1、Designation: A 764 07Standard Specification forMetallic Coated Carbon Steel Wire, Coated at Size andDrawn to Size for Mechanical Springs1This standard is issued under the fixed designation A 764; the number immediately following the designation indicates the year oforiginal adoption or, in the case
2、of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript 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. Scope*1.1 This speci
3、fication covers two finishes of round, metalliccoated, hard-drawn, carbon steel spring wire having propertiesand quality for the manufacture of mechanical springs and wireforms that are not subject to high stress or require high fatigueproperties.1.2 The values stated in inch-pound units are to be r
4、egardedas the standard. The values stated in SI units are for informa-tion purposes only.2. Referenced Documents2.1 ASTM Standards:2A 90/A 90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA 370 Test Methods and Definitions for Mechanical Testingof
5、Steel ProductsA 428/A 428M Test Method for Weight Mass of Coatingon Aluminum-Coated Iron or Steel ArticlesA 510 Specification for General Requirements for WireRods and Coarse Round Wire, Carbon SteelA 700 Practices for Packaging, Marking, and LoadingMethods for Steel Products for ShipmentA 751 Test
6、Methods, Practices, and Terminology forChemical Analysis of Steel ProductsB6 Specification for ZincB 750 Specification for GALFAN (Zinc-5 % Aluminum-Mischmetal) Alloy in Ingot Form for Hot-Dip CoatingsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2
7、.2 U.S. Government Standards:3Fed. Std. No. 123 Marking for Shipment (Civil Agencies)MIL-STD-129 Marking for Shipment and Storage2.3 Automotive Industry Action Group Standard:4AIAG B-5 02.00 Primary Metals Identification Tag Appli-cation Standard3. Terminology3.1 Definitions:3.1.1 coating class (reg
8、ular, 1, or 3)specifies the mini-mum coating weight per unit area of uncoated wire surface.Aluminum coated wire is only specified in one class.3.1.2 coating finish (1 or 2)specifies whether a coating isapplied prior to or after the final cold drawing operation.3.1.3 coating type (A, B, or C)specifie
9、s the required alloycontent of the coating.3.1.4 tensile class (I or II)specifies the tensile range towhich the wire is to conform.4. Ordering Information4.1 Orders for material under this specification shouldinclude the following information:4.1.1 Quantity (weight),4.1.2 Diameter, finish, class of
10、coating if applicable, type ofmetallic coating, class of tensile strength, name of material,4.1.3 ASTM designation and date of issue,4.1.4 Packaging (Section 15),4.1.5 Cast or heat analysis report, if desired (Section 6), and4.1.6 Test report, if desired (Section 14).NOTE 1A typical ordering descrip
11、tion is as follows: 30 000 lb 0.120in. Finish 2, Class 1, Type B Metallic Coating, Tensile Class II, SteelMechanical Spring Wire in 400-lb, 22-in. coils to ASTM A 764, dated.5. Materials and Manufacture5.1 The base metal of the wire shall be of good commercialquality steel. The steel may be either i
12、ngot cast or strand cast.5.2 A sufficient discard shall be made to ensure freedomfrom injurious piping and undue segregation.5.3 The wire shall be cold drawn to produce the desiredmechanical properties.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and R
13、elated Alloys and is under the direct responsibility ofSubcommittee A01.03 on Steel Rod and Wire.Current edition approved March 1, 2007. Published March 2007. Originallyapproved in 1979. Last previous edition approved in 2001 as A 764 95 (2001).2For referenced ASTM standards, visit the ASTM website,
14、 www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk, Bldg. 4, Section D,700 Robbins Ave., Philadelphia, PA 19111-50
15、94, ATTN: NPODS.4Available from Automotive Industry Action Group, 26200 Lahser Rd., Suite200, Southfield, MI 48034, www.aiag.org.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, Unit
16、ed States.5.4 Each coil shall be of one continuous length. Only weldsmade prior to cold drawing are permitted, unless otherwiseagreed upon at the time of the purchase or contract.5.5 The material shall be metallic coated prior to colddrawing, or at an intermediate stage of cold drawing (Finish 1),or
17、 shall be metallic coated after the final cold drawing (Finish2).5.6 The wire shall be furnished with one of three types ofmetallic coating, as specified:5.6.1 Type AAluminum coated (aluminized),5.6.2 Type BZinc coated (galvanized), or5.6.3 Type CZinc-5 % aluminum-mischmetal (Zn-5Al-MM) alloy coated
18、.5.7 Coating Types A and C shall be produced by a hot-dipprocess. Coating Type B may be produced by either a hot-dipor an electrolytic process at the option of the producer.5.8 The slab zinc for Coating Type B shall be any grade ofzinc conforming to Specification B6.5.9 The ingot used for Coating Ty
