Cavity surface of the metal thermal fatigue (cracking). Hot mold work is characterized by intermittent. Each time the thermal state of the metal to be formed after the water cooling of the mold cavity surface of oil, air and other media. As such. Hot mold working condition is repeated heating and cooling, so that the surface of the metal mold cavity to produce repeated thermal expansion and contraction, which repeatedly subjected to tensile and compressive stress. As a result, the cavity surface cracks caused by M42, M42 rod called thermal fatigue phenomenon, whereby hot die steel is proposed for the second basic performance requirements. That has a high thermal fatigue resistance. Diameter size shoddy steel fluctuations due; L, steel surface temperature instability yin and yang. 2, the composition of the steel uniform. 3, due to poor equipment, low ground strength, source: mold technology mill Colloction big bounce. There will be changes in the larger inner diameter of the same week, so easy to produce steel discontinuity fracture. Heat treatment of high-energy beam source usually refers to the laser, electron beam, ion beam, etc., their common features are: feed material surface power density of at least 103W / cm2, their common features are: fast heating, heating area can be selected, deformation of the workpiece is small, does not require a cooling medium, the processing environment clean, controllable, inexpensive to implement automated processing. Heat treatment of high-energy beam principle, process etc invested abroad more research, and improve die life in terms of access to applications. China at this stage is still in the demographic dividend period, there is a lot of labor, lower labor costs relative to developed countries; markets M42 material, the mold industry, the Ministry of steady advances in traditional markets and actively open up emerging markets, and even past the edge of the market to be ignored been developed, which are for the mold industry to develop a broad market space; In recent years, the Chinese government has issued a series of policies to support the casting, the development of domestic metal casting industry, but also to create a good development space for the mold industry. Shoddy die steel prone to folding. Folding is formed on the surface of a variety of die steel fold, this defect often throughout the product's portrait. The reason is due to shoddy manufacturers of folding the pursuit of high efficiency, reduction is too large, resulting in the ears, it creates a rolling when folded down, the product will crack when folded bend, making the strength of the mold steel declined significantly. October is the best month of the domestic infrastructure construction, but also the only good outdoor construction during the year "days"; in infrastructure in order to complete the annual task of pressure, I think, this time next month or so, is the outdoor infrastructure Project construction season, at rush period, driven M42 steel, construction steel demand should Xianluo etc. There is also a more centralized point of release. The September manufacturing PMI index is relatively stable, indicating that the domestic economy is stable, but lower portion of the index also reflects the economic side there is still downward pressure in the future. At the same time, good bad macro intertwined; relax or stimulate the property market, real estate credit market confidence, but it is difficult to form a clear effect in the short term. Yong Wei mold steel, M42 rod, Dazu M42 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!