Application of Surfacing Technology in Continuous Casting Equipment
Release time:
2024-09-16
At present, the continuous casting roller has almost all been changed to the composite roller of surfacing alloy, as a pre-protection measure, not just as a means of repair. The wear resistance, corrosion resistance and thermal fatigue resistance of the continuous casting roller have been greatly improved. Due to the effect of thermal alternating stress, there is a widespread problem of thermal fatigue failure of rollers. A large number of annular thermal fatigue cracks are easy to appear along the welding path of the roller body, serious welding layer shedding, and even roller fracture has become a long-standing problem affecting production.
There are more than 200,000 continuous casting rolls using WELDCLAD surfacing technology in the world, and WELDCLAD are suppliers of continuous casting roll surfacing technology and materials designated by Austrian Steel Union (VAI), Danieli (Danieli), Simac (SMS), Demark (Demark), David (Davy) and other companies. Its mature experience and technical know-how lies in the WELDCLAD of the company's unique swing type automatic welding equipment and specially developed for continuous casting roller WELDCLAD3 series of welding materials, with good welding characteristics and heat treatment performance, welding metal oxygen content is very low, compared with the traditional submerged arc welding and open arc welding. Greatly reduce the heat influence between the weld bead and intergranular corrosion and inclusions, porosity, eliminate the continuous casting roll in use of thermal fatigue cracks, so that the life of the continuous casting roll is greatly improved. The service life cycle has reached 5 million tons of continuous casting billet, and the average 1.5 million tons of billet is only 1mm worn. The nickel-based WELDCLAD900 successfully solved the problems of corrosion resistance and thermal fatigue of the foot roller under the crystallizer and the small roller in the front part of the 0 section, and increased the life of the small roller by 7-10 times, and the steel throughput could reach 1 million tons.
WELDCLAD2000 adding ultra-fine WC into the material, the performance is improved compared with the 3 series. Life is increased by 50% on the original basis. The WLDC3M2H/L of the surfacing material of the two layers can ensure that the best surface surfacing metal composition can be obtained by surfacing two layers, so that the surfacing cost is greatly reduced. By adapting the material and heat treatment process, the best use effect of each segment roller can be obtained. The roller skin of the electromagnetic stirring roller is a special non-magnetic steel with high price, and the special 316F can be successfully surfacing to repair the electromagnetic stirring roller.
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