To meet uninterruptedly increasing in the demand for the coldrolledsteel sheets and to meet the technological demand of continuous annealing, the production of ultra-low carbon steel is increasing.
为了满足市场对冷轧薄板钢需求量的不断增加和连续退火工艺要求，超低碳钢生产也在不断增加。
2
The results obtained show the microstructure characteristics of the welded HAZ of the coldrolled low carbon sheets (steel a and b) are same, but the ferrite grain sizes are different.
结果表明：钢a和钢b冷轧低碳钢板焊接HAZ具有相同的显微组织特征，但铁素体晶粒大小不同。
3
High cleanliness is required for low carbon aluminum killed (LCAK for short) steel which is widely used for production of coldrolled sheet.