The mold copper tube is the heart of the continuous casting machine. Its quality directly determines the quality of the cast billet and the amount of steel pa

The mold copper tube is the heart of the continuous casting machine. Its quality directly determines the quality of the cast billet and the amount of steel passed. The service life of the mold copper tube depends on the equipment process and management level of the steel plant, and also depends on the mold The material of the copper tube and the manufacturing level of the copper tube.

At present, phosphorous deoxidized copper and silver copper are widely used to make mold copper tubes in China. Chromium-zirconium copper has not been widely used because of its high cost. This material has high strength and hardness, good electrical and thermal conductivity, and its mechanical properties are much higher than the commonly used mold copper tube materials, and the price is lower. It has been promoted and used in domestic and foreign markets and has achieved good Effect. : At present, the taper value of high-efficiency mold copper tubes used by various steel plants is generally 0.6%~0.9%m. The taper value of low-carbon steel and low-alloy steel is the middle and lower limit, and the taper of medium-carbon steel and high-carbon steel. The value takes the upper limit. In order to ensure that the inner cavity trend of the copper tube is consistent with the cooling shrinkage of the casting slab over the entire length of the mold, the inner cavity trend of the copper tube of the mold should be a parabolic continuous taper. When pouring low-carbon steel and low-alloy steel, the vertex of the parabola should be designed at the lower mouth of the copper pipe. At the same time, the taper distribution of the high-efficiency crystallizer should also match other process parameters in the drawn steel.

In recent years, in order to adapt to market demands, various steel companies have been expanding their production scales, while at the same time demanding to reduce costs as much as possible in order to make the final products more competitive in the market. This requires manufacturers that produce continuous casting spare parts to develop a mold assembly that can be replaced on the original casting machine while meeting the requirements of high drawing speed and high output. Dalian Dashan Crystallizer Co., Ltd. summed up advanced experience in crystallizer production at home and abroad, and developed a stainless steel narrow water-slit crystallizer. The water gap of the internal water jacket of this kind of crystallizer is generally 3.5~4. The straight surface and arc surface of the crystallizer copper tube adopt different tapers, and different tapers are designed according to the user's steel type, so as to better meet the user's needs. According to theoretical calculations, the steel throughput of the general (150X150X850) mm copper pipe is about 4000t, and the pulling speed reaches 3.2~3.5m/min. This kind of mold has been tried out in many steel plants across the country and has achieved good results.