鉄と鋼
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
99 巻, 12 号
選択された号の論文の5件中1~5を表示しています
製鋼
論文
  • 當房 博幸, 田 恵太, 桑山 道弘, 萩尾 勇樹, 薮田 和哉, 戸澤 宏一, 田中 敏宏, 森田 一樹, 松浦 宏行, 月橋 文孝
    2013 年 99 巻 12 号 p. 683-692
    発行日: 2013年
    公開日: 2013/11/30
    ジャーナル オープンアクセス HTML
    The COURSE50 project aims at developing technologies to reduce CO2 emissions from steel works by approximately 30% in Japan. In order to supply the energy required to separate CO2, a technology for recovering sensible heat from steelmaking slag is being developed as one theme of COURSE50. A twin roll type continuous slag solidification process to obtain a shape suitable for sensible heat recovery was investigated.
    Sheet-like slag was shaped to a thickness of about 7mm in a twin roll pilot-scale experiment. The slag thickness depended on the adhesion of the molten slag rather than the thickness of the solidified slag on the roll. The slag condition suitable for the twin roll method was identified as a liquid phase ratio of 60% or more. Based on a laboratory-scale experiment and heat transfer calculations, a combination process using the twin roll method and a countercurrent flow packed bed is expected to achieve a heat recovery ratio of 30% or more from sheet-like slag.
計測・制御・システム技術
論文
  • 小林 正宜, 柳 修介, 森本 禎夫, 石川 孝司
    2013 年 99 巻 12 号 p. 693-699
    発行日: 2013年
    公開日: 2013/11/30
    ジャーナル オープンアクセス HTML
    It is important to accomplish immediately a proper draft schedule setting method due to coping with the difficulty in rolling strips and the size jump of strips or covering the lack of experience of the younger operator in the hot strip mill. Therefore, a decision support system used when the operator selects the draft schedule has newly developed. This system has an excellent function that helps the operator to take the better each schedule from the past results of the draft schedule and the strip crown ratio schedule.
    After applying this system to the actual operation in the hot strip mill, the frequency has been increased in which the operator chooses the draft schedule and the strip crown ratio schedule with the edge wave tendency of the strip shape. In other words, the draft schedule and the strip crown ratio schedule with the center wave tendency of the strip shape gradually faded away. Consequently, the variation of these schedules has been converged into the smaller range than the period before the installation of this system.
    This system is now become essential to the operator in the hot strip mill, and contributes the trouble free rolling or the finishing of the strip thickness and crown.
表面処理・腐食
論文
  • 中野 博昭, 浦 高志, 大上 悟, 小林 繁夫
    2013 年 99 巻 12 号 p. 700-708
    発行日: 2013年
    公開日: 2013/11/30
    ジャーナル オープンアクセス HTML
    Zn electrodeposition was performed galvanostatically on a steel sheet at 1500 A/m2 in an agitated sulfate solution at 40°C to investigate the effect of preadsorption of organic additives on the lightness and morphology of Zn. The organic additives preadsorbed were classified into two types: 1) polyethylene glycol (PEG), gelatin and stearyl dimethyl benzyl ammonium chloride (SDBAC) (type I), which exhibit the polarization effect on Zn deposition ; 2) saccharin and sodium lauryl sulfate (type II), which exhibit no polarization effect on Zn deposition. The platelet crystals of deposited Zn became small by preadsorption of all kinds of organic additives. The decrease in size of platelet crystals of Zn with the preadsorption is attributed to both the increase in overpotential for Zn deposition and the decrease in epitaxial growth of Zn. The orientation of {0001} Zn basal plane decreased significantly because of an increase in overpotential for Zn deposition by the preadsorption of PEG and gelatin, and the orientation decreased slightly by saccharin and sodium lauryl sulfate in spite of no polarization effect on Zn deposition. The surface roughness of deposited Zn decreased by the preadsorption of organic additives with the exception of SDBAC. This is due to decrease in size of platelet crystals of Zn. The lightness of deposited Zn was increased by the preadsorption of organic additives with the exception of SDBAC. Because Zn deposited ununiformly by the preadsorption of SDBAC, the surface roughness of Zn increased and the lightness decreased.
  • 中野 博昭, 片岡 翔太, 大上 悟, 小林 繁夫
    2013 年 99 巻 12 号 p. 709-715
    発行日: 2013年
    公開日: 2013/11/30
    ジャーナル オープンアクセス HTML
    Zn-Ni composite electrodeposition was performed under coulostatic (515-5145C・m–2) and galvanostatic (5A・m–2) conditions on a brass with Ni precoating in an unagitated chloride solution at 23°C to investigate the color and structure of the deposited films. The chromaticity of deposited Zn-Ni composite films changed in a clockwise direction in each quadrant of a*b* diagram of La*b* color space with increasing the amount of charge. The deposited films contained S, Zn and Ni, and the content was in the order of S > Zn > Ni. XPS revealed that the deposited films were composed of ZnS, ZnO and Ni mainly and contained Zn(OH)2 and Zn slightly. The color of deposited films is attributed to interference of light, and the index of refraction of deposited films composed of ZnS, ZnO and Ni is assumed to be large. When the Ni was excluded from the electrolytic solution, ZnS did not codeposit and the deposition of Zn in metallic state increased. This suggests that the Ni deposition induces the codeposition of ZnS.
社会・環境
論文
feedback
Top