ASTM A747 A747M-2007 Standard Specification for Steel Castings Stainless Precipitation Hardening《沉淀硬化不锈钢铸件的标准规范》.pdf
《ASTM A747 A747M-2007 Standard Specification for Steel Castings Stainless Precipitation Hardening《沉淀硬化不锈钢铸件的标准规范》.pdf》由会员分享,可在线阅读,更多相关《ASTM A747 A747M-2007 Standard Specification for Steel Castings Stainless Precipitation Hardening《沉淀硬化不锈钢铸件的标准规范》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: A 747/A 747M 07Standard Specification forSteel Castings, Stainless, Precipitation Hardening1This standard is issued under the fixed designation A 747/A 747M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of
2、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.1. Scope*1.1 This specification covers iron-chromium-nickel-coppercorrosion-resistant steel castings, capable of being strength-e
3、ned by precipitation hardening heat treatment.1.2 These castings may be used in services requiring corro-sion resistance and high strengths at temperatures up to 600F315C. They may be machined in the solution-annealedcondition and subsequently precipitation hardened to the de-sired high-strength mec
4、hanical properties specified in TableS14.1 with little danger of cracking or distortion.1.3 The material is not intended for use in the solution-annealed condition.NOTE 1If the service environment in which the material is to be usedis considered conducive to stress-corrosion cracking, precipitation
5、hard-ening should be performed at a temperature that will minimize thesusceptibility of the material to this type of attack.1.4 Supplementary requirements of an optional nature areprovided for use at the option of the purchaser. The Supple-mentary requirements shall apply only when specified indi-vi
6、dually by the purchaser in the purchase order or contract.1.5 This specification is expressed in both inch-pound unitsand in SI units; however, unless the purchase order or contractspecifies the applicable M specification designation (SI units),the inch-pound units shall apply. The values stated in
7、eitherinch-pound units or SI units are to be regarded separately asstandard. Within the text, the SI units are shown in brackets.The values stated in each system may not be exact equivalents;therefore, each system shall be used independently of the other.Combining values from the two systems may res
8、ult in noncon-formance with the standard.2. Referenced Documents2.1 ASTM Standards:2A 370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA 781/A 781M Specification for Castings, Steel and Alloy,Common Requirements, for General Industrial UseA 957/A 957M Specification for Investm
9、ent Castings, Steeland Alloy, Common Requirements, for General IndustrialUse2.2 ASME Standard:3ASME Boiler and Pressure Vessel Code, SupplementaryRequirements S6, S14, and S273. General Conditions for Delivery3.1 Except for investment castings, castings furnished tothis specification shall be in acc
10、ordance with the requirementsof Specification A 781/A 781M, including any supplementaryrequirements that are indicated in the purchase order. Failure tocomply with the general requirements of Specification A 781/A 781M constitutes nonconformance with this specification. Incase of conflict between th
11、e requirements of this specificationand Specification A 781/A 781M, this specification shall pre-vail.3.2 Steel investment castings furnished to this specificationshall conform to the requirements of Specification A 957/A 957M, including any supplementary requirements that areindicated in the purcha
12、se order. Failure to comply with thegeneral requirements of Specification A 957/A 957M consti-tutes nonconformance with this specification. In case of con-flict between the requirements of this specification and Speci-fication A 957/A 957M, A 957/A 957M shall prevail.4. Ordering Information4.1 Order
13、s for material to this specification should includethe following:4.1.1 Quantity,4.1.2 Specification designation and date of issue,4.1.3 Grade designation Table 1, and4.1.4 Description of casting by part, pattern, or drawingnumber. (Dimensional tolerances and machined surfacesshould be indicated on t
14、he casting drawing).4.1.5 Heat treatment condition (SA, H900, and so forth), see5.2 and Table 2,4.1.6 Options in the specification, if any, in accordance with5.2 and Section 7, and1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is t
15、he direct responsibility of SubcommitteeA01.18 on Castings.Current edition approved June 1, 2007. Published July 2007. Originally approvedin 1977. Last previous edition approved in 2004 as A 747/A 747M 04.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer S
16、ervice at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.or
17、g.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.1.7 Supplementary requirements, if any, including thestandards of acceptance.4.1.8 Notice when the castings are to
18、be used in equipmentcovered by the ASME Boiler and Pressure Vessel Code,Supplementary Requirements S6, S14, and S27 are mandatoryand must be specified in the purchase order.5. Materials and Manufacture5.1 The steel shall be made by the electric furnace processwith or without separate refining such a
19、s argon-oxygen decar-burization (AOD).5.2 Heat TreatmentCastings may be given a homogeni-zation heat treatment in accordance with 5.2.1 at the suppliersoption or when specified by the purchaser (see S26) prior tosolution heat treatment. All castings, whether homogenized ornot, shall be given a solut
20、ion treatment in accordance with5.2.2 and unless ordered in the solution-annealed conditionshall be precipitation hardened to the ordered condition (Table1).5.2.1 Homogenization heat treatment shall consist of heat-ing the castings and test material to a minimum of 1900F1040C, holding for a minimum
21、of 112 h, and cooling tobelow 90F 30C.5.2.2 Solution annealing heat treatment shall consist ofheating the castings and test material to 1925F 6 50F1050C 6 30C, holding the 30 min/in. 1.2 min/mm ofsection but not less than 30 min, and cooling to below 90F30C.5.2.3 Temperature used for precipitation h
22、ardening shall bemaintained within the range of 625F 615C of that listed inTable 1 for the heat-treatment condition ordered. (See Note 1)5.2.4 When the order or contract specifies a minimumcolumbium content, the minimum precipitation hardeningtemperature shall be 925F 495C.6. Chemical Composition6.1
23、 The steel shall be in accordance with the requirementsas to chemical composition prescribed in Table 2.6.2 When the H900 condition is ordered, the minimumcolumbium content (Table 2) shall not apply. It is recom-mended that columbium other than that in revert material notbe added.7. Repair by Weldin
24、g7.1 Repairs shall be made only in one of the followingconditions: homogenized, solution annealed, H1100, H1150,H1150M, H1150DBL, or stress relieved at 1150F 6 25F620C 6 15C for a minimum of 4 h.7.2 Castings welded in one of the aged conditions noted in7.1 shall be post weld heat treated by the same
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
最后一页预览完了!喜欢就下载吧,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTMA747A747M2007STANDARDSPECIFICATIONFORSTEELCASTINGSSTAINLESSPRECIPITATIONHARDENING 沉淀 硬化 不锈钢 铸件 标准规范

链接地址:http://www.mydoc123.com/p-459382.html