Causes and preventive measures of quenching crack of WTSt 52-3 weathering steel plate

Appearance effect: the key is caused by the design elements of WTSt 52-3 weathering steel plate, such as too small arc R, poor setting of main bone, poor connection of cross section.

Overtemperature: the key is caused by temperature control prohibition or runaway, too high set temperature of WTSt 52-3 weathering steel plate processing technology, uneven temperature control and other factors. The preventive measures include maintenance, review of temperature control system software, adjustment of processing temperature, high-speed rail between steel parts and furnace bottom pipe, etc.

Carburizing of WTSt 52-3 weathering steel plate: the key factors are over temperature / coarse grain, no maintenance heating of gas furnace, small mechanical capacity, calcination or preparation for quenching and tempering treatment of residual decarburized layer, etc. the preventive measures are controllable atmosphere heating, salt bath heating, loading maintenance or application of oxidized architectural coating for vacuum sintering furnace and box furnace; the machine feed rate increases by 2 ~ 4mm.

Poor refrigeration: the key is caused by poor selection of coolant or low temperature, so we should grasp the refrigeration characteristics of heat treatment material of WTSt 52-3 weathering steel plate or solve the problem of quenching.

Quality of WTSt 52-3 weathering steel plate: for example, serious shrinkage porosity of martensite, poor forging quality and poor preparation heat treatment process, the preventive measures are to select appropriate casting process and effective rules and regulations for preparation quenching and tempering treatment.