1、Designation: A747/A747M 16aStandard 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 las
2、t 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
3、by 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 mechani
4、cal properties specified in TableS24.1 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-vidual
6、ly 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 e
7、ither 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
8、the text, the SI units are shown in brackets.2. Referenced Documents2.1 ASTM Standards:2A781/A781M Specification for Castings, Steel and Alloy,Common Requirements, for General Industrial UseA957/A957M Specification for Investment Castings, Steeland Alloy, Common Requirements, for General IndustrialU
9、seA1067/A1067M Specification for Test Coupons for SteelCastingsA1080 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 Delivery3.1 Exce
10、pt 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 A781/A781M co
11、nstitutes 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 Specification A957/A957
12、M, 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 Speci-fication
13、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 May 15, 2016. Published May 2016. Originallyapproved in 197
14、7. Last previous edition approved in 2016 as A747/A747M 16.DOI: 10.1520/A0747_A0747M-16A.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 standards Document Summ
15、ary 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 Barr Harbor Dri
16、ve, 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 casting by part,
17、 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 Supplementary req
18、uirements, 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 coolH925 925 49
19、5 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 uniformity ofheatin
20、g 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 4.505.50Copper 2.503.20 2.50
21、3.20Columbium (niobium) 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 contr
22、act.A747/A747M 16a2SUPPLEMENTARY 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. Additional s
23、upplementary 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 for
24、ce 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 alloy
25、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 ExaminationS3.
26、 Liquid Penetrant ExaminationS5. Examination of Weld PreparationS6. CertificationS10. Hardness TestS10.1 Rockwell or Brinell hardness tests shall be made fromeach heat treatment load for each heat. The results shallconform to the requirements in Table S24.1 and shall bereported to the purchaser or h
27、is representative.S10.2 The test method depends on the size and configurationof the casting and must be agreed upon between purchaser andsupplier.S10.3 Brinell tests 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
28、test shall be made on a bossor extension located on the casting suitable for testing in theBrinell tester.S14. Tension Test Cut From CastingsS18. Hot Isostatic Pressing (HIPing)In accordance withPractice A1080.S24. Tension TestS24.1 Tensile properties shall be determined from materialrepresenting ea
29、ch heat. The bar from which the test specimenis taken shall be heat treated with production castings to thesame procedure as the castings it represents, unless the castingsare ordered in the solution-annealed condition (5.2.2). Theresults shall be in accordance with the requirements specifiedin Tabl
30、e S24.1 and shall be reported to the purchaser or hisrepresentative.S24.2 When the contract or order specifies that the castingsare to be furnished in the solution-annealed condition, themanufacturer shall test specimens representing the castings thatTABLE S24.1 Mechanical PropertiesAlloyTypePH Heat
31、Treatment Hardness,Yield Strength0.2 % Offset, min,ksi MPaTensile Strength,ksi MPaElongation in 2in. 51 mm,min, %AHBW HRCCB7Cu-1 H900 375 min 40 min 145 1000 170 1170 5H925 375 min 40 min 150 1035 175 1205 5H1025 311 min 33 min 140 965 150 1035 9H1075 277 min 29 min 115 795 145 1000 9H1100 269 min 2
32、8 min 110 760 135 930 9H1150 269 min 28 min 97 670 125 860 10H1150MH1150 DBL310 max310 max33 max33 max.CB7Cu-2 H900 375 min 40 min 145 1000 170 1170 5H925 375 min 40 min 150 1035 175 1205 5H1025 311 min 33 min 140 965 150 1035 9H1075 277 min 29 min 115 795 145 1000 9H1100 269 min 28 min 110 760 135
33、930 9H1150 269 min 28 min 97 670 125 860 10H1150MH1150 DBL310 max310 max33 max33 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 testspecimen.A747/A747M 16a3have been given the precipi
34、tation heat treatment specified bythe purchaser in accordance with Table 1.S24.3 Where possible, the standard 2-in. 50-mm gaugelength specimens shall be used. When investment castings areordered, specimens may be cast to shape or machined fromcoupons to dimensions. Standard subsize specimens may beu
35、sed when a 2-in. gauge length specimen is not feasible. Whensubsize specimens are used, the gauge length shall be fourtimes the gauge diameter. The recommended coupons arefound in Specification A1067/A1067M. The specific coupon tobe tested shall be agreed upon between purchaser and supplier.S24.4 If
36、 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 specimen is less thanthat specified in Table S24.1, or if any part of the fracture ismore th
37、an 34 in. 19 mm from the center of a standard 2-in.50-mm gauge length established by scribe scratches on theuntested specimen.S27. Product MarkingS27.1 The manufacturers name or identification mark andthe pattern number shall be cast or stamped on all castingsexcept those of such small size as to ma
38、ke 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 castings.S27.2 When the castings are too small to mark individually,a
39、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.S56. Homogenization Heat TreatmentS56.1 The homogenization heat treatment shall consist ofheating the castings and test material
40、 to a minimum of 1900F1040C, holding for a minimum of 112 h, and cooling tobelow 90F 30C.S58. As-Cast WeldingS58.1 When agreed upon between purchaster 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 tr
41、eated using the Hot IsostaticPressing process (HIPing) (see 5.2.1.1).SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A747/A747M 16) that may impact the use of this standard. (Approved XXXX)(1) Added Specification A1067/A1067M to S
42、ection 2: Refer-ence Documents; Removed Test Methods A0370.(2) Revised S10. Hardness Test: Combined Brinell and Rock-well into one supplementary requirement. Eliminated S13 andreference to Test Methods A370.(3) Renumbered S14 to S24. Tension Test and eliminatedreferences to Test Methods A370; added
43、reference to Specifi-cation A1067/A1067M.(4) Renumbered S26 to S56. Homogenization Heat Treatment.(5) Revised S14. Tension Test to S14. Tension Test Cut FromCastings.(6) Renumbered Table S14.1 to S24.1 Mechanical Properties.(7) In Section 4.1.8, eliminated S8, S15, and S24 and renum-bered S14 to S24
44、.(8) Added Rockwell C Hardness to Table 24.1.(9) Corrected numbering errors throughout.Committee A01 has identified the location of selected changes 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
45、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 in SectionS18.(5) Added new Section S58As-Cast Welding.(6) Corrected numbering errors throughout.A747/A747M 16a4ASTM International takes no position resp
46、ecting 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 s
47、tandard 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 addressed to ASTM Interna
48、tional Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you 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 bel
49、ow.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the
