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Standard:

ASTM A230
Standard Specification for Steel Wire, Oil Tempered Carbon Valve Spring Quality

Chemistry

Element Composition, %
Carbon 0.60-0.75
Manganese 0.60-.090
Phosphorus, max 0.025
Sulfur, max 0.030
Silicon 0.15-0.35

Tensile Requirements

Diameter (Inch) Tensile Strength, KSI Min Tensile Strength, KSI Max Reduction of Area, min, %
Less than 0.062 245 265 n/a
0.062 to 0.092, incl 240 260 n/a
Over 0.092 to 0.128, incl 235 255 40
Over 0.128 to 0.162, incl 230 250 40
Over 0.162 to 0.192, incl 225 245 40
Over 0.192 to 0.225, incl 220 240 40
Over 0.225 to 0.250, incl 215 235 40
Over 0.250 210 230 40

Permissible Variations in Wire Diameter

Diameter (Inch) Permissible Plus and Minus Permissible Out of Round
Less than 0.062 0.0005 0.0005
0.062 to 0.092, incl. 0.0008 0.0008
Over 0.092 to 0.148, incl. 0.001 0.001
Over 0.148 to 0.177, incl. 0.0015 0.0015
Over 0.177 0.002 0.002

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