1、Designation: A958/A958M 10A958/A958M 14Standard Specification forSteel Castings, Carbon and Alloy, with TensileRequirements, Chemical Requirements Similar to StandardWrought Grades1This standard is issued under the fixed designation A958/A958M; the number immediately following the designation indica
2、tes the yearof 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 () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers carbon and low-al
3、loy steel castings having chemical analyses similar to that of the standardwrought grades.1.2 Several classes are covered and are designated by chemical composition as shown in Table 1.1.3 Options for tensile properties are shown in Tables 2 and 3.1.4 The values stated in either SI units or inch-pou
4、nd units are to be regarded separately as standard. The values stated in eachsystem may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from thetwo systems may result in non-conformance with the standard.1.4.1 Within the text, the SI units
5、are shown in brackets.2. Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testing of Steel ProductsA488/A488M Practice for Steel Castings, Welding, Qualifications of Procedures and PersonnelA781/A781M Specification for Castings, Steel and Alloy, Common Require
6、ments, for General Industrial UseA957/A957M Specification for Investment Castings, Steel and Alloy, Common Requirements, for General Industrial UseE29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications3. General Conditions for Delivery3.1 Material furnish
7、ed to this specification shall conform to the requirements of Specification A781/A781M, including anysupplementary requirements that are indicated in the purchase order. Failure to comply with the general requirements ofSpecification A781/A781M constitutes nonconformance with this specification. In
8、case of conflict between the requirements of thisspecification and Specification A781/A781M, this specification shall prevail.3.2 Steel investment castings furnished to this specification shall conform to the requirements of Specification A957/A957M,including any supplementary requirements that are
9、indicated in the purchase order. Failure to comply with the general requirementsof Specification A957/A957M constitutes nonconformance with this specification. In case of conflict between the requirements ofthis specification and Specification A957/A957M, Specification A957/A957M shall prevail.4. Or
10、dering Information4.1 Orders for material under this specification should include the following information.4.1.1 Quantity,4.1.2 Specification, including year and date of issue,4.1.3 Grade and class of steel,1 This specification is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Stee
11、l and RelatedAlloys and is the direct responsibility of Subcommittee A01.18on Castings.Current edition approved April 1, 2010March 1, 2014. Published April 2010March 2014. Originally approved in 1996. Last previous edition approved in 20092010 asA958 09A958 10. 1. DOI: 10.1520/A0958_A0958M-10.10.152
12、0/A0958_A0958M-14.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and i
13、s intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the
14、 current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.1.4 Description of the c
15、asting by pattern number or drawing (Dimensional tolerances should be included on the castingdrawing.),4.1.5 Options in the specification, and4.1.6 Supplementary requirements desired, including standards of acceptance.5. Heat Treatment5.1 All castings shall receive a heat treatment indicated in Tabl
16、e 4. Preliminary heat treatment prior to final heat treatment aswell as multiple tempering is permitted.5.2 Heat treatment shall be performed after the castings have been allowed to cool below the transformation range.5.3 The furnace temperature for heat treating shall be effectively controlled by t
17、he use of recording-type pyrometers.6. Chemical Composition6.1 The steel shall conform to the requirements of chemical composition as prescribed in Table 1.TABLE 1 Chemical Composition, Weight PercentNOTE 1Values are maximum unless a range is given.Grade C Mn P S Si Ni Cr MoSC 1020 0.18/0.23 0.40/0.
18、80 0.040 0.040 0.30/0.60 - - -SC 1025 0.22/0.28 0.40/0.80 0.040 0.040 0.30/0.60 - - -SC 1030 0.28/0.34 0.50/0.90 0.040 0.040 0.30/0.60 - - -SC 1040 0.37/0.44 0.50/0.90 0.040 0.040 0.30/0.60 - - -SC 1045 0.43/0.50 0.50/0.90 0.040 0.040 0.30/0.60 - - -SC 4130 0.28/0.33 0.40/0.80 0.035 0.040 0.30/0.60
