ASTM A878 A878M-2005(2011) Standard Specification for Steel Wire Modified Chromium Vanadium Valve Spring Quality《经修订的铬钒电子管弹簧钢丝质量的标准规格》.pdf
《ASTM A878 A878M-2005(2011) Standard Specification for Steel Wire Modified Chromium Vanadium Valve Spring Quality《经修订的铬钒电子管弹簧钢丝质量的标准规格》.pdf》由会员分享,可在线阅读,更多相关《ASTM A878 A878M-2005(2011) Standard Specification for Steel Wire Modified Chromium Vanadium Valve Spring Quality《经修订的铬钒电子管弹簧钢丝质量的标准规格》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: A878/A878M 05 (Reapproved 2011)Standard 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 the case of
2、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 roundmodified chromium vanadium alloy steel va
3、lve spring wire,uniform in quality and temper, intended for the manufacture ofvalve springs and other springs requiring high-fatigue proper-ties when used at moderately elevated temperatures. This wireshall be either in the annealed and cold-drawn or oil-temperedcondition as specified by purchaser.1
4、.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. Within the text, theinch-pound units are shown in brackets. The values stated ineach system are not exact equivalents; therefore, each systemmust be used independent of the other.2. Referenced Docum
5、ents2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA700 Practices for Packaging, Marking, and Loading Meth-ods for Steel Products for ShipmentA751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel ProductsE29 Practice for Using Sig
6、nificant Digits in Test Data toDetermine Conformance with SpecificationsE45 Test Methods for Determining the Inclusion Content ofSteel2.2 Federal Standard:3Fed. Std. No. 123 Marking for Shipment (Civil Agencies)2.3 Military Standard:3MIL-STD-163 Steel Mill Products, Preparation for Ship-ment and Sto
7、rage2.4 AIAG Standard:4AIAG B-5 02.00 Primary Metals Identification Tag Appli-cation Standard3. Ordering Information3.1 Orders for material under this specification shall includethe following information for each ordered item:3.1.1 Quantity (mass),3.1.2 Name of material (modified chromium vanadiumal
8、loy steel valve spring quality wire),3.1.3 Dimensions (Table 1 and Section 8),3.1.4 Condition (Section 6),3.1.5 Packaging (Section 14),3.1.6 Heat analysis report, if requested (5.2),3.1.7 Certification or test report, or both, if specified (Sec-tion 13), and3.1.8 ASTM designation and year of issue.N
9、OTE 1A typical ordering description is as follows: 20 000-kgoil-tempered modified chromium vanadium alloy steel valve springquality wire, size 6.00 mm in 150-kg coils toASTM _ dated _ , or forinch-pound, 40 000-lb oil-tempered modified chromium vanadium alloysteel valve spring quality wire, size 0.2
10、50 in. in 350-lb coils to ASTM _dated _ .4. Materials and Manufacture4.1 The steel may be made by any commercially acceptedsteel making process. The steel shall be continuously cast.4.2 The finished wire shall be free from detrimental pipeand undue segregation.5. Chemical Composition5.1 The steel sh
11、all conform to the requirements for chemicalcomposition specified in Table 2.5.2 Heat AnalysisEach heat of steel shall be analyzed bythe manufacturer to determine the percentage of elementsprescribed in Table 2. This analysis shall be made from a testspecimen preferably taken during the pouring of t
12、he heat.When requested, this shall be reported to the purchaser andshall conform to the requirements of Table 2.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.03 on Steel Rod and Wire
13、.Current edition approved Nov. 1, 2011. Published November 2011. Originallyapproved in 1987. Last previous edition approved in 2005 as A878/A878M 05.DOI: 10.1520/A0878_A0878M-05R11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.or
14、g. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-50984Available from Automotive Industry Action Group (AIAG
15、), 26200 Lahser Rd.,Suite 200, Southfield, MI 48034.1*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 19428-2959, United States.5.3 Product AnalysisAn analysis may be made by thepurchaser from fi
16、nished wire representing each heat of steel.The average of all the separate determinations made shall bewithin the limits specified in the analysis column. Individualdeterminations may vary to the extent shown in the productanalysis tolerance column, except that the several determina-tions of a sing
17、le element in any one heat shall not vary bothabove and below the specified range.5.4 For referee purposes, Test Methods, Practices, andTerminology A751 shall be used.6. Mechanical Properties6.1 Annealed and Cold DrawnWhen purchased in theannealed and cold-drawn condition, the wire shall have beengi
18、ven a sufficient amount of cold working to meet the purchas-ers coiling requirements and shall be in a suitable condition torespond properly to heat treatment. In special cases thehardness, if desired, shall be stated in the purchase order.6.2 Oil TemperedWhen purchased in the oil-temperedcondition,
19、 the tensile strength and % R.A. shall conform to therequirements prescribed in Table 3.6.2.1 Number of TestsOne test specimen shall be taken foreach five coils, or fraction thereof, in a lot. Each heat in a givenlot shall be tested.6.2.2 Location of TestsTest specimens shall be taken fromeither end
20、 of the coil.6.2.3 Test MethodThe tension test shall be made inaccordance with Test Methods and Definitions A370.6.3 Wrap Test:6.3.1 Oil-tempered or cold-drawn wire 4.00 mm 0.162 in.and smaller in diameter shall wind on itself as an arbor withoutbreakage. Larger diameter wire up to and including 8.0
21、0 mm0.312 in. in diameter shall wrap without breakage on amandrel twice the wire diameter. The wrap test is not appli-cable to wire over 8.00 mm 0.312 in. in diameter.6.3.2 Number of TestsOne test specimen shall be taken foreach five coils, or fraction thereof, in a lot. Each heat in a givenlot shal
22、l be tested.6.3.3 Location of TestsTest specimens shall be taken fromeither end of the coil.6.3.4 Test MethodThe wrap test shall be made in accor-dance with Test Methods and Definitions A370.6.4 Special Surface InspectionWhen specified, the entirelength of every coil shall be inspected for surface i
23、mperfectionswith a magnetic or eddy current defect analyzer, or both, orequivalent. The defect depth of this surface inspection shall beagreed upon between the manufacturer and the purchaser. Alldetected defects shall be properly marked so the purchaser hasthe ability to identify and discard that le
24、ngth of wire.7. Metallurgical Requirements7.1 Surface Condition:7.1.1 The surface of the wire as received shall be free ofimperfections such as pits, die marks, scratches, seams, andother defects tending to impair the fatigue value of the springs.7.1.2 Number of TestsOne test specimen shall be taken
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