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进入90年代中期以来,全球钢铁工业发展的主要特征之一,是国际性及地区性大型钢铁骨干企业结构重组进展迅速,开始了一系列的企业兼并与合并。兼并的对象既有大型钢铁联合企业,也有小型、特别是专业化程度高的钢厂;或者是两大钢铁企业之间的合并或建立“战略同盟”。其目的在于扩大产量、占领市场。开发技术。拓宽产品范围,一句话,增强企业在国际市场的竞争力。钢铁企业的合并重组愈演愈烈国际钢铁协会公布的1999年世界钢铁企业排行榜,再一次反映出全球钢铁工业兼并。联合的发展趋势。位居世界大型钢铁企业排行榜第1位的仍是韩国浦项… 相似文献
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钢铁工业是现代化国家的重要基础产业和国民经济的支柱产业。从世界钢铁工业发展看:全球化趋势愈来愈明显,联合重组趋势更加突出。为了最有效利用资源与市场、提高企业竞争力,世界钢铁工业的改造、联盟、兼并重组步伐在加快,中国钢铁工业也将顺应世界钢铁工业发展潮流。国家“十一五”规划提出,到“十一五”末中国将诞生2000万-3000万吨的钢铁企业。 相似文献
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考察80年代中期以来美国一些钢铁联合企业与外国(主要是日本)携手建立合资企业的动因与效果。这种合作既可融入外国资金,又使美国企业技术与管理水平得以提高,还为钢铁工业的下游行业提供高质量钢铁产品。我国也可借鉴国际合作战略,以利于建立较大规模的合资企业。生产高档钢材并推动钢铁工业的加速发展。 相似文献
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我国虽是世界第一产钢大国,但与钢铁强国之间,无论在产品结构上、装备水平上、吨钢综合能耗上差距甚在。因此,我国钢铁工业面临的选择;只有积极进行钢铁产品结构的调整;钢铁企业进行兼并,淘汰一批,改造一批,增强企业实力;无论是老企业改造,还是新厂建设都应积极采用起点高,技术含量高的新工艺、新技术、新装备,而且应使工艺流程先进。 相似文献
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国外钢铁企业兼并合作及其启示 总被引:2,自引:0,他引:2
一百多年来全球十大钢厂排行榜的演变,反映出了全球钢铁工业兼并、联合的发展趋势。全球十大钢厂的演变,可分为3个历程:第一阶段,美国钢厂独领风骚。二十世纪初美国历史上的第一次“收购和兼并”浪潮,造就了世界第一钢厂———美国钢铁公司。起步较早的美国钢铁业使钢铁盛世绵延了70年,期间,美国钢厂不仅独霸全球前三位,且十大钢厂中占有六席。第二阶段,1970年起日本钢厂异军突起。1970年日本新日铁通过合并重组,首度跃居世界头号大钢厂,正式宣告日本钢铁业黄金时代来临,最高峰时,曾有新日铁、川崎、住友等钢厂跻身十强榜内。第三阶段,90年… 相似文献
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一、我国企业兼并重组的现实意义1.从国际上看,新一轮企业兼并重组热潮的出现是企业在全球经济结构和产业结构急剧变化的新形势下实施的一项战略行动近年来,国际上掀起新一轮企业集团兼并重组的热潮。据美国证券资讯公司对10个主要国家1997年企业并购所作的调查显示,1997年 相似文献
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《Acta Metallurgica Materialia》1991,39(2):209-219
Uniaxial consolidation experiments have been conducted at room temperature for two deformable metal powders (1100 Al and Pb5%Sb) containing various amounts of spherical steel inclusions. The experiments illustrate that the inclusion phase offers little constraint to matrix deformation at volume fractions <0.20, but produces a rapidly increasing constraint at larger volume fractions. Two constraining mechanisms have been identified through microstructural observations: (1) the matrix must be deformed more within the composite because of the excluded volume associated with the packing of particles and inclusions of different sizes, and (2) the inclusions form a continuous touching network (predicted with site percolation theory and direct observations of deformation flats on the steel spheres) which supports a portion of the applied stress and thus, partially “shields” the deformable phase from the total applied consolidation pressure. An analysis is presented to separate the contributions of each mechanism and shows that both mechanisms contribute comparable amounts to the constraint of matrix consolidation. It is suggested that because the inclusion network supports a significant portion of the applied pressure and releases its elastic strain in a non-linear manner (as described by Hertzian theory), the matrix is placed in tension when the applied pressure is released after consolidation. 相似文献
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AbstractThe technology of hot isostatic pressing (HIP) has been used for the consolidation of metal and ceramic powders for many years. About 25% of the entire HIP capacity in industry can be assigned to the production of PM products, more than 50% relating to the densification of cast and sintered components. Within the PM related activities, semi-finished tool steel products and near net shape (NNS) components have the biggest market shares and the highest growth rates. 相似文献
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研制出三种过滤器材质配方,此三种材质具有很好的化学稳定性、热震稳定性和常温、高温强度;设计制造出生产试验用过滤器。经生产试用可成功地过滤13.3t 铝镇静钢,能有效地降低钢锭中的非金属夹杂物。 相似文献
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A. Belyakov Y. Sakai T. Hara Y. Kimura K. Tsuzaki 《Metallurgical and Materials Transactions A》2002,33(10):3241-3248
The structural changes in an Fe-0.6 pct O alloy during mechanical milling followed by consolidation through rolling were studied.
