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45 # steel High Precision Hard Chromed Piston Rod for Shock Absorber from automotive RAW MATERIAL OF STEELS S 0.02%-0.04% C 0.32%-0.39% Si ≤0.4% Mn 0.5%-0.8% P ≤0.045% Cr ≤0.20% Gu ≤0.20% Ni ≤0.15% Al ...