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NICKEL-CHROMIUM-MOLYBDENUM STEELS BS : 970 SAE/AISI IS:3930IS:4432IS:5517 C% Mn% Si% Cr% Ni% Mo% EN16   35Mn6Mo3 0.32/0.40 1.30/1.80 0.10/0.35     0.20/0.35 EN19 4140 40Cr4 Mo3 0.38/0.45 0.50/0.80 0.10/0.35 0.90/1.20   0.20/0.35 EN24 4340 40Ni6Cr4Mo3 0.35/0.45 0.40/0.70 0.10/0.35 0.90/1.30 1.25/1.75 0.20/0.35 EN25   31Ni10Cr3Mo6 0.27/0.35 0.50/0.70 0.10/0.35 0.50/0.80 2.30/2.80 0.40/0.70 EN36   13Ni3Cr 80 0.15/0.18