We all know TIMKEN bearings are made of steel, my friend told me TIMKEN bearings generally bearing steel manufacturing, steel is not there are many types of it? Yes, indeed, many types of steel! Here to introduce the knowledge of the steel. Quenched and tempered steel carbon content of 0.35% to 0.55% (carbon steel), or 0.25% to 0.50% (alloy steel), high carbon content, higher strength and toughness , plastic low; low carbon content, the toughness, plastic preferably insufficient strength; medium carbon content, may both have the appropriate strength, toughness and plasticity. The major role of quenched and tempered steel alloy elements is to increase hardenability and mechanical properties, alloying elements to improve the mechanical properties of the steel in the quenched and tempered condition, relative to carbon steel, alloy steel of the same carbon content high strength, high ductility and toughness, they are used as important quenched and tempered parts. Quenched and tempered steel according to the level of hardenability, can be divided into low hardenability steel hardenability steel and high hardenability steel, the following were introduced as follows.
(1) low hardenability steel
Class steel oil quenched critical diameter not exceeding 30mm, carbon steel, chrome steel, manganese steel and boron steel. Common grades 45,40 Mn2 45Mn2, 42Mn2V 35SiMn, 40B, 40MnB, 40MnVB, 40Cr, 40CrSi, 40CrV, 50 (r, rV such as low carbon steel hardenability, mechanical properties, generally used to make a small cross-section, and unimportant parts; chrome steel with good hardenability, temper resistance than carbon steel, quenching temperature width, not overheating, deformation cracking tendency, so the application is very broad; role of manganese steel and chrome steel similar, manganese so that the critical cooling rate of the steel is greatly reduced, improving the strength and hardness of the steel; the boron steel boron significantly improves the hardenability of the steel, its performance is close to the critical diameter of 40Cr, oil quenching at 20 ~~ 30mm, commonly used for automobile axle, worm, spline shaft.
(2) in hardenability steel
Class steel oil quenched directly in the 40 ~ 60n, m, commonly used types of steel and chromium-molybdenum steel, chromium, manganese steel, etc.. Common grade 35 (jrMn, 42CrMo, 35L: rMnV, 40CrMn, 35CrMnSi, 30CrMnsi, 35 (: rMnTi, 40crMnTi, 40crNi such as chromium molybdenum steel with high hardenability, high-temperature, high strength and good organizational stability, eliminating back fire brittleness, 42CrMo used to manufacture high strength requirements section of quenched and tempered parts, such as gears, turbine generator shaft by heavy stress rod, but also can be manufactured below 5 (:) o ℃ part of long-term work; chromium-manganese steel hardenability and strength, toughness did not reduce the 30 (: rMnsi for high strength steel with good weldability, used in the manufacture of high-pressure blower compression chip, high-speed load grinding wheel axis and other important parts.
(3) high hardenability steel
Class steel oil-cooled critical diameter of 60 ~ 100 mm. Common material grades 30Mn2MoW 40CrMnMo, 30 (: rNi3, 37CrNi3, 40CrNiMc), 45CrNiMov, 25cr2Ni4w etc., 40crMnMo high hardenability steel, with small temper brittleness, overheating tendencies and other small features, used to make the cut large parts of high strength and high toughness, such as the large heavy vehicles Axle.
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