Cao J.-X.,Lianyuan Iron and Steel Group Ltd. |
Tao H.-B.,Control Iron and Steel Research Institute, China |
Zhang H.,Control Iron and Steel Research Institute, China |
Zhou M.-W.,Lianyuan Iron and Steel Group Ltd. |
And 2 more authors.
Kang T'ieh/Iron and Steel | Year: 2013
In order to eliminate continuous casting slab corner crack defects of micro-alloyed steels so that the slab can meet rolling need when it is unnecessary to offline cut the corner, a lot of industrial trials were made by using the chamfered mould technology. The problem that there were some longitudinal corner cracks and sticking scars were analyzed and solved. For this reason, the chamfered mould technology can be used for large-scale continuous production. Industrial applied trials results show that the chamfered mould technology can not only control slab corner transverse cracks but also reduce substantially the rate of side direct crack occurred on the surface of hot rolling sheet of super low carbon steel. Therefore, the chamfered mould technology can bring huge economic benefit for iron and steel company.
Yang W.-Y.,Control Iron and Steel Research Institute, China |
Wang L.-L.,Anshan Research Institute of Thermo Energy |
Xiao Z.-H.,Lianyuan Iron and Steel Group Ltd. |
Wang M.-L.,Control Iron and Steel Research Institute, China |
Liu L.-C.,Wuhan Iron And Steel Company
Kang T'ieh/Iron and Steel | Year: 2014
Oxygen pressure of work in BOF is decided by nozzle Mach number. Oxygen jet penetration depth of the bath (L) and the bath depth (L0) has an appropriate ratio (L/L0). About 1/3 steel plant's working oxygen pressure is unreasonable in China. According to theoretical analysis and practical experience, working oxygen pressure is usually higher (5%~15%) than stagnant pressure according to Mach. Therefore, shockwave losses of flow jet can be reduced, penetration depth of jet is deeper and nozzle rapid melting caused by negative pressure at nozzle outlet can be prevented. Pressure losses (Δp) caused by oxygen passing through pipeline should be understand during nozzle designing. Field measurement method is comparatively reliable to get the pressure loss. ©, 2014, Chinese Society for Metals. All right reserved.
Yan J.-X.,Control Iron and Steel Research Institute, China |
Yan J.-X.,Lianyuan Iron and Steel Group Co. |
Fu B.,Control Iron and Steel Research Institute, China |
Fu B.,University of Science and Technology Beijing |
And 3 more authors.
Journal of Iron and Steel Research | Year: 2014
The precipitation behavior of MnS and A1N in low-temperature high magnetic induction grain-oriented silicon steel produced by thin slab casting and rolling process with "acquired inhibitor method" during continuous casting and soaking was studied by thermodynamic calculation. The calculated results show that A1N is likely to precipitate in ferrite after solidification. However, MnS can precipitate only in the two phase region of ferrite and austenite. Meanwhile, MnS and A1N in the steel can not be completely dissolved during the soaking stage. In addition, the abnormal growth of primary grain is not obvious after high-temperature nitriding, which indicates the number of inherent inhibitor in the steel is relatively sufficient before nitriding.