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Kinetics of hydrogen reduction and the influence of gas composition on hot- rolled steel scale after temper rolling

Baosteel Technical Research 2014年第4期8卷 48-52页

作者： GUAN Chuang LI Jun TAN Ning ZHANG Shuguang School of Materials Science and Engineering Shanghai Jiaotong University Research Institute Baoshan Iron & Steel Co.Ltd.

For replacing the presently employed pickling method with a more environmentally friendly descaling method, hydrogen reduction of oxide scale formed during hot rolling was studied at 800℃ under a varied atmosphere. The hydrogen level and water vapor content in the reducing atmosphere were found to influence the reduction rate wherein increasing hydrogen level as well as decreasing water vapor content resulted in faster oxide reduction. The reduction reaction substantially obeyed a parabolic rate law. oxide scale of a usual thickness （approximately 7 micrometer） could be reduced almost completely in an atmosphere of 20 vol. % hydrogen with a water vapor content corresponding to a -40℃ dew point at 800℃. When lowering the hydrogen level to 10% and increasing the water vapor content to a 10℃ dew point,quite a large extent of the oxide scale was retained,which might be attributable to the formation of an outermost dense layer of pure iron at the early stage of reduction.

关键词： oxide scale hydrogen reduction pickling

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Friction in the Roll Bite Under Various Hot Rolling Conditions

Friction in the Roll Bite Under Various Hot Rolling Conditio...

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山东金属学会压力加工学术交流会

作者： K.Tieu Faculty of Engineering University of Wollongong NSW2522 Australia

In this paper, the effect of hot rolling parameters on the friction coefficient was studied by inverse calculation on the experimental roll loads where the hot rolling experiments were carried out at 7.5-45.0% reductions, 0.12-0.72m/s speeds and temperature of 850-1025℃. Dry rolling, water, oil/water mixture emulsion and pure oil were used as lubricants in the experiments. In carrying out the calculation, a flow stress model for the present test material was first obtained experimentally. Hot rolling parameters, including reduction, roll speed, work piece entry temperature and lubrication conditions, were investigated to determine their effect on friction coefficient and mill loads. The effect of oxide scale thickness after rolling on friction was also examined.

关键词： friction coefficient oxide scale lubrication hot rolling of steel

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