The carbon content of the steel and alloying elements are often, it's thermal conductivity is poor. If heated too quickly, is bound to cause a lot of thermal stress tungsten steel DA50, this may not only cause heating of the workpiece becomes open, but the quality of heat treatment is unfavorable. Therefore, high carbon steel, high alloy steel, high speed steel type of steel must be heated slowly (or define certain heating rate), sometimes even before heating to the desired temperature once or twice to warm up. Such as high speed steel hardening, preheating it twice. According to the latest market report on the well-known steel information organizations "My iron and steel" offer, last week, the domestic spot steel price index pulled back slightly to close at 111.11 points, down 0.08 percent week. Market participants observed last week and billet steel futures price linkage to rise, driven by a significant increase in confidence in the spot steel market. But by this week, futures and billet prices both correction, spot steel prices also will adjust the downstream is slowed down the speed of purchase. According to the needs of the domestic iron and steel enterprises mold and die manufacturing development trend of the market, seize develops high-precision, high toughness, corrosion resistance, high-quality new varieties of mold steel, making domestic hot and cold work die steel reached world advanced level . Shantou mold steel is the basis for industrial production technology and equipment, with mold parts with high accuracy, high complexity, high consistency, high productivity and low consumption advantages of tungsten steel A10, with the rapid development of industry, China's mold manufacturing huge space for development. It is predicted that in 2010 ~ 2015, China's mold industry with an average annual growth rate will be around 10%, in 2015 - 2020 at 8% or so. According to the "mold industry," second five "development plan", to 2015, China's total sales will reach 174 billion yuan mold, of which exports accounted for about 15 percent die, that is about $ 4 billion; domestic market, domestic self-made molds rate of more than 85% tungsten steel imports FD15, the proportion of high-grade die more than 40%; the elimination of cold work hardening, recrystallization, refining and homogenizing tissue. Recrystallization annealing, in order to continue processing and may be used at a relatively high temperature heating: Ac1 above 50-150 ° C, there are many kinds of steel phase transformation may occur. After changing furnace cooling. If, after recrystallization for direct use, then the need to control the grain size of the tungsten, it should be at a relatively low temperature, such as the general steel is heated at 650-700 ° C. Holding time for a relatively large cross-sectional size of the pieces by 3-4min / mm, for relatively small pieces generally holding time more than 2-3 hours. Cooling annealing method. In fact, the temperature and the degree of recrystallization is largely dependent on the amount of deformation. If the conditions can be considered full recrystallization heating temperature according to the recrystallization of the metal. AsiaVest steel mold (Figure) | CD650 Tungsten | Tungsten liangping provided by Dongguan City An Yongwei steel mold shop. "Die steel, DC53, SKD11.SUS440C, SUS420" preferred Dongguan City An Yongwei steel mold shop (2), the company is located at: 3 A, Dongguan City Changan Ha Kong, the first industrial zone, over the years, Yong Wei mold steel stick providing customers with the best quality service, contact: Simon / R. Welcome to the new and old customers call, letter, visit the guide, business negotiations. Yong Wei mold steel expect to be your long term partner!