The same steel material can have different mechanical properties (strength, hardness, plasticity and toughness), and different steel materials can also have similar mechanical properties, which are closely related to the heat treatment of steel.
Steel pipes through heat treatment to obtain a certain organization, in order to achieve the required performance. Heat treatment is the means, the use of performance is the purpose, and the structure of the steel is the basis and guarantee of performance.
45 steel pipe annealing is to heat the steel to 30-50 ° C above Ac3, and cool it with the furnace after heat preservation. Due to the relatively slow cooling rate, the microstructure is close to the equilibrium state, and the pearlite accounts for about 55% of the entire field of view.
45 steel normalizing is the steel heated to Ac3 above 30-50℃, after heat preservation in the air natural cooling, it is the main difference with complete annealing is that the cooling speed is faster, the degree of supercooling is large, so the pearlite layer is obviously finer than the annealing, the pearlite volume is significantly increased, the grain is relatively small, so the normalizing hardness is higher than the annealing.
45 steel pipe after normalizing can improve the casting or forging of the organization, fine austenite grains, the formation of fine and uniform ferrite and pearlite, thereby improving the strength, hardness and toughness of steel.
45 steel has a high strength and good plasticity, can be used to manufacture a variety of important parts, such as compressors, various chemical pumps and moving parts (crankshaft, connecting rod, piston rod), can also manufacture turbine impeller. Usually large size parts are used in the normalizing state, and small size parts can be adjusted into tempered sorbite.
45 steel is also the most commonly used tempered steel, which must be normalized before quenching and high temperature tempering to obtain a uniform and fine texture.
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