1、Designation: A 958 00 (Reapproved 2006)Standard Specification forSteel Castings, Carbon and Alloy, with TensileRequirements, Chemical Requirements Similar to StandardWrought Grades1This standard is issued under the fixed designation A 958; the number immediately following the designation indicates t
2、he year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers carbon and low-alloy s
3、teelcastings 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 inch-pound units or SI units
4、are to be regarded separately 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 specific
5、a-tion. Inch-pound units are applicable for material ordered toSpecification A 958 and SI units for material ordered toSpecification A 958.2. Referenced Documents2.1 ASTM Standards:2A 370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA 488/A 488M Practice for Steel Castings, We
6、lding, Quali-fication of Procedures and PersonnelA 781/A 781M Specification for Castings, Steel and Alloy,Common Requirements, for General Industrial UseE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications3. General Conditions for Delivery3.1 Material fu
7、rnished to this specification shall conform tothe requirements of Specification A 781/A 781M, includingany supplementary requirements that are indicated in thepurchase order. Failure to comply with the general require-ments of Specification A 781/A 781M constitutes nonconfor-mance with this specific
8、ation. In case of conflict between therequirements of this specification and Specification A 781/A 781M, this specification shall prevail.4. Ordering Information4.1 Orders for material under this specification shouldinclude the following information.4.1.1 Quantity,4.1.2 Specification, including year
9、 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 drawing.),4.1.5 Options in the specification, and4.1.6 Supplementary requirements desired, including stan-dards of acceptance.5. Hea
10、t 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 permitted.5.2 Heat treatment shall be performed after the castingshave been allowed to cool below the transformation range.5.3 The
11、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 requirements of chemicalcomposition as prescribed in Table 1.6.2 The product analysis tolerances given in SpecificationA 781/A 781M s
12、hall apply to all product analyses performedon castings supplied to this specification.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 March 1,
13、2006. Published March 2006. Originallyapproved in 1996. Last previous edition approved in 2000 as A 958 00.2For 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 stand
14、ards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7. Tensile Requirements7.1 One tension test shall be made from each heat and shallconform to the tensile requirements specified for the gra
15、deselected in Tables 2 and 3.7.2 Tension test coupons shall be machined in accordancewith Paragraph 9 of Test Methods and Definitions A 370 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 roun
16、dedin accordance with Practice E29to the nearest 500 psi 5 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 A 488/A 488M.8.2 Repair welds
17、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 that are used to inspect the castings.When castings are
18、 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 is greater than approximately 10 in.2(65cm2, shall b
19、e radiographed or ultrasonically tested, or both, tothe same standards 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.2(65cm2) in area, s
20、hall be thermally stress-relieved or completelyTABLE 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
21、.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 - 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
22、 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 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 0.15/0.25S
23、C 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 90/60 105/85 115/95 130/115 135/125 150/135 160/145 165/150 210/180Tensile, ksiTensile, (MPa)65(450)70(485)80(550)80(550)90(620)105(725)115(795)130(895)135(930)150(
24、1035)160(1105)165(1140)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 Suitabi
25、lityClass 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 XBXBXBXBX X XSC 4340 XBXBXBXBXBXXXXXXXXSC 8620 XBXBXX XXSC 8625 XBXBX XXSC 863
26、0 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 requirements do not imply that all section thicknesses will be through hardened.BTh
27、ese grades are likely to significantly exceed the minimum strength levels, therefore, problems may be experienced when trying to produce castings to low hardnessvalues.A 958 00 (2006)2TABLE 4 Heat TreatmentNOTE 1The effect of section thickness should be considered in making grade selections. The hea
28、t 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 500F (260C) prior to tempering.Grade Class AustenitizingTemperatur
29、e,min, F (C)Media Tempering Tem-perature, min,F (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
30、 (900) A 1150 (621)80/40 1650 (900) A 1150 (621)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
31、(870) A 1050 (565)SC4130 65/35B1650 (900) A 1200 (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
32、/135 1650 (900) L 1000 (538)SC4140 65/35B1600 (870) 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 100
33、0 (535)150/135 1600 (870) L 950 (510)160/145 1600 (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
34、) L 1100 (595)130/115 1650 (870) L 1000 (535)135/125 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)80/50B160
35、0 (870) A 1150 (620)A 958 00 (2006)3reheat-treated. All other 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
36、 integrally withthe castings or as separate blocks similar to those shown in Fig.1 of Specification A 781/A 781M.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 tak
37、en is notheat-treated as part of the same heat-treatment load as thecasting(s) it qualifies, the austenitizing temperatures 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
38、 permitted by theheat-treatment procedure for the material. The cycle time ateach temperature shall not exceed that for 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 exhibitsf
39、laws, it may be discarded and another substituted from thesame 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 A 370. At the manufacturers option, casting
40、s maybe reheat-treated and retested. Testing after reheat-treatmentshall consist of the full number of specimens taken fromlocations 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 115
41、0 (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) 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
42、 (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 1700 (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 (
43、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 1100 (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)
44、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 (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 w
45、ater).BThese grades are likely to significantly exceed the minimum strength levels, therefore, problems may be experienced when trying to produce castings to low hardnessvalues.A 958 00 (2006)4SUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall not apply unless specified in the
46、purchase order. Alist of standardized supplementary requirements for use at the option of the purchaser is included inSpecification A 781/A 781M. Those which are ordinarily considered suitable for use with thisspecification are given as follows together with additional supplementary requirements tha
47、t areapplicable only to this specification. Other supplementary requirements enumerated in SpecificationA 781/A 781M may be used with this specification upon agreement between the manufacturer and thepurchaser.S1. Magnetic Particle ExaminationS2. Radiographic ExaminationS4. Ultrasonic ExaminationS5.
48、 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 CouponsASTM International takes no position respecting the va
49、lidity 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 withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be
