可逆式炉卷轧机——生产厚板的新型设备

美国达涅利Wean联合公司在中等厚度板坯铸轧技术基础上，开发出一种新型炉卷轧机。该轧机既能生产钢板又能生产钢卷，来料厚度150mm，成品最大宽度可达3．0—3．5m，年产量100—130万t。生产钢卷时采用2个卷取炉和1个地下卷取机进行卷取；生产厚板时，炉卷轧机同可逆式普通轧机，不需卷取；     

珠钢邯钢CSP生产线顺利试产

广州珠江钢铁公司引进的薄板坯连铸连轧生产线 ,试产不到半年 ,于 2 0 0 0年 2月中旬轧出 1 .0 8mm厚的热轧板卷(设计 1 .2 mm)。其宽度为 1 0 2 0 mm,卷重 7.56t,成为我国目前热轧宽带钢最薄的钢板卷生产企业。邯郸钢铁公司 CSP生产线自 1 999年 1 2月成功轧出第一卷重 7.8t、厚 7mm、宽 1 2 2 5mm的热轧带卷以来 ,试产计划正稳步推进。 2 0 0 0年 2月首次实现 6炉钢水连铸连轧 ,带卷宽度首次达到设计的最大宽度 1 680 mm。 2 0 0 0年 3月 ,成功地轧出 4～ 2 .3mm厚的带卷 1 40卷 ,2 2 58t,创出试产以来日产量、薄规格数量、合格率指标的…     

伯利恒公司新建的酸洗—冷轧联合机组

伯利恒钢铁公司 1998年起在耗资 3亿美元在雀点厂新建设一套酸洗—冷轧联合机组。该机组共有 5个机架 ,设计能力为酸洗 15 4万 t,冷轧能力限定在约 136万 t,雇员人数约 30 0人。新机组将主要用于生产建筑及家电用钢。在建筑用钢板方面雀点厂有着丰富的经验。产品规格是 0 .2 5～ 2 .5 4mm。所生产的中等厚板及薄带将用于预涂漆的天花板和建筑侧墙、曝露的轻型固定件和金属家具。原料的热轧带卷最大重量为 30 t。厚度范围 1.6 5～ 5 .0mm,宽度 5 6 0～ 15 75 mm。采用的工艺是 :张力矫直 /除鳞→酸洗→边部修整 (热轧酸洗板在此步骤后打捆交…     

新型连铸轧钢设备

为满足以更低的成本生产热轧带钢的要求,美国1家公司开发出1种新型的、适用于小规模厂家的小型轧钢设备。该设备包括1台10 0mm厚板坯连铸机和1台单机架炉卷轧机,可以生产其他薄板坯连铸法难以生产的多种产品。这种轧钢设备年产量为4 0～12 0万t,成品带钢厚度在1.5～2mm之间。由于采用了中等厚度的板坯连铸( 10 0mm) ,所以带钢宽度可以达到2 .4m ,大大超过了薄板坯连铸机的宽度限制。该设备适合生产碳钢、不锈钢、高强度低合金钢和深冲钢等新型连铸轧钢设备     

唐钢超薄热带项目全线试车成功

1月29日,唐山钢铁公司调整产品结构的主体项目——唐钢超薄热轧带钢生产线热负荷试车成功,诞生了唐钢历史上第一卷合格钢板,标志着唐钢历时5年的“三步走”发展规划圆满实现。 该工程总概算投资25亿元,一期工程年设计产量为150万t,产品厚度0.8～4 mm、宽度850～1 680 mm。产品定位为建筑、包装、家电和汽车行业。     

世界第一台生产碳钢和不锈钢的带钢连铸机

纽柯公司正在克劳福兹维尔厂建设世界第一台商业规模的带钢连铸机,计划于2002年末投产。连铸为双辊铸机,采用直径500mm反向旋转的水冷铜辊;炉容量110t;带钢厚度0.7～2.1mm;带钢宽度初期1345mm,之后2000mm;钢卷重量25t;在线轧机为单架四辊热轧机;两台40t卷取机;热轧机最大压缩50％;产品为低碳和400系列不锈钢;年产量30～75万t。     

蒂森克虏伯尼罗斯塔公司新的冷轧机

蒂森克虏伯的尼罗斯塔公司是世界上最大的不锈钢板材生产厂之一，于2004年7月2日为新的冷轧机举行了投产仪式。项目总投资3000万欧元。新的冷轧机每年将向新的退火酸洗线提供大约110万t冷轧带钢。这套20辊轧机可以轧制的带钢最大宽度为1350mm，带钢厚度为0．2～2．5mm。最大轧制速度为800m／min，钢卷单重量大30t。     

蒂森克虏伯尼洛斯塔公司新的冷轧机

蒂森克虏伯的尼洛斯塔公司是世界上最大的不锈钢板材生产厂之一，于2004年7月2日为新的冷轧机举行了投产仪式。这个3000万欧元的轧机投资完成后，结束了该公司在德国克里菲尔德厂冷轧带钢技术方面17000万欧元的投资计划。新的冷轧机每年将向新的退火酸洗线提供大约110万t冷轧带钢。这套20辊轧机可以轧制的带钢最大宽度为1350mm，带钢厚度为0．2～2．5mm。最大轧制速度为800m／min，钢卷单重最大30t。     

10t炼钢电炉炉盖的改进

1.存在的问题及改进方法 我公司10t全液压炼钢电炉,采用整体水冷炉盖。炉盖重达3650kg,其最大直径为φ3700mm,最大高度为730mm,由厚度为12～16mm的A3钢板和锅炉钢板焊接制成。炉盖中间等距离三个电极孔的最大偏差≤±5mm,试验水压0。6MPa(6kgf/cm~2)。 在炼钢生产中发现,炉盖电极孔侧壁或下部焊缝经常漏水,必须对其进行维修,从而增加了热停时间,直接影响了生产。 为解决此弊,我们对原炉盖先后进行了5次改进。利用废旧炉盖,将其受热严重、     

舞阳钢铁有限责任公司

1　概况舞阳钢铁有限责任公司始建于 1 970年 ,经一、二期工程建设与改造 ,现已发展成为国内最大的宽厚板生产和科研基地。现有固定资产 35亿元 ,职工 1 1 0 0 0人 ,各类工程技术人员 2 640人。2 0 0 2年产钢 90万t、钢板 78万t,实现销售收入 30亿元 ,利税 1 4亿元。2　主要工艺流程及装备生产工艺流程 :电弧炉冶炼→LF精炼→VD真空处理→连铸 (模铸 )→坯 (锭 )清理→加热→42 0 0mm轧机轧制→ACC控制冷却→ (超声波探伤 )→ (热处理 )→精整→入库。主要装备 :90t超高功率电弧炉 1座、LF 2座、VD炉 1座、30 0mm× 1 90 0mm板坯连铸…     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.