Weathering steel plate quenching is a heat treatment that is stopped to improve the overall hardness. But there are many weather-resistant steel plates used to make mechanical parts that only require hard exteriors and soft interiors. The weathering steel plate has an operation method aiming at this effect, which is called surface hardening.
The surface hardening of weathering steel plates is as follows:
(1) High-frequency quenching: Put the weathering steel plate into the high-frequency coil and connect the high-frequency current. At this time, the induced current is generated in the workpiece. The high-frequency current is concentrated on the appearance of the weather-resistant steel plate, so as long as the exterior of the weather-resistant steel plate is heated. The method of heating and quenching in this way is called high frequency induction heating and quenching.
(2) Flame quenching: This is a quenching method that uses a flame such as oxygen to stop heating
(3) Carburizing and quenching: To achieve the purpose of only increasing the surface carbon content of the weathering steel plate, put the weathering steel plate into the carburizing agent to stop heating and carburizing and quenching. As carburizing agents, there are liquid carburizing agents such as solid carburizing agents such as charcoal and coke, and gas carburizing agents such as CO. When the heating is stopped in this carburizing agent, the carbon element penetrates into the outer surface of the weathering steel sheet, and only the outer surface of the weathering steel sheet becomes a high carbon weathering steel sheet. Carburized quenched layer can reach the depth in millimeters.
