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Baotou, China

Li Z.-F.,Inner Mongolia University of Science and Technology | Ma Y.-L.,Inner Mongolia University of Science and Technology | Feng Y.,Baotou Steel Union Co. | Gong M.-N.,Inner Mongolia University of Science and Technology | Xing S.-Q.,Inner Mongolia University of Science and Technology
Kang T'ieh/Iron and Steel | Year: 2014

In order to solve the problem of 301S stainless steel strip surface hardness control, the production process of cold rolling 301S stainless steel strip was investigated, and the key process parameters affecting the surface hardness of cold rolling stainless steel strip were obtained, which were tensile strength, rolling speed, temperature of rolling oil and reduction rate. A non linear reflection model was built for predicting the surface hardness of the stainless steel strips by using BP neural network, and the collection of illustrative plates of predicting data were achieved by this model. The results show that the variation of reduction rate affects surface hardness values significantly, and the influence of other parameters on the hardness value is about 10 HV. The relative error between predicted and tested results of the surface hardness is between -2.63% and 2.76%. The neural network model can be used in the field of online control of product quality. Source


Jiang L.-Y.,Taiyuan University of Science and Technology | Yuan G.,Northeastern University China | Shi J.-H.,Northeastern University China | Xue Y.,Baotou Steel Union Co. | And 2 more authors.
Metallurgical Research and Technology | Year: 2015

Higher cooling capacity is required after laminar cooling in order to develop dual-phase (DP) steel, and late ultra-fast cooling (UFC) equipment that was installed between the laminar cooling equipment and down coiler in a CSP line was developed. The strip temperature distribution along the thickness will affect the uniformity of the microstructure and properties, so in-depth research on the temperature distribution changing law during the ultra-fast cooling process should be conducted. The strip temperature was obtained by the numerical calculation method. By comparison some conclusions were obtained: the UFC re-reddening temperature decreases with an increase in the ultra-fast cooling rate and they present a quadratic relationship. The maximum temperature deviation between the center and surface, surface and boundary layer and center and boundary layer can be increased with an increase in the ultra-fast cooling rate, and they present a quadratic relationship. The finishing delivery temperature (FDT) and medium temperature (MT) do not affect the UFC re-reddening temperature obviously when the ultra-fast cooling rate is constant. There is a boundary layer along the thickness. The position of the boundary layer will remain in 1/4 strip thickness and the ultra-fast cooling rate, FDT, MT and strip thickness do not affect it. These results will provide a referenced role for the establishment of the ultra-fast cooling process. © EDP Sciences, 2015. Source


Li X.,Baotou Steel Union Co. | Shi X.-X.,Baotou Steel Union Co. | Jiang T.,Baotou Steel Union Co. | Guo Z.-C.,Baotou Steel Union Co.
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2012

For improving the impact toughness of A333Gr.3 cryogenic seamless tubes, the chemical composition, hazardous element, gas content, rolling state mechanical properties, metallographic structure and mechanical properties of three kinds of cryogenic seamless steel tubes after heat treatment were analyzed and compared. Carbon content has obvious influence on the low-temperature impact toughness of the steel tubes. The lower the carbon content is, the higher the impact toughness is. The brittle transition temperature can be obviously improved by the phosphorus content of the steel, so the phosphorus content of the steel should be reduced. At the same time, the rolling temperature of the steel tubes should be controlled, the finishing rolling temperature of the steel tubes should be reduced, the cooling velocity should be enhanced, and the grain size should be refined. These measures are beneficial to enhance the low-temperature impact toughness of the steel tubes. Source

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