Plastic mold steel work, in the long-term effect of cyclic stress often leads to fatigue fracture. In the form of small energy repeated impact fatigue fracture, fatigue fracture contact fatigue fracture tensile and bending fatigue fracture. Heat at a high temperature work die, required to maintain its organization and stability, thereby maintaining a sufficiently high hardness, this performance is called red hardness. Carbon tool steels, low alloy tool steel is usually able to maintain this performance in the temperature range 180 ~ 250 ℃, the chromium-molybdenum steel hot die generally within a temperature range of 550 ~ 600 ℃ to maintain this performance. Red hardness of steel depends on the chemical composition and heat treatment of steel. Studies show that high-carbon and low-alloy tool steel and high-carbon steel can be carried out in carburizing or carbonitriding. Low-carbon steel carburizing or carbonitriding, should choose a lower heating temperature and shorter holding time as possible, then you can ensure that there is more surface core undissolved carbides, carburizing and carbonitriding After penetration, surface granular carbide, carbide, there was a marked increase in the total volume can increase wear resistance of steel. Some plastic materials have acid resistance, and some by the addition of a reinforcing agent, or other modifications, such as glass fibers the major damage to the mold, are to be considered during the selection. There is a strong corrosive plastic general election S136,2316,420 a class steel, in addition to the election S136,2316,420 weak corrosive, there SKD61, NAK80, PAK90,718M. Strongly acidic plastic material has: PVC, POM, PBT plastic material has a weak acid: PC, PP, PMMA, PA, single medium quench hardening is the most common method of high speed steel powder, simple operation, equipment, and environmental requirements low. Inadequate water quenching is easily deformed steel, alloy steel water quenching easy to crack. The method of operation is the end of the holding time of a workpiece into the quenching medium to the cooling capacity of the quenching cooling medium, the cooling conditions in this process depends entirely on the cooling characteristics of the workpiece using the medium. Mills use superior resources DEX40 powder high speed steel, high speed steel powder weaknesses S590, the stainless steel products do fine well, despite the current market lower, but many businesses is not overly worried, because excellent product quality, and the current Quotes even approaching low, as long as they endure, to seize the opportunity to make the anti-hunters also a high probability event. National Day, the iron ore spot market transactions are extremely active in cargo turnover is also continuous heavy volume, Dalian iron ore futures even once the daily limit to close at Platts, the highest index also rose $ 83.75 / ton, the highest in nearly a month highs market sentiment continued to pick up. But DEX20 powder high speed steel, iron ore prices really have bottomed out? In fact, this is also related to the late steel to determine the trend, following the author of the latest changes in the market, as we do a brief analysis. Look forward to all of us to grasp the current market situation changes help. S390 powder high speed steel | Liuzhou powder high speed steel | AsiaVest 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!