The heat-resistant cast steel lining plate (ZG35Cr24Ni7SiN) is easy to crack, melt or even fracture during use, and has a short service life. The service life of the door sub plate of the square coke tank and the lining plate of the next layer is only about 2 months, and the service life of the door sub plate and lower inclined plate of the round coke tank is about 4-6 months. Under the impact wear of high-temperature coke, the deformation and crack of the middle and lower lining plate of coke tank are more serious.
The above defects are the result of the combined action of various reasons. The internal chemical composition factors of the lining plate, the micro metallographic structure of the lining plate, the internal and external defects of the lining plate, the structure of the lining plate itself, the accidental situation of on-site use, etc. may affect the service performance of the lining plate. The causes of the defects are mainly analyzed from the aspects of chemical composition, micro metallographic structure, casting defects and lining plate structure, and some improvement measures are put forward, In order to better improve the service performance and service life of the lining plate.