1、Designation: A958 09Standard Specification forSteel Castings, Carbon and Alloy, with TensileRequirements, Chemical Requirements Similar to StandardWrought Grades1This standard is issued under the fixed designation A958; the number immediately following the designation indicates the year oforiginal a
2、doption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers carbon and low-alloy steelcastings having
3、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 inch-pound units or SI unitsare to be regarded s
4、eparately as standard. Within the text, theSI units are shown in brackets. The values stated in eachsystem are not exact equivalents; therefore, each system mustbe used independently of the other. Combining values from thetwo systems may result in nonconformance with the standard.2. Referenced Docum
5、ents2.1 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 Industrial UseE29 Pract
6、ice 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 indicated in the purc
7、haseorder. 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 Information4.1 Orders f
8、or 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 included on thecasting drawi
9、ng.),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 multiple tempering is perm
10、itted.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 conform to the requir
11、ements 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 each heat and shallconfor
12、m 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 approved Oct. 1, 2009. Pu
13、blished October 2009. Originallyapproved in 1996. Last previous edition approved in 2006 as A958 00 (2006).DOI: 10.1520/A0958-09.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume informati
14、on, 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 shall be machined in accor
15、dancewith Paragraph 9 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 MPafor yield point an
16、d 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 used to inspect the casti
17、ngs. 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, weld repairs in which
18、 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.2(65cm2, shall be radiographed or ultrasonically tested, or both, tothe same standards that are us
19、ed 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 0.40/0.80 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
20、/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 - 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 0.0
21、40 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 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 0.6
22、0/1.00 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 90/60 105/85 115/95 130/115 135/125 150/135 160/145 165/150 210/180Tensile, ksiTensile, (MPa)65(450)70(485)80(550)80(550)90(620)105(725)115(795)130(895)135(930)150(1035)160(1105)165(11
23、40)210(1450)Yield, ksiYield, (MPa)35(240)36(250)40(275)50(345)60(415)85(585)95(655)115(795)125(860)135(930)145(1000)150(1035)180(1240)Elongation in 2in.or50mm,min, %42182181714197654Reduction ofArea, %35 30 30 35 35 35 30 25 22 18 12 10 8TABLE 3 Tensile Requirements/Grade SuitabilityClass 65/35 70/3
24、6 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 XBXBXBXBX X XSC 4340 XBXBXBXBXBXXXXXXXXSC 8620 XBXBXX XXSC 8625 XBXBX XXSC 8630 XBXBXX XX XA“X” de
25、notes 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 requirements do not imply that all section thicknesses will be through hardened.BThese grades significa
26、ntly exceed the minimum strength levels; therefore, they may be unsuitable for use due to weldability, and machinability issues.A958 092TABLE 4 Heat TreatmentNOTE 1The effect of section thickness should be considered in making grade selections. The heat treatment requirements do not imply that all s
27、ectionthicknesses 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 500F (260C) prior to tempering.Grade Class AustenitizingTemperature,min, F (C)Media Tempering Tem-perature, min,F
28、(C)SC1020 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 (595)80/40 1650 (900) LA1100 (595)80/50 1650 (900) L 1100 (595)SC1040 65/35B1650 (900) A 1150 (621)70/36 1650 (900) A 1150 (621)80/40 1650 (900) A 1150 (621)
29、80/50 1650 (900) A 1100 (595)90/60 1650 (900) A 1100 (595)SC1045 65/35B1600 (870) A 1150 (621)70/36B1600 (870) A 1150 (621)80/40 1600 (870) A 1150 (621)80/50 1600 (870) A 1150 (621)90/60 1600 (870) A 1100 (595)105/85 1600 (870) A 1100 (595)115/95 1600 (870) A 1050 (565)SC4130 65/35B1650 (900) A 1200
