys, Specially Controlled for Pressure Retaining Parts for Corrosive Service1 This standard is issued under the fixed designation A ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
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 awtm 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 aztm therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with this specifi- cation. It is the responsibility of the user of this standard to establish appro- priate safety and health practices and determine the applica- bility of regulatory limitations prior to use.
ASTM A 全文-调研报告-在线文档
Current edition approved March 1, Originally approved in Last previous edition approved in as A — Also includes scrapped machinery and fabricated items, chips, and turnings. General Conditions for Delivery 4. Such requirements may include, but are not limited to, the following: Dimensional tolerances should be included on the casting drawing. Class D will be supplied unless otherwise specified.
Process and Manufacture 6. An analysis of every heat is required. Test results shall conform to the tensile requirements specified in Table 3. 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.
Each class imposes specific requirements for three different NDE meth- ods. Fusion discontinuities, expansion discontinuities, and inserts are un- acceptable.
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 re- quired. If that second casting fails, all remaining castings shall be radiographed in only the rejectable areas found on the first and second castings. A M As-cast A Quench in water or rapid cool by other means as agreed upon by the manufacturer and purchaser.
Repair by Welding Only the filler material grades specified in Table 5 shall be used. 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. Workmanship, Finish, and Appearance Final cleaning shall be accomplished by blasting with clean nonme- tallic media not previously used on steel or iron parts, pickling, machining, or other approved methods approved by the pur- chaser.
ASTM A990/A990M – 18
The distinguishing require- ments of this specification are as follows. 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 a99 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 adtm the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn.
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 satm a meeting of the responsible technical committee, which you may attend. If you feel that your comments have not received adtm 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 phonefaxor service astm.
Specialization, intermediation, and growth. Part1 Financial Planning, Performance, and Control.