What is the difference between Q235 steel and Q345 steel? First, strength difference: the lower limit of yield strength of Q235 steel is 235MPA, and the lower limit of yield strength of Q345 steel is 345MPA (Q means "Qu" in Chinese characters, and the later value represents the lower limit of yield strength). Second, the chemical difference: the alloy content of Q235 steel and Q345 steel is different, Q235 steel is ordinary carbon steel, while Q345 steel is low alloy steel EN 10025 S420ML steel supplier.
Compared with carbon steel, alloy steel has higher strength, better heat resistance, better low temperature resistance, better corrosion resistance and other advantages. Some of its work environment can not be adapted by carbon steel. Therefore, alloy steel is a common and important material in pressure pipeline. Low alloy steel, EN 10025 S420ML steel supplier quenched and tempered steel, stainless steel, heat-resistant steel and low temperature steel are commonly used in pressure pipes.
Quenching is a heat treatment process in which steel parts are heated to above the critical temperature, and after proper heat preservation, the parts are quickly cooled to room temperature in water or oil, so that martensite transformation occurs. The hardness of the quenched EN 10025 S420ML steel supplier increases sharply. Quenching is to prepare the organization for adjusting and improving the performance of EN 10025 S420ML steel supplier during tempering, while tempering determines the performance and life of the workpiece.
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