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METHOD FOR REMOVING FINE INCLUSION IN MOLTEN STEEL

机译：消除钢中细小夹杂物的方法

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摘要

PROBLEM TO BE SOLVED: To highly efficiently remove the fine inclusion having a diameter less than 50 μm and causing surface flaws or breakdown when injecting the molten steel in a ladle from an injection nozzle into a tundish.;SOLUTION: A method for removing fine inclusion in a molten steel includes: (x) feeding an inert gas in an injection nozzle 4, and immersing the injection nozzle into the molten steel in a tundish 2 to feed the molten steel; (y) controlling the collision speed V [m/s] of the molten steel to that in the tundish defined by expressions (1), (2) mentioned below to 10 to 20 m/s; and (z) convoluting the inert gas in the injection nozzle into the molten steel to generate 10 pieces/cm³ or more of bubbles 7 having the diameter of 0.1-3.0 mm in the molten steel beneath the lower face of the injection nozzle. Expression (1) is V=[2g(C²HL+HT)+(2C²/ρ)P]^0.5 and expression (2) is C=U(2gHL)^-0.5 (wherein, U is a dropping speed [m/s] of the molten steel at the outlet side of the ladle; HL is the height [m] of the molten steel in the ladle; HT is the dropping distance [m] between the ladle and the tundish; C is the flow rate coefficient at the outlet side of the ladle; ρ is a molten steel density [kg/m³]; P is (barometric pressure in the ladle)-(that in an outer cylinder) [Pa]; and g is a gravitational acceleration [m/s²]).;COPYRIGHT: (C)2016,JPO&INPIT

机译：解决的问题：要有效地去除直径小于50μm的细小夹杂物，并在将钢包中的钢水从注嘴注入中间包时引起表面缺陷或破裂;解决方案：一种去除细小夹杂物的方法在钢水中，其包括：（x）将惰性气体供给到喷嘴4中，并将所述喷嘴浸入中间包2中的钢水中以供给钢水; （y）将钢水的碰撞速度V [m / s]控制为下述式（1），（2）所定义的中间包的碰撞速度V [m / s]为10〜20m / s。（z）将注入喷嘴中的惰性气体卷入钢水中，以在下部下方的钢水中产生10个/ cm ^{3 或更多的直径为0.1-3.0 mm的气泡7。喷嘴的正面。表达式（1）为V = [2g（C ^{2 HL + HT）+（2C ^{2 /ρ）P] ^{0.5 且表达式（ 2）为C = U（2gHL）^{-0.5 （其中，U为钢包出口侧钢水的下落速度[m / s]; HL为高度[m] HT是钢包和中间包之间的下落距离[m]; C是钢包出口处的流速系数;ρ是钢水密度[kg / m ^{3 ]; P是（钢包中的大气压）-（外筒中的大气压）[Pa]; g是重力加速度[m / s ^{2 ]）。版权所有（C）2016，JPO＆INPIT}}}}}}}

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公开/公告号JP2015188893A

专利类型
公开/公告日2015-11-02

原文格式PDF
申请/专利权人 NIPPON STEEL & SUMITOMO METAL;
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申请/专利号JP20140066130
发明设计人 MIYAZAKI MASAFUMI;
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申请日2014-03-27
分类号B22D11/11;B22D11/10;B22D41/58;
国家 JP
入库时间 2022-08-21 15:34:52

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