ASTM A878 / A878M - 19
Standard Specification for Steel Wire, Modified Chromium Vanadium Valve Spring Quality
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Abstract
This specification covers the highest quality of round modified chromium vanadium alloy steel valve spring wires, uniform in quality and temper, intended for the manufacture of valve springs and other springs requiring high-fatigue properties when used at moderately elevated temperatures. This wire shall either be in the annealed and cold-drawn or oil-tempered condition. The steel shall be subjected to continuous casting and be free from detrimental pipe and undue segregation. Heat and product analysis shall conform to the chemical requirements for carbon, manganese, phosphorus, sulfur, silicon, chromium, and vanadium. Mechanical properties shall be determined by the following: annealing and cold-drawing, oil tempering, wrap testing, and special surface inspection. In the oil-tempered condition, steel shall conform to the tensile requirements for different wire diameters. Metallurgical characterization shall include surface condition, decarburization, and inclusion content. The wire or wire rod shall conform to the maximum inclusion content requirements for the surface and core zones.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1. Scope
1.1 This specification covers the highest quality of round and shaped modified chromium vanadium alloy steel valve spring wire, uniform in quality and temper, intended for the manufacture of valve springs and other springs requiring high-fatigue properties when used at moderately elevated temperatures. It is similar to the grade VD (referenced in EN 10270-2) intended for high fatigue levels. This wire shall be either in the annealed and cold-drawn or quenched and 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 brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independent of the other. Combining values from the two systems may result in non-conformance with the standard.
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
European Standard
EN10270-2 Steel Wire for Mechanical Springs Part 2: Oil-Hardened and Tempered Spring Steel Wire of Unalloyed and Alloyed SteelsASTM Standards
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A700 Guide for Packaging, Marking, and Loading Methods for Steel Products for Shipment
A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys
E8/E8M Test Methods for Tension Testing of Metallic Materials
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E45 Test Methods for Determining the Inclusion Content of Steel
Federal Standard
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)ICS Code
ICS Number Code 77.140.25 (Spring steels)
Referencing This Standard
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DOI: 10.1520/A0878_A0878M-19
Citation Format
ASTM A878 / A878M-19, Standard Specification for Steel Wire, Modified Chromium Vanadium Valve Spring Quality, ASTM International, West Conshohocken, PA, 2019, www.astm.org
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