Common defects in trolley furnace heat treatment process operations (quenching and tempering): overheating and overheating The causes of the defects are as follows:
1. Quenching temperature is too high
2. The temperature control instrument malfunctions, or the indication value is not accurate
3. The parts are too close to or close to the resistance wire of the trolley heater
4. There are too many deposits on the bottom of the furnace, and the electrodes are inserted into it, so that the temperature of the bottom of the furnace is too high, and the parts are too hot and overheated in the sediment.
5. Decarburization or carbonization of parts during heating
6. Parts are heated too long in the trolley furnace
7. Trolley furnace electrode distribution is unreasonable, the furnace temperature is not uniform to cause local overheating
8. Strict quenching temperature control measures to prevent this defect:
1. Correct control of quenching heating temperature and holding time
2. Quenching fixture design should be reasonable
3. Proofreading temperature control instruments
4. Checking the microstructure after quenching
5. Workpieces must be powered off
6. To prevent dissimilar steels from mixing in this defect:
1. Burned parts are generally scrapped
2. Those who are not overheated may be annealed and quenched and tempered.
Original article copyright belongs to Danyang Jiaheng Furnace Co., Ltd., please indicate the source
1. Quenching temperature is too high
2. The temperature control instrument malfunctions, or the indication value is not accurate
3. The parts are too close to or close to the resistance wire of the trolley heater
4. There are too many deposits on the bottom of the furnace, and the electrodes are inserted into it, so that the temperature of the bottom of the furnace is too high, and the parts are too hot and overheated in the sediment.
5. Decarburization or carbonization of parts during heating
6. Parts are heated too long in the trolley furnace
7. Trolley furnace electrode distribution is unreasonable, the furnace temperature is not uniform to cause local overheating
8. Strict quenching temperature control measures to prevent this defect:
1. Correct control of quenching heating temperature and holding time
2. Quenching fixture design should be reasonable
3. Proofreading temperature control instruments
4. Checking the microstructure after quenching
5. Workpieces must be powered off
6. To prevent dissimilar steels from mixing in this defect:
1. Burned parts are generally scrapped
2. Those who are not overheated may be annealed and quenched and tempered.
Original article copyright belongs to Danyang Jiaheng Furnace Co., Ltd., please indicate the source
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