1、Designation: A297/A297M 10Standard Specification forSteel Castings, Iron-Chromium and Iron-Chromium-Nickel,Heat Resistant, for General Application1This standard is issued under the fixed designation A297/A297M; the number immediately following the designation indicates the yearof original adoption o
2、r, 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 iron-chromium and iron-chromium-nickel alloy castin
3、gs for heat-resistant service. Thegrades covered by this specification are general purpose alloysand no attempt has been made to include heat-resisting alloysused for special production application.NOTE 1For heat-resisting alloys used for special product application,reference should be made to Speci
4、fication A351/A351M, A217/A217M,and A447/A447M.1.2 The values stated in either 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
5、 two systems may result in non-conformancewith the standard.2. Referenced Documents2.1 ASTM Standards:2A217/A217M Specification for Steel Castings, MartensiticStainless and Alloy, for Pressure-Containing Parts, Suit-able for High-Temperature ServiceA351/A351M Specification for Castings, Austenitic,
6、forPressure-Containing PartsA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA447/A447M Specification for Steel Castings, Chromium-Nickel-Iron Alloy (25-12 Class), for High-TemperatureServiceA781/A781M Specification for Castings, Steel and Alloy,Common Requirements, for Gener
7、al Industrial UseA957 Specification for Investment Castings, Steel and Al-loy, Common Requirements, for General Industrial Use3. General Conditions for Delivery3.1 Except for investment castings, material furnished tothis specification shall conform to the requirements of Speci-fication A781/A781M,
8、including any supplementary require-ments that are indicated in the purchase order. Failure tocomply with the general requirements of Specification A781/A781M constitutes nonconformance with this specification. Incase of conflict between the requirements of this specificationand Specification A781/A
9、781M, this specification shall pre-vail.3.2 Investment castings furnished to this specification shallconform to the requirements of Specification A957, includingany supplementary requirements that are indicated in thepurchase order. Failure to comply with the general require-ments of Specification A
10、957 constitutes nonconformance withthis specification. In case of conflict between the requirementsof this specification and Specification A957, SpecificationA957 shall prevail.4. Ordering Information4.1 The inquiry and order should include or indicate thefollowing:4.1.1 A description of the casting
11、 by pattern number ordrawing (dimensional tolerances shall be included on thecasting drawing),4.1.2 Grade of steel,4.1.3 Options in the specification, and1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility o
12、f SubcommitteeA01.18 on Castings.Current edition approved May 1, 2010. Published June 2010. Originallyapproved in 1946. Last previous edition approved in 2008 as A297/A297M 08a.DOI: 10.1520/A0297_A0297M-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer
13、Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA
14、19428-2959, United States.4.1.4 The supplementary requirements desired including thestandards of acceptance.5. Process5.1 Alloys shall be made by the following processes:electric-arc, electric-induction, or other approved processes.6. Heat Treatment6.1 Castings for heat-resistant service may be ship
15、ped in theas-cast condition without heat treatment. If heat treatment isrequired, the treatment shall be established by mutual agree-ment between the manufacturer and the purchaser and shall beso specified in the inquiry, contract, or order.7. Chemical Composition7.1 Alloys shall conform to the requ
16、irements as to chemicalcomposition prescribed in Table 1.8. Repair by Welding8.1 Except for Grade HG10MNN, the composition of thedeposited weld metal shall be similar to the composition of thecasting. For Grade HG10MNN, the filler metal to be used shallbe established by mutual agreement between the
17、manufacturerand the purchaser. All weld repairs shall be subjected to thesame inspection standards as the casting.8.2 Castings with major weld repairs shall be heat treated inaccordance with Section 6.8.3 Weld repairs shall be considered major when the depthof the cavity after preparation for repair
18、 exceeds 20 % of theactual wall thickness, or 1 in. 25 mm, whichever is smaller,or when the extent of the cavity exceeds approximately 10in.265 cm2.8.3.1 When Supplementary Requirement S7 is specified onthe purchase order, or inquiry, major weld repairs shall besubject to the prior approval of the p
19、urchaser.8.4 All other weld repairs shall be considered minor andmay be made at the discretion of the manufacturer withoutprior approval of the purchaser.A297/A297M 102SUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall not apply unless specified in the purchase order. Alist of
20、standardized supplementary requirements for use at the option of the purchaser is included inSpecification A781/A781M. Those which are ordinarily considered suitable for use with thisspecification are given below. Others enumerated in A781/A781M may be used with this specificationupon agreement betw
