1、Designation: A958/A958M 10Standard 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 non-conformancewith the standard.1.4.1 Within the text, the SI units are shown in bracke
5、ts.2. Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA488/A488M Practice for Steel Castings, Welding, Quali-fications of Procedures and PersonnelA781/A781M Specification for Castings, Steel and Alloy,Common Requirements, for General I
6、ndustrial UseE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications3. General Conditions for Delivery3.1 Material furnished to this specification shall conform tothe requirements of Specification A781/A781M, including anysupplementary requirements that are
7、 indicated in the purchaseorder. Failure 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.4. Ordering I
8、nformation4.1 Orders for material under this specification shouldinclude 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,4.1.4 Description of the casting by pattern number ordrawing (Dimensional tolerances should be includ
9、ed 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 All castings shall receive a heat treatment indicated inTable 4. Preliminary heat treatment prior to final heat treatmentas well as mult
10、iple tempering is permitted.5.2 Heat treatment shall be performed after the castingshave been allowed to cool below the transformation range.5.3 The furnace temperature for heat treating shall beeffectively controlled by the use of recording-type pyrometers.6. Chemical Composition6.1 The steel shall
11、 conform to the requirements of chemicalcomposition as prescribed in Table 1.6.2 The product analysis tolerances given in SpecificationA781/A781M shall apply to all product analyses performed oncastings supplied to this specification.7. Tensile Requirements7.1 One tension test shall be made from eac
12、h heat and shallconform to the tensile requirements specified for the gradeselected in Tables 2 and 3.1This specification is under 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 app
13、roved April 1, 2010. Published April 2010. Originallyapproved in 1996. Last previous edition approved in 2009 as A958 091. DOI:10.1520/A0958_A0958M-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStan
14、dards 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, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.2 Tension test coupons shal
15、l be machined in accordancewith Paragraph 8 of Test Methods and Definitions A370 andtested in accordance with those methods.7.3 To determine conformance with the tension test require-ments, an observed value or calculated value shall be roundedin accordance with Practice E29 to the nearest 500 psi 5
16、 MPafor 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 weldersqualified in accordance with Practice A488/A488M.8.2 Repair welds shall be inspected to the same qualitystandards that are use
17、d 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 that are used to inspect the castings.When castings are produced with Supplementary S2 or S4, orboth, as specified,
18、 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 is greater than approximately 10 in.265cm2, shall be radiographed or ultrasonically tested, or both, tothe same st
19、andards that are used to inspect the castings.8.3 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 exceeding approximately 10 in.265cm2 in area, shall be thermally stress-relieved or completelyTABLE 1 Chemical Com
20、position, Weight PercentNOTE 1Values are maximum unless a range is given.Grade C Mn P S Si Ni Cr MoSC 1020 0.18/0.23 0.40/0.80 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.
