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34CrMo4 Alloy Structural Steel-1.7220 | 35CrMo4 | 4130 ...34CrMo4 Steel is a high quality Quenched and Tempered Alloy Structural steel, It belong to the high quality low carbon,Low alloy chromium, molybdenum, nickel case hardening steel. Oil Quenched & Tempered Hardness is 18-22 HRc.