The advantages of using Q235A (A3 steel) for large machinery processing
The main advantage of large mechanical processing in the operation of a certain degree will have high plasticity, toughness and welding properties, the whole product has a certain stamping performance and cold bending performance, in the use of mainly for the requirements of mechanical parts and welded structural parts, such as its tie rods, connecting rods, pins, shafts, screws, nuts, brackets, bases, etc..
The advantages of using 40Cr for large machining
Large-scale machining in a certain degree after the tempering process will have very good overall mechanical properties and low temperature impact toughness and low notch sensitivity, good hardenability. Oil cooling can be obtained when the higher strength, water-cooled parts are prone to cracking. Good machinability after tempering or quenching, but bad weldability, easy to produce cracks.
In the use of models mainly after tempering treatment for its manufacturing process of its fast moving mechanical parts, such as its machine tool gears, shafts, worm gears, etc.. After quenching and high frequency surface quenching is used in the manufacture of parts with high surface hardness and wear resistance, such as gears, shafts, spindles, crankshafts, mandrels, sleeves, pins, connecting rods, etc.
After quenching and medium-temperature tempering for the manufacture of heavy-duty, medium-speed mechanical parts, such as oil pump rotors, sliders, gears, spindles, etc. After quenching and low-temperature tempering for the manufacture of heavy-duty, low-impact, wear-resistant mechanical parts, such as worm shafts, spindles, shafts, etc. Carbonitriding process that is after the manufacture of larger size, low-temperature impact toughness of the transmission parts, such as shafts, gears, etc.
The advantages of using 45# for large machinery processing
45# is a high-quality carbon structural steel, is currently the most commonly used medium carbon tempered steel.
In the process of operation will have very good overall mechanical properties, in the use of its low hardenability, water quenching is easy to produce cracks, welded parts need to be preheated before welding, after welding need to be annealed.
Mainly used for: the manufacture of high-strength mechanical moving parts, such as impellers, pistons, shafts, gears, racks, worm gears, etc.