Latest ArticlesIn the paper, it is introduced the La0.75Ce0.25 (NiCoMnAl) x (x = 4.95, 5.05, 5.15, 5.25) series of alloys were prepared with the induction melting method. The XRD test was carried out for the series of alloys and their phase structure was analyzed; their electrochemical performances were tested with the dual electrodes method and the PCT hydrogenation and dehydrogenation test was carried out. The results showed that all the four samples were with LaNi5 phase of CaCu5 structure, their phase composition was not changed by adjusting the stoichiometric ratio; their maximum hydrogen storage capacity decreased with the increase of stoichiometric ratio, their plateau pressure decreased first and then increased; with the gradual increase of stoichiometric ratio, their discharge capacity decreased gradually; the high-rate performance increased first and then decreased, their maximum 3C HRD value reached 89.6% when the stoichiometric ratio was 5.05; their cycling stability was enhanced with the increase of stoichiometric ratio.
In this paper, several selection methods for consistency of metal hydride-nickel battery were studied and they are applied for selecting batteries in actual productions. The results showed that the expected goals could be achieved so that the selected batteries were guaranteed to be with good consistency, which could meet the use requirements of high-end series and banked battery. As a result, the consistency of battery and product quality are improved as well as the hidden troubles of safety and after sale are eliminated effectively.
In this paper, the 600 MPa high-strength lightweight automobile beam steel is mainly studied combining with the technology and equipment conditions for 2 250 mm hot rolling production line of Baotou Steel. The BT610L beam steel with fine grain, good strength and toughness and formability was successfully developed with the alloying design of low C, Nb and Ti through laboratory research, industrialized trial production and process optimization.
In this paper, it is introduced the T [O]<0.001 5% is realized by such measures as optimizing the argon flow in calcium treatment process to improve the effects that deoxidation products float up into steel slag and improving the structure of tundish to improve flow field so that the flotation of inclusions is accelerated. As a result, the amount of Al2O3 inclusions in molten steel is effectively reduced, the DWTT properties of coiled sheet could meet the standard requirements as well as the aim of stable development and production of 22 mm thick hot-rolled strip with X80M pipeline steel was realized.
In this paper, the effects of rare earth Ce on the microstructure of slab and as-hot-rolled microstructure of oriented silicon steel are introduced. The cold acid and optical microscopy are used for observing whether there is slab with the rare earth and as-hot-rolled microstructure as well as comparing and analyzing the functions of rare earth. The results showed that the rare earth Ce could improve the microstructure of slab of oriented silicon steel, increase the ratio of equiaxed crystal and refine part of columnar crystal. As the second-phase particle, the rare earth Ce plays the role of pinning to prevent excessive growth of crystal grain during hot rolling, refine crystal grain and make the recrystallized grain increased.
A large number of technological breakthrough and process optimization researches on quality control of bloom SWRH82B of Baotou Steel have been carried out. In this paper, it is introduced the control level for inclusions of casting blank is improved as well as the amount, shape and size of inclusions in bloom are effectively controlled and improved through studying and optimizing the key technologies of controlling inclusions for converter, external refining and continuous casting process in steel making.
In the paper, it is introduced such problems as bending deformation, stress distribution, yield point elongation and strain aging of steel coils in the processes of uncoiling and straightening are analyzed with such knowledge as elastic-plastic mechanics and metal science aiming at the cross cracks defect during uncoiling hot rolled low carbon steel coil. It is considered that the main cause for cross cracks defect is not the problem of strip shape, but the yield point elongation common for low carbon steel so that the basis for eliminating the cross cracks defect is provided.
In this paper, it is introduced the design of chemical component for 400 MPa cold rolled slide steel as well as two hot rolling and annealing processes are adopted for trial production. Moreover, the mechanical properties, metallographic structure and test items of customers for steel coils were compared and analyzed. The final results showed that the products with low temperature coiling and low temperature annealing could satisfy the requirements of customers.
The experimental study on the hardenability of G105 and S135 grade petroleum drill pipe body steel produced by Baotou Steel is introduced in this paper. The results showed that the two steel grades were with good hardenability. With the quenching temperature of 880~900 ℃, the hardening layer depths of the minimum 50%, 90% and 95% martensite rockwell hardness numbers were 15 mm, 9 mm and 7 mm for G105 steel; the hardening layer depths of the minimum 50%, 90% and 95% martensite rockwell hardness numbers were 35 mm, 18 mm and 15 mm for S135 steel.
In this paper, the effects of rolling force on the elastic deformation of roller are discussed so as to obtain the effects of rolling force on shape of steel plate. The shape of steel plate for 2 250 mm hot continuous rolling production line of Baotou Steel is improved effectively by adjusting the load distribution of finishing mill group with the law.
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