5CrNiMo steel has good toughness, strength and high wear resistance, is a hot die steel. It is almost the same as the mechanical properties at room temperature and at 500 ~ 600 ℃ when. When heated to 500 ℃, still hold about HB300 hardness. Because the steel contains molybdenum, which is not sensitive to temper brittleness. After slow cooling from 600 ℃ down only slightly lower toughness. Chemical composition Carbon C: 0.50 ~ 0.60 Si Si: ≤0.40 Manganese Mn: 0.50 ~ 0.80 Sulfur S: ≤0.030 phosphorus P: ≤0.030 chromium Cr: 0.50 ~ 0.80 Ni-Ni: 1.40-1.80 Copper Cu: ≤0.30 allow the residual content of molybdenum Mo: 0.15 ~ 0.30 2 hardness annealing, 241 ~ 197HB, indentation diameter 3.9 ~ 4.3mm [2] After three technical parameters Quenching: Quenching temperature 58 ℃: 830 ~ 860 Delivery status: annealing HB≤241 coolant: Oil Oil 4 steel shelf Specifications Product Name Specification / mm Material wire Ф5.5-30 5CrNiMo 5-100 5CrNiMo rolled sheet hot-rolled steel hot-rolled bar Ф20-100 5CrNiMo 1-100 5CrNiMo rolled round Ф200-400 5CrNiMo 5CrNiMo use range for the manufacture of a variety of complex shape, impact load, the working temperature is not too high, side length> 400mm medium-sized die forging and trimming die for the manufacture of simple shapes in general manufacturing process smelting steel vacuum refining process to ensure purity;. adoption Large professional heat treatment of steel to get the best pre-hardening effect, uniform distribution of hardness .. 5CrNiMo 5CrNiMo steel tempering process specification recommended quenching quenching temperature / ℃ cooling medium medium temperature / ℃ continuation of hardness (HRC) 830 ~ 860 Cisco quenching liquid after 20 to 40 至 150 ~ 180 ℃ tempering of 53 to 58 Note immediately: 1. large die quenching temperature using the upper limit of the small mold (side length at 200 ~ 300mm below) using the lower limit; 2. To avoid forging die great stress and strain during quenching, heating from 830 ~ 860 ℃ after first pre-cooling in air to 750 ~ 780 ℃, and then oil-cooled to about 150 ~ 180 ℃, remove and immediately tempered; 3. large mold should be placed in the furnace of 600 ~ 650 ℃ preheating, heat through and then make the furnace temperature rises; for better heating, to die on a high 60 ~ 100mm heating pad.