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CAST SLAB, HOT ROLLED STEEL SHEET, COLLED ROLLED ANNEALING STEEL SHEET OF ULTRALOW CARBON STEEL AND METHOD FOR PRODUCING THE COLLED ROLLED ANNEALING STEEL SHEET
CAST SLAB, HOT ROLLED STEEL SHEET, COLLED ROLLED ANNEALING STEEL SHEET OF ULTRALOW CARBON STEEL AND METHOD FOR PRODUCING THE COLLED ROLLED ANNEALING STEEL SHEET
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机译：铸坯，热轧钢板，超低碳钢轧制退火板和生产轧制退火板的方法
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摘要
The present invention provides ultralow carbon thin gauge steel sheet and a method for producing the same where coalescence and growth of inclusions in the molten steel are prevented and the inclusions are finely dispersed in the steel sheet, whereby surface defects and cracks at the time of press forming are prevented, growth of recrystallized grains at the time of continuous annealing is promoted, and a high r value (r value‰¥2.0) and elongation (total elongation‰¥50%) are exhibited, that is, ultralow carbon thin gauge steel sheet excellent in surface conditions, formability, and workability comprising, by mass%, 0.0003%‰¤C‰¤0.003%, Si ‰¤0.01%, Mn ‰¤0.1%, P‰¤0.02%, S‰¤0.01%, 0.0005%‰¤N‰¤0.0025%, 0.01%‰¤acid soluble Ti‰¤0.07%, acid soluble Al ‰¤0.003%, and 0.002%‰¤La+Ce+Nd‰¤0.02% and the balance of iron and unavoidable impurities, said steel sheet characterized by containing at least cerium oxysulfite, lanthanum oxysulfite, and neodymium oxysulfite.
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机译：本发明提供了一种超低碳薄规格钢板及其制造方法，其中，防止了钢水中夹杂物的聚结和生长，并且夹杂物细微地分散在钢板中，从而在压制时存在表面缺陷和裂纹。防止了成形，促进了连续退火时再结晶晶粒的生长，并且表现出高r值（r值≥2.0）和伸长率（总伸长率≥50％），即超低碳薄规格钢表面质量，成形性，加工性优异的片，以质量％计，为0.0003 ％‰C≤0.003％，Si‰0.01％，Mn≤0.1％，P‰0.02％，S‰0.01％， 0.0005%‰N‰0.0025％，0.01%‰酸溶性Ti‰¤0.07％，酸溶性Al‰0.003％和0.002％La + Ce + Nd‰0.02％，其余的铁和所述钢板具有不可避免的杂质，其特征在于至少包含亚硫酸铈铈，亚硫酸镧和亚硫酸钕。
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