21、een the manufacturer and purchaser.S1. Magnetic Particle ExaminationS2. Radiographic ExaminationS3. Liquid Penetrant ExaminationS4. Ultrasonic ExaminationS5. Examination of Weld PreparationS6. CertificationS7. Prior Approval of Major Weld RepairsS8. MarkingS9. Tension TestS9.1 One tension test shall
22、 be made from material repre-senting each heat. The bar from which the test specimen istaken shall be heat treated in production furnaces to the sameprocedure as the castings it represents. The results shallconform to the requirements specified in Table S9.1.S9.2 Test bars shall be poured in separat
23、ely cast keel blocksshown in Specification A781/A781M, unless the purchaseorder is for investment castings, in which case, test materialshall be poured in accordance with the requirements ofSpecification A957.S9.3 Tension test specimens may be cut from heat-treatedcastings; or from as-cast castings
24、if no heat treatment isspecified for the castings, instead of from test bars when agreedupon between the manufacturer and the purchaser or at theoption of the producer if suitable separately cast test material isnot available.S9.4 Test specimens shall be the standard round 2-in.50-mm gage length spe
25、cimen shown in Specification A370,unless the purchase order is for investment castings, in whichcase, the specimen shall be in accordance with SpecificationA957.S9.5 If the results of the mechanical tests for any heat do notconform to the requirements specified, the castings may beTABLE 1 Chemical R
26、equirementsGrade TypeComposition, % (max, except where range is given)Carbon Manganese Silicon Phosphorus Sulfur Chromium Nickel MolybdenumAOtherBHF 19 Chromium,9 Nickel0.200.40 2.00 2.00 0.04 0.04 18.023.0 8.012.0 0.50HH 25 Chromium,12 Nickel0.200.50 2.00 2.00 0.04 0.04 24.028.0 11.014.0 0.50HI 28
27、Chromium,15 Nickel0.200.50 2.00 2.00 0.04 0.04 26.030.0 14.018.0 0.50HK 25 Chromium,20 Nickel0.200.60 2.00 2.00 0.04 0.04 24.028.0 18.022.0 0.50HE 29 Chromium,9 Nickel0.200.50 2.00 2.00 0.04 0.04 26.030.0 8.011.0 0.50HT 15 Chromium,35 Nickel0.350.75 2.00 2.50 0.04 0.04 15.019.0 33.037.0 0.50HU 19 Ch
28、romium,39 Nickel0.350.75 2.00 2.50 0.04 0.04 17.021.0 37.041.0 0.50HW 12 Chromium,60 Nickel0.350.75 2.00 2.50 0.04 0.04 10.014.0 58.062.0 0.50HX 17 Chromium,66 Nickel0.350.75 2.00 2.50 0.04 0.04 15.019.0 64.068.0 0.50HC 28 Chromium 0.50 max 1.00 2.00 0.04 0.04 26.030.0 4.00 0.50HD 28 Chromium,5 Nick
29、el0.50 max 1.50 2.00 0.04 0.04 26.030.0 4.07.0 0.50HL 29 Chromium,20 Nickel0.200.60 2.00 2.00 0.04 0.04 28.032.0 18.022.0 0.50HN 20 Chromium,25 Nickel0.200.50 2.00 2.00 0.04 0.04 19.023.0 23.027.0 0.50HP 26 Chromium,35 Nickel0.350.75 2.00 2.50 0.04 0.04 2428 3337 0.50HG10MNNJ9260419 Chromium,12 Nick
30、el,4 Manganese0.070.11 3.05.0 0.70 0.040 0.03 18.520.5 11.513.5 0.250.45 Cu 0.50Nb(Cb)CN0.200.30CT15C 20 Chromium,33 Nickel,1 Niobium0.05 0.15 0.15 1.50 0.15 1.50 0.03 0.03 19.021.0 31.034.0 Nb 0.501.50ACastings having a specified molybdenum range agreed upon by the manufacturer and the purchaser ma
31、y also be furnished under these specifications.BNiobium (Nb) and Columbium (Cb) both designate element 41.CGrade HG10MNN shall have a niobium content of not less than 8 times the carbon, but not over 1.00 %.A297/A297M 103re-heat treated and re-tested, but may not be solution treated orre-austenitize
32、d more than twice.S9.6 If any test specimen shows defective machining ordevelops flaws, it may be discarded and another specimensubstituted from the same heat.SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A297/A297M 08a) that ma
33、y impact the use of this standard. (Approved May 1, 2010.)(1) Table 1, CT15C added. (2) Table S9.1, CT15C added.Committee A01 has identified the location of selected changes to this standard since the last issue(A297/A297M 08) that may impact the use of this standard. (Approved Nov. 1, 2008.)(1) Rev
34、ised paragraph 8.1, Table 1, and Table S9.1 to addGrade HG10MNN.TABLE S9.1 Tensile RequirementsGrade TypeTensileStrength, minYield Point,minElongationin 2in.50mm,min,%Aksi (MPa) ksi (MPa)HF 19 Chromium, 9Nickel70 (485) 35 (240) 25HH 25 Chromium, 12Nickel75 (515) 35 (240) 10HI 28 Chromium, 15Nickel70
35、 (485) 35 (240) 10HK 25 Chromium, 20Nickel65 (450) 35 (240) 10HE 29 Chromium, 9Nickel85 (585) 40 (275) 9HT 15 Chromium, 35Nickel65 (450) . . 4HU 19 Chromium, 39Nickel65 (450) . . 4HW 12 Chromium, 60Nickel60 (415) . . .HX 17 Chromium, 66Nickel60 (415) . . .HC 28 Chromium 55 (380) . . .HD 28 Chromium,
36、 5Nickel75 (515) 35 (240) 8HL 29 Chromium, 20Nickel65 (450) 35 (240) 10HN 20 Chromium, 25Nickel63 (435) . . 8HP 26 Chromium, 35Nickel62.5 (430) 34 (235) 4.5HG10MNN19 Chromium, 12Nickel,4 Manganese76 (525) 33 (225) 20CT15C 20 Chromium, 33Nickel,1 Niobium63 435 25 170 20.0AWhen ICI test bars are used
37、in tensile testing as provided for in thisspecification, the gage length to reduced section diameter ratio shall be 4 to 1.A297/A297M 104ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this sta
38、ndard 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 an
39、dif 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 International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee,
40、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 below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-295
41、9,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 ASTM website (www.astm.org/COPYRIGHT/).A297/A297M 105
