Engineering method of calculating an efficient length for the vertical section of a continuous caster on which the semifinished product is bent and straightened

An engineering method has been developed to calculate an efficient length for the vertical section of continuous casters on which the semifinished product undergoes bending and straightening. The method, recommended for use by designers, was developed by analyzing the ratio of the volumes of the melt in which nonmetallic inclusions do and do not rise to the melt’s surface. The method makes it possible to quantitatively analyze the efficiency of the top section of the channel proposed for new casters to alleviate the effects of nonmetallic inclusions. The efficiency of this section is evaluated in relation to its geometry, the base radius of the caster, the thickness of the continuous-cast semifinished product, and casting speed. __________ Translated from Metallurg, No. 6, pp. 51–53, June, 2006.     

Combination processes for the continuous casting and rolling of flat semifinished products

Metallurgy Abroad

Combination processes for the continuous casting and rolling of flat semifinished products     

A technique for obtaining shock-wave parameters using wave superposition in low-carbon steel

A novel experimental set-up for obtaining shock-wave superposition is described. Detonation is simultaneously initiated at the two opposite sides of an explosive layer placed directly in contact with a steel block. It was possible to take advantage of thea (bcc) → ε (hcp) →α (bcc) transformation occurring in iron at approximately 13 GPa in a unique fashion. The pressure of the two converging pulses is approximately 13 GPa, resulting in little or no transformation. However, in the region of superposition of the two waves the pressure is much higher.Post explosionem observation of the microstructure allowed an easy identification of the region of superposition, because of the profuse transformation “debris”. Events conducted for three thicknesses of the explosive layers allowed conclusions to be drawn about the changes of rarefaction and attenuation rates. The interactions occurring between the waves due to simultaneous superposition and transformation are thought to be responsible for internal spalling. Formerly with the Department of Metallurgical Engineering, South Dakota School of Mines and Technology     

小扁坯钢水转炉区域控制情况

针对4#小扁坯铸机不配精炼炉的实际情况,制定相应的钢水脱氧制度、温度制度以及时序的控制和用包制度.保证了4#小扁坯铸机的生产顺行.     

Mastering a technology for the continuous casting of steel on section casters at the Chelyabinsk Metallurgical Combine

The Chelyabinsk Metallugical Combine has successfully introduced a technology for the continuous casting of converter steel into 100 × 100 and 180 × 180 mm semifinished products. Introduction of the technology required the resolution of several technical problems. Studies were made of the causes of breakouts occurring during the casting of low-carbon steel semifinished products. The reasons that semifinished products made of medium-carbon steels acquire a rhombic shape were also examined.     

洪格尔密封技术在连铸机上的应用

本文介绍了德国洪格尔组合密封的结构、特点和在连铸机液压剪上的应用，取得了良好的效果。     

Production technology for low-carbon,low-sulfur boron steel

A technology for slag formation in the ladle–furnace unit is considered; the slag is based on the CaO–SiO₂–MgO–Al₂O₃–B₂O₃ system. This technology permits both microalloying of the steel with boron (reduced from the oxide phase) and desulfurization of the steel. The resulting boron content in the steel is 0.001–0.008%; the sulfur content in low-alloy steel and pipe steel is low (0.004–0.010%); and the consumption of manganese ferroalloys is reduced to 0.5 kg/t for 08кп steel and 1.4 kg/t for 09Г2C steel. In addition, the proposed technology increases the strength of the rolled steel, without loss in its plasticity; and reduces the environmental impact thanks to the replacement of fluorspar by colemanite.     

小方坯连铸低碳低硅铝镇静钢可浇性

在分析水口堵塞的基础上,结合马钢三炼钢生产实际,采用正交实验法研究了钙处理的喂线速度、喂线量和中间包水口内径对140mm×140mm小方坯连铸低碳低硅高酸溶铝钢水口堵塞的影响.结果表明,提高喂线速度、加大喂线量和增加水口内径可避免水口的堵塞.采用以上工艺,连浇炉数达8~10炉,且铸坯内部和表面质量良好.     

An asymptotic model of the mold region in a continuous steel caster

A model is developed to simulate the solidification of the steel shell in the mold region of the continuous casting process. Conduction-dominated temperature fields in the mold, mold flux, steel shell, and molten steel regions are determined through the development of an evolution equation for the solidifying front. This equation is derived in the limit of small aspect ratio, mold width to height, using asymptotic methods. These results are coupled with a lubrication-theory model for the mold flux region. This model assumes a temperature-dependent viscosity for the mold flux and allows for solidification of the flux at temperatures below a critical value. System response to changing casting speeds, superheat, mold wall temperatures, and mold flux properties is investigated.