19、pe C shall conform toSpecification B 750.6. Chemical Requirements Chemical Requirements6.1 The steel shall conform to the requirements for chemicalcomposition prescribed in Table 1.6.2 Cast or Heat AnalysisEach cast or heat of steel shallbe analyzed by the manufacturer to determine compliance withth
20、e percentage of elements prescribed in Table 1. This analysisshall be from a test specimen preferably taken during thepouring of the cast or heat. When required, this shall bereported to the purchaser.6.3 Product AnalysisAn analysis may be made by thepurchaser from finished wire representing each ca
21、st or heat ofsteel. The chemical composition thus determined, as to ele-ments required or restricted, shall conform to the productanalysis requirements specified in Table 10 of SpecificationA 510.6.4 For referee purposes, Test Methods, Practices, andTerminology A 751 shall be used.7. Mechanical Requ
22、irements7.1 Tension Test:7.1.1 RequirementsThe material as represented by tensiontest specimens shall conform to the requirements prescribed inTable 2 or Table 3 for the various sizes and specified class.7.1.2 Test MethodThe tension test shall be made inaccordance with Test Methods A 370, Supplement
23、 IV.7.2 Wrap Test:7.2.1 RequirementFinish 1 (drawn to size metallic coated)wire shall withstand wrapping on a mandrel as shown in Table4 without the steel base fracturing or the metallic coatingpeeling or flaking to such an extent that coating metal can beremoved by rubbing with the bare fingers. Fi
24、nish 2 (metalliccoated at size) wire shall withstand wrapping on a mandrel asshown in Table 5 without the steel base fracturing or themetallic coating peeling or flaking to such an extent thatcoating metal can be removed by rubbing with the bare fingers.Loosening or detachment, during the wrap test,
25、 of superficial,small particles of coating metal formed by mechanical polish-ing of the metallic coated wire shall not be considered cause forrejection.7.2.2 Test MethodThe wrap test shall be made in accor-dance with Test Methods A 370, Supplement IV.7.3 Metallic Coating.7.3.1 Requirement:7.3.1.1 Fo
26、r metallic coating Type A, the wire shall conformto the minimum weight of coating prescribed in Table 6.7.3.1.2 For metallic coating Type B or Type C, the wire shallconform to the minimum weight of coating for Coating Class1 or 3 prescribed in Table 7. Regular coating has no minimumrequirement.7.3.2
27、 Test Methods:7.3.2.1 The weight of coating test for metallic coating TypeA shall be made in accordance with Test Method A 428/A 428M.7.3.2.2 The weight of coating test for metallic coating TypeB or Type C shall be made in accordance with Test MethodA 90/A 90M.8. Dimensions and Permissible Variation
28、s8.1 The diameter of the wire shall not vary from thatspecified by more than the tolerances specified in Table 8 orTable 9.9. Workmanship, Finish, and Appearance9.1 The surface of Finish 1, drawn metallic coated wire,shall be smooth and free from defects such as seams, pits, diemarks, and other defe
29、cts tending to impair the use of the wirefor springs.9.2 The surface of Finish 2, metallic coated at wire size,shall be free of slivers, scale, and other defects tending toimpair the use of this wire for springs. The metallic coatingshall be smooth and continuous. If a sample does not demon-strate a
30、 smooth and continuous coating, one sample shall be cutfrom each end of the coil and examined.9.3 The wire shall be packaged so that it can be unwound ina trouble-free manner.10. Sampling10.1 Alot shall consist of all of the coils of wire of the samesize, type of coating, tensile strength class, met
31、allic coatingtype, finish, and heat or cast offered for inspection at one time.A wire sample of sufficient length, approximately 4 ft (1.2 m),shall be cut from either end of each coil selected for testsdescribed in 7.1, 7.2, and 7.3.11. Number of Tests and Retests11.1 The number of test specimens ta
32、ken from the ends ofcoils during production to ensure compliance with 7.1, 7.2, andTABLE 1 Chemical RequirementsElement Composition, %Carbon 0.450.85AManganese 0.301.30BPhosphorus, max 0.040Sulfur, max 0.050Silicon 0.100.35ACarbon in any one lot shall not vary by more than 0.13 %.BManganese in any o
33、ne lot shall not vary by more than 0.30 %.A7640727.3 varies with the quality control procedures and the manu-facturing facilities of each manufacturer, but is generally notless than 10 % of the coils produced. For the purpose of finalproduct testing, one specimen from every ten coils, or afraction t
34、hereof, in a lot shall be selected at random, or a totalof seven specimens, whichever is less.11.2 Should one or more of the wire specimens fail anyrequirement, the lot shall be subjected to retest. For retestpurposes the original lot shall be regrouped into 50 coil lots orfractions thereof. Each lo
