Typical surface defects of heavy plate and their controlling
The causes of the star crack,the surface transverse crack and the straight edge crack of heavy plate in Baotou Steel were analyzed.By controlling nitrogen content of microalloyed steel below 40 × 10-6,dynamic adjusting the cooling water volume in continuous casting process to ensure the straightening temperature of slab in the plastic area,reasonable selecting the mould powder in continuous casting process,increasing the slab pushing out temperature in heating furnace,reducing the influence of cooling water of mill roller on the temperature drop of the bottom surface of plate,decreasing the temperature difference between the upper surface and the bottom surface to relieve the folding extent caused by metal liquidity differences,the defects such as star crack,surface transverse crack,straight edge crack and so on were controlled effectively.Both the hot delivering and charging rate of the production line and the yield of plate were improved.
heavy platestar cracksurface transverse crackstraight edge cracknitrogen content controlling
NETL
NSTL
万方数据
维普
