1、Designation: A732/A732M 09A732/A732M 14Standard Specification forCastings, Investment, Carbon and Low Alloy Steel forGeneral Application, and Cobalt Alloy for High Strength atElevated Temperatures1This standard is issued under the fixed designation A732/A732M; the number immediately following the de
2、signation indicates 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 c
3、arbon and low-alloy steel and cobalt alloy castings made by the investment casting process.1.2 Fifteen grades of steel and two cobalt alloy grades are covered.1.3 Supplementary requirements of an optional nature are provided for use at the option of the purchaser. The supplementaryrequirements shall
4、 apply only when specified individually by the purchaser in the purchase order or contract.1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in eachsystem may not be exact equivalents; therefore, each system shall be used indepe
5、ndently of the other. Combining values from thetwo systems may result in non-conformance with the standard.2. Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testing of Steel ProductsA941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Fer
6、roalloysA957A957/A957M Specification for Investment Castings, Steel and Alloy, Common Requirements, for General Industrial UseA994 Guide for Editorial Procedures and Form of Product Specifications for Steel, Stainless Steel, and Related AlloysA997 Practice for Investment Castings, Surface Acceptance
7、 Standards, Visual ExaminationE21 Test Methods for Elevated Temperature Tension Tests of Metallic MaterialsE139 Test Methods for Conducting Creep, Creep-Rupture, and Stress-Rupture Tests of Metallic Materials3. Ordering Information3.1 Orders for castings under this specification should include the f
8、ollowing information:3.1.1 Quantity,3.1.2 ASTM designation and issue date,3.1.3 Grade designation (Tables 1 and 2), and3.1.4 Description of casting by part, pattern, or drawing number. (Dimensional tolerances and machined surfaces shall beindicated on the casting drawing.).3.2 The purchaser should s
9、pecify any of the following information to describe adequately the desired material:3.2.1 Heat-treat condition (see 5.1 and 5.2),3.2.2 Repair welding (see Section 8 and Specification A957A957/A957M),3.2.3 Source inspection, if any (see Specification A957A957/A957M), and3.2.4 Supplementary requiremen
10、ts required (marking, certification, mechanical properties, NDT, and the like).4. General Requirements4.1 Material furnished to this specification shall conform to the requirements of Specification A957A957/A957M, including anysupplementary requirements that are indicated on the purchase order. Fail
11、ure to comply with the requirements of Specification1 This specification is under the jurisdiction ofASTM committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.18on Castings.Current edition approved April 1, 2009March 1, 2014. Published May 20
12、09March 2014. Originally approved in 1976. Last previous edition approved in 20052009 asA732/A732M 05.A732/A732M 09. DOI: 10.1520/A0732_A0732M-09.10.1520/A0732_A0732M-14.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annua
13、l Book of ASTM Standardsvolume information, refer to the standards Document Summary page on 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 t
14、echnically possible to adequately depict all changes accurately, ASTM recommends that users 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 t
15、his standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1A957A957/A957M constitutes nonconformance with this specification. In case of conflict of this specification and SpecificationA957A957/A957M, this specification shall prevail
16、.5. Heat Treatment5.1 Steel castings shall be heat treated either by full annealing, normalizing, normalizing and tempering, or quenching andtempering to obtain the specified properties or other properties that have been agreed upon within each grade. In this latter instance,Supplementary Requiremen
17、t S23S53 shall be used.5.1.1 Heat treatment shall be performed after the castings have been allowed to cool below the transformation range.TABLE 1 Chemical RequirementsGrade 1A 2A,2Q 3A,3Q 4A,4Q 5N 6N 7Q 8QType Low CarbonIC 1020AMediumCarbonIC 1030MediumCarbonIC 1040MediumCarbonIC 1050VanadiumIC 612
18、0ManganeseMolybdenumIC 4020ChromiumMolybdenumIC 4130ChromiumMolybdenumIC 4140Carbon 0.15 to 0.25 0.25 to 0.35 0.35 to 0.45 0.45 to 0.55 0.30 max 0.35 max 0.25 to 0.35 0.35 to 0.45Manganese 0.20 to 0.60 0.70 to 1.00 0.70 to 1.00 0.70 to 1.00 0.70 to 1.00 1.35 to 1.75 0.40 to 0.70 0.70 to 1.00Phosphor
19、us, max 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04Sulfur, max 0.045 0.045 0.045 0.045 0.045 0.045 0.045 0.045Silicon 0.20 to 1.00 0.20 to 1.00 0.20 to 1.00 0.20 to 1.00 0.20 to 0.80 0.20 to 0.80 0.20 to 0.80 0.20 to 0.80NickelChromium 0.80 to 1.10 0.80 to 1.10Molybdenum 0.25 to 0.55 0.15 to 0.25 0.15 t
20、o 0.25Vanadium 0.05 to 0.15Residual Elements:Copper 0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.50Nickel 0.50 0.50 0.50 0.50 0.50 0.50Chromium 0.35 0.35 0.35 0.35 0.35Molybdenum + Tungsten 0.25 0.25Tungsten 0.10 0.10 0.10 0.25 0.10 0.10Total content of theseresidual elements1.00 1.00 1.00 0.60 1.00 1.00 0.
