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我公司自1963年四季度以来,下注镇静钢钢锭均采用石墨渣保护浇注。此法对提高钢锭的质量、各项经济技术指标和改善炉后工人的劳动条件,都起到了良好作用。过去,我们曾采用焦油涂模、木框保护法浇注扁形钢锭,当注温过高或注速过快时,易于在钢锭宽面中部产生很深的横裂纹。如注速过慢,在钢液表面又易形成冷皮,特别是钢中含残余金属铝较高的钢种。此种冷皮如果在注
My company since the fourth quarter of 1963, betting calm steel ingot are used graphite mold protection pouring. This law to improve the quality of ingots, various economic and technical indicators and improve the working conditions of workers after the furnace, have played a good role. In the past, we used tar coating, wood frame protection pouring flat steel ingot, when the injection temperature is too high or injection speed is too fast, easy to produce deep transverse cracks in the wide ingot surface. If the injection speed is too slow, the surface of the molten steel and easy to form a cold skin, especially the steel containing higher residual aluminum metal. Such a cold skin if the note