鞍钢技术
鞍鋼技術
안강기술
AISC TECHNIQUES
2015年
1期
56-59
,共4页
方恩俊%崔福祥%康伟%廖相巍
方恩俊%崔福祥%康偉%廖相巍
방은준%최복상%강위%료상외
低合金钢%连铸坯%晶界裂纹
低閤金鋼%連鑄坯%晶界裂紋
저합금강%련주배%정계렬문
low alloy steel%continuous casting slab%grain boundary crack
分析了低合金钢连铸坯热装轧制时钢板表面晶界裂纹缺陷产生的原因。根据入炉前铸坯表面温度及相应的冷却制度，进行了工业试验。试验结果表明，入炉前铸坯表面温度小于450℃或大于750℃时不产生晶界裂纹。采取下线冷却工艺后，低合金钢厚铸坯轧后的晶界裂纹从原来的27.3%降低到0。
分析瞭低閤金鋼連鑄坯熱裝軋製時鋼闆錶麵晶界裂紋缺陷產生的原因。根據入爐前鑄坯錶麵溫度及相應的冷卻製度，進行瞭工業試驗。試驗結果錶明，入爐前鑄坯錶麵溫度小于450℃或大于750℃時不產生晶界裂紋。採取下線冷卻工藝後，低閤金鋼厚鑄坯軋後的晶界裂紋從原來的27.3%降低到0。
분석료저합금강련주배열장알제시강판표면정계렬문결함산생적원인。근거입로전주배표면온도급상응적냉각제도，진행료공업시험。시험결과표명，입로전주배표면온도소우450℃혹대우750℃시불산생정계렬문。채취하선냉각공예후，저합금강후주배알후적정계렬문종원래적27.3%강저도0。
The causes leading to grain boundary cracks occurred on the surface of low alloy steel sheets by rolling hot charging continuous casting slabs are analyzed. Industrial experiments are carried out according to the surface temperature of the slabs prior to entering the reheating furnace and the corresponding cooling schedule. The testing results show that the cracks can be avoided when the surface temperature of the slabs prior to entering the reheating furnace is less than 450℃or more than 750℃. The percentage of cracks is reduced to 0 from 27.3% after using off-line cooling process.
