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Special Steel Alloy Engineering Steel Bar (SCM440, SAE4140, 1.7225, EN19) Perform Standard: GB/T 3077-1999 C Si Mn Cr Mo P S Ni 0.38~0.45 0.17~0.37 0.60~0.90 0.90~1.20 0.15-0.25 ≤0.018 ≤0.030 ≤0.012 1...