The carbon content of the steel and alloying elements have an important impact on the quench cracking tendency of steel. In general import MH51, with increasing carbon content of martensite, brittle martensite increases, reducing the brittle fracture strength of steel, increasing the tendency of quenching cracks. When the carbon content increases, thermal stress on the weakened tissue stress enhancement. When quenching in water, the surface compressive stress of the workpiece becomes small, and the maximum value of the tensile stress near the middle of the surface. When quenching in oil, the surface tensile stress becomes larger. All these have increased the quench cracking tendencies. Die steel by cryogenic treatment (-196 ℃), can improve the mechanical properties MH51 wholesalers, some die after cryogenic treatment significantly increased service life. Cryogenic steel mold can be MH51 between quenching and tempering process can also be carried out cryogenic treatment after quenching and tempering. If you still retain residual austenite in quenched and tempered steels, then after cryogenic treatment remains tempered once again. Cryogenic treatment can improve the wear resistance of steel and temper resistance. Cryogenic treatment not only for cold mold, can also be used for hot work die and carbide. Special quality steel is especially needed in the production process strictly control the quality and performance of steel MH51 suppliers, indicators of their quality control provisions in its standard belongs, in representation of the representatives of steel symbol indicates that as A , E, C, etc., foreign steel quality level is not marked, but marked refining methods used or made some improvement, improvement, as expressed by the ESR ESR; VAR G50; VIM vacuum induction furnace; mod represents for some improvements and the like. The greater the temperature difference between the inside and outside of the workpiece, and thus is easy to cause thermal stress in the heating process causes deformation. So heated pace of cross-sectional size of the work should also be considered: a large cross-section should be slower; on the contrary, a small section of the workpiece, the heating rate can be faster. In the construction steel market, although prices overall still continues to rise, but the increase has been a marked contraction. Shanghai, Jinan and other places t price week rose from 20 to 180 yuan, Tianjin, Shijiazhuang and other places have fell, t price decreases in the 20-70 yuan. Currently, the business confidence have turned cautious, market transactions are gradually shrinking. Yong Wei mold steel | MH51 Wholesales | Shantou MH51 provided by Yong Wei steel mold. Looking for "Die steel, DC53, SKD11.SUS440C, SUS420" reliable supplier, choose to have the entire network ShangMeng Certified: Dongguan City An Yongwei mold steel shop (www.dgyongwei.com), trustworthiness and reliability, now click on "Commercial Union Support" on page live chat with us now!