21、60 1.00Grade 9Q 10Q 11Q 12Q 13Q 14Q 15AType Chrome NickelMolybdenumIC 4330Chrome NickelMolybdenumIC 4340Nickel Molyb-denumIC 4620ChromiumVanadiumIC 6150Chrome NickelMolybdenumIC 8620Chrome NickelMolybdenumIC 8630ChromiumIC 52100Carbon 0.25 to 0.35 0.35 to 0.45 0.15 to 0.25 0.45 to 0.55 0.15 to 0.25
22、0.25 to 0.35 0.95 to 1.10Manganese 0.40 to 0.70 0.70 to 1.00 0.40 to 0.70 0.65 to 0.95 0.65 to 0.95 0.65 to 0.95 0.25 to 0.55Phosphorus, max 0.04 0.04 0.04 0.04 0.04 0.04 0.04Sulfur, max 0.045 0.045 0.045 0.045 0.045 0.045 0.045Silicon 0.20 to 0.80 0.20 to 0.80 0.20 to 0.80 0.20 to 0.80 0.20 to 0.80
23、 0.20 to 0.80 0.20 to 0.80Nickel 1.65 to 2.00 1.65 to 2.00 1.65 to 2.00 0.40 to 0.70 0.40 to 0.70Chromium 0.70 to 0.90 0.70 to 0.90 0.80 to 1.10 0.40 to 0.70 0.40 to 0.70 1.30 to 1.60Molybdenum 0.20 to 0.30 0.20 to 0.30 0.20 to 0.30 0.15 to 0.25 0.15 to 0.25Vanadium 0.15 minResidual Elements:Copper
24、0.50 0.50 0.50 0.50 0.50 0.50 0.50Nickel 0.50 0.50Chromium 0.35Molybdenum + Tungsten 0.10Tungsten 0.10 0.10 0.10 0.10 0.10 0.10Total content of theseresidual elements0.60 1.00 1.00 1.00 1.00 1.00 0.60A Investment Casting (IC) numbers are to be used only for nomenclature comparison.TABLE 2 Chemical R
25、equirements-Cobalt AlloysGrade 21 31Carbon 0.200.30 0.450.55Manganese, max. 1.00 1.00Silicon, max 1.00 1.00Phosphorus, max 0.040 0.040Sulfur, max 0.040 0.040Chromium 25.029.0 24.526.5Nickel 1.73.8 9.511.5Cobalt remainder remainderMolybdenum 5.06.0 .Tungsten . 7.08.0Iron, max. 3.00 2.00Boron 0.007 ma
26、x 0.0050.015A732/A732M 1425.2 Cobalt alloy castings shall be supplied in the as-cast condition unless otherwise agreed upon by supplier and purchaser.5.3 Definitions of terms relating to heat treatment shall be in accordance with Terminology A941.6. Chemical Composition6.1 The castings shall conform
27、 to the requirements for chemical composition specified in Table 1 and Table 2.7. Quality7.1 The surface of the casting shall be examined visually to meet the requirements of Practice A997. Acceptance criteria to bemutually agreed upon between supplier and purchaser.7.2 The castings shall not be pee
28、ned or plugged or impregnated.8. Repair by Welding8.1 Welding shall be accomplished with a filler metal that produces a weld deposit with a chemical composition similar to thecasting. Castings ordered in the annealed condition or for subsequent hardening shall be annealed after weld repairs. Casting
29、sordered heat treated shall be post weld heat treated in accordance with the qualified welding procedure after weld repairs with theexception of Grades 1A and 2A where post weld heat treatment is optional.8.2 Welds shall be subject to the same quality standards as used to inspect the castings.9. Key
30、words9.1 alloy steel; carbon steel; cobalt alloys; investment castings; steel castingsSUPPLEMENTARY 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 i
31、ncluded inSpecification A957A957/A957M. Those ordinarily considered suitable for use with this specificationare given below, together with additional supplementary requirements that are applicable only to thisspecification. Other supplementary requirements enumerated in Specification A957A957/A957M
32、maybe used with this specification upon agreement between supplier and purchaser.S1. Magnetic Particle InspectionS2. Radiographic InspectionS3. Liquid Penetrant InspectionS6. CertificationS7. Prior Approval of Major Weld RepairsS8. MarkingS10. Hardness TestS10.1 Hardness measurements at specified lo
33、cations of the castings shall be made in accordance with Test Methods andDefinitions A370 and reported.A732/A732M 143S13. Unspecified ElementsS16. Weld Repair ChartsS22. DecarburizationS53. Mechanical PropertiesS23.1 MechanicalS53.1 Mechanical properties other than those specified in Table S24.1S54.
