1、Designation: A958/A958M 17Standard 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 indicates the yearo
2、f 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-alloy steelcast
3、ings having chemical analyses similar to that of thestandard wrought grades.1.2 Several classes are covered and are designated bychemical composition as shown in Table 1.1.3 Options for tensile properties are shown in Tables 2 and3.1.4 The values stated in either SI units or inch-pound unitsare to b
4、e regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in nonconformancewith the standard.1.4.1 Within the text, the SI units are shown in bracket
5、s.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers
6、to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A488/A488M Practice for Steel Castings, Welding, Qualifi-cations of Procedures and PersonnelA781/A781M Specification for Castings, Steel and Alloy,Common Requirements, for General Industrial UseA957/A957M Specification for Investmen
7、t Castings, Steeland Alloy, Common Requirements, for General IndustrialUse3. General Conditions for Delivery3.1 Material furnished to this specification shall conform tothe requirements of Specification A781/A781M, including anysupplementary requirements that are indicated in the purchaseorder. Fail
8、ure to comply with the general requirements ofSpecification A781/A781M constitutes nonconformance withthis specification. In case of conflict between the requirementsof this specification and Specification A781/A781M, thisspecification shall prevail.3.2 Steel investment castings furnished to this sp
9、ecificationshall conform to the requirements of Specification A957/A957M, including any supplementary requirements that areindicated in the purchase order. Failure to comply with thegeneral requirements of Specification A957/A957M consti-tutes nonconformance with this specification. In case of con-f
10、lict between the requirements of this specification and Speci-fication A957/A957M, Specification A957/A957M shallprevail.4. Ordering Information4.1 Orders for material under this specification shouldinclude the following information:4.1.1 Quantity,4.1.2 Specification, including year and date of issu
11、e,4.1.3 Grade and class of steel,4.1.4 Description of the casting by pattern number ordrawing (Dimensional tolerances should be included on thecasting drawing.),4.1.5 Options in the specification, and4.1.6 Supplementary requirements desired, including stan-dards of acceptance.5. Heat Treatment5.1 Al
12、l castings shall receive a heat treatment indicated inTable 4. Preliminary heat treatment prior to final heat treatmentas well as multiple tempering is permitted.5.2 Heat treatment shall be performed after the castingshave been allowed to cool below the transformation range.1This specification is un
13、der the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.18 on Castings.Current edition approved May 1, 2017. Published May 2017. Originallyapproved in 1996. Last previous edition approved in 2015 as A958 15. DOI:10.15
14、20/A0958_A0958M-17.2For referenced ASTM standards, visit 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.*A Summary of Changes section appears at t
15、he end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for
16、theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.15.3 The furnace temperature for heat treating shall beeffectively controlled by the use of recording-type pyrometers.6. Chemical Composition6.1 Th
17、e steel shall conform to the requirements of chemicalcomposition as prescribed in Table 1.6.2 The product analysis tolerances given in SpecificationA781/A781M, or for investment castings, Specification A957/A957M, shall apply to all product analyses performed oncastings supplied to this specificatio
18、n.7. Tensile Requirements7.1 One tension test shall be made from each heat, forinvestment castings, each master heat, and shall conform to thetensile requirements specified for the grade selected in Tables2 and 3.8. Repair by Welding8.1 Repairs shall be made using procedures and weldersqualified in
19、accordance with Practice A488/A488M.8.2 Repair welds shall be inspected to the same qualitystandards that are used to inspect the castings. When castingsare produced with Supplementary Requirement S1 specified,weld repairs shall be inspected by magnetic particle examina-tion to the same standards th
20、at are used to inspect the castings.When castings are produced with Supplementary S2 or S4, orboth, as specified, weld repairs in which the depth of the cavityprepared for weld repair exceeds 20 % of the wall thickness or1 in. 25 mm, whichever is smaller, or in which the cavityprepared for welding i
21、s greater than approximately 10 in.265 cm2, shall be radiographed or ultrasonically tested, orboth, to the same standards that are used to inspect the castings.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 0.4
22、0/0.80 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
23、.60 - 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
24、.60 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
25、 165/150 210/180Tensile, ksiTensile, min.(MPa)65450704858055080550906201057251157951308951359301501035160110516511402101450Yield, ksiYield, min.(MPa)35240362504027550345604158558595655115795125860135930145100015010351801240Elongation in 2in.or50mm,min, %42182181714197654Reduction ofArea, min. %35 30
26、 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 XAXSC 1025 X XSC 1030 X X X XSC 1040 XBXX XSC 1045 XBXBXX XXSC 4130 XBXBX XXXSC 4140 XBXBXBXBXX XXXXSC 4330 XBXB