30、 (650)70/36B1650 (900) A 1200 (650)80/40 1650 (900) A 1200 (650)80/50 1650 (900) A 1200 (650)90/60 1650 (900) A or L 1150 (621)105/85 1650 (900) L 1100 (595)115/95 1650 (900) L 1100 (595)130/115 1650 (900) L 1000 (538)135/125 1650 (900) L 1000 (538)150/135 1650 (900) L 1000 (538)SC4140 65/35B1600 (8
31、70) A 1200 (650)70/36B1600 (870) A 1200 (650)80/40B1600 (870) A 1200 (650)80/50B1600 (870) A 1150 (621)90/60 1600 (870) A 1150 (621)105/85 1600 (870) A or L 1150 (621)115/95 1600 (870) L 1050 (566)130/115 1600 (870) L 1000 (538)135/125 1600 (870) L 1000 (535)150/135 1600 (870) L 950 (510)160/145 160
32、0 (870) L 950 (510)165/150 1600 (870) L 950 (510)SC4330 65/35B1650 (870) A 1200 (650)70/36B1650 (870) A 1200 (650)80/40B1650 (870) A 1200 (650)80/50B1650 (870) A 1200 (650)90/60 1650 (870) A or L 1150 (620)105/85 1650 (870) L 1100 (595)115/95 1650 (870) L 1100 (595)130/115 1650 (870) L 1000 (535)135
33、/125 1650 (870) L 1000 (535)150/135 1650 (870) L 1000 (535)160/145 1650 (870) L 950 (510)165/150 1650 (870) L 950 (510)210/180 1650 (870) L 900 (482)SC4340 65/35B1600 (870) A 1200 (650)70/36B1600 (870) A 1200 (650)80/40B1600 (870) A 1200 (650)80/50B1600 (870) A 1150 (620)A958 0938.3 For all classes
34、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.2(65cm2) in area, shall be thermally stress-relieved or completelyreheat-treated. All other grades and classes shall be thermallystress-relieved or
35、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 those shown in Fig.1 of Specification A781/A781M.9.2 The
36、 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 thecasting(s) it qualifies, the austenitizing temperatu
37、res for the barshall be within 25F of those for the casting(s). The temperingtemperature for the bar shall be no higher than 25F above thatof the casting(s) and no higher than that permitted by theheat-treatment procedure for the material. The cycle time ateach temperature shall not exceed that for
38、the casting(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 thesame heat.9.5 If the results of the mechanical tests for any h
39、eat 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-treatmentshall consist of the full number of specimens taken fr
40、omlocations complying with the specification or order.TABLE 4 ContinuedGrade Class AustenitizingTemperature,min, F (C)Media Tempering Tem-perature, min,F (C)90/60B1600 (870) A 1150 (620)105/85 1600 (870) A 1150 (620)115/95 1600 (870) A or L 1050 (565)130/115 1600 (870) L 1000 (535)135/125 1600 (870)
41、 L 1000 (535)150/135 1600 (870) L 950 (510)160/145 1600 (870) L 950 (510)165/150 1600 (870) L 950 (510)210/180 1600 (870) L 900 (480)SC8620 65/35B1700 (925) A 1200 (650)70/36B1700 (925) A 1200 (650)80/40 1700 (925) A 1150 (620)80/50 1700 (925) A or L 1150 (620)90/60 1700 (925) L 1150 (620)105/85 170
42、0 (925) L 1100 (595)115/95 1700 (925) L 1050 (565)SC8625 65/35B1700 (925) A 1200 (650)70/36B1700 (925) A 1200 (650)80/40 1700 (925) A or L 1150 (620)80/50 1700 (925) A or L 1150 (620)90/60 1700 (925) A or L 1150 (620)105/85 1700 (925) L 1100 (595)115/95 1700 (925) L 1100 (595)130/115 1700 (925) L 11
43、00 (595)135/125 1700 (925) L 1050 (565)SC8630 65/35B1650 (900) A 1200 (650)70/36B1650 (900) A 1200 (650)80/40 1650 (900) A 1150 (620)80/50 1650 (900) A 1150 (620)90/60 1650 (900) A or L 1150 (620)105/85 1650 (900) L 1100 (595)115/95 1650 (900) L 1100 (595)130/115 1650 (900) L 1100 (595)135/125 1650
44、(900) L 1050 (565)150/135 1650 (900) L 1050 (565)AA = air cool (normalize).L = Liquid 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 experience
45、d when trying to produce castings to low hardnessvalues.A958 094SUPPLEMENTARY 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 inSpecificati
46、on A781/A781M. Those which are ordinarily considered suitable for use with 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
47、 this specification upon agreement between the manufacturer and thepurchaser.S1. Magnetic Particle ExaminationS2. Radiographic ExaminationS4. Ultrasonic ExaminationS5. Examination of Weld PreparationS6. CertificationS7. Prior Approval of Major Weld RepairsS8. MarkingS9. Charpy Impact TestS10. Hardne
48、ss 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 (A95800(2006) that may impact the use of this standard. (Approved Oct
49、. 1, 2009.)(1) Revised 1.4. (2) Revised Table 3, Note B.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or w
