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EN30B   835M30  Technical Data EN30B is a 4¼% nickel air/oil hardening steel. It achieves a good through hardness with high strength and toughness. It is capable of taking a good polish and is widely used as a plastic mould steel. TYPICAL ANALYSIS     C. Si. Mn Ni. Cr. Mo. 0.35% 0.25% 0.50%  4.25% 1.20% 0.30% Forging: Heat slowly and uniformly to uniformly to 1050°C. After forging cool slowly. Annealing: Heat uniformly to 630/650°C. Soak well and cool slowly in the furnace. Hardening: Pre heat slowly yo 650/700°C and thoroughly soak. Continue heating to the final hardening temperature of 830/850°C and allow the component to be heated through. Quench in oil or cool in air. Tempering: Heat uniformly and thoroughly at the selected tempering temperatures and hold for one hour per inch of total thickness. Tempering °C 150 250   350     450 HRc 49 47 44 38