The alloying elements of low alloy steel are less than 5%. The low alloy steel is added one or several alloy elements on the basis of carbon steel to improve the performance. Such as manganese, silicon, aluminum, nickel, copper, boron, phosphorus, rare earth, etc. ASTM A514 quenched and tempered steel Steel with one or more of these elements will have the advantages of high strength and toughness. Due to the addition of few alloy elements, it is called low alloy high strength steel.
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Normalizing is to heat the steel parts to 30~80℃above the critical temperature for a period of time. Then the parts are taken out of the furnace and cooled in air. Since the cooling rate of normalizing is faster than that of annealing, the strength and hardness of normalized ASTM A514 quenched and tempered steel are higher than that of annealed ASTM A514 quenched and tempered steel, but the elimination of internal stress is not as good as annealing. The normalizing operation of ASTM A514 quenched and tempered steel is simple, the cost is low, the productivity is high, and it is widely used in actual production.
Mg element can reduce the number, size, distribution and morphology of inclusions in steel such as ASTM A514 quenched and tempered steel. Micro Mg can improve the size and distribution of carbides in bearing steel. And the carbide particles of bearing steel containing magnesium are fine and uniform. When Mg content is 0.002% - 0.003%, the tensile strength and yield strength of the steel increase by more than 5%, and the plasticity remains basically unchanged.
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