ASTM A878 A878M-2017 Standard Specification for Steel Wire Modified Chromium Vanadium Valve Spring Quality《钢丝 改性铬钒阀门弹簧质量的标准规格》.pdf
《ASTM A878 A878M-2017 Standard Specification for Steel Wire Modified Chromium Vanadium Valve Spring Quality《钢丝 改性铬钒阀门弹簧质量的标准规格》.pdf》由会员分享,可在线阅读,更多相关《ASTM A878 A878M-2017 Standard Specification for Steel Wire Modified Chromium Vanadium Valve Spring Quality《钢丝 改性铬钒阀门弹簧质量的标准规格》.pdf(6页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: A878/A878M 05 (Reapproved 2011)A878/A878M 17Standard Specification forSteel Wire, Modified Chromium Vanadium Valve SpringQuality1This standard is issued under the fixed designation A878/A878M; the number immediately following the designation indicates the yearof original adoption or, in
2、 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 the highest quality of round and shaped modified chromiu
3、m vanadium alloy steel valve springwire, uniform in quality and temper, intended for the manufacture of valve springs and other springs requiring high-fatigueproperties when used at moderately elevated temperatures. It is similar to the grade VD (referenced in EN 10270-2) intended forhigh fatigue le
4、vels. This wire shall be either in the annealed and cold-drawn or oil-tempered condition as specified by purchaser.1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, theinch-pound units are shown in brackets. The values stated in
5、each system are not exact equivalents; therefore, each systemmustshall be used independent of the other. Combining values from the two systems may result in non-conformance with thestandard.1.3 This international standard was developed in accordance with internationally recognized principles on stan
6、dardizationestablished 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:2A370 Test Methods and Definitions for Mechanica
7、l Testing of Steel ProductsA700 Guide for Packaging, Marking, and Loading Methods for Steel Products for ShipmentA941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and FerroalloysA751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel ProductsE8/E8M Test Method
8、s for Tension Testing of Metallic MaterialsE29 Practice for Using Significant Digits in Test Data to Determine Conformance with SpecificationsE45 Test Methods for Determining the Inclusion Content of Steel2.2 Federal Standard:3Fed. Std. No. 123 Marking for Shipment (Civil Agencies)2.3 Military Stand
9、ard:3MIL-STD-163 Steel Mill Products, Preparation for Shipment and Storage2.4 AIAGEuropean Standard:4AIAG B-5EN10270-2 02.00 Primary Metals Identification Tag Application StandardSteel Wire for Mechanical Springs Part 2:Oil-Hardened and Tempered Spring Steel Wire of Unalloyed and Alloyed Steels3. Te
10、rminology3.1 Definitions:3.1.1 For definition of terms used in this specification, refer to Terminology A941.3.2 Definitions of Terms Specific to This Standard:1 This specification is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloysand is the direct responsibil
11、ity of Subcommittee A01.03on Steel Rod and Wire.Current edition approved Nov. 1, 2011Sept. 1, 2017. Published November 2011September 2017. Originally approved in 1987. Last previous edition approved in 20052011as A878/A878M 05.A878/A878M 05 (2011). DOI: 10.1520/A0878_A0878M-05R11.10.1520/A0878_A0878
12、M-17.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 Available from Standardization Documents Order Desk, D
13、ODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-50984 Available from Automotive Industry Action Group (AIAG), 26200 Lahser Rd., Suite 200, Southfield, MI 48034.European Committee for Standardization,CEN-CENELEC Management Centre, Avenue Marnix 17, B-1000 Brussels, Belgium.This do
14、cument is not an ASTM standard and is intended only to provide the 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 a
15、s appropriate. In all cases only the current versionof the standard 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. Unit
16、ed States13.2.1 equivalent round diameter, ndiameter of a round wire having equivalent cross sectional area to a given shaped wire.3.2.2 shape factor, n a value used to obtain cross sectional area for shaped wires when multiplied by measured width andmeasured thickness.4. Ordering Information4.1 Ord
17、ers for material under this specification shall include the following information for each ordered item:4.1.1 Quantity (mass),4.1.2 Name of material (modified chromium vanadium alloy steel valve spring quality wire),4.1.3 Dimensions (Table 1 and Section 89),4.1.4 Condition (Section 67),4.1.5 Packagi
18、ng (Section 1415),4.1.6 Heat analysis report, if requested (5.26.2),4.1.7 Certification or test report, or both, if specified (Section 1314), and4.1.8 ASTM designation and year of issue.NOTE 1Atypical ordering description is as follows: 20 000-kg oil-tempered modified chromium vanadium alloy steel v
19、alve spring quality wire, size6.00 mm in 150-kg coils to ASTM _ dated _ , or for inch-pound, 40 000-lb oil-tempered modified chromium vanadium alloy steel valve springquality wire, size 0.250 in. in 350-lb coils to ASTM _ dated _ .5. Materials and Manufacture5.1 The steel mayshall be made by any com
20、mercially accepted steel making process. The steel shall be continuously cast. a steelmaking process combined with secondary ladle refining that is capable of satisfying the inclusion content requirements of thisspecification.5.2 The steel shall be continuously cast into blooms and rolled into bille
21、ts.5.3 Billet conditioning shall precede wire rod manufacture. The resulting wire rods shall be of sufficient surface quality thatwhen combined with a surface removal operation performed prior to or during the wire manufacturing operation the resulting wireshall satisfy the surface condition and dec
22、arburization requirements of this specification.5.4 The finished wire shall be free from detrimental pipe and undue segregation.5.5 Alternate manufacturing processes may be used upon agreement between purchaser and supplier provided that the minimumrequirements of this standard are met.6. Chemical C
23、omposition6.1 The steel shall conform to the requirements for chemical composition specified in Table 2.6.2 Heat AnalysisEach heat of steel shall be analyzed by the manufacturer to determine the percentage of elements prescribedin Table 2. This analysis shall be made from a test specimen preferably
24、taken during the pouring of the heat. When requested, thisshall be reported to the purchaser and shall conform to the requirements of Table 2.6.3 Product AnalysisAn analysis may be made by the purchaser from finished wire representing each heat of steel. Theaverage of all the separate determinations
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