ASTM A878 / A878M - 05(2011) standard specification for steel wire, modified chromium vanadium valve spring quality

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Source: ASTM International

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 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. 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 brackets. 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)

ASTM Standards
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
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
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)

Military Standard
MIL-STD-163 Steel Mill Products, Preparation for Shipment and Storage

AIAG Standard
AIAGB-5 02.00 Primary Metals Identification Tag Application Standard

Index Terms

alloy; modified chromium vanadium; valve spring; wire: Steel springs (valve)--specifications; Steel wire (chromium alloy)--specifications; Chromium-vanadium alloy--specifications; Steel springs--specifications;

ICS Code

ICS Number Code 77.140.25 (Spring steels)

DOI: 10.1520/A0878_A0878M-05R11

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