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1.1 This specification covers a quality of round and shaped plain carbon and alloy steel spring wire, uniform in quality and temper, intended for the manufacture of mechanical springs that can withstand moderate fatigue stresses over some relatively low number of cycles. The quality level is between the commercial quality grades of wire such as Specifications A401, A231, and A229 and the valve spring quality grades such Specifications as A230, A232, A877 and A878. It is similar to the grade TD (referenced in EN 10270-2) intended for medium fatigue levels, such as required for clutch springs. 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, the inch-pound units are shown in parentheses. The values stated in each system are not exact equivalents; therefore, each system must be used independent of the other.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A229/A229M Specification for Steel Wire, Oil-Tempered for Mechanical Springs
A230/A230M Specification for Steel Wire, Oil-Tempered Carbon Valve Spring Quality
A231/A231M Specification for Chromium-Vanadium Alloy Steel Spring Wire
A232/A232M Specification for Chromium-Vanadium Alloy Steel Valve Spring Quality Wire
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A401/A401M Specification for Steel Wire, Chrome-Silicon Alloy
A700 Practices for Packaging, Marking, and Loading Methods for Steel Products for Domestic Shipment
A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
A877/A877M Specification for Steel Wire, Chrome-Silicon Alloy Valve Spring Quality
A878/A878M Specification for Steel Wire, Modified Chromium Vanadium Valve Spring Quality
A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E45 Practice for Determining the Inclusion Content of Steel
Federal StandardFed.Std.No.123 Marking for Shipment (Civil Agencies)
Military StandardMIL-STD-163 Steel Mill Products, Preparation for Shipment and Storage
AIAG StandardAIAGB-502.00 Primary Metals Identification Tag Application Standard
European StandardEN10270-2 Steel Wire for Mechanical Springs Part 2: Oil-Hardened and Tempered Springsteel Wire of Unalloyed and Alloyed Steels
ICS Number Code 77.140.25 (Spring steels)
UNSPSC Code 31152200(Non electric iron and steel wire)