To obtain a low cost, environmentally friendly and effective lubricant, a novel nanoTiO2 additive oil-in-water (O/W) lubricant for hot steel rolling has been developed. Based on the contact angle, tribological and hot rolling tests, the performance of the nanoTiO2 additive O/W lubricants was evaluated and discussed. The results show that the strongest adhesion force between the nanoTiO2 additive O/W lubricant and the work roll is obtained after addition of 4% nanoTiO2 additive in the 1% O/W lubricant. The nanoTiO2 nanoparticles can reduce coefficient of friction (COF) and rolling force, and enhance the surface quality of the hot-rolled product. The lubrication mechanism of nanoTiO2 additive O/W-based lubricant has been proposed.

H-beam will inevitably produce temperature uneven in cooling process, causing the uneven deformation phenomenon in H-beam cross section, and therefore how to improve H-beam cooling distortion uniformity become a research priority of H-beam. In this paper, the deformation of H-beam was simulated in the cooling process by using finite element analysis software ANSYS, and the simulation results was compared with measured data. Uneven cooling rate between up and down groove of the H-beam caused the out of square. Uneven cooling rate for the R corner and web surface was simulated, the conclusion is that uneven cooling rate for the web is the main reason of the out of square, and that of R corner is the second factor.

With advanced high-strength steels and high value-added steels development, it is urgent to innovative run out table cooling line in hot strip mill with flexible cooling capacity to meet products metallurgical requirements of the cooling rate after rolling. The way to increase the cooling capacity is to improve the effect of heat exchange of water forced convection with hot strip. Then to raise the spraying pressure to penetrate the residual water and break the vapor inside it is the most feasible method. So, how to control the variable frequency device providing variable spraying pressure is the object of this study. Firstly, cooling after rolling process requirement under ultra fast cooling was analyzed; secondly, characteristic curves of centrifugal pump and water supply pipeline were tested; then inverter timing control, interlock control, security control and so on were studied. Since online application of the variable frequency control system, the water supply system has been running stably and reliably

Temperature of the head, the waist, the bottom and angle of the bottom of same heavy rail lying on the cooling bed is tested continuously, time interval is 5min, which can provide the basis for prebending process. Additionally, the U75V 60Kg/m heavy rail straightening processes using the horizontal and edge roll compound straightening machine is discussed in this paper, and contrasts the cross-section dimension and straightness of heavy rail before and after being straightened, which is important to make certain of optimum straightening parameters.

As to current problem of straightness defects and uneven quenching thickness of rail head, heating device with several induction loops are used, and through a three step strategy to realize simultaneously heating to head and bottom of rail. In air jetting phase, spray nozzles are replaced by Al alloy plates(20mm thick) with holes, adjusting to cooling strengthen can be realized by changing cross-section of holes, cooling rate is 2~4°C/sec. After the air jetting phase, there is a waterfog jetting phase, which makes 200°C temperature gap between head and bottom of rail, to ensure quenched rail has good straightness after 48h natural aging.