40cr steel pipe and 42CrMo steel pipe which is better
40cr is a round steel with a hollow section and no joints around it. The 40Cr steel tube is made by punching a solid tube into a capillary tube and then hot rolled, cold rolled or cold drawn. 40cr steel pipe has a hollow section, compared with solid steel such as round steel and other solid steel, when the same bending and torsional strength, lighter weight, is an economical steel section.
42CrMo steel pipe is an ultra-high strength steel, with high strength and toughness, hardenability is also good, no obvious temper brittleness, quenching and tempering after a higher fatigue limit and resistance to multiple impact, low temperature impact toughness. The steel is suitable for manufacturing large and medium-sized plastic molds that require a certain strength and toughness. Its corresponding international standard organization number: 42CrMo4 corresponding to Japan brand: SCM440 corresponding to German brand: 42CrMo4 approximately corresponds to the United States brand: 4140 characteristics and scope of application: strength, high hardenability, good toughness, small deformation when quenching, high temperature creep Variable strength and durability. It is used to make forgings that require higher strength and greater tempering section than 35CrMo steel, such as large gears for locomotive towing, supercharger transmission gears, rear axles, highly loaded connecting rods, and spring clips. Below 2000m deep oil drill pipe joints and fishing tools, and can be used for bending machine molds.
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