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| Application of Soft-Reduction Technology on Continuously Cast Slab in Lianyuan Steel |
| CAO Jian-xin1,YANG Xiu-zhi1,XIAO Yue-qi1,LIU Wen-hua1,YU Yun-lü1,XU Li-jun2 |
1.Valin Lianyuan Iron and Steel Co., Ltd., Loudi 417009, Hunan,China
2. Continuous Casting Center of Central Iron and Steel Researching Institute Group Co., Ltd., Beijing 100081,China |
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Abstract The soft-reduction effect appears poor when it’s adopted in the No.1 caster of Lianyuan Steel with both center porosity and center segregation, whose class are as high as 2.0. Through the nail shooting test, it’s found that the actual length of liquid core is about 1.6－4.2m shorter than what is calculated by model, so the parametric correction was done on caster’s prediction of solidification end. In addition, soft reduction parameters for normal and abnormal casting condition were defined on the basis of fundamental roll gap. The optimized soft-reduction lowered the rank of center porosity and center segregation to class 0.5, and the C and Mn content in different positions of slab’s cross section are very homogeneous, which meet the process requirement.
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Received: 31 May 2012
Published: 22 February 2013
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2013, Vol. 32 
