Historical
ASTM A230/A230M-99
Standard Specification for Steel Wire, Oil-Tempered Carbon Valve Spring Quality
This specification covers the highest quality of round carbon steel spring wire, uniform in quality and temper, intended especially for the manufacture of valve springs and other springs requiring high-fatigue properties. 1.2 The values stated in either SI (metric) units or inch-pound units are to be regarded separately as standard. The values stated in each system are not exact equivalents; therefore, each system must be used independent of the other.
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ASTM International [astm]
ASTM International [astm]