Industry news

Common die steel

发布日期:2016-05-18    作者:    阅读次数:1412
1 - carbon tool steel carbon content is high, between the 0.65-1.35%. According to the organization belongs to hypoeutectic, eutectic or eutectoid steel. After heat treatment, the surface of carbon tool steel can get high hardness and wear resistance, and the center of the core has good toughness, low annealing hardness (no more than HB207), good processing performance. But its red hardness is poor, when the working temperature of 250 degrees Celsius, the hardness and wear resistance of the steel sharp decline, the hardness decreased to HRC60 below, this kind of steel is low. The larger tool can not be quenched (water quenching diameter is 15mm), the hardness of the surface hardened layer and the center of the water quenched. The tool is easy to deform when quenching. Or the formation of a crack in addition, the quenching temperature range is narrow, the temperature should be strictly controlled in the quenching. To prevent overheating, decarburization and deformation.
Alloy tool steel tool steel alloy
Addition of Si, Mn, Ni, Cr, W, Mo, V, and other alloy elements in carbon tool steel.
The addition of Cr and Mn can improve the quenching performance of tool steel, which can be selected to join or add other elements in the same time according to the requirements, or to form a series of alloy tool steel, which is generally not more than 5%.
Classification by use
2 - alloy tool steel quenching hardening, penetration resistance, abrasion resistance and toughness are better than that of carbon tool steel high, according to use can be broadly for cutting tools, tools and gauges used steel 3 class. Which high carbon content steel (carbon mass fraction greater than 0.80%) used for manufacturing cutting tools, measuring tools and cold working die, this kind of steel after quenching hardness HRC60, and has sufficient wear resistance; medium carbon steel (mass fraction of carbon 0.35%~0.70%) for the manufacture of hot work die, this kind of steel after quenching hardness is slightly lower, HRC50~55, but toughness good.
3- high speed tool steel is mainly used in the manufacture of high efficiency cutting tool. Because of its high hardness, high wear resistance, high strength characteristics, it is also used in the manufacture of high performance requirements of the mold, roller, high temperature bearings and high temperature springs, etc.. After heat treatment, the hardness of high speed tool steel can reach more than HRC63, and it can keep high hardness at the working temperature of about 600 degrees C, and its toughness, wear resistance and heat resistance are better. The main alloying elements of high speed tool steel are many, molybdenum, chromium, vanadium, and some high speed tool steel, such as cobalt, aluminum and so on. This kind of steel belongs to high carbon high alloy ledeburite steel, one of the main characteristics of organization is to contain large amounts of carbides.
4- powder high speed tool steel is produced by powder metallurgy method. First by atomization method from hypoxia high-speed tool steel pre alloyed powder, and then use cold and hot static press powder compaction fulfill dense billet, by forging and rolling yield. Powder high-speed tool steel of fine carbides, uniform distribution, toughness, grinding resistance and dimensional stability are very good, can be used in the production of casting method may produce more high content of alloy elements superhard high speed tool steel.
Powder high speed tool steel can be divided into 3 categories, the first category is the high speed tool steel, which is characterized by the hardness of the hard alloy, but also has good workability, machinability, abrasive and strong toughness. The second category is no cobalt high tungsten, molybdenum, vanadium super hard high speed tool steel. The third category is super wear-resistant high speed tool steel. Its hardness is not too high, but the wear resistance is excellent, mainly used for the requirements of high wear resistance and withstand the impact load of the working conditions. Powder high speed steel can be more than 64 degrees Celsius, so the wear resistance of high speed steel powder is better than high speed steel, so the powder high speed steel better toughness.
According to the engineers, powder metallurgy high speed steel made with the traditional high-speed steel in that program on the differences of manufacturing, and adds some problems of metal elements, may depend on the demand smelting out elements of various components of steel material. In general, the same as the traditional high-speed steel is divided into Mo (MO) and W (tungsten) system two large series. The material toughness of Mo system is better than that of W system. The material has better wear resistance, high temperature hardness and impact resistance.
C12MoV (alloy tool steel): hardness: HRC60.
D2 steel (alloy tool steel): it is a high wear resistant micro deformation cold working die steel, which belongs to the wind hard tool steel. The mass fraction of the carbon is as high as 1.5%, the chromium content is as high as 11.5%, after heat treatment, the hardness can reach 60HRC, but the relative ductility, toughness and rust resistance are weak. With the development of high precision, high efficiency and many kinds of cold stamping products, the die steel has better wear resistance and toughness. Compared with Cr12MoV steel, the chemical composition of the steel increased by Mo, V, changed the steel casting structure, improved the structure of the vegetable's body, strong toughness and wear resistance is better than Cr12MoV steel, improve the service life of the mold. Because the yield point of the steel and plastic deformation resistance of Cr12MoV steel is higher than that of the Cr12MoV steel, its forging performance and thermoplastic forming properties are slightly worse than that of the steel. The content of V and Mo in D2 steel is higher than that of Cr12MoV steel, which has better comprehensive performance, and the traditional Cr12MoV steel will be replaced gradually.
SKD-11, alloy tool steel characteristics: 1, high temperature strength and good toughness, better wear resistance, easy cutting; 2, SKD11 is a very good strength, toughness and heat balance of cold die steel, in recent years with the isotropic product development increasingly to the development of high tenacity, it can make a longer life of the mold, more stable performance, and easy processing, heat treatment deformation is small.
DC53 (alloy tool steel) characteristics: (1) cutting, grinding is good. By cutting, grinding is better than the SKD11, so the long life of the processing tool, the number of working hours than the province.