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ASME A182 F22 CL3 Alloy Steel Hot Forged Valve Part Blanks Element(%): F22CL3 C 0.05~0.15 Mn 0.3~0.6 P≤ 0.040 S≤ 0.040 Si≤ 0.50 Ni ... Cr 2.20~2.50 Mo ...