27、XBXBX X XSC 4340 XBXBXBXBXBXXXXXXXXSC 8620 XBXBXX XXSC 8625 XBXBX XXSC 8630 XBXBXX XX XA“X” denotes that the properties may be achieved by at least one of the heat treatments referenced in 5. The effect of section thickness should be considered in makinggrade selections. The heat treatment requireme
28、nts 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, and machinability issues.A958/A958M 172TABLE 4 Heat TreatmentNOTE 1The effect of section thickness shou
29、ld 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 the final tempering temperature.NOTE 3Following quenching the castings must be cooled below 500 F 260 C pr
30、ior to tempering.Grade Class AustenitizingTemperature,min, F CMedia TemperingTemperature,min, F CSC1020 65/35 1700 925 AA70/36 1700 925 A SC1025 65/35 1700 925 A 70/36 1700 925 A SC1030 65/35 1650 900 A 70/36 1650 900 A 1100 59580/40 1650 900 LA1100 59580/50 1650 900 L 1100 595SC1040 65/35B1650 900
31、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 65/35B1600 870 A 1150 62170/36B1600 870 A 1150 62180/40 1600 870 A 1150 62180/50 1600 870 A 1150 62190/60 1600 870 A 1100 595105/85 1600 870 A 1100 595115/95 1600 870 A 1050 565SC4130
32、 65/35B1650 900 A 1200 65070/36B1650 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 1650 900 L 1000 538135/125 1650 900 L 1000 538150/135 1650 900 L 1000 538SC4140 65/35B1600 870 A 1200 65070/3
33、6B1600 870 A 1200 65080/40B1600 870 A 1200 65080/50B1600 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 538135/125 1600 870 L 1000 535150/135 1600 870 L 950 510160/145 1600 870 L 950 510165/150 1600 870 L 950 510SC4330 65/35B16
34、50 870 A 1200 65070/36B1650 870 A 1200 65080/40B1650 870 A 1200 65080/50B1650 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 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
35、950 510210/180 1650 870 L 900 482SC4340 65/35B1600 870 A 1200 65070/36B1600 870 A 1200 65080/40B1600 870 A 1200 65080/50B1600 870 A 1150 620A958/A958M 1738.3 For all classes of Grades SC1020, SC1025, and SC1030,welds exceeding 20 % of the wall thickness or 1 in. 25 mm,whichever is smaller, or exceed
36、ing approximately 10 in.265 cm2 in area, shall be thermally stress-relieved or com-pletely reheat-treated. All other grades and classes shall bethermally stress-relieved or completely reheat-treated follow-ing any repair welds.9. Test Coupons and Specimens9.1 Test bars shall be poured from the same
37、heat, forinvestment castings, the same master heat, as the castingsrepresented.9.2 When the bar from which the test piece is taken is notheat treated as part of the same heat-treatment load as thecasting(s) it qualifies, the austenitizing temperatures for the barshall be within 25 F 15 C of those fo
38、r the casting(s). Thetempering temperature for the bar shall be no higher than 25 F15 C above that of the casting(s) and no higher than thatpermitted by the heat-treatment procedure for the material. Thecycle time at each temperature shall not exceed that for thecasting(s).9.3 Test specimens may be
39、cut from heat-treated castings atthe producers option, instead of from test bars.9.4 If the results of the mechanical tests for any heat or lotor casting do not conform to the requirements agreed upon,retests are permitted in accordance with the applicable com-mon requirements standard, either Speci
40、fication A781/A781Mor for investment castings, Specification A957/A957M, andtheir associated standards. At the manufacturers option, cast-ings may be reheat-treated and retested. Testing after reheat-treatment shall consist of the full number of specimens takenfrom locations complying with the speci
41、fication or order.TABLE 4 ContinuedGrade Class AustenitizingTemperature,min, F CMedia TemperingTemperature,min, F C90/60B1600 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 1600 870 L 1000 535150/135 1600 870 L 950 510160/145 1600 870 L 950
42、510165/150 1600 870 L 950 510210/180 1600 870 L 900 480SC8620 65/35B1700 925 A 1200 65070/36B1700 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 925 L 1050 565SC8625 65/35B1700 925 A 1200 65070/36B1700 925 A 1200 65
43、080/40 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 65/35B1650 900 A 1200 65070/36B1650 900 A 1200 65080/40 1650 900 A 1150 62080/50 1650 900 A 1150
44、 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 carbon levels of 0.33 % and higher may exhibit cracks when quenched in wate
45、r).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 174SUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall not apply unless specified in the purch
46、ase order. Alist of standardized supplementary requirements for use at the option of the purchaser are included inSpecifications A781/A781M and A957/A957M. Those which are ordinarily considered suitable foruse with this specification are given as follows together with additional supplementary requir
47、ementsthat are applicable only to this specification. Other supplementary requirements enumerated inSpecifications A781/A781M and A957/A957M may be used with this specification upon agreementbetween the manufacturer and the purchaser.S1. Magnetic Particle ExaminationS2. Radiographic ExaminationS4. U
48、ltrasonic ExaminationS5. Examination of Weld PreparationS6. CertificationS7. Prior Approval of Major Weld RepairsS8. MarkingS9. Charpy Impact TestS10. Hardness TestS12. Test ReportS13. Unspecified ElementsS14. Tension Test from CastingS15. Alternate Tension Test CouponsSUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A958/A958M 15) that may impact