The iron-iron oxide powders were mechanically milled in an argon atmosphere for various times from 20 to 300 hours. The powders
were then canned into a steel pipe and multiple rolled at 700 °C for consolidation. The microstructure of the final product
depended significantly on the milling time. The volume fraction of the dispersed oxides (10 nm in diameter) increased from
about 0.3 to 2.5 pct when the milling time was increased from 20 to 300 hours. The relatively short milling time of 20 hours
resulted in the evolution of elongated grains (an average size of about 1.2 μm) with a large fraction of low-angle grain boundaries after consolidation. In contrast, much finer grains (about 0.2 μm in size) with a near random grain-boundary misorientation distribution evolved in the samples milled for 300 hours. 相似文献
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通过对PC钢棒的生产工艺分析与研究,合理设计其牌号,找到控制PC钢棒产品实物质量的主要因素,开辟了含As铁水冶炼PC钢棒钢的范例. 相似文献
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Vogel Edward K.; Woodman Geoffrey F.; Luck Steven J. 《Canadian Metallurgical Quarterly》2006,32(6):1436
How long does it take to form a durable representation in visual working memory? Several theorists have proposed that this consolidation process is very slow. Here, we measured the time course of consolidation. Observers performed a change-detection task for colored squares, and shortly after the presentation of the first array, pattern masks were presented at the locations of each of the colored squares to disrupt representations that had not yet been consolidated. Performance on the memory task was impaired when the delay between the colored squares and the masks was short, and this effect became larger when the number of colored squares was increased. The rate of consolidation was approximately 50 ms per item, which is considerably faster than previous proposals. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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Where faulting takes place due to the absence of dowel bars and inadequate subbase support in jointed concrete pavement (JCP), dowel bar retrofit (DBR) is used to improve load transfer efficiency (LTE) and to prevent further faulting of slabs at transverse joints. Even though DBR generally improves LTEs and overall performance of JCPs, not all DBR projects have been successful. Faulting reoccurred within 2?years after DBR treatment on US59 in Texas. An investigation from the cores taken in the project revealed excessive voids under a dowel bar due to poor consolidation of the grouting material. A laboratory investigation was performed to determine the most critical factors for adequate consolidation of grouting materials in DBR. Typical rapid-setting grout materials widely used in DBR were selected and full-scale specimens were made for evaluations. Four testing variables for consolidation performance were investigated: time of placement after mixing, vibration time, slot width, and maximum aggregate size. Maximum aggregate size and slot width were not critical factors for consolidation performance of grout. The most significant factor was vibration time. Twenty s of vibration is recommended. Placement time was also an important factor, with grout materials placed after initial set performing poorly. Delayed placement of grout materials without vibration led to the most voids under the dowel bars. 相似文献
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纯净钢及其生产工艺的发展 总被引:21,自引:0,他引:21
分析了杂质在钢中的行为和引发的钢材缺陷,总结了纯净度对钢材力学性能和使用性能的影响。根据对脱磷工艺的控制,提出了两种纯净钢生产工艺:(1)铁水“三脱”纯净钢生产工艺;(2)钢水精炼纯净钢生产工艺。通过技术比较,铁水“三脱”工艺生产效率高,过程温度损失小,辅畏料和耐火材料消耗低,流程简单,控制容易,冶炼周期短,可用时生产直低P、N钢种,适合转炉工厂采用。 相似文献
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先以布袋灰、电炉灰、焦粉、水泥制成冷固结球团,进行高温自还原试验。再以纯水泥试样进行差热试验。最后以纯试剂四氧化三铁和石墨粉,配加纯氧化铝粉末并且不添加粘结剂制成的冷固结球团进行自还原试验。通过检测其抗压强度、扫描电子显微镜-能谱分析等方法分析了粉尘冷固结球团高温复合粘接机理,研究表明:低温下粉尘冷固结球团的强度主要靠水泥粘结相保证,随着温度升高,水泥逐渐失效,在1 000℃后金属铁连晶开始生成,并成为主要粘结相,未熔固态成渣物质对金属铁连晶的形成具有负面的影响,当其含量超过15%时就会对金属体连晶的形成产生显著的影响。 相似文献