冷热坯混装的方坯加热炉技术改造方案

为将原方坯加热炉的能力从 70t/h提高到 15 0t/h ,对其进行了高效蓄热式改造 ,并采用高、低温 2座加热炉的方案成功地解决了冷热坯混装的问题 ,效果很好 ,并可增加经济效益 6 37万元 /a。

中厚板加热效率提升技术研究

在充分考虑冷热坯分置、上料过程互不干涉、存储时间与加热时间有别等原则基础上,从冷热坯分装的库区及炉区工艺布局及装出炉技术入手,探讨中厚板加热效率提升的解决方案。

Characteristics evolution of 6009/7050 bimetal slab prepared by direct-chill casting process

6009/7050 alloy bimetal slab was prepared by a direct-chill (DC) casting process. Homogenizing annealing, hot rolling and T6 treatment were successively performed and their effects on microstructure and properties of the slab were studied. The results reveal that the average diffusion layer thickness of as-cast slab, determined by interdiffusion of elements Zn, Cu, Mg and Si, was about 400 μm. Excellent metallurgical bonding was achieved because all tensile samples fractured on the softer 6009 alloy side after homogenizing annealing. After homogenizing annealing plus rolling, the average diffusion layer thickness decreased to 100 μm, while the network structure of 7050 alloy side transformed to dispersive nubby structure. Furthermore, subsequent T6 treatment resulted in diffusion layer thickness up to 200 μm and an obvious increase of the Vickers hardness for both 7050 and 6009 sides. The layered structure of the as-cast 6009/7050 bimetal is retained after hot rolling and T6 treatment.

Effect of cooling structure on thermal behavior of copper plates of slab continuous casting mold

A three-dimensional finite-element model of slab continuous casting mold was conducted to clarify the effect of cooling structure on thermal behavior of copper plates. The results show that temperature distribution of hot surface is mainly governed by cooling structure and heat-transfer conditions. For hot surface centricity, maximum surface temperature promotions are 30 ℃and 15 ℃ with thickness increments of copper plates of 5 mm and nickel layers of 1 ram, respectively. The surface temperature without nickel layers is depressed by 10 ℃ when the depth increment of water slots is 2 mm and that with nickel layers adjacent to and away from mold outlet is depressed by 7℃ and 5 ℃, respectively. The specific trend of temperature distribution of transverse sections of copper plates is nearly free of cooling structure, but temperature is changed and its law is similar to the corresponding surface temperature.

小型棒线材生产连铸-轧钢工艺衔接优化

通过对国内多个小型棒线材企业连铸-轧钢工艺衔接实际生产情况的调研及分析,剖析了小型棒线材连铸-轧钢工艺衔接现状及普遍存在的问题,提出了通过改进生产组织模式、在连铸和轧线加热炉之间增设保温缓冲台架、热坯收集台架、低温坯剔除台架及保温坑等设施的优化方案,可使热送热装比提高到90%以上,加热炉实行冷热坯分装,经济效益明显。