Yong Wei mold steel, DC11 die steel, linwu DC11 provided by Yong Wei steel mold. We are Dongguan City An Yongwei mold steel shop (www.dgyongwei.com) located: Dongguan, Guangdong specializes in: Die factors thermal fatigue resistance of steel, DC53, SKD11.SUS440C, SUS420 steel major impact are: ① thermal conductivity of steel . DC11 high thermal conductivity of steel sheet, the surface can reduce the metal mold degree heat, thereby reducing the tendency of the thermal fatigue of steel. 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, the mold 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. Number of factors mold steel chemical composition, grain size, purity, carbides and inclusions, morphology, size and distribution, as well as the microstructure and other heat after heat treatment systems and obtained all die steel-on-steel a great deal of impact toughness. Temper brittleness can be divided into first class and second class temper brittleness temper brittleness. The first category, also known as irreversible temper brittleness temper brittleness, mainly in the tempering temperature is 250 ~ 400 ℃, the brittleness disappears after reheating repeated in this interval temper brittleness no longer occur, the second tempering Brittle also known as reversible temper brittleness temperature occurring in the 400 ~ 650 ℃, when reheated brittleness disappears, should be quickly cooled, can not stay long or slow cooling in the range of 400 ~ 650 ℃, otherwise it will happen again catalytic phenomenon. The occurrence of temper brittleness of steel alloying elements contained in the relevant, such as manganese, chromium DC11 die steel, silicon, nickel will have tendency to temper brittleness, and molybdenum, tungsten has diminished tendency to temper brittleness. Die steel, such as 3Cr2W8V, H13,5CrNiMo, 5CrMnMo etc., using higher than conventional heating quenching quenching temperature, can reduce the number of carbides in the steel to improve its morphology and distribution, so that the solid solution of carbon in austenite distribution technology, after quenching can get more lath martensite in the steel to improve its fracture toughness and thermal fatigue resistance, thus prolonging the life of mold. For example, a thermal 3Cr2W8V steel extrusion die, the conventional quenching temperature of 1080 ~ 1120 ℃ DC11, the tempering temperature is 560 ~ 580 ℃. As we all know, this year the real estate market is very weak, the price of a continuous downward, closing the sluggish performance of the economy as a whole form a larger pressure, to a certain extent, restrict the continued development of the economy. Then, after the country have relaxed the restriction, the central bank introduced the New Deal in the end of September: the lower lending rates for the benchmark lending rate of 0.7 times the import DC11 mold, for two sets and more housing has been settled and the corresponding home purchase loans, and apply loans to buy housing, banking financial institutions should carefully grasp based on the borrower solvency, credit conditions and other factors and to specify the down payment ratio and lending rates