1、Designation: A747/A747M 16Standard Specification forSteel Castings, Stainless, Precipitation Hardening1This standard is issued under the fixed designation A747/A747M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last
2、 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 iron-chromium-nickel-coppercorrosion-resistant steel castings, capable of being strength-ened b
3、y precipitation hardening heat treatment.1.2 These castings may be used in services requiring corro-sion resistance and high strengths at temperatures up to 600F315C. They may be machined in the solution-annealedcondition and subsequently precipitation hardened to the de-sired high-strength mechanic
4、al properties specified in TableS14.1 with little danger of cracking or distortion.1.3 The material is not intended for use in the solution-annealed condition.NOTE 1If the service environment in which the material is to be usedis considered conducive to stress-corrosion cracking, precipitation hard-
5、ening should be performed at a temperature that will minimize thesusceptibility of the material to this type of attack.1.4 Supplementary requirements of an optional nature areprovided for use at the option of the purchaser. The Supple-mentary requirements shall apply only when specified indi-viduall
6、y by the purchaser in the purchase order or contract.1.5 This specification is expressed in both inch-pound unitsand in SI units; however, unless the purchase order or contractspecifies the applicable M specification designation (SI units),the inch-pound units shall apply.1.6 The values stated in ei
7、ther SI units or inch-pound unitsare to be 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.1.6.1 Within t
8、he text, the SI units are shown in brackets.2. Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA781/A781M Specification for Castings, Steel and Alloy,Common Requirements, for General Industrial UseA957/A957M Specification for Investmen
9、t Castings, Steeland Alloy, Common Requirements, for General IndustrialUseA1080 Practice for Hot Isostatic Pressing of Steel, StainlessSteel, and Related Alloy Castings2.2 ASME Standard:3ASME Boiler and Pressure Vessel Code, SupplementaryRequirements Section II, Part A3. General Conditions for Deliv
10、ery3.1 Except for investment castings, castings furnished tothis specification shall be in accordance with the requirementsof Specification A781/A781M, including any supplementaryrequirements that are indicated in the purchase order. Failure tocomply with the general requirements of Specification A7
11、81/A781M constitutes nonconformance with this specification. Incase of conflict between the requirements of this specificationand Specification A781/A781M, this specification shall pre-vail.3.2 Steel investment castings furnished to this specificationshall conform to the requirements of Specificatio
12、n A957/A957M, including any supplementary requirements that areindicated in the purchase order. Failure to comply with thegeneral requirements of Specification A957/A957M consti-tutes nonconformance with this specification. In case of con-flict between the requirements of this specification and Spec
13、i-fication A957/A957M, A957/A957M shall prevail.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 Feb. 1, 2016. Published February 2016. Originall
14、yapproved in 1977. Last previous edition approved in 2012 as A747/A747M 12.DOI: 10.1520/A0747_A0747M-16.2For 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 standard
15、s Document Summary page onthe ASTM website.3Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100
16、Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14. Ordering Information4.1 Orders for material to this specification should includethe following:4.1.1 Quantity,4.1.2 Specification designation and date of issue,4.1.3 Grade designation Table 1, and4.1.4 Description of c
17、asting by part, pattern, or drawingnumber. (Dimensional tolerances and machined surfacesshould be indicated on the casting drawing).4.1.5 Heat treatment condition (SA, H900, and so forth), see5.2 and Table 1,4.1.6 Options in the specification, if any, in accordance with5.2 and Section 7, and4.1.7 Su
18、pplementary requirements, if any, including thestandards of acceptance.4.1.8 For ASME Boiler stainless steel;steel castingsTABLE 1 Precipitation Hardening Heat TreatmentA, BCondition PHCTemperature, FCTime in hoursminimumCooling TreatmentSA Not precipitation hardened (see 5.2.3)H900 900 480 1.5 air
19、coolH925 925 495 1.5 air coolH1025 1025 550 4.0 air coolH1075 1075 580 4.0 air coolH1100 1100 595 4.0 air coolH1150 1150 620 4.0 air coolH1150M 1400 7601150 6202.04.0air coolair coolH1150 DBL 1150 6201150 6204.04.0air coolair coolAThe furnace and controls used shall be calibrated and capable of unif
20、ormity ofheating in order to ensure consistent results.BSee Note 1.C25F 15C.TABLE 2 Chemical RequirementsAGradeUNSTypeCB7Cu-1J9218017-4CB7Cu-2J9211015-5Carbon 0.07 0.07Manganese 0.70 0.70Phosphorus 0.035 0.035Sulfur 0.03 0.03Silicon 1.00 1.00Chromium 15.5017.70 14.015.50Nickel 3.604.60 4.505.50Coppe
21、r 2.503.20 2.503.20Columbium 0.150.35B0.150.35BNitrogenC0.05 0.05ALimits are percent maximum unless shown as a range or stated otherwise.BSee 5.2.4 and 6.2. When the H900 condition is ordered, the minimum columbiumcontent shall not apply.CTo be determined and reported when specified by the order or
22、contract.A747/A747M 162SUPPLEMENTARY REQUIREMENTSAlist of standardized supplementary requirements for use at the option of the purchaser is describedin Specifications A781/A781M and A957/A957M. Those that are considered suitable for use with thisspecification are listed below by title only. Addition
23、al supplementary requirements suitable for usewith this specification at the option of the purchaser are described below. One or more of thesupplementary requirements indicated below may be included in the purchasers order or contract.When so included, a supplementary requirement shall have the same
