M. Cheng
,
J. Cheng
,
S.Q. Yuan and F. Zhao(North China Institute of Technology
,
Taiyuan 030051
,
China)
金属学报(英文版)
On the basis of experimental studies, a program dealing with the boundary condition in the quenching process has been developed. In this program the method of Beck nonlinear estimation (inverse heat conduction method) was adopted so that the problem of the heat transfer coefficient varying significantly and complicatedly in the quenching process, has been effectively solved. Calculation result shows that the heat transfer coefficient between quenching workpiece and media boundary has a peak value, and this value and the temperature interval in which the peak value occurs vary with the cross section dimensions of workpiece, the types of the quenching media, the temperature and the surface position.
关键词:
quenching
,
null
,
null
JIANG Xiao-fang
,
Yang Wen-yuan
钢铁研究学报(英文版)
The high efficient blowing technique includes increasing oxygen supply intensity and optimizing slag forming. The oxygen supply intensity on 300t converters of No1 steelmaking shop at Bao Steel reaches 3.83 Nm3/t.min, and at Taiyuan Steel, Lianyuan Steel, Pinxiang Steel and other steel plants, the oxygen supply intensity on medium converters is in the range of 4.0-4.4 Nm3/t.min. The productivity of converter can be increased by 8-15% with adoption this technique. The whole technique, including design and manufacture of lance nozzle with reasonable pacnolontenue of outlets, technique of oxygen supply and slag forming, has been developed by CISRI to meet the need of technique transfer.
关键词:
converter;oxygen supply intensity;oxygen blowing time;efficient of dephosphorization
