ASTM A27 A27M-2010 Standard Specification for Steel Castings Carbon for General Application《通用应用件的钢铸件 碳含量标准规格》.pdf
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1、Designation: A27/A27M 10Standard Specification forSteel Castings, Carbon, for General Application1This standard is issued under the fixed designation A27/A27M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revisi
2、on. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 This specification covers carbon steel castings
3、 for gen-eral applications that require up to 70 ksi (485 MPa) minimumtensile strength.NOTE 1The grades covered by this specification represent materialsthat are suitable for assembly with other steel castings or wrought steelparts by fusion welding. It is not intended to imply that all these grades
4、possess the same degree of weldability or that the same weldingtechniques can be used on all castings. It is the responsibility of thepurchaser to establish for himself a suitable welding technique.1.2 Several grades and two classes of steel castings arecovered, as indicated below. The grade and cla
5、ss desired shallbe specified by the purchaser.1.2.1 Grade N-1Chemical analysis only.1.2.2 Grade N-2Heat-treated but not mechanically tested.1.2.3 Grade U-60-30 415-205Mechanically tested butnot heat-treated.1.2.4 Grades 60-30 415-205, 65-35 450-240, 70-36485-250, and 70-40 485-275Heat-treated and me
6、chani-cally tested.1.2.5 Class 1 and Class 2 steel castings shall be specified inaccordance with 9.2.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be use
7、d independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate s
8、afety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA732/A732M Specification for Castings, Investment, Car-bon and Low Alloy Steel for Ge
9、neral Application, andCobalt Alloy for High Strength at Elevated TemperaturesA781/A781M Specification for Castings, Steel and Alloy,Common Requirements, for General Industrial UseA957/A957M Specification for Investment Castings, Steeland Alloy, Common Requirements, for General IndustrialUse3. Genera
10、l Conditions for Delivery3.1 Except for steel investment castings, material furnishedto this specification shall conform to the requirements ofSpecification A781/A781M, including any supplementary re-quirements that are indicated in the purchase order. Failure tocomply with the general requirements
11、of Specification A781/A781M constitutes nonconformance with the specification. Incase of a conflict between the requirements of this specificationand Specification A781/A781M, this specification shall pre-vail.3.2 Steel investment castings furnished to this specificationshall conform to the requirem
12、ents of Specification A957/A957M, including any supplementary requirements that areindicated in the purchase order. Failure to comply with thecommon requirements of Specification A957/A957M consti-tutes nonconformance with this specification. In case of con-flict between the requirements of this spe
13、cification and Speci-fication A957/A957M, Specification A957/A957M shallprevail.4. Ordering Information4.1 Orders for material under this specification shouldinclude the following information in proper sequence.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless St
14、eel and Related Alloys and is the direct responsibility of SubcommitteeA01.18 on Castings.Current edition approved Oct. 1, 2010. Published November 2010. Originallyapproved in 1901. Last previous edition approved in 2008 as A27/A27M 08. DOI:10.1520/A0027_A0027M-10.2For referenced ASTM standards, vis
15、it the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International,
16、 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.1.1 Quantity,4.1.2 Specification, grade (1.2), and class (9.2),4.1.3 Description of the casting by pattern number ordrawing,4.1.4 Options in the specification, and4.1.5 Supplementary requirements desired, includin
17、g stan-dards of acceptance.5. Heat Treatment5.1 All castings of Grades N-2, 60-30 415-205, 65-35450-240, 70-36 485-250, and 70-40 485-275 shall beheat-treated by full annealing, normalizing, normalizing andtempering, or quenching and tempering. Unless otherwisespecified in the inquiry, contract, or
18、order, the castings may beheat-treated by any one or combination of these heat-treatments at the option of the manufacturer.5.1.1 Heat-treatment shall be performed after castings havebeen allowed to cool from the pouring temperature to belowthe transformation range.5.2 Furnace temperatures for heat-
19、treating shall be regulatedby the use of pyrometers.6. Chemical Composition6.1 The steel shall conform to the requirements as tochemical composition prescribed in Table 1. Product analysistolerances shall conform to the Product Analysis Tolerancesshown in Specification A781/A781M. When residual elem
20、entchemical content is of interest to the purchaser, S54 may beconsidered.7. Tensile Properties7.1 Except for Grades N-1 and N-2, one tension test shall beperformed on each heat and the mechanical properties thusdetermined shall conform to the requirements specified inTable 2. The tension test shall
21、 be performed in accordance withTest Methods and Definitions A370.7.2 Test bars shall be poured in special blocks similar tothose shown in Fig. 1 of Specification A781/A781M and fromthe same heat as the casting represented.7.3 Test coupons may be cut from the heat-treated (ifrequired) castings or ca
22、st integrally with the castings at theproducers option.7.4 The test bars for heat-treated castings shall be heat-treated in production furnaces to the same procedure as thecastings they represent. When specified by the purchaser, thetest bars shall be heat-treated with the castings.7.5 Test specimen
23、s shall be machined to the form anddimensions shown in Fig. 4 of Test Methods and DefinitionsA370, with the ends machined to fit the grips on the tensiletesting machine to be used. Suggested types of ends forstandard round tension test specimens are shown in Fig. 5 ofTest Methods and Definitions A37
24、0.7.6 If any specimen is machined improperly or if flaws arerevealed by machining or during testing, the specimen may bediscarded and another substituted from the same heat.7.7 When this specification is applied to investment cast-ings, test coupons and tension test specimens shall be obtainedand pr
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