19、- 0.80/1.10 0.15/0.25SC 4140 0.38/0.43 0.70/1.10 0.035 0.040 0.30/0.60 - 0.80/1.10 0.15/0.25SC 4330 0.28/0.33 0.60/0.90 0.035 0.040 0.30/0.60 1.65/2.00 0.70/0.90 0.20/0.30SC 4340 0.38/0.43 0.60/0.90 0.035 0.040 0.30/0.60 1.65/2.00 0.70/0.90 0.20/0.30SC 8620 0.18/0.23 0.60/1.00 0.035 0.040 0.30/0.60
20、0.40/0.70 0.40/0.60 0.15/0.25SC 8625 0.23/0.28 0.60/1.00 0.035 0.040 0.30/0.60 0.40/0.70 0.40/0.60 0.15/0.25SC 8630 0.28/0.33 0.60/1.00 0.035 0.040 0.30/0.60 0.40/0.70 0.40/0.60 0.15/0.25TABLE 2 Tensile RequirementsClass 65/35 70/36 80/40 80/50 90/60 105/85 115/95 130/115 135/125 150/135 160/145 165
21、/150 210/180Tensile, ksiTensile, min.(MPa)65450704858055080550906201057251157951308951359301501035160110516511402101450Yield, ksiYield, min.(MPa)35240362504027550345604158558595655115795125860135930145100015010351801240Elongation in 2in. or 50 mm,min, %24 22 18 22 18 17 14 11 9 7 6 5 4Reduction ofAr
22、ea, min. %35 30 30 35 35 35 30 25 22 18 12 10 8TABLE 3 Tensile Requirements/Grade SuitabilityClass 65/35 70/36 80/40 80/50 90/60 105/85 115/95 130/115 135/125 150/135 160/145 165/150 210/180GradeSC 1020 XA XSC 1025 X XSC 1030 X X X XSC 1040 XB X X X XSC 1045 XB XB X X X X XSC 4130 XB XB X X X X X X
23、X XSC 4140 XB XB XB XB X X X X X X X XSC 4330 XB XB XB XB X X X X X X X X XSC 4340 XB XB XB XB XB X X X X X X X XSC 8620 XB XB X X X X XSC 8625 XB XB X X X X X X XSC 8630 XB XB X X X X X X X XA“X” denotes that the properties may be achieved by at least one of the heat treatments referenced in 5. The
24、 effect of section thickness should be considered in makinggrade selections. The heat treatment requirements do not imply that all section thicknesses will be through hardened.BThese grades significantly exceed the minimum strength levels; therefore, they may be unsuitable for use due to weldability
25、, and machinability issues.A958/A958M 142TABLE 4 Heat TreatmentNOTE 1The effect of section thickness should be considered in making grade selections. The heat treatment requirements do not imply that all sectionthicknesses will be through hardened.NOTE 2Post-weld heat treatment must be at or below t
26、he final tempering temperature.NOTE 3Following quenching the castings must be cooled below 500F 260C prior to tempering.Grade Class AustenitizingTemperature,min, F CMedia TemperingTemperature,min, F CSC1020 65/35 1700 925 AA 70/36 1700 925 A SC1025 65/35 1700 925 A 70/36 1700 925 A SC1030 65/35 1650
27、 900 A 70/36 1650 900 A 1100 59580/40 1650 900 LA 1100 59580/50 1650 900 L 1100 595SC1040 65/35B 1650 900 A 1150 62170/36 1650 900 A 1150 62180/40 1650 900 A 1150 62180/50 1650 900 A 1100 59590/60 1650 900 A 1100 595SC1045 65/35B 1600 870 A 1150 62170/36B 1600 870 A 1150 62180/40 1600 870 A 1150 621
28、80/50 1600 870 A 1150 62190/60 1600 870 A 1100 595105/85 1600 870 A 1100 595115/95 1600 870 A 1050 565SC4130 65/35B 1650 900 A 1200 65070/36B 1650 900 A 1200 65080/40 1650 900 A 1200 65080/50 1650 900 A 1200 65090/60 1650 900 A or L 1150 621105/85 1650 900 L 1100 595115/95 1650 900 L 1100 595130/115
29、 1650 900 L 1000 538135/125 1650 900 L 1000 538150/135 1650 900 L 1000 538SC4140 65/35B 1600 870 A 1200 65070/36B 1600 870 A 1200 65080/40B 1600 870 A 1200 65080/50B 1600 870 A 1150 62190/60 1600 870 A 1150 621105/85 1600 870 A or L 1150 621115/95 1600 870 L 1050 566130/115 1600 870 L 1000 538135/12
30、5 1600 870 L 1000 535150/135 1600 870 L 950 510160/145 1600 870 L 950 510165/150 1600 870 L 950 510SC4330 65/35B 1650 870 A 1200 65070/36B 1650 870 A 1200 65080/40B 1650 870 A 1200 65080/50B 1650 870 A 1200 65090/60 1650 870 A or L 1150 620105/85 1650 870 L 1100 595115/95 1650 870 L 1100 595130/115
31、1650 870 L 1000 535135/125 1650 870 L 1000 535150/135 1650 870 L 1000 535160/145 1650 870 L 950 510165/150 1650 870 L 950 510210/180 1650 870 L 900 482SC4340 65/35B 1600 870 A 1200 65070/36B 1600 870 A 1200 65080/40B 1600 870 A 1200 65080/50B 1600 870 A 1150 620A958/A958M 1436.2 The product analysis
32、 tolerances given in Specification A781/A781M shall apply to all product analyses performed oncastings supplied to this specification.7. Tensile Requirements7.1 One tension test shall be made from each heat and shall conform to the tensile requirements specified for the grade selectedin Tables 2 and
33、 3.7.2 Tension test coupons shall be machined in accordance with Paragraph 8 of Test Methods and Definitions A370 and testedin accordance with those methods.7.3 To determine conformance with the tension test requirements, an observed value or calculated value shall be rounded inaccordance with Pract