24、 force as if it were in the bodyof the specification. Supplementary requirements details not fully described shall be agreed uponbetween the purchaser and the supplier, but shall not negate any of the requirements in the body ofthe specification.S1. Magnetic Particle ExaminationNOTE 2When CB7CU-1 al
25、loy is inspected by magnetic particlemethod, false indications may be caused by ferrite stringers or traces ofretained austenite in the microstructure. Liquid penetrant methods may beused to confirm the presence or absence of a discontinuity when suchindications are noted.S2. Radiographic Examinatio
26、nS3. Liquid Penetrant ExaminationS5. Examination of Weld PreparationS6. CertificationS10. Hardness Test (Rockwell)S10.1 Rockwell hardness test shall be made from each heattreatment load for each heat. The results shall conform to therequirements in Table Table S14.1 and shall be reported to thepurch
27、aser or his representative.S10.2 The test shall be conducted in accordance with TestMethods and Definitions A370.S13. Hardness Test (Brinell)S13.1 Brinell hardness test shall be made from each heat-treatment load for each heat. The results shall be in accordancewith the requirements in Table S14.1 a
28、nd shall be reported tothe purchaser or his representative.S13.2 The test may be made on the end of the tensionspecimen unless the order requires it to be made on a casting,in which case, where possible, the test shall be made on a bossor extension located on the casting suitable for testing in theB
29、rinell tester.S13.3 The test shall be conducted in accordance with TestMethods and Definitions A370.S14. Tension TestS14.1 Tensile properties shall be determined from materialrepresenting each heat. The bar from which the test specimenis taken shall be heat treated with production castings to thesam
30、e procedure as the castings it represents, unless the castingsare ordered in the solution-annealed condition (5.2.2). TheTABLE S14.1 Mechanical PropertiesAlloyTypePH HeatTreatmentHardness,HBYield Strength0.2 % Offset, min,ksi MPaTensile Strength,ksi MPaElongation in 2in. 51 mm,min, %ACB7Cu-1 H900 37
31、5 min 145 1000 170 1170 5H925 375 min 150 1035 175 1205 5H1025 311 min 140 965 150 1035 9H1075 277 min 115 795 145 1000 9H1100 269 min 110 760 135 930 9H1150 269 min 97 670 125 860 10H1150MH1150 DBL310 max310 max.CB7Cu-2 H900 375 min 145 1000 170 1170 5H925 375 min 150 1035 175 1205 5H1025 311 min 1
32、40 965 150 1035 9H1075 277 min 115 795 145 1000 9H1100 269 min 110 760 135 930 9H1150 269 min 97 670 125 860 10H1150MH1150 DBL310 max310 max.AIf sub-size tension test bars are used, the gauge length/gauge diameter ratio must be 4 to 1 to assure elongation values comparable with those of the standard
33、 testspecimen.A747/A747M 163results shall be in accordance with the requirements specifiedin Table S14.1 and shall be reported to the purchaser or hisrepresentative.S14.2 When the contract or order specifies that the castingsare to be furnished in the solution-annealed condition, themanufacturer sha
34、ll test specimens representing the castings thathave been given the precipitation heat treatment specified bythe purchaser in accordance with Table 1.S14.3 Test coupons and tests shall be made in accordancewith Test Methods and Definitions A370. Where possible, thestandard 2-in. 50-mm gauge length s
35、pecimens shall be used.When investment castings are ordered, specimens may be castto shape or machined from coupons to dimensions in accor-dance with Test Methods and Definitions A370 or the ICI bar.Standard subsize specimens may be used when a 2-in. gaugelength specimen is not feasible. When subsiz
36、e specimens areused, the gauge length shall be four times the gauge diameter.S14.4 If any test specimen shows defective machining ordevelops flaws, it may be discarded and another specimensubstituted from the same lot. A retest shall be allowed if thepercentage elongation of any tension test specime
37、n is less thanthat specified in Table S14.1, or if any part of the fracture ismore than34 in. 19 mm from the center of a standard 2-in.50-mm gauge length established by scribe scratches on theuntested specimen.S18. Hot Isostatic Pressing (HIPing)In accordance withPractice A1080.S26. Homogenization H
38、eat TreatmentS26.1 The homogenization heat treatment shall consist ofheating the castings and test material to a minimum of 1900F1040C, holding for a minimum of 112 h, and cooling tobelow 90F 30C.S27. Product MarkingS27.1 The manufacturers name or identification mark andthe pattern number shall be c
39、ast or stamped on all castingsexcept those of such small size as to make such markingimpractical. To minimize small defects caused by dislodgedparticles of molding sand, the number of cast identificationmarks should be minimized. When further specified, the heatnumbers shall be marked on individual
40、castings.S27.2 When the castings are too small to mark individually,a symbol traceable to the lot shall be placed on the castings andthe required identification then placed on a tag affixed to thecontainer in which these castings are shipped.S58. As-Cast WeldingS58.1 When agreed upon between purchas
41、ter and suppliercastings may be repaired in the as-cast condition.S58.2 When castings are welded in the as-cast conditionthey shall be homogenize heat treated using the Hot IsostaticPressing process (HIPing) (see 5.2.1.1).SUMMARY OF CHANGESCommittee A01 has identified the location of selected change
42、s to this standard since the last issue(A747/A747M 12) that may impact the use of this standard. (Approved Feb. 1, 2016.)(1) Added reference to A1080 in Section 2.(2) Revised wording in 4.1.8.(3) Added HIPin accordance with Practice A1080 in Section 5.(4) Added HIP in accordance with Practice A1080
43、in SectionS18.(5) Added new Section S58As-Cast Welding.(6) Corrected numbering errors throughout.A747/A747M 164ASTM 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 advise
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46、ou feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individua
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