The three materials 35Mn, 40Mn, and 45Mn are all high-quality carbon structural steels. The main difference is that the carbon content is different, and the other components are the same. The difference in carbon content is directly related to material properties.
The plasticity of 35Mn steel during cold deformation is medium and the machinability is good, but the weldability is poor. It should be used after quenching and tempering. It is suitable for shafts, bolts, nuts, screws, spindles, gears, and bolts, nuts, levers, etc. in medium-sized machinery.
45Mn carbon structural steel can obtain better comprehensive mechanical properties after quenching and tempering. The cutting performance is still good, but the welding performance is poor, the cold deformation plasticity is low, and there is a tendency to temper brittleness. It is generally used in the quenched and tempered state, and can also be used in Used in quenched and tempered or normalized state.
50Mn steel has high strength, elasticity and hardness. It is mostly used after quenching and tempering, and its welding performance is poor. The performance is similar to 50#, but its hardenability is higher, and the strength, hardness and elasticity after heat treatment are slightly higher than that of 50# steel. The weldability is poor, and it has a tendency to overheat sensitivity and temper brittleness. 50Mn steel is used as stress-bearing parts, high-wear parts, high-stress parts. After high frequency quenching, train shafts, worms, connecting rods and automobile crankshafts, such as gears, gear shafts, friction discs, spindles, flat springs, etc., can also be manufactured.
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