1、Designation: A 837/A 837M 06Standard Specification forSteel Forgings, Alloy, for Carburizing Applications1This standard is issued under the fixed designation A 837/A 837M; 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 (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers alloy steel forgings for carbur-izing applications.1.2 Forgings are considered weldable u
3、nder proper condi-tions. Welding technique is of fundamental importance and it ispresupposed that welding procedure and inspection shall be inaccordance with approved methods for the class of materialused.1.3 This specification is expressed in both inch-pound unitsand in SI units. However, unless th
4、e order specifies theapplicable M specification designation (SI units), the materialshall be furnished to inch-pound units.1.4 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, e
5、achsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.2. Referenced Documents2.1 ASTM Standards:2A 275/A 275M Test Method for Magnetic Particle Exami-nation of Steel ForgingsA 388/A 388M Practice for Ultrasonic Examina
6、tion ofHeavy Steel ForgingsA 788/A 788M Specification for Steel Forgings, GeneralRequirementsE 527 Practice for Numbering Metals and Alloys (UNS)3. Ordering Information3.1 Instructions for purchasing forgings to this specificationare to be in accordance with Specification A 788/A 788M.3.2 In additio
7、n to the basic requirements of this specifica-tion, certain supplementary requirements are listed at the endof this specification. These supplementary requirements maybe applicable when additional control, testing, or examinationis required to meet end use requirements.4. Heat Treatment4.1 The forgi
8、ngs shall be given a normalize or normalizeand temper heat treatment.5. Machining5.1 Rough machining before heat treatment may be per-formed at the option of the manufacturer.6. Chemical Composition6.1 The steel shall conform to the requirements for chemicalcomposition prescribed in Table 1 unless o
9、therwise modified inaccordance with Supplementary Requirement S4.7. Mechanical Properties7.1 Hardness:7.1.1 Maximum hardness of the forgings shall be 229 BHN.7.1.2 Hardness tests shall be taken on prepared surfaces ofthe forging after machining to the purchasers ordering require-ments.7.1.3 Number a
10、nd Location of Tests:7.1.3.1 For forgings not intended for gear applications, thenumber and location of hardness tests shall be by agreementbetween the purchaser and forger.7.1.3.2 For gear applications on each forging 8 in. 200 mmand over in diameter, four Brinell hardness tests shall be madeon the
11、 outside surface of that portion of the forging on whichteeth will be cut two tests being made on each helix 180 apart,and the tests on the two helices shall be 90 apart. On eachforging under 8 in. 200 mm in diameter two Brinell hardnesstests shall be made, one on each helix 180 apart. On hollow,cyl
12、indrical forgings, one hardness test on each end shall betaken 180 apart. Hardness tests shall be performed at thequarter-face width of the tooth-portion diameter.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct respons
13、ibility of SubcommitteeA01.06 on Steel Forgings and Billets.Current edition approved May 1, 2006. Published May 2006. Originallyapproved in 1985. Last previous edition approved in 2003 as A 837/A 837M 03.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Se
14、rvice 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 19
15、428-2959, United States.8. Other Requirements8.1 Forgings supplied to this material specification shallconform to the latest issue of Specification A 788/A 788M.8.2 Specification A 788/A 788M covers forging terminol-ogy, melting processes, chemical analysis test methods, prod-uct analysis tolerances
16、, mechanical testing methods, repairwelding restrictions, marking, and certification requirements.9. Keywords9.1 alloy steel forgings; carburizingSUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall apply only when specified by the purchaser on theorder and agreed to by the manuf
17、acturer.S1. Rough Turning and BoringS1.1 The position of rough turning and boring in thesequence of manufacturing operations is specified.S2. Magnetic Particle ExaminationS2.1 Magnetic particle examination shall be specified inaccordance with Test Method A 275/A 275M. Reporting andacceptance standar
18、ds shall be a matter of agreement.S3. Ultrasonic ExaminationS3.1 Ultrasonic examination shall be specified in accor-dance with Practice A 388/A 388M. Reporting and acceptancestandards shall be a matter of agreement.S4. Phosphorous and Sulfur RestrictionS4.1 Phosphorus shall not exceed 0.015 %, and t
19、he sulfurshall not exceed 0.018 % for all classes when determined inaccordance with the heat analysis requirements of SpecificationA 788/A 788M.S5. Vacuum DegassingS5.1 Vacuum treatment of the molten steel prior to or duringthe pouring of the ingot is required.SUMMARY OF CHANGESCommittee A01 has ide
20、ntified the location of selected changes to this standard since the last issue,A 837/A 837M 03, that may impact the use of this standard. (Approved May 1, 2006.)(1)InTable 1, corrected UNS number for Grade 9310.TABLE 1 Grade Designations and Chemical CompositionsUNSDesignationAGradeDesignationBChemi
21、cal Composition, Ranges and Limits, %CarbonMan-ganesePhos-phorus,maxSulfur,max SiliconCNickelChro-miumMolyb-denumCopper,maxG33106 E3310 0.080.13 0.450.60 0.025 0.025 0.150.35 3.253.75 1.401.75 0.10 max 0.35G43200 4320 0.170.22 0.450.65 0.035 0.040 0.150.35 1.652.00 0.400.60 0.200.30 0.35G46200 4620
22、0.170.22 0.450.65 0.035 0.040 0.150.35 1.652.00 0.25 max 0.200.30 0.35G48150 4815 0.130.18 0.400.60 0.035 0.040 0.150.35 3.253.75 0.25 max 0.200.30 0.35G86200 8620 0.180.23 0.700.90 0.035 0.040 0.150.35 0.400.70 0.400.60 0.150.25 0.35G93106 9310 0.070.13 0.400.70 0.035 0.040 0.150.35 2.953.55 1.001.
23、45 0.080.15 0.35S41000 410 0.15 max 1.00 max 0.040 0.030 1.00 max 0.50 max 11.5013.50 0.10 max 0.35ANew designation established in accordance with Practice E 527.BGrade designations correspond to the respective Practice E 527.CWhen vacuum carbon deoxidation is used, silicon maximum shall be 0.10 %.A
24、 837/A 837M 062ASTM 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 advised that determination of the validity of any such patent rights, and the riskof infringement of s
25、uch 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 andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for add
26、itional standardsand should be addressed to ASTM 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 t
27、he 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. 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).A 837/A 837M 063
