Abstract: The coil of high carbon steel SWRH82B (0. 81%C) is used for pre-stressed wire strands, and the serious net carbides in steel is important factor of wire fracture during cold drawing process. The effect of 150 mm x 150 mm casting billet stacking slow cooling time (0 ~48 h) of steel on carbon segregation in billet and carbide segregation in φ 12. 5 mm coil is tested. Results show that the deviation of carbon content in billet with direct air cooling is 0. 116%, after stacking slow cooling of billet for 12, 24, 36 and 48 h, the deviation carbon content in billet respectively decreases to 0. 088%, 0. 080%0. 075% and 0. 076%, and the rating of net carbide in coil is also corresponding decreased ； it is available to meet the requirement for cold drawing process by stacking slow cooling for 24 h of steel SWRH82B 150 mm x 150 mm casting billet.

摘要： 高碳钢SWRH82B(0.81%C)盘条用于生产预应力钢丝钢绞线,其中网状碳化物是造成冷拔断裂的重要原因。试验了该钢150 mm×150 mm铸坯堆垛缓冷时间(0~48 h)对铸坯碳偏析和φ12.5 mm盘条碳化物的影响。结果表明,直接空冷时的铸坯中碳含量的差值为0.116%,堆垛缓冷12,24,36,48 h后碳含量差值分别降至0.088%,0.080%,0.075%和0.076%,盘条中网状碳化物也相应降低;SWRH82B钢150 mm×150 mm连铸坯堆垛缓冷24 h,可以满足盘条冷拉工艺要求。

关键词: 高碳钢SWRH82B , 150 mm x 150mm连铸坯 , 堆垛缓冷 , 碳偏析