我国通用的合金结构钢各牌号的主要用途（The main uses of various grades of alloy structural steels in China）.docVIP

我国通用的合金结构钢各牌号的主要用途（The main uses of various grades of alloy structural steels in China） (1) 20Mn2 Used to make parts with smaller cross sections (not more than 50mm in diameter), which can be used instead of 20Cr steel. Often used in the manufacture of carburized small gear, small shaft; not high piston pin, ten seed pin head, diesel engine sleeve, valve rod, etc.; can also be used as quenched and tempered steel, such as the manufacture of cold heading bolts. (2) 30Mn2 As an important section of small fasteners (quenched), usually can be used for automobile, tractor and parts manufacturing and general mechanical frame beam, transmission gear, shaft, and large heading bolt section; in the manufacture of mining machinery, can be used for carburizing parts manufacturing requirements of core strength is high, such as the rear axle of crane and journal etc.. (3) 35Mn2 It is used as connecting rod, mandrel, crankshaft, half axle, joystick, fan fittings, cold heading, various important bolts of diameter less than 15mm, and so on. In the manufacture of small sections (diameter less than 20mm) parts, can replace 40Cr steel. (4) 40Mn2 Used to manufacture parts under the condition of midday load, such as shafts, shafts, crankshafts, piston rods, worms, levers, levers, and connecting rods. Loaded bolts, screws, reinforcement rings, springs, etc., and other parts that need to be quenched and tempered. When making small section (diameter less than 40mm), it is close to 40Cr steel. (5) 45Mn2 Used to manufacture parts that work under high stress and wear conditions. The performance is comparable to that of 40Cr steel when the diameter is less than 60mm. As automobile, tractor and general machinery of the universal joint shaft, axle shaft, and the connecting rod cap, friction disc, worm, gear, gear oil, steam locomotive, carriage car and shaft, heavy duty rack, and cold drawn state of bolt and nut etc.. (6) 50Mn2 Used in the manufacture of high stress and strong wear under large par