关键词: 冷镦钢10B28 , 线材, 结疤, N含量, 缓释脱氧剂

Abstract: Through the analysis it is obtained that main reason for steel 10B28 scab is that nitrogen content in the molten steel is too high,and titanium in molten steel is not enough to completely fix nitrogen,resulting in a large number of fine BN precipitates at grain boundary, and the slab cracks are formed in the straightening process to form the wire surface scab in rolling process. Through sampling analysis, it is confirmed that the main cause of high nitrogen content in molten steel is slagging to use high nitrogen content (4.6% ) slow-release deoxidizer during refining. By using aluminum shot to replace slow-release deoxidizer , the nitrogen increases in refining process can be reduced from 43. 4 x 10^-6 to 11.4 x 10^-6. By the measures including increasing the BOF tapping carbon from 0.06% to ≥ 0.08% ,reducing the heating power in the early stage of refining, and replace slow-release deoxidizer by Al shot, the nitrogen content of steel 10B28 is stably controlled below 70 x 10^-6,and the qualified rate of wire rod is increased from less than 50% to ≥ 98%.

Key words: Cold Heading Steel 10B28 Wire Rod, Scab, Nitrogen Content, Slow Release Deoxidizer