摘要
为了分析2507不锈钢板坯气孔产生原因,用金相显微镜和扫描电镜对气孔进行分析。结果表明,2507不锈钢气孔产生的主要原因有2个方面:一是由于中间包耐火材料烘烤不干,水蒸气进入钢液分解为[O]和[H]原子,[H]在凝固时析出产生气泡;二是钢水中N含量太高,在钢水凝固时,由于溶解度急剧减少,N2从钢水中析出,形成形状不规则的氮气孔。因此,氢气孔和氮气孔是造成连铸坯气孔的主要原因。
For the purpose of analysis reasons of the blow hole of 2507 duplex stainless steel, metallurgical microscope and SEM were used. The results show that, the blow hole of 2507 stainless steel is caused mainly by two reasons. One reason is that the water of refractory material of pouring basket. The water of refractory material resolves into [O] and [H] atoms, [H] precipitation during solidification is one of the sources of the blow hole in the continuous cast slab. On the other hand, the nitrogen content in molten steel is too high, the nitrogen solubility in liquid steel decreases sharply when solidification, nitrogen in molten steel generates from precipitation, then the irregular shape of the nitrogen hole is produced. So, the blow hole of hydrogen and nitrogen are the major causes of blow hole of continuous casting slab.
出处
《钢铁》
CAS
CSCD
北大核心
2013年第12期41-45,共5页
Iron and Steel
关键词
双相不锈钢
耐火材料
连铸坯
气孔缺陷
duplex stainless steel
refractory material
casting slab
blow hole defect
