The main applications of normalizing are as follows:①For low carbon steel, astm a573 gr 70 equivalent carbon steel. The hardness of low carbon steel after normalizing is slightly higher than that after annealing, and the toughness is also better, so norma
The main applications of normalizing are as follows:①For low carbon steel, astm a573 gr 70 equivalent carbon steel. The hardness of low carbon steel after normalizing is slightly higher than that after annealing, and the toughness is also better, so normalizing can be used as the pretreatment of cutting.②For medium carbon steel, normalizing can be used as the final heat treatment instead of quenching and tempering treatment, or as the preparation treatment before surface quenching by induction heating.③Normalizing can be used in tool steel, bearing steel, carburizing steel and so on, which can eliminate or inhibit the formation of network carbide, thus obtaining the good microstructure needed for spheroidizing annealing.④Normalizing can refine the cast structure and improve the machinability of steel castings.
The strength indexes of astm a573 gr 70 equivalent carbon steel pipeline steel mainly include tensile strength and yield strength. At the same time, the yield strength ratio (yield strength to tensile strength ratio) of pipeline steel is also required, which is generally in the range of 0.85-0.93. Pipeline steel shall have enough high impact toughness (crack initiation and crack arrest toughness). For the base metal, when the toughness of the astm a573 gr 70 equivalent carbon steel material meets the requirements of crack arrest, its toughness generally can also meet the requirements of crack prevention.
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