Optimum Spring manufactures extension, torsion and compression springs with High Tensile - Hard Drawn - ASTM A 679
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High Tensile - Hard Drawn - ASTM A 679

High-carbon spring steels are the most commonly used of all springs materials. Try to use these materials in preference to others because that are least expensive, readily available, easily worked, and most popular. These materials are not satisfactory for high or low temperatures or for shock or impact loading.

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High Tensile
Hard Drawn
ASTM A 679
Nominal Chemistry
C0.65-1.00%
Mn0.20-1.30%
Minimum Tensile Strength
psi x 103
238-350
E - Modulus of Elasticity
psi x 106
30
Design Stress % Minimum Tensile 45
G - Modulus in Torsion
psi x 106
11.5
Maximum Operating Temperature
°F
250
Rockwell Hardness C41-60
Density
lb/in3
0.284
Shear Modulus
c GPa
11600 80.0
Method of Manufacture
Chief Uses
Special Properties
Cold drawn. Higher quality springs and wire forms.
Equivalent or Common Trade Names
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