35、t shall be tested for the property inwhich the original sample failed to comply at a frequency of10 % or more so that the total number of tests is at least doublethe original. Any lot that exhibits a failure shall be rejected.The manufacturer may test each coil in the failed lot for theproperty in w
36、hich failure occurred and reject only the noncon-forming coils.11.3 If any test specimen exhibits obvious imperfectionsdue to cutting a sample from the coil or due to handlingdamage after the sample has been cut, it may be discarded andanother specimen substituted.12. Inspection12.1 Unless otherwise
37、 specified in the contract or purchaseorder, the manufacturer is responsible for the performance ofall inspection and test requirements specified in this specifica-tion. Except as otherwise specified in the contract or purchaseorder, the manufacturer may use his own or any other suitablefacilities f
38、or the performance of the inspection and testrequirements unless disapproved by the purchaser at the timeTABLE 2 Tensile RequirementsAFinish 1 (Drawn to Size Metallic Coated), Regular or Class 1 Coating (One Class on Coating Type A)Wire Diameter,Bin. (mm)Tensile Class I Tensile Class IITensile Stren
39、gth, ksi (MPa) Tensile Strength, ksi (MPa)min max min max0.032 (0.81)C253 (1740) 306 (2110) 292 (2010) 347 (2390)0.035 (0.89)C248 (1710) 301 (2080) 287 (1980) 342 (2360)0.041 (1.04)C242 (1670) 293 (2020) 279 (1920) 332 (2290)0.048 (1.22)C236 (1630) 286 (1970) 273 (1880) 325 (2240)0.054 (1.37) 231 (1
40、590) 279 (1920) 266 (1830) 316 (2180)0.062 (1.57) 225 (1550) 272 (1880) 259 (1790) 308 (2120)0.072 (1.83) 220 (1520) 266 (1830) 254 (1750) 301 (2080)0.080 (2.03) 216 (1490) 261 (1800) 249 (1720) 296 (2040)0.092 (2.34) 209 (1440) 253 (1740) 241 (1660) 287 (1980)0.106 (2.69) 205 (1410) 248 (1710) 237
41、(1630) 281 (1940)0.120 (3.05) 200 (1380) 241 (1660) 230 (1590) 273 (1880)0.135 (3.43) 196 (1350) 237 (1630) 226 (1560) 269 (1850)0.148 (3.76) 193 (1330) 234 (1610) 223 (1540) 266 (1830)ATensile strength values for intermediate diameters may be interpolated.BDecimal size is rounded to three significa
42、nt places in accordance with Practice E29.CThese sizes are not produced with metallic coating Type A.TABLE 3 Tensile RequirementsAFinish 2 (Metallic Coated at Size) Regular, Class 1 or Class 3 Coating (One Class on Coating TypeA)Wire Diameter,Bin. (mm)Class I Class IITensile Strength, ksi (MPa) Tens
43、ile Strength, ksi (MPa)min max min max0.062 (1.57)C213 (1470) 272 (1880) 232 (1600) 291 (2010)0.072 (1.83)C209 (1440) 266 (1830) 227 (1570) 284 (1960)0.080 (2.03) 204 (1410) 261 (1800) 223 (1540) 280 (1930)0.092 (2.34) 198 (1370) 253 (1740) 216 (1490) 271 (1870)0.106 (2.69) 194 (1340) 248 (1710) 212
44、 (1460) 266 (1830)0.120 (3.05) 189 (1300) 241 (1660) 206 (1420) 258 (1780)0.135 (3.43) 185 (1280) 237 (1630) 202 (1390) 254 (1750)0.148 (3.76) 183 (1260) 234 (1610) 200 (1380) 251 (1730)0.162 (4.11) 180 (1240) 230 (1590) 196 (1350) 246 (1700)0.177 (4.50) 176 (1210) 225 (1550) 192 (1320) 241 (1660)0.
45、192 (4.88) 173 (1190) 221 (1520) 189 (1300) 237 (1630)0.207 (5.26) 171 (1180) 218 (1500) 186 (1280) 233 (1610)0.225 (5.72)C167 (1150) 214 (1480) 183 (1260) 230 (1590)0.250 (6.35)C164 (1130) 210 (1450) 179 (1230) 225 (1550)ATensile strength values for intermediate diameters may be interpolated.BDecim
46、al size is rounded to three significant places in accordance with Practice E29.CThese sizes are not produced with metallic coating Type A.TABLE 4 Mandrel Diameters for Steel Ductility and Adherenceof Metallic Coating Test for Finish 1 Wire (Drawn to Size MetallicCoated)Wire Diameter Mandrel Diameter
47、in. mm Class ITensileClass IITensile0.032 to0.148 incl0.81 to 3.76incl1DA2DAD equals nominal wire diameter being tested. For 1D mandrel, wire may bewound on itself.A764073the order is placed. The purchaser shall have the right toperform any of the inspections and tests set forth in thisspecification
48、 when such inspections and tests are deemednecessary to ensure that the material conforms to prescribedrequirements.13. Rejection and Rehearing13.1 Unless otherwise specified, any rejection based on testsmade in accordance with this specification shall be reported tothe manufacturer within a reasona
49、ble length of time afterreceipt of the material.13.2 The material must be adequately protected and cor-rectly identified in order that the producer may make a properinvestigation.14. Certification14.1 When specified on the purchase order or contract, amanufacturers or suppliers certification shall be furnished tothe purchaser that the material was manufactured, sampled,tested, and inspected in accordance with this specification andhas been found to meet the requirements. When specified in thepurchase order or contract, a report of the test results shall befur
