grade Composition Yield strength Hardness (HRC) Comments (ASTM grade) Typical Maximum 1070 0.65-0.75% C, 0.60-0.90% Mn, max .050% S, max .04...
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... annealed 165vpn 180vpn CS70, CK67, C70E /1075 0.70–0.80% C, 0.50–0.80% Mn, max. 0.030% P, max. 0.035% S 62–78 ksi (430–530 ......
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