1、Designation: A958/A958M 14A958/A958M 15Standard 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 UseA1067/A1067M Specification for Test Coupons for Steel CastingsE29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specif
7、ications3. General Conditions for Delivery3.1 Material furnished 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
8、/A781M constitutes nonconformance with this specification. In 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
9、 A957/A957M,including any supplementary requirements that are 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 Specific
10、ation A957/A957M, Specification A957/A957M shall prevail.4. Ordering 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
11、the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.18on Castings.Current edition approved March 1, 2014Dec. 1, 2015. Published March 2014December 2015. Originally approved in 1996. Last previous edition approved in 2
12、0102014as A958 10.A958 14. DOI: 10.1520/A0958_A0958M-14.10.1520/A0958_A0958M-15.2 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 o
13、n the ASTM website.This document is not an ASTM standard and is 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 user
14、s consult prior editions as appropriate. In all cases only the 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 Conshoh
15、ocken, PA 19428-2959. United States14.1.4 Description of the casting 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
16、 All castings shall receive a heat treatment indicated in Table 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 temp
17、erature for heat treating shall be effectively controlled by the 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 rang
18、e 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 0.040 0.30/0.60 - - -SC 1045 0.43/0.50 0.50/0.90 0.040 0.040 0.3
19、0/0.60 - - -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 4340 0.38/0.43 0.60/0.90 0.035 0.040 0.30/0.60 1.65/2.00 0.70/0.
20、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 0.40/0.60 0.15/0.25TABLE 2 Tensile RequirementsClass 65/35 70/36 80/40
21、 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)35240362504027550345604158558595655115795125860135930145100015010351801240Elongation in 2in.
22、or 50 mm,min, %24 22 18 22 18 17 14 11 9 7 6 5 4Reduction 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 90/60 105/85 115/95 130/115 135/125 150/135 160/145 165/150 210/180GradeSC 1020 XA XSC 1025 X XSC 1030 X X X XSC 10
23、40 XB X X X XSC 1045 XB XB X X X X XSC 4130 XB XB X X X X X X 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 achie
24、ved 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.B These grades significantly exceed the minimum strength leve
25、ls; therefore, they may be unsuitable for use due to weldability, and machinability issues.A958/A958M 152TABLE 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 throu
26、gh 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 CMedia TemperingTemperature,min, F CSC1020 65/35 1700 925 AA 70/36 1700
27、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 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 8
28、70 A 1150 62170/36B 1600 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 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 115
29、0 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 65/35B 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 115
30、0 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 65/35B 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
31、 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 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 650
32、80/50B 1600 870 A 1150 620A958/A958M 1536.2 The product analysis tolerances given in Specification A781/A781M, or for investment castings, Specification A957/A957M, shall apply to all product analyses performed on castings supplied to this specification.7. Tensile Requirements7.1 One tension test sh
33、all be made from each heat heat, for investment castings, each master heat, and shall conform to thetensile requirements specified for the grade selected in Tables 2 and 3.7.2 Tension test coupons shall be machined in accordance with Paragraph 8 of Test Methods and Definitions A370 and testedin acco
34、rdance with those methods.7.2 To determine conformance with the tension test requirements, an observed value or calculated value shall be rounded inaccordance with Practice E29 to the nearest 500 psi 5 MPa for yield point and tensile strength and to the nearest 1 % forelongation and reduction of are
35、a.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 same quality standards that are used to inspect the castings. When castings areproduced with Supplementary Requirement S1 specified
36、, weld repairs shall be inspected by magnetic particle examination to thesame standards that are used to inspect the castings. When castings are produced with Supplementary S2 or S4, or both, asspecified, weld repairs in which the depth of the cavity prepared for weld repair exceeds 20 % of the wall
37、 thickness or 1 in. 25mm, whichever is smaller, or in which the cavity prepared for welding is greater than approximately 10 in.2 65 cm65 cm2, shallbe radiographed or ultrasonically tested, or both, to the same standards that are used to inspect the castings.TABLE 4 ContinuedGrade Class Austenitizin
38、gTemperature,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 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 480SC8
39、620 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 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 1
40、150 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 65070/36B 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
41、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 565A A = air cool (normalize).L = Liquid quench. (Steels with carbon levels of 0.33 % and higher may exhibit cracks when quenched in water).B These grades are likely to significantly excee
42、d the minimum strength levels, therefore, problems may be experienced when trying to produce castings to low hardnessvalues.A958/A958M 1548.3 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 approximate
43、ly 10 in. 2 65 cm65 cm2 in area, shall be thermally stress-relieved or completelyreheat-treated. All other grades and classes shall be thermally stress-relieved or completely reheat-treated following any repairwelds.9. Test Coupons and Specimens9.1 Test bars shall be poured from the same heat heat,
44、for investment castings, the same master heat, as the castings represented.Test coupons may be cast integrally with the castings or as separate blocks similar to those shown in Fig. 1 of SpecificationA781/A781MA1067/A1067M.9.2 The bar from which the test piece is taken shall be heat-treated in produ
45、ction 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 bar shall be within 25F 15C of those for the casting(s).
46、 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 the casting(s).9.3 Test specimens may be cut from heat-tr
47、eated 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.9.4 If the results of the mechanical tests for any heat or lot or casting do not conform to the requirement
48、s agreed upon, retestsare permitted in accordance with Test Methods and Definitions the applicable common requirements standard, either SpecificationA370A781/A781M. or for investment castings, Specification A957/A957M, and their associated standards. At the manufacturersoption, castings may be reheat-treated and retested. Testing after reheat-treatment shall consist of the full number of specimenstaken from l
