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冷拉轴承钢(GCr15)的脱炭是个老大难问题,一直影响着轴承钢产量扩大和成材率提高,且经常发生脱炭退货。上钢五厂采用热轧材球化处理前增加浸硫酸处理的新工艺,以达到减薄热轧脱炭层改善热处理时表面产生脱炭,确保成品钢材脱炭质量。本工艺操作简单,系利用该厂生产中的废酸液,应用方便仅要在 H_2SO_48～15%浓度、FeSO_4浓度50—90克/升,60℃左右酸液中酸浸2分到5分钟即可。浸酸法是利用浸酸后 GCr15表面生成一层 FeSO_4,使钢材表面避免和炉膛内的氧化气氛直接反应。从而减少了钢材表面脱炭,取消磨削脱炭工序,使成材率提高到93%以上,单产利润由浸酸
Cold-drawn bearing steel (GCr15) off carbon is a chronic problem that has been affecting the production of bearing steel to expand and improve the yield, and often take off the carbon return. Fifth steel plant on the hot-rolled ball treatment before the increase of dip sulfuric acid treatment of new technology to achieve thinning hot rolled off the carbon layer to improve the surface heat treatment decarbonization to ensure the quality of finished steel off carbon. The process is simple, the use of the factory in the production of waste acid, easy to use as long as the H_2SO_48 ~ 15% concentration, FeSO_4 concentration of 50-90 g / L, 60 ℃ acid leaching 2 minutes to 5 minutes or can. Acid pickling is the use of acid after GCr15 surface layer of FeSO_4, so that the surface of the steel and the furnace to avoid the direct reaction of the oxidizing atmosphere. Thereby reducing the carbon off the surface of the steel, abolition of grinding off the carbon process, the finished product rate increased to 93% or more, yield profit from pickling