34、1 may be ordered for each of thegrades. The properties shall be agreed upon between the supplier and the purchaser.S54. Tension Test (Castings Heat Treated by Supplier)S24.1 TensileS54.1 Tensile properties shall be determined from cast material representing each master heat or sub heat. Theresults s
35、hall conform to the requirements specified in Table S24.1S54.1, or to properties agreed upon, and shall be reported to thepurchaser or his representative. See Specification A957A957/A957M for detailed testing requirements of master heats and subheats.S55. Tension Test (Castings Heat Treated by Purch
36、aser)S25.1 TheS55.1 The supplier shall heat treat a tension specimen of cast material from the same master heat or sub heat todetermine whether the castings are capable of being heat treated to the specified properties. The results shall conform to therequirements specified in Table S24.1S54.1, or t
37、o properties agreed upon, and shall be reported to the purchaser or hisrepresentative. See Specification A957A957/A957M for detailed testing requirements of master heats and sub heats.S56. High Temperature Tension TestS26.1 High-temperatureS56.1 High-temperature tension tests of cast material from t
38、he same master heat or sub heat shall berequired when specified in the inquiry, contract, or order. When so specified, the properties obtained shall be reported to thepurchaser or his representative and shall conform to the requirements prescribed in Table S26.1S56.1. The tension test shall beperfor
39、med in accordance with Test Methods E21. See Specification A957A957/A957M for detailed testing requirements of masterheats and sub heats.TABLE S24.1S54.1 Tensile RequirementsGrade Tensile strength, min Yield strength, min Elongation, in 2-in.50-mm or 4diametersHeatTreatmentksi MPa ksi MPa1A 60 414 4
40、0 276 24 AA2A 65 448 45 310 25 A2Q 85 586 60 414 10 Q TB3A 75 517 48 331 25 A3Q 100 689 90 621 10 Q T4A 90 621 50 345 20 A4Q 125 862 100 689 5 Q T5N 85 586 55 379 22 N TC6N 90 621 60 414 20 N T7Q 150 1030 115 793 7 Q T8Q 180 1241 145 1000 5 Q T9Q 150 1030 115 793 7 Q T10Q 180 1241 145 1000 5 Q T11 1
41、20 827 100 689 10 Q T12Q 190 1310 170 1172 4 Q T13Q 105 724 85 586 10 Q T14Q 150 1030 115 793 7 Q T15AD . . . . . AA Annealed.B Quenched and tempered.C Normalized and tempered.D Hardness Rockwell B, 100 max.A732/A732M 144S57. Stress Rupture TestS27.1 StressS57.1 Stress rupture tests of cast material
42、 from the same master heat or sub heat shall be required when specifiedin the inquiry, contract, or order. When so specified, the properties obtained shall be reported to the purchaser or his representativeand shall conform to the requirements prescribed in Table S27.1S57.1. The stress rupture test
43、shall be performed in accordancewith Practice E139. See Specification A957A957/A957M for detailed testing requirements of master heats and sub heats.APPENDIX(Nonmandatory Information)X1. GUIDE TO CLASSIFICATION OF COBALT ALLOY CASTINGSX1.1 This guide is appended to the specification as a source of i
44、nformation; it is not mandatory and does not form a part of thespecification.X1.1.1 This specification itself is intended to provide both the manufacturer and the purchaser of alloy castings with a means ofproduction control on the basis of acceptance through mutually acceptable, sound, standard req
45、uirements.X1.1.2 This guide has been prepared as an aid to prospective users of alloy castings covered by the specification in determiningthe classification best suited for a particular application with due consideration to the particular requirements for that application.X1.2 Stress for DesignThe o
46、ld method of basing design calculations on 50 % of the limiting creep stress is conservative, butit is relatively crude and has the disadvantage that the resulting stress values do not have a consistent relation to life expectancy.Design with the stress that should produce rupture in 100 000 h is fr
47、equently satisfactory, though it should be recognized that thisis an extrapolated value and provides no assurance that the installation will actually endure for this time. Among the factors thatcan result in shorter life are reduction of the effective cross-sectional area by hot-gas corrosion, therm
48、al stresses superimposed onthe normal working stresses, and overheating. Usually overheating is the most serious of these, since in general a 200F 110Cincrease in temperature will cut the rupture strength in half.X1.3 Grade 21 (Cobalt-base27 % Cr, 5.5 % Mo, 2.8 % Ni):X1.3.1 This grade is resistant t
49、o oxidizing and reducing atmospheres at temperatures up to 2100F 1150C. The alloy has goodstrength at elevated temperatures and is used in many applications where resistance to thermal shock is important. The alloy canbe produced as sand, shell, or investment castings.TABLE S26.1S56.1 Elevated-Temperature Tensile RequirementsGrade 21 31Condition as cast as castTest temperature:F 1500 1500C 820 820Tensile strength, min:ksi 52.0 55.0MPa 360 380Elongation in 4D, min , % 10 10TABLE S27
