Latest ArticlesIn this paper, the life cycle assessment (LCA) results for U76CrRE rail produced by Baotou Steel were calculated and obtained by carrying out its LCA study. The distribution of its environmental influencing factors at each stage was analyzed as well as the energy consumption of each production process and the composition for carbon emission of outsourced products are further analyzed. The study results provide the scientific data support for the ecological design and green manufacturing of U76CrRE rail.
There are adverse effects of residual Ti on the final magnetic property of silicon steel, so the Ti content should be strictly controlled to be as low as possible when smelting silicon steel. In the paper, the sources and increment for the content of harmful element Ti are analyzed based on the data of Ti content after adding the ferrosilicon and ferro-aluminium into 60 heats of silicon steel with different thicknesses of slag layer. With the increase of silicon steel grade, the Si contentin in siliconstal is increased and the quantity of the ferrosilicon added is also increased so that the Ti content rises correspondingly; it is crucial for controlling the end-point Ti content of molten steel to reduce the thickness of slag layer simultaneously.
The fracture, inclusions and morphology of cracked BT510L were analyzed with the scanning electron microscope and metalloscope aiming at the cracking in cold bending of BT510L steel for a car factory supplied by Rare Earth Steel Plate Plant. Meanwhile, the influences of impurities such as P and S in the batch of steel were invesgated. The results showed that the inclusion of manganese sulfide at the fracture of crack was the main cause. The content of sulfur in molten steel is reduced and such defects are avoided by optimizing the control technology in refining process.
The 590 MPa grade cold rolled dual-phase steel was developed in the laboratory, its chemical composition, rolling and continuous annealing processes were studied, the mechanical properties were measured and the microstructure was analyzed as well as the effects of levelling elongation on the mechanical properties of steel belt were analyzed combining with the experimental results. The results indicated that the cold rolled dual-phase steel was with good mechanical properties by heat preservation at 820 ℃, slow cooling to 680 ℃, then rapid cooling with the rate of over 30 ℃/s to 270 ℃ to be overaging with the levelling elongation of 0.8%. Its yield strength was 376 MPa, tensile strength was 652 MPa and elongation reached 21%.
The causes for such rolling instabilities of medium and high grade non-oriented silicon steel in the hot continuous rolling process as poor strip shape, drift and scrap steel are analyzed. Starting from the influence mechanisms of stable rolling, the quick open control strategy of reheating furnace is developed by analyzing such five influencing factors as the rolling phase change zone, temperature difference of the same plate by slab reheating, strip shape of rough rolling, deformation resistance and finishing rolling speed models; the rolling phase change point is calculated and the pass distribution of rough rolling is optimized; the stability of medium and high grade non-oriented silicon steel in rolling process is improved by considering the influences of all elements on deformation resistance model of finish rolling and changing the control mode of finish rolling speed.
In the welding process for X65Q steel grade line pipe, there were such defects as microcrack and contraction cavities in the weld joint, so the chemical composition and microstructure of tube body were tested as well as the solidification process of weld joint was analyzed. The results indicated that the higher energy intensity of weld line and the lower cooling intensity after welding were the main causes for the above welding defects. Based on this, the corresponding improvement measures are proposed.
The hardenability of Y37MnCrBS steel is improved through a series of measures such as micro-alloying, formulating rigorous and reasonable manufacturing technique as well as controlling narrow component of molten steel to make all the properties of steel could meet the requirements of technical condition and all the performance indexes of Y37MnCrBS free-cutting steel produced by Baotou Steel could reach the level of the same industry.
In this paper, the main causes for leakage of cooling jacket are found out through analyzing the inner structural style of cooling jacket, quality of circulating water, production process and operation aiming at the problem that the cooling jacket of first dust remover for 200 t/h large coke dry quenching device often leaks in production run. Moreover, the optimization and improvement measures are proposed to extend its service cycle.
In this paper, the technical scheme for replacing middle section of furnace shell and cooling wall by suspending upper furnace shell in the medium repair of blast furnace is introduced, the finite element strength check for suspending tie rod and support beam was carried out with the SolidWorks Simulation software as well as it is compared and analyzed with the monitoring data for sinking of furnace shell in engineering practices.
In this paper, it is mainly elaborated the current situation and existing problems of electric blower with high electricity consumption of per ton of iron as well as analyzed its causes according to the actual situations. Moreover, the optimization aiming at the existing problems in production run ensures the safe and stable trouble-free operations and productions of blower and blast furnace, which can be generalized and for reference.
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