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SCM440 SAE4140 1.7225 Alloy Special Steel Round Bar Annealing Or Q/T Heat Treatment Chemical composition(%): C Si Mn Cr P S Mo 0.38-0.45 0.17-0.37 0.50-0.80 0.90-1.20 ≤0.035 ≤0.035 0.15-0.25 ...