1、Designation:A12596(Reapproved 2013)1Standard Specification forSteel Springs,Helical,Heat-Treated1This standard is issued under the fixed designation A125;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A num
2、ber in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1NOTETable references were editorially corrected in November 2013.1.Scop
3、e1.1 This specification covers hot-coiled,heat-treated helicalcompression springs with tapered,closed,squared and groundends made of hot-wrought round steel bars38in.(9.5 mm)andlarger in diameter.1.2 This specification also serves to inform the user ofpractical manufacturing limits,mechanical tests,
4、and inspec-tion requirements applicable to the type of spring described in1.1.1.3 Supplementary Requirements S1 to S8 inclusive of anoptional nature are provided.They shall apply only whenspecified by the purchaser.Details of these supplementaryrequirements shall be agreed upon by the manufacturer a
5、ndpurchaser.1.4 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.2.Referenced Documents2.1 ASTM Standards:2A29/A29M Specification for Steel
6、 Bars,Carbon and Alloy,Hot-Wrought,General Requirements forA689 Specification for Carbon and Alloy Steel Bars forSpringsE10 Test Method for Brinell Hardness of Metallic MaterialsE112 Test Methods for Determining Average Grain SizeE709 Guide for Magnetic Particle Testing3.Ordering Information3.1 Orde
7、rs for springs under this specification shall includethe following information:3.1.1 Quantity,3.1.2 Name of material,3.1.3 A drawing or list showing required dimensions andloads,and part number,3.1.4 Packaging,marking and loading,and3.1.5 End use.NOTE1A typical ordering description is:500 springs Dr
8、awing 3303Rev.A.to ASTM A125,1095 steel,for cyclical machine operation.Palletize,maximum weight 4000 lb.4.Materials and Manufacture4.1 Material:4.1.1 Unless otherwise specified,the springs shall be madeof carbon steel bars conforming to the requirements of Speci-fication A689.Due to hardenability li
9、mitations of carbon steel,it is suggested that the bar diameter be limited to 158in.(41.8mm)max in order to withstand the maximum test stressrequirements of this specification.4.1.2 If alloy steel is specified,the springs shall be madefrom alloy steel bars conforming to Specification A689.Any ofthe
10、alloy steel grades referred to may be used at the option ofthe spring manufacturer,providing that a minimum as-quenched hardness of Rockwell HRC-50 will be achieved atthe center of the bar section representing the spring whenquenched in the same media and manner as the spring.4.1.3 Springs Made from
11、 Bars Over 2 in.(50.8 mm)Notethat the bias tolerance(reference Specification A29/A29M,Table A1.1 on Permissible Variations in Cross Section forHot-Wrought Round,Square,and Round-Cornered SquareBars of Steel)of the bar diameter shall be taken into consid-eration when designing and calculating the sol
12、id height,springrate,solid stress,and solid capacity.4.2 Hardness:4.2.1 The springs must be quenched and tempered to asufficiently high hardness(strength)to withstand the stresses1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is th
13、e direct responsibility of SubcommitteeA01.15 on Bars.Current edition approved Oct.1,2013.Published November 2013.Originallyapproved in 1929.Last previous edition approved in 2007 as A125 96(2007).DOI:10.1520/A0125-96R13E01.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact
14、 ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 developed in testing the finishe
15、d spring.The maximum hard-ness shall not exceed 477 Brinell numbers(2.80 mm indenta-tion diameter).4.2.2 When hardness limits are specified,the total range orspread may not be less than 0.15 mm difference in indentationdiameters.The specified or indicated minimum hardness mustbe sufficient to develo
16、p the required strength to withstand thesolid stresses of the spring design involved.4.2.3 Hardness shall be read on a prepared flat surface in anarea not detrimental to the life of the spring at a full sectionafter removal of the decarburized layer.A tungsten-carbide10-mm ball shall be applied under a 3000-kg load and theindentation diameter converted to Brinell numbers by usingTable 1.The values for Table 1 have been taken fromSpecification E10.4.3 Metallurgical Requirements:4.3.1 The total de