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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Characteristics and varieties analysis of quenched and tempered steel Analysis of characteristics and varieties of quenched and tempered steel
The carbon content in quenched and tempered steel is usually O. 35% to 0.55% (carbon steel); or O. 25%~0.50% (alloy steel); if the carbon content is too high, the strength is high, the tolerance, the plasticity is low, and the carbon content is low; the resistance, the plasticity are good, the strength is lacking, and the carbon content is medium; Can be co-ordinated with appropriate strength, durability and plasticity. The primary role of alloying elements in quenched and tempered steel is to improve hardenability and inductive mechanical properties; thus alloying elements can improve the mechanical properties of steel in quenched and tempered state; For carbon steel; alloy steel with the same carbon content has high strength, high plasticity and high resistance; therefore, it is often used as an important quenching and tempering part. Quenched and tempered steel according to hardenability; can be divided into low hardenability steel, Medium hardenability steel and high hardenability steel; the following analysis is as follows. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
(1) Low hardenability steel The critical diameter of oil quenching of this type of steel does not exceed 30mm; commonly used carbon steel, chrome steel, manganese steel and boron steel. Common trademarks are 45, 40Mn2, 45Mn2, 42Mn2V, 35SiMn, 40B , 40MnB, 40MnVB, 40Cr, 40CrSi, 40CrV, 50 (r, rV, etc.; low carbon hardenability; poor mechanical properties; usually used to make small and unimportant parts, chrome steel has good hardenability It has higher tempering stability than carbon steel; it has wide quenching temperature, is not easy to overheat, and has a tendency to deform and crack. Depending on the value of the 檬 檬 è°ˆ è°ˆ è°ˆ è°ˆ è°ˆ è°ˆ å—¨ å—¨ å—¨ å—¨ å—¨ å—¨ å—¨ å—¨ å—¨ å—¨ å—¨ å—¨ å—¨ å—¨ å—¨èŸ è ¹è·£.å²£ çƒ çƒ å€¼ æ…· æ…· æ…· æ…· 陀 陀 龋鸶 龋鸶 æ…· æ…· æ…· 龋鸶 龋鸶 龋鸶 龋鸶 çƒ çƒ çƒ çƒ çƒ çƒ å’ å’ å’ å’ å’ å’ å’ å’ å’ å’ å’ å’ Cr Cr Cr ; ; ; ; ; ; ; ; ; ; ; ; Key axis, etc.
(2) Medium hardenability steel The oil quenching of this type of steel is directly in the range of 40-60 n; m; the commonly used steel grades are chrome-molybdenum steel, chrome-manganese steel, etc. The common trademark is 35 (jrMn, 42CrMo, 35L: rMnV, 40CrMn , 35CrMnSi, 30CrMnsi, 35 (: rMnTi, 40crMnTi, 40crNi, etc.; chrome-molybdenum steel has high hardenability; high temperature strength and arrangement stability; eliminate temper brittleness; 42CrMo is used to manufacture high strength requirements, cross section Large quenched and tempered parts; such as gears, turbine generator main shafts, heavy-duty connecting rods, etc.; together with parts that can be operated for a long time below 5 (:) ° ° C, hardenability of chrome-manganese steel and High strength; no decline in resistance; 30 (: rMnsi is high-strength steel; has good weldability; used for manufacturing high-pressure blower shrinkage pieces, high-speed load grinding wheel shaft and other important parts.
(3) High hardenability steel The critical diameter of the oil of this type of steel is 60 ~ 100 mm. Common information trademarks are 30Mn2MoW, 40CrMnMo, 30(:rNi3, 37CrNi3, 40CrNiMc), 45CrNiMov, 25cr2Ni4w, etc.; 40crMnMo is a commonly used high-hardenability steel; it has the characteristics of small temper brittleness and small tendency to overheat; Large-area, high-strength and high-resistance parts; such as the semi-axle of large heavy-duty vehicles.
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Analysis of characteristics and varieties of quenched and tempered steel
Source: China Bearing Network Time: 2017-11-03