1、Designation: A837/A837M 06 (Reapproved 2016)A837/A837M 17Standard Specification forSteel Forgings, Alloy, for Carburizing Applications1This standard is issued under the fixed designation A837/A837M; the number immediately following the designation indicates the yearof original adoption or, in the ca
2、se 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 alloy steel forgings for carburizing applications.1.2 Forgings
3、are considered weldable under proper conditions. Welding technique is of fundamental importance and it ispresupposed that welding procedure and inspection shall be in accordance with approved methods for the class of material used.1.3 This specification is expressed in both inch-pound units and in S
4、I units. However, unless the order specifies the applicableM specification designation (SI units), the material shall be furnished to inch-pound units.1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in eachsystem may not be ex
5、act equivalents; therefore, each system shall be used independently of the other. Combining values from thetwo systems may result in non-conformance with the standard.1.5 This international standard was developed in accordance with internationally recognized principles on standardizationestablished
6、in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A275/A275M Practice for Magnetic Particle Examination of Steel Forging
7、sA388/A388M Practice for Ultrasonic Examination of Steel ForgingsA788/A788M Specification for Steel Forgings, General RequirementsE527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)3. Ordering Information3.1 Instructions for purchasing forgings to this specification a
8、re to be in accordance with Specification A788/A788M.3.2 In addition to the basic requirements of this specification, certain supplementary requirements are listed at the end of thisspecification. These supplementary requirements may be applicable when additional control, testing, or examination is
9、required tomeet end use requirements.4. Heat Treatment4.1 The forgings shall be given a normalize or normalize and temper heat treatment.5. Machining5.1 Rough machining before heat treatment may be performed at the option of the manufacturer.6. Chemical Composition6.1 The steel shall conform to the
10、requirements for chemical composition prescribed in Table 1 unless otherwise modified inaccordance with Supplementary Requirement S4.1 This specification is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.06
11、on Steel Forgings and Billets.Current edition approved March 1, 2016Sept. 1, 2017. Published April 2016September 2017. Originally approved in 1985. Last previous edition approved in 20112016as A837/A837M 06 (2011).(2016). DOI: 10.1520/A0837_A0837M-06R16.10.1520/A0837_A0837M-17.2 For referencedASTM s
12、tandards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standardsstandards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the
13、user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard
14、 as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States17. Mechanical Properties7.1 Hardness:7.1.1 Maximum hardne
15、ss of the forgings shall be 229 BHN.Brinell hardness.7.1.2 Hardness tests shall be taken on prepared surfaces of the forging after machining to the purchasers ordering requirements.7.1.3 Number and Location of Tests:7.1.3.1 For forgings not intended for gear applications, the number and location of
16、hardness tests shall be by agreement betweenthe purchaser and forger.7.1.3.2 For gear applications on each forging 8 in. 200 mm and over in diameter, four Brinell hardness tests shall be madeon the outside surface of that portion of the forging on which teeth will be cut two tests being made on each
17、 helixend 180 apart,and the tests on the two helicesends shall be 90 apart. On each forging under 8 in. 200 mm in diameter two Brinell hardnesstests shall be made, one on each helixend 180 apart. On hollow, cylindrical forgings, one hardness test on each end shall be taken180 apart. Hardness tests s
18、hall be performed at the quarter-face width of the tooth-portion diameter.8. Other Requirements8.1 Forgings supplied to this material specification shall conform to the latest issue of Specification A788/A788M.8.2 Specification A788/A788M covers forging terminology, melting processes, chemical analy
19、sis test methods, product analysistolerances, mechanical testing methods, repair welding restrictions, marking, and certification requirements.9. Keywords9.1 alloy steel forgings; carburizingSUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall apply only when specified by the pur
20、chaser on theorder and agreed to by the manufacturer.S1. Rough Turning and BoringS1.1 The position of rough turning and boring in the sequence of manufacturing operations is specified.S2. Magnetic Particle ExaminationS2.1 Magnetic particle examination shall be specified in accordance with Test Metho
21、d A275/A275M. Reporting and acceptancestandards shall be a matter of agreement.S3. Ultrasonic ExaminationS3.1 Ultrasonic examination shall be specified in accordance with Practice A388/A388M. Reporting and acceptance standardsshall be a matter of agreement.TABLE 1 Grade Designations and Chemical Com
22、positionsUNSDesignationAGradeDesignationBChemical Composition, Ranges and Limits, %CarbonMan-ganesePhos-phorus,maxSulfur,max SiliconC NickelChro-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
23、.35 1.652.00 0.400.60 0.200.30 0.35G46200 4620 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 0.070.1
24、3 0.400.70 0.035 0.040 0.150.35 2.953.55 1.001.45 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 0.35A New designation established in accordance with Practice E527.B Grade designations correspond to the respective Practice E527.C When vacuum carbon deoxid
25、ation is used, silicon maximum shall be 0.10 %.A837/A837M 172S4. Phosphorous and Sulfur RestrictionS4.1 Phosphorus shall not exceed 0.015 %, and the sulfur shall not exceed 0.018 % for all classes when determined inaccordance with the heat analysis requirements of Specification A788/A788M.S5. Vacuum
26、 DegassingS5.1 Vacuum treatment of the molten steel prior to or during the pouring of the ingot is required.S6. Hardness TestingS6.1 Number and Location of TestsFor gear applications on each forging 8 in. 200 mm and over in diameter, four Brinellhardness tests shall be made on the outside surface of
27、 that portion of the forging on which teeth will be cut two tests beings madeon each helix 180 apart, and the tests on the two helices shall be 90 apart. On each forging under 8 in. 200 mm in diametertwo Brinell hardness tests shall be made, one on each helix 180 apart. On hollow, cylindrical forgin
28、gs, one hardness test on eachend shall be taken 180 apart. Hardness tests shall be performed at the quarter-face width of the tooth-portion diameter. When thissupplement is required, the purchaser shall supply detailed drawings indicating the location of the gear teeth, the helix angle, andthe locat
29、ion of the required hardness tests.SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue,A837/A837M 03A837/A837M 06,(2016), that may impact the use of this standard. (Approved May 1,2006.)Sept. 1, 2017.)(1) InRevised Table 17.1.3.2, cor
30、rected UNS number for Grade 9310. to apply to all forgings when tooth location is not known.(2) Moved requirements for hardness testing of helical gears to S6 and added the requirements that when S6 is invoked detaileddrawings be provided to the manufacturer so that hardness tests can be correctly p
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