1、Designation: A128/A128M 93 (Reapproved 2017)Standard Specification forSteel Castings, Austenitic Manganese1This standard is issued under the fixed designation A128/A128M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of
2、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.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 This specification covers Hadfie
3、ld austenitic manganesesteel castings and alloy modifications.1.2 The values stated in either inch-pound units or SI unitsare to be regarded separately as standard. Within the text, theSI units are shown in brackets. The values stated in eachsystem are not exact equivalents; therefore, each system m
4、ustbe used independently of the other. Combining values from thetwo systems may result in nonconformance with the specifi-cation.2. Referenced Documents2.1 ASTM Standards:2A781/A781M Specification for Castings, Steel and Alloy,Common Requirements, for General Industrial Use3. General Conditions for
5、Delivery3.1 Material furnished to this specification shall conform tothe requirements of Specification A781/A781M, including anysupplementary requirements that are indicated in the purchaseorder. Failure to comply with the general requirements ofSpecification A781/A781M constitutes nonconformance wi
6、ththis specification. In case of conflict between the requirementsof this specification and Specification A781/A781M, thisspecification shall prevail.4. Ordering Information4.1 Orders for material under this specification shouldinclude the following information in proper sequence.4.1.1 Quantity,4.1.
7、2 Specification, grade,4.1.3 Whether any portion of the casting is to be chilled, andwhether this is to be spot or full-face chilling,4.1.4 Special heat-treatment requirements, and4.1.5 Supplementary requirements.5. Heat Treatment5.1 The castings shall be suitably heat treated to achievetoughness an
8、d ductility. This heat treatment shall consist ofuniformly heating the castings to a temperature applicable forgrade of steel produced, at least 1800 F 1000 C, andholding until the temperature is uniform throughout andquenching in an applicable medium, normally water.5.2 By agreement between the pur
9、chaser and themanufacturer, castings may be furnished in a condition otherthan described in 5.1.6. Chemical Composition6.1 The steel shall conform to the requirements as tochemical composition prescribed in Table 1.6.2 Contamination of the drillings by drill chips must beavoided. Flat drills of the
10、best high speed steels, or drills ofsome of the newer tool materials, will generally be satisfactoryfor drilling manganese steel. Manganese steel may be drilledbest after it has been annealed for several hours at from 900 to1100 F 500 to 600 C.7. Repair by Welding7.1 Defects shall be welded using a
11、procedure and welderscapable of producing sound welds. The weld deposit shall beaustenitic steel in general, but welds on wearing surfaces shallconsist of austenitic manganese steel.7.2 Weld repairs shall be inspected to the same qualitystandards as are used to inspect the castings.8. Keywords8.1 au
12、stenitic manganese steel; manganese steel; steelcastings1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloysand is the direct responsibility of SubcommitteeA01.18 on Castings.Current edition approved March 15, 2017. Published March 2017. Ori
13、ginallyapproved in 1930. Last previous edition approved in 2012 as A128/A128M 93(2012). DOI: 10.1520/A0128_A0128M-93R17.2For 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
14、 to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization establishe
15、d in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1SUPPLEMENTARY REQUIREMENTSAlist of standardized supplementary requirements for use at the option of the purcha
16、ser is describedin Specification A781/A781M. Those which are considered suitable for use with this specification arelisted below by title only. Additional supplementary requirements suitable for use with thisspecification at the option of the purchaser are described below. One or more of the supplem
17、entaryrequirements indicated below may be included in the purchasers order or contract. When so included,a supplementary the same force as if it were in the body of the specification. Supplementaryrequirements details not fully described shall be agreed upon between the purchaser and the supplier,bu
18、t shall not negate any of the requirements in the body of the specification.S6. CertificationS8. MarkingS50. Bend TestS50.1 The test specimen shall withstand cold bendingthrough 150 around a pin 1 in. 25.4 mm in diameter withoutbreaking into two pieces. (Surface cracks after bending are notconsidere
19、d as failure if the sample remains in one piece.) Thespecimen may be bent by any method preferred by themanufacturer. When the bend test is specified, one such testshall be made from each heat of steel.NOTE 1The bend test has become essentially obsolete as a result ofimproved technology. Furthermore
20、, it is not recommended as a suitabletest for the special alloy grades.S50.2 The bend specimen shall be poured in separate moldsfrom the same heat of steel as the castings. They shall be12 by34 in. 13 by 19 mm in cross section and 12 in. 300 mm inlength, and shall be heat treated and tested without
21、beingmachined or ground, except when necessary to remove surfaceirregularities or decarburization.S50.3 Bend specimens shall be heat treated in the samemanner as the castings they represent, with due regard for themetal section. At the discretion of the manufacturer and unlessotherwise specified by
22、the purchaser, specimens may be heattreated separately or with the castings they represent.S50.4 If any specimen fails as the result of flaws, it may bediscarded and another specimen tested from the same heat. Ifthe results of the bend tests for any heat do not conform to therequirements specified,
23、the manufacturer may reheat treat andretest additional specimens from the same heat, but not morethan twice. In the case of reheat treating and retesting, twobend tests from each heat shall be required.TABLE 1 Chemical RequirementsGradeAComposition, %Carbon Manganese Chromium Molybdenum Nickel Silic
24、on PhosphorusAB1.051.35 11.0 min . . . 1.00 max 0.07 maxB-1 0.9 1.05 11.514.0 . . . 1.00 max 0.07 maxB-2 1.051.2 11.514.0 . . . 1.00 max 0.07 maxB-3 1.121.28 11.514.0 . . . 1.00 max 0.07 maxB-4 1.2 1.35 11.514.0 . . . 1.00 max 0.07 maxC 1.051.35 11.514.0 1.52.5 . . 1.00 max 0.07 maxD 0.7 1.3 11.514.
25、0 . . 3.04.0 1.00 max 0.07 maxE-1 0.7 1.3 11.514.0 . 0.91.2 . 1.00 max 0.07 maxE-2 1.051.45 11.514.0 . 1.82.1 . 1.00 max 0.07 maxF (J91340) 1.051.35 6.08.0 . 0.91.2 . 1.00 max 0.07 maxASection size precludes the use of all grades and the producer should be consulted as to grades practically obtainab
26、le for a particular design required. Final selectionshall be by mutual agreement between manufacturer and purchaser.BUnless otherwise specified, Grade A will be supplied.A128/A128M 93 (2017)2ASTM International takes no position respecting the validity of any patent rights asserted in connection with
27、 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 standard is subject to revision at any time by the responsible techni
28、cal 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 International Headquarters. Your comments will receive careful consideratio
29、n 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 below.This standard is copyrighted by ASTM International, 100 Barr Harb
30、or 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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 93 (2017)3
