1、Designation: A 128/A 128M 93 (Reapproved 2003)Standard Specification forSteel Castings, Austenitic Manganese1This standard is issued under the fixed designation A 128/A 128M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year
2、 of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the 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:A 781/A 781M Specification for Castings, Steel and Alloy,Common Requirements for General Industrial Use23. General Conditions for
5、 Delivery3.1 Material furnished to this specification shall conform tothe requirements of Specification A 781/A 781M, includingany supplementary requirements that are indicated in thepurchase order. Failure to comply with the general require-ments of Specification A 781/A 781M constitutes nonconfor-
6、mance with this specification. In case of conflict between therequirements of this specification and Specification A 781/A 781M, this specification shall prevail.4. Ordering Information4.1 Orders for material under this specification shouldinclude the following information in proper sequence.4.1.1 Q
7、uantity,4.1.2 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 achieve
8、toughness and ductility. This heat treatment shall consist ofuniformly heating the castings to a temperature applicable forgrade of steel produced, at least 1800F 1000C, and holdinguntil the temperature is uniform throughout and quenching inan applicable medium, normally water.5.2 By agreement betwe
9、en the purchaser and the manufac-turer, castings may be furnished in a condition other thandescribed 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 dr
10、ills of the best highspeed 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 to1100F 500 to 600C.7. Repair by Welding7.1 Defects shall be welded
11、 using a 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. Keywo
12、rds8.1 austenitic manganese steel; manganese steel; steelcastings1This 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 April 10, 2003. Published April
13、 2003. Originallyapproved in 1930. Last previous edition approved in 1998 as A 128/A 128M 93(1998).2Annual Book of ASTM Standards, Vol 01.02.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.SUPPLEMENTARY REQUIREMENTSAlist of standardi
14、zed supplementary requirements for use at the option of the purchaser is describedin SpecificationA 781/A 781M. 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 opti
15、on of the purchaser are described below. One or more of the supplementaryrequirements 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 descr
16、ibed shall be agreed upon between the purchaser and the supplier,but 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 withoutbreak
17、ing into two pieces. (Surface cracks after bending are notconsidered 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 The bend test has become e
18、ssentially obsolete as a result ofimproved technology. Furthermore, it is not recommended as a suitabletest for the special alloy grades.S50.2 The bend specimen shall be poured in separatemoldsfrom the same heat of steel as the castings. They shall be12 by34 in. 13 by 19 mm in cross section and 12 i
19、n. 300 mm inlength, and shall be heat treated and tested without 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
20、 discretion of the manufacturer and unlessotherwise specified by 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
21、 tests for any heat do not conform to therequirements specified, 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.ASTM International takes no posit
22、ion respecting 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 responsibilit
23、y.This standard 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
24、 International 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 s
25、hown below.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), 610-8
26、32-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE 1 Chemical RequirementsGradeAComposition, %Carbon Manganese Chromium Molybdenum Nickel Silicon 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.
27、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 11.514.0 . . 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
28、 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 obtainable for a particular design required. Final selectionshall be by mutual agreement between manufacturer and purchaser.BUnless otherwise specified, Grade A will be supplied.A 128/A 128M 93 (2003)2
