Reasons and preventive measures of ASTM A588 GrA steel plate quenching crack

1. Appearance and effectiveness: The key is caused by the elements of the ASTM A588 GrA steel plate design plan, such as the arc R is too small, the main bone part is not properly set, and the cross-section is not well connected.

2. Overtemperature: The key is caused by the prohibition of temperature control or running temperature, the set temperature of ASTM A588 GrA steel plate processing technology is too high, and the temperature control is uneven. Preventive measures include maintenance, review of temperature control system software, and adjustment of processing temperature , Put high-speed iron between ASTM A588 GrA steel plate and furnace bottom tube.

3. Carburizing: The key is caused by factors such as over-temperature/coarse crystals, no-maintenance heating of the gas furnace, small machine capacity, ASTM A588 GrA steel plate forging or preparation of quenching and tempering treatment residual decarburization layer, etc. The preventive measures are controlled atmosphere Heating, salt bath heating, vacuum sintering furnace, box furnace selection for loading maintenance or application of oxidized architectural coating; machine feed rate increased by 2~4mm.

4. Poor refrigeration: The key is the poor selection of coolant or low temperature. It should be understood that the refrigeration characteristics of ASTM A588 GrA steel plate heat treatment materials or quenching solutions.

5. ASTM A588 GrA steel plate structure is not good: if the martensite shrinkage is relatively serious, the forging quality is poor, the preparation heat treatment process is not good, etc., the preventive measures are to select the appropriate ASTM A588 GrA steel plate casting process and effective preparation and quenching treatment regulations.