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AISI / SAE 4340 ALLOY STEEL CHEMICAL ANALYSIS C% Carbon 0.38 – 0.43 Mn% Manganese 0.6 – 0.8 max P% Phosphorus 0.035 max S% Sulfur 0.040 max Si% Silicon 0.15 – 0.3 Ni% Nickel 1.65 – 2.0 Cr% Chromium 0...