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1.7225 SAE4140 SCM440 Hot Rolled Alloy Tool Steel Plate Perform Standard: GB/T 3077-1999 Chemical composition(%): 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 ...