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11.
CVC mills are generally used in the whole stands of CSP (Compact Strip Product). Their special “s” curve of work roll contour and shifting strategy aimed at controlling strip shape, and the characteristics of continuous casting and rolling production, which make the work roll wear in downstream stands seriously uneven, and easily form abnormal transverse profile at the rolling end. As a result, CVC mill configuration in the downstream stands can not meet the profile and flatness control requirement for schedule free rolling, and bring some difficulties in profile and flatness control for the subsequent cold rolling. Based on the characteristics of the shape control system of CSP production line, and combined with the theory of flat roll technology, a kind of technology solution of using flat roll in the downsteam stands for CSP hot strip mills was proposed. At last, industrial test was carried out in the last stand of Masteel CSP, and good results were obtained. 相似文献
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《钢铁研究学报(英文版)》2011,(Z2):263-267
Original scheme and optimizing scheme of WISCO CSP tundish have been simulated by software FLUENT. Flow field and temperature field of different schemes have been analyzed. The results which have been proved by hydraulic model experiments are the same with that of numerical simulation. It shows that the dead volume Vd of optimizing scheme decreases to 11.37%, reduced by 67.8% compared with the original scheme. The average residence time Ta of optimizing scheme increases to 639.2s, increased by 172.5s compared with the original scheme. The optimized scheme favors homogenous temperature distribution, more reasonable flow field and inclusions removing in the tundish. It is more adaptive to CSP plant of WISCO compared with the original scheme. 相似文献
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为了选择合适的模型来模拟CSP工艺轧制低碳锰钢的组织变化,首先采用Jonas、Sellars、Saito、Yada等人开发的模型进行模拟,然后采用轧卡试验进行了工业试验验证.轧卡试验和计算结果表明:Jonas模型预测的晶粒尺寸在第一道次较实测值偏小,而在最后几道次较实测值偏大;Yada模型预测值较实测值偏小;Sella... 相似文献
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采用包钢CSP(Compact Strip Production)薄板坯连铸连轧工艺生产L245钢为原料进行螺旋焊管焊接生产,针对生产中焊缝裂纹问题对焊缝区的形貌、组织进行了观察,并对焊缝进行拉伸性能和X射线检验。分析表明,母材与热影响区的交界处(即偏向热影响区的“过渡区”)是L245焊管力学性能最脆弱处,珠光体的形貌是影响其拉伸性能的关键因素。 相似文献
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Xinping Mao Xiangdong Huo Xinjun Sun Yizhong Chai 《Journal of Materials Processing Technology》2010,210(12):1660-1666
A new hot rolled titanium-microalloyed steel with yield strength of 700 MPa has been developed by CSP (compact strip production) process based on commercial weather resistant steel. EBSD results showed that the average size of its grains with high angle boundaries (>15°) was 3.3 μm. High-density dislocations and large number of nanometer particles were observed in the steel product by TEM. X-ray analysis on the electrolytically extracted phase from the steel indicated that fraction of MX phase was 0.0793 wt%, in which the particles smaller than 10 nm accounted for 33.7%. The contribution of precipitation hardening resulting from nanometer particles was calculated as approximate 158 MPa. The commercial weather resistant steel, reference steel for comparison with 450 MPa yield strength, was also prepared and investigated. It can be concluded that grain refinement is still a major strengthening mechanism in this high strength steel, but precipitation hardening of nanometer TiC precipitates is the dominant factor to increasing the yield strength in new developed steel compared with the reference steel. 相似文献
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Selecting a site that meets the technical requirements for a concentrating solar power plant (CSP) is a very critical exercise. This paper points out crucial factors and provides guidelines regarding the selection of suitable sites. It especially focuses on Sahelian countries which have their own climatic peculiarities. These countries, characterized by low access to electricity, are well endowed in solar resources. They are potentially good locations for concentrating solar power plants since their mean daily solar radiation exceeds 5.5 kWh/m2. CSP presents therefore, a good opportunity for them to increase in a sustainable manner, their energy supply. The guidelines developed in this paper are applied to Burkina Faso as a case study. 相似文献
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J. Rives Childs 《Cryptologia》2013,37(3):201-214
Abstract In this article, we consider an attack on the SIGABA cipher under the assumption that the largest practical keyspace is used. The attack highlights various strengths and weaknesses of SIGABA and provides insight into the inherent level of security provided by the cipher. 相似文献