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OCT 25 2012

Tool steel

Manganese steel

The high-speed tool steel is mainly used to manufacture a high efficiency of the cutting tool. Because of its high red hardness, wear resistance, high strength characteristics, is also used in the manufacture of high-performance requirements of the mold, roll, high temperature bearings and high-temperature spring. After the heat treatment of the high speed tool steel by using a hardness of up to HRC63 or more, a high hardness, but still maintain the working temperature of 600 ° C or about its toughness, wear resistance and heat resistance were better. How annealed state the main alloying elements of high-speed tool steel, the elements such as cobalt, aluminum, molybdenum, chromium, vanadium, as well as some high-speed tool steel was added. Such steel is a high carbon and high alloy ledeburite, one of the main organizing feature contains a large number of carbide. Carbide is cast in the high-speed tool steel, eutectic carbides, after processing by the thermal pressure crushed into granular distribution in the steel, known as the primary carbides; carbide precipitated from the austenitic and martensitic matrix, secondary carbides. These carbides a great influence on the performance of high-speed tool steel, especially secondary carbides have a great impact on the steel Albright of the grain size and secondary hardening performance. Carbides number, type, and the chemical composition of the steel, while the particle size and distribution of the carbides with the amount of deformation of steel. Tungsten, molybdenum high speed tool steel alloying elements play an important role in the secondary hardening of steel and other performance. Chromium quenching of steel permeability, oxidation resistance and abrasion resistance plays an important role in certain secondary hardening. Vanadium plays an important role in the secondary hardening and wear resistance of steel but reduce available grinding performance.
The quenching temperature of the high-speed tool steel is very high, close to the melting point, its purpose is dissolved in the matrix of the alloy carbides more, so that the steel has a better ability to secondary hardening. High-speed tool steel, the hardness after quenching increases, this is first hardened, but the higher the quenching temperature, the lower the strength and toughness after tempering. Low temperature below 350 ℃ after quenching and tempering hardness decline in temperatures above 350 ℃ tempering hardness gradually improve, to the range of 520 ~ 580 ℃ tempering (chemical composition, tempering temperature) appear second hardness peak, and more than quenched hardness, this secondary hardening. This is an important characteristic of the high-speed tool steel.
In addition to the use of performance with high hardness, wear resistance, red hardness, high-speed tool steel thermoplastic, can grinding process performance.
Mostly the high-speed tool steel alloying elements tungsten, molybdenum-free or with a small amount of molybdenum. Its main characteristic is overheating sensitivity decarburization sensitivity over a wide temperature range of heat treatment and thermal processing, but coarse carbide particles, poor distribution uniformity, the impact toughness of steel and plastic.
Tungsten molybdenum high speed tool steel alloying elements tungsten and molybdenum. Its main feature is the degree and distribution of carbide particles are better than tungsten high-speed tool steel, decarburization sensitivity and thermal sensitivity below molybdenum high speed tool steel, and technological properties are good.
Molybdenum high speed tool steel alloying elements molybdenum, does not contain tungsten or with small amounts of tungsten. Its main feature is the fine carbide particles uniformly distributed, toughness is good, but the decarbonization sensitivity and thermal sensitivity, thermal processing and heat treatment range is narrow.
Containing drilling high-speed tool steel added a certain amount of cobalt on the basis of the general-purpose high-speed tool steel, can significantly increase the hardness, wear resistance and toughness of the steel.
Powder high-speed tool steel produced by powder metallurgy method. First take the low-oxygen high-speed tool steel prealloyed powder atomization method, and then washed with cold, hot isostatic presses the powder compaction sake dense billet, and then by forging, rolling timber. The small carbide powder high-speed tool steel, evenly distributed, toughness, grinding resistance and dimensional stability are good, can produce ingot a superhard high-speed tool steel may have a higher content of alloying elements. Powder high-speed tool steel can be divided into three categories, the first category cobalt high-speed tool steel, which is characterized by close to the hardness of the carbide, but also has good malleability, machinability, grindability and toughness . The second category is high cobalt, tungsten, molybdenum, vanadium superhard high-speed tool steel. The third category is the super wear-resistant high-speed tool steel. Its hardness is not too high, but the abrasion resistance is excellent, and is mainly used for working conditions requiring high wear and to withstand the impact load.