34、ice E29 to the nearest 500 psi 5 MPa for yield point and tensile strength and to the nearest 1 % forelongation and reduction of area.8. Repair by Welding8.1 Repairs shall be made using procedures and welders qualified in accordance with Practice A488/A488M.8.2 Repair welds shall be inspected to the
35、same quality standards that are used to inspect the castings. When castings areproduced with Supplementary Requirement S1 specified, weld repairs shall be inspected by magnetic particle examination to thesame standards that are used to inspect the castings. When castings are produced with Supplement
36、ary S2 or S4, or both, asspecified, weld repairs in which the depth of the cavity prepared for weld repair exceeds 20 % of the wall thickness or 1 in. 25mm, whichever is smaller, or in which the cavity prepared for welding is greater than approximately 10 in.2 65 cm2, shall beradiographed or ultraso
37、nically tested, or both, to the same standards that are used to inspect the castings.TABLE 4 ContinuedGrade Class AustenitizingTemperature,min, F CMedia TemperingTemperature,min, F C90/60B 1600 870 A 1150 620105/85 1600 870 A 1150 620115/95 1600 870 A or L 1050 565130/115 1600 870 L 1000 535135/125
38、1600 870 L 1000 535150/135 1600 870 L 950 510160/145 1600 870 L 950 510165/150 1600 870 L 950 510210/180 1600 870 L 900 480SC8620 65/35B 1700 925 A 1200 65070/36B 1700 925 A 1200 65080/40 1700 925 A 1150 62080/50 1700 925 A or L 1150 62090/60 1700 925 L 1150 620105/85 1700 925 L 1100 595115/95 1700
39、925 L 1050 565SC8625 65/35B 1700 925 A 1200 65070/36B 1700 925 A 1200 65080/40 1700 925 A or L 1150 62080/50 1700 925 A or L 1150 62090/60 1700 925 A or L 1150 620105/85 1700 925 L 1100 595115/95 1700 925 L 1100 595130/115 1700 925 L 1100 595135/125 1700 925 L 1050 565SC8630 65/35B 1650 900 A 1200 6
40、5070/36B 1650 900 A 1200 65080/40 1650 900 A 1150 62080/50 1650 900 A 1150 62090/60 1650 900 A or L 1150 620105/85 1650 900 L 1100 595115/95 1650 900 L 1100 595130/115 1650 900 L 1100 595135/125 1650 900 L 1050 565150/135 1650 900 L 1050 565AA = air cool (normalize).L = Liquid quench. (Steels with c
41、arbon levels of 0.33 % and higher may exhibit cracks when quenched in water).BThese grades are likely to significantly exceed the minimum strength levels, therefore, problems may be experienced when trying to produce castings to low hardnessvalues.A958/A958M 1448.3 For all classes of Grades SC1020,
42、SC1025, and SC1030, welds exceeding 20 % of the wall thickness or 1 in. 25 mm,whichever is smaller, or exceeding approximately 10 in. 2 65 cm2 in area, shall be thermally stress-relieved or completelyreheat-treated. All other grades and classes shall be thermally stress-relieved or completely reheat
43、-treated following any repairwelds.9. Test Coupons and Specimens9.1 Test bars shall be poured from the same heat as the castings represented. Test coupons may be cast integrally with thecastings or as separate blocks similar to those shown in Fig. 1 of Specification A781/A781M.9.2 The bar from which
44、 the test piece is taken shall be heat-treated in production furnaces to the same procedure as the castingsit represents.When the bar from which the test piece is taken is not heat-treated as part of the same heat-treatment load as the casting(s) itqualifies, the austenitizing temperatures for the b
45、ar shall be within 25F 15C of those for the casting(s). The temperingtemperature for the bar shall be no higher than 25F 15C above that of the casting(s) and no higher than that permitted by theheat-treatment procedure for the material. The cycle time at each temperature shall not exceed that for th
46、e casting(s).9.3 Test specimens may be cut from heat-treated castings at the producers option, instead of from test bars.9.4 If any specimen shows defective machining or exhibits flaws, it may be discarded and another substituted from the sameheat.9.5 If the results of the mechanical tests for any h
47、eat or lot or casting do not conform to the requirements agreed upon, retestsare permitted in accordance with Test Methods and Definitions A370.At the manufacturers option, castings may be reheat-treatedand retested. Testing after reheat-treatment shall consist of the full number of specimens taken
48、from locations complying with thespecification or order.SUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall not apply unless specified in the purchase order.Alist of standardized supplementary requirements for use at the option of the purchaser is included inSpecification A781/A781M. Those which are ordinarily considered suitable for use with thisspecification are given as follows together