21、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 - 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 43
22、40 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 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 0.40/0.6
23、0 0.15/0.25TABLE 2 Tensile RequirementsClass 65/35 70/36 80/40 80/50 90/60 105/85 115/95 130/115 135/125 150/135 160/145 165/150 210/180Tensile, ksiTensile, min.(MPa)65450704858055080550906201057251157951308951359301501035160110516511402101450Yield, ksiYield, min.(MPa)3524036250402755034560415855859
24、5655115795125860135930145100015010351801240Elongation in 2in.or50mm,min, %42182181714197654Reduction ofArea, 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 90/60 105/85 115/95 130/115 135/125 150/135 160/145 165/150 210/180Grade
25、SC 1020 XAXSC 1025 X XSC 1030 X X X XSC 1040 XBXX XSC 1045 XBXBXX XXSC 4130 XBXBX XXXSC 4140 XBXBXBXBXX XXXXSC 4330 XBXBXBXBX 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 refer
26、enced in 5. The 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
27、 to weldability, and machinability issues.A958/A958M 102TABLE 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 b
28、e at or below the final tempering temperature.NOTE 3Following quenching the castings must be cooled below 500F 260C prior to tempering.Grade Class AustenitizingTemperature,min, F CMedia Tempering Tem-perature, min,F CSC1020 65/35 1700 925 AA70/36 1700 925 A SC1025 65/35 1700 925 A 70/36 1700 925 A S
29、C1030 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 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 87
30、0 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 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
31、595130/115 1650 900 L 1000 538135/125 1650 900 L 1000 538150/135 1650 900 L 1000 538SC4140 65/35B1600 870 A 1200 65070/36B1600 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 538
32、135/125 1600 870 L 1000 535150/135 1600 870 L 950 510160/145 1600 870 L 950 510165/150 1600 870 L 950 510SC4330 65/35B1650 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 595130/11
33、5 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 65/35B1600 870 A 1200 65070/36B1600 870 A 1200 65080/40B1600 870 A 1200 65080/50B1600 870 A 1150 620A958/A958M 103reheat-treated. All other
34、grades and classes shall be thermallystress-relieved or completely reheat-treated following anyrepair welds.9. Test Coupons and Specimens9.1 Test bars shall be poured from the same heat as thecastings represented. Test coupons may be cast integrally withthe castings or as separate blocks similar to
35、those shown in Fig.1 of Specification A781/A781M.9.2 The bar from which the test piece is taken shall beheat-treated in production furnaces to the same procedure asthe castings it represents.When the bar from which the test piece is taken is notheat-treated as part of the same heat-treatment load as
36、 thecasting(s) it qualifies, the austenitizing temperatures for the barshall be within 25F 15C of those for the casting(s). Thetempering temperature for the bar shall be no higher than 25F15C above that of the casting(s) and no higher than thatpermitted by the heat-treatment procedure for the materi
37、al. Thecycle time at each temperature shall not exceed that for thecasting(s).9.3 Test specimens may be cut from heat-treated castings atthe producers option, instead of from test bars.9.4 If any specimen shows defective machining or exhibitsflaws, it may be discarded and another substituted from th
38、esame heat.9.5 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 Test Methods andDefinitions A370. At the manufacturers option, castings maybe reheat-treated and retested. Testing after reheat-
39、treatmentshall consist of the full number of specimens taken fromlocations complying with the specification or order.TABLE 4 ContinuedGrade Class AustenitizingTemperature,min, F CMedia Tempering Tem-perature, min,F C90/60B1600 870 A 1150 620105/85 1600 870 A 1150 620115/95 1600 870 A or L 1050 56513
40、0/115 1600 870 L 1000 535135/125 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 65/35B1700 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
41、1700 925 L 1100 595115/95 1700 925 L 1050 565SC8625 65/35B1700 925 A 1200 65070/36B1700 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 565SC
42、8630 65/35B1650 900 A 1200 65070/36B1650 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 = Li
43、quid quench. (Steels with carbon 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 104SUPPLEMENTA
44、RY 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
45、thisspecification are given as follows together with additional supplementary requirements that areapplicable only to this specification. Other supplementary requirements enumerated in SpecificationA781/A781M may be used with this specification upon agreement between the manufacturer and thepurchase
46、r.S1. Magnetic Particle ExaminationS2. Radiographic ExaminationS4. Ultrasonic 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 Cast
47、ingS15. Alternate Tension Test CouponsSUMMARY OF CHANGESCommitteeA01 has identified the location of selected changes to this standard since the last issue (A958091)that may impact the use of this standard. (Approved April 1, 2010.)(1) Specification designation changed to A958/A958M.(2) 7.2, Referenc
48、e paragraph to A370 changed.(3) 8.2, 8.3, Table 2, Table 4, parentheses replaced by brackets.(4) 9.2, Centigrade equivalents of specified Fahrenheit tem-peratures included.Committee A01 has identified the location of selected changes to this standard since the last issue (A95800(2006) that may impact the use of this standard. (Approved Oct. 1, 2009.)(1) Revised 1.4. (2) Revised Table 3, Note B.ASTM Internation
