Factors affecting the thermal fatigue resistance of steel are mainly: ① steel thermal conductivity. The high thermal conductivity of steel, a metal mold can reduce the degree of the surface is heated, thereby reducing the tendency of the steel to thermal fatigue. Generally believed that thermal conductivity and cooperation related to the amount of carbon steel, high carbon content when low thermal conductivity, so not hot work die steel with high carbon steel. Commonly used in the production of carbon steel (C0.3% 5 ~ 0.6%) combined carbon content is too low. Causes the decrease in the hardness and strength of steel. Is disadvantageous. Critical point ② Steel. The critical point is usually steel (Acl) is higher. The lower steel thermal fatigue bias. Steel mold steel very tough in the work process ASP23 rod, die to bear the brunt of the load, in order to reduce the use of the process of breaking, chipping and other forms of damage, mold steel requires a certain degree of toughness. Factors number of die steel chemical composition, grain size ASP23 suppliers, purity, carbides and inclusions, morphology, size and distribution, as well as the microstructure and other heat after heat treatment systems and the resulting mold steel have a great impact on the toughness of the steel. Shoddy material surface is easy to crack because it is blank adobe, adobe many pores, adobe in the process due to the cooling effect of the thermal stress cracks, after the rolling had cracks. No shoddy steel metallic luster, pale red color of pig iron or similar reasons two two, it's blank is adobe. 2, shoddy-rolling temperature is not standard, they are visually steel temperature, so that can not be prescribed by rolling austenite region, the natural properties of steel can not be reached. Important uses for steel and alloys, sometimes using more than twice tempered. For tool steel, tool steel, steel casting molds, stamping die steel, hot die steel, cold work die steel, tool steel and high carbon cars than the steel can be processed using this technology. To a certain extent to suitably increase the hardness level, improve the dimensional stability, and further eliminate the residual austenite ASP23 clinker eliminate thermal stress and stresses caused by the previous tempering. For high-speed steel is often carried out three times or more tempered. Iron ore price downturn, the supply of iron ore to China had a profound impact. Direct impact on the domestic mining began large-scale production. With the high cost mines are gradually out of the market, the end of September of iron ore fines mine capacity utilization rate 61.8%, dropped 17 percentage points over the beginning of high cost of iron ore mining, most of mine at a depth of about 300 m the survey showed that iron ore production costs Shanxi, Liaoning region (not included) Mainstream between $ 90-110. In addition, iron ore companies also bear certain taxes, in 2014 a quarter of China Steel Association announced corporate tax burden of iron ore mine average rate of 21%, up to 30%, taxes have more than 20 projects. ASP23 manufacturers, Wulong ASP23, Yong Wei steel mold provided by the 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!