One of the most widely used steel grades for precision machining of 40Cr

Precision machining is still very important in the current work, and it is also very high in terms of development technology. Nowadays, precision machining is still very large because of the daily quantity, and now many precision machining manufacturers are doing comparisons in this regard. Okay, that's why precision machining technology is still so popular nowadays.
Moreover, the performance of precision machining is very stable now, and there is a very complete range of types, and from the perspective of these years, the current precision machining technology is still very ambitious, why do you say that?
Main features: After quenching and tempering, it has good comprehensive mechanical properties, low-temperature impact toughness and low notch sensitivity, good hardenability, high fatigue strength when oil-cooled, and complex shapes when water-cooled The parts are prone to cracks, cold-formed plasticity is medium, good machinability after tempering or quenching and tempering, but the weldability is not good, and cracks are easy to occur. It should be preheated to 100～150℃ before welding, and it is generally used in quenched and tempered state. , Can also carry out carbonitriding and high frequency surface quenching treatment.
Application example: After quenching and tempering, it is used to manufacture medium-speed and medium-load parts, such as machine tool gears, shafts, worms, spline shafts, thimble sleeves, etc., after quenching and tempering, high-frequency surface quenching is used to manufacture high-surface Hard and wear-resistant parts, such as gears, shafts, spindles, crankshafts, spindles, sleeves, pins, connecting rods, screws and nuts, intake valves, etc., are used to manufacture heavy-duty, medium-duty Quick-impact parts, such as oil pump rotors, sliders, gears, main shafts, collars, etc., are used to manufacture heavy-duty, low-impact, and wear-resistant parts after quenching and low-temperature tempering, such as worms, spindles, shafts, and collars Etc., the transmission parts with larger size and higher low-temperature impact toughness, such as shafts, gears, etc., will be manufactured at the carbonitriding site.