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METHOD FOR CONTINUOUSLY CASTING CAST SLAB FOR ULTRA-THICK STEEL PLATE
METHOD FOR CONTINUOUSLY CASTING CAST SLAB FOR ULTRA-THICK STEEL PLATE
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机译:连续铸造超厚钢板铸坯的方法
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摘要
PROBLEM TO BE SOLVED: To provide a method for continuously casting a cast slab as a blank for producing a high strength ultra-thick steel plate excellent in the inner quality having no defect in an ultra-sonic flaw examination by using the existing rolling mill for thick plate.;SOLUTION: In the continuous casting method for the cast slab to be used as the blank for ultra-thick steel plate excellent in the inner quality obtained by hot-rolling on the condition that a rolling-reduction ratio (r) till finish-rolling is 1.5-2.5, one pair of upper and lower rolling-reduction rolls disposed in the continuous casting machine or the end of this machine is used to continuously cast the cast slab for ultra-thick steel plate, wherein the width center part of the cast slab containing non-solidified part is rolled in the range of the rolling-reduction amount d(mm) where the center porosity volume Vpo (cm3/g) of the cast slab satisfies the relation of 0.15×10-4≤Vpo≤0.9×10-4, in the range of 0.8 to1.0 of a solid phase ratio at the thickness center part.;COPYRIGHT: (C)2008,JPO&INPIT
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机译:解决的问题:提供一种通过使用现有的轧机连续铸造铸造的板坯作为坯料的方法,以生产内部质量优良,在超声波探伤中没有缺陷的高强度超厚钢板。解决方案:在连铸方法中,将铸坯用作超厚钢板的坯料,其内部质量在热轧率(r)达到终轧为1.5-2.5,设置在连续铸造机或本机端部的一对上下压下轧辊用于连续铸造超厚钢板的铸坯,其中宽度中心部分包含非凝固部分的铸坯的板坯在中心孔隙体积Vp o Sub>(cm 3 Sup> / g的压下量d(mm)的范围内进行压延的铸坯)满足0.15×10 -4 Sup>的关系&le; Vp o Sub>&le; 0.9&times; 10 -4 Sup>,在厚度中心部分的固相比在0.8到<1.0的范围内。 C)2008,日本特许厅
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