5CrNiMoV 
 China Brand: 5CrNiMoV types of steel: high resistance to wear a hot forging die steel, chemical composition: Element C Si Mn PS Cr Mo Ni V 
 Content of 0.5 ~ 0.6 ≤ 0.35 0.5 ~ 0.8 ≤ 0.03 ≤ 0.03 0.8 ~ 1.1 0.35 ~ 0.5 1.4 ~ 1.8 0.1 ~ 0.3 
 Second, the main components of the design features of smelting characteristics * characteristics: toughness, high strength, good wear resistance. * The use of electric arc furnace (EAF) + refining (LF) + vacuum (VD) of die steel production of high purity, good performance. Heat treatment * Annealing :760-780 ℃ hardness :197-241HB * quenching temperature :890-910 ℃, oil cooling, hardness: 61.5HRC * tempering temperature :420-550 ℃, twice tempered hardness :38-47HRC ※ * The steel in the air cooling that can be hardened, and easy to form white spots, so slow cooling after forging. ※ For large forgings, must be placed in the oven at 600 ℃, the temperature consistent, and then slowly cooled to 150-200 ℃, then cooled in the air. ※ For large forgings, it is recommended to 150-200 ℃ in the cooling immediately after the tempering heat. Third, the performance advantages and uses (1), highlighting the advantages * Good hardenability * strength * Excellent abrasion resistance (2) use this type of steel used to make a variety of large and medium-sized forging die. Physical nature of the temperature coefficient of expansion * / ℃ 100 ~ 250 250 ~ 300 350 ~ 600 600 ~ 700 
 Expansion coefficient / ℃ -1 12.55 * 10-6 14.1 * 10-6 14.2 * 10-6 15 * 10-6