新一代高性能合金弹簧钢的开发与应用

通过高合金钢棒线材连轧机的控制轧制工艺研究了新一代合金弹簧钢D701的力学性能。研究表明，将控轧工艺的终轧温度控制在790～820℃，细化了晶粒，合金弹簧钢D701的强度、塑性指标较60Si2CrVA有了很大提高，尤其是塑性提高30％以上。     

新钢热连轧厂X70管线钢生产试验研究

介绍了新余钢铁公司1580热连轧厂管线钢的生产试验情况。通过合理的化学成分设计及控轧控冷,成功地开发了X70管线钢。试验结果表明,加热温度控制在1 200～1 250℃,终轧温度控制在820～860℃,卷取温度控制在550～580℃,可获得细小的针状铁素体组织,各项力学性能指标均符合标准要求。     

连轧GCr15轴承钢的控轧控冷工艺

大冶特钢用 6 5 0连轧机组 KOCKS轧机 DSC控轧控冷系统生产Φ12～ 72mmGCr15轴承钢 ,DSC水冷控制系统允许来料温差 5 0℃ ,终轧温度控制精度± 10℃。由Φ32mm、Φ4 5mm和Φ4 8mm 3个规格GCr15轴承钢的生产结果表明 ,当钢棒终轧温度控制在 74 0～ 82 0℃ ,轧后快冷至 72 0～ 780℃ ,GCr15轴承钢的网状碳化物≤ 2 .5级 ,组织均匀细小。最佳终轧温度为 74 0～ 75 0℃。     

屈服强度180MPa热镀锌烘烤硬化钢及其生产方法

专利号：CN200910061289．7专利权人：武汉钢铁（集团）公司本发明涉及汽车用钢。其解决现有技术中微量合金元素添加的较多、成本高、性价比低等不足。措施：屈服强度180MPa热镀锌烘烤硬化钢,其化学组分及质量分数为：C：0．001％～0．008％、Si：0．045％-0．055％、Mn：0．10oA～0．40％、P：0．01％～0．03％、Nb：0．005％～0．020％、050--1100℃条件下粗轧;精轧的终轧温度控制在900-960℃;在700-760℃     

新型细晶强化中厚板Q460的控轧控冷工艺研究

通过热轧试验,对比研究了终轧温度及轧后冷却速度对综合力学性能的影响,研究发现：降低终轧温度可以提高钢的屈服强度和抗拉强度,对韧性的影响不大,其强度的提高主要以沉淀强化为主;冷却速度越快,铁素体晶粒越细,钢的强度和韧性越高。但冷速超过15℃／s时会发生贝氏体相变,考虑到钢的综合性能,湘钢Q460热轧时应将终轧温度控制在840℃-860℃之间,冷却速度控制在10～15℃／s为最佳。     

含钒复合,轧辊试用的探讨

1.概述采用辊温高达460℃～530℃的热辊进行迭轧薄板的轧机,为了防止迭板产生粘结,其轧制温度控制在奥氏体加铁素体显微组织区域内,一般在760～880℃。即开轧温度仅相当于热轧型钢的终轧温度,它的终轧温度又低于钢的再结晶温度。其变形特点介乎热     

温度制度对齿轮钢带状组织的影响

结合20CrMnTiH钢生产过程中实际的温度控制情况,分析了轧制工艺对带状组织的影响。综合考虑组织与性能,不宜采用高的加热温度来控制带状组织;最佳的终轧温度应该在950～1000℃;轧后冷却速度的增加,带状组织级别减小。莱钢通过降低加热温度、控制终轧温度及轧后冷却速度等措施,将20CrMnTiH带状组织控制在2.0级以下。     

采用铌钒复合微合金化技术生产HRB400螺纹钢

为了降低HRB400螺纹钢的冶炼成本,对其进行了微合金化成分设计。根据唐钢生产实际,分析了C、N、V、Nb四种元素的相互作用,制订了适宜的合金成分,进行了三次试生产。结果表明:冶炼时,氮化钒铁加入量在0.41 kg/t左右,铌铁加入量0.16 kg/t左右时,钒铌微合金化HRB400螺纹钢各项性能指标满足国家标准要求;轧制加热炉均热段温度控制在1 150℃-1 195℃,开轧温度控制在1 025℃-1 080℃可以有效地抑制钢中贝氏体形成。     

加热炉上料翻钢节能改造

充分结合现场空间,设计增加上料翻钢系统,实现钢坯平放装炉。实践表明,粗轧的轧制电流同比下降10%～15%,平装温度控制比竖装温度低10～15℃,降低煤气消耗4%,取得良好的效果。     

轧后快速水冷工艺参数对钢筋性能的影响

以棒材末架轧机后的快速冷却装置为研究对象,试验和分析了轧后快速水冷过程的主要工艺参数对钢筋性能的影响。结果表明,缩短终轧至始冷的时间间隔可提高钢筋强度,增加冷却水量、冷却时间或冷却水压可提高钢筋强度,但会降低延伸率。降低自回火温度可提高钢筋强度,但会降低延伸率。经试验研究,在国外某棒材生产线采用Q235钢种,?18 mm钢筋自回火温度控制在570~630℃,?22 mm钢筋自回火温度控制在550~650℃,?25mm钢筋自回火温度控制在460~520℃,均可得到满足该国标准要求的钢筋。     

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。     

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.     

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)     

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.     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.