Heat treatment :( Delivery Status: Brinell hardness HBW10 / 3000 (less than equal to 235)), quenching: 790 degrees + -15 degrees preheat 1,000 degrees (salt bath) or 1010 degrees (oven controlled atmosphere) + - 6 degrees heating , air-cooled heat 5 ~ 15min, 550 degrees + -6 degrees tempering; annealing, thermal processing; characteristics and uses: H13 air introduced from the United States hardened hot work die steel. Its performance, usage and 4Cr5MoSiV steel basically the same, but because of its higher vanadium content, so the temperature (600 degrees) performance than 4Cr5MoSiV steel, hot work die steel is so widely used as a representative steel.