双相不锈钢中厚板在线酸洗工艺研究进展

在卧式连续喷淋酸洗机组上,利用原设备和H2SO4+(HNO_3+HF)酸洗液技术酸洗双相不锈钢中厚板,酸洗后表面出现浅灰色、下表面辊印缺陷。针对这些缺陷,以S32205双相不锈钢板为代表牌号,论述一种两段式混酸(HNO_3+HF)液酸洗方法,开展了两段式混酸(HNO_3+HF)液酸洗方法的实验室、工业化工艺试验和研究,并对原卧式喷淋酸洗生产线进行了技术改造。应用两段式混酸(HNO_3+HF)液工艺技术酸洗S32205钢板,在预先酸洗工艺段,混酸液HNO_3质量浓度为180g/L、HF质量浓度为90g/L,混酸液温度为43℃;在最终酸洗工艺段,混酸液HNO_3质量浓度为265g/L、HF质量浓度为56g/L,混酸液温度为43℃,一次酸洗合格率达到95%以上。从技术上解决了双相不锈钢中厚板酸洗后表面出现的浅灰色、下表面辊印缺陷,酸洗后的钢板表面呈银白色,色泽均匀,满足了双相不锈钢板产品标准关于表面质量的要求。     

不锈钢酸洗废混酸回收工艺

不锈钢冷轧带钢生产过程中要产生大量的废混酸(HF+HNO3)溶液。为了减少酸液损耗,需要进行混酸回收。本文主要对不锈钢酸洗废混酸回收技术进行介绍,分析了废酸的产生以及成分,阐述了混酸回收的原理及其工艺,并对两种混酸回收技术进行了综合分析对比。     

双相不锈钢热轧卷酸洗机理研究

采用电化学工作站及扫描电镜对双相不锈钢热轧试样H_2SO_4酸洗及进一步HNO_3+HF混酸酸洗过程表面电位变化、表面形貌变化及成分分析,阐述双相不锈钢热轧卷酸洗机理。     

不锈钢中厚板HNO3+HF混酸酸洗工艺研究

对不锈钢中厚板HNO3+HF混酸酸洗和常规H2SO4+(HNO3+HF)酸洗工艺进行了实验室的对比分析,并对HNO3+HF混酸酸洗工艺在生产过程中进行了小批量试验。结合实验室和大生产的试验情况,对两种酸洗工艺,从酸洗质量、效率、成本、环保、可适合钢种等方面进行了对比分析,提出了两种酸洗工艺的优缺点。     

奥氏体不锈钢中厚板连续喷淋酸洗工艺浅析

论述了奥氏体不锈钢中厚板连续喷淋酸洗工艺的技术特征,并对典型的卧式、立式连续喷淋酸洗机组设备组成和生产工艺加以分析和对比。介绍了连续喷淋酸洗技术在国内不锈钢中厚板生产厂的实际应用情况。     

浅析奥氏体不锈钢中厚板生产中的连续喷淋酸洗工艺

本文在简要介绍奥氏体不锈钢酸洗钝化机理的基础上,重点论述了连续喷淋酸洗工艺的技术特征,并对典型的卧式、立式连续喷淋酸洗机组设备组成和生产工艺进行了分析和对比。最后,对连续喷淋酸洗技术其在国内不锈钢中厚板生产厂的实际应用情况进行了简单回顾。     

1Cr18Ni9Ti 不锈钢酸洗白化工艺研究

本文在通过对传统的三酸(HCl+HNO_3+H_2SO_4)或两酸(HF+HNO_3)混合酸溶液及近年来开始采用的“碱煮+酸洗”等酸洗白化工艺的劳动条件、质量设备、操作等方面的综合考虑分析后,采用正交试验方法,经过试验室研究和生产性试验,表明应用“HCl+HNO_3”的两酸混合液对1Cr18Ni9Ti 不锈钢进行酸洗白化,具有质量好、速度快、工序省、操作简便等优点,并且可以收到酸洗和白化同槽一次成功的效果。     

浦钢不锈钢宽厚板酸洗工艺研究和技术改造

研究不锈钢宽厚板连续喷淋酸洗工艺线中酸循环运行系统技术参数及关键技术参数与不锈钢酸洗产量和质量的关系 ,按钢板 1 .2m/min的运行处理速度 ,研究循环酸液纯净的处理方式。根据研究结果 ,提出喷淋酸洗线的技术改造方案 ,目标使不锈钢酸洗产能在现有基础上持续、稳定地增加 5 0 %～ 60 %。     

热轧400系不锈钢中厚板连续酸洗线成功酸洗

单张热轧400系不锈钢中厚板热轧后,需要经过热处理退火降低其硬度和改善组织,退火以后表面产生大量的氧化皮量,经过机械破鳞(抛丸)去除表面的大部分氧化铁皮,然后再经过酸洗将其表面剩余氧化皮去除,并使表面生成一层钝化膜。热处理退火过程中表面产生的氧化铁皮成分复杂,通过表面氧化铁皮成分的研究,在实验室配置不同浓度的酸液进行了酸洗试验,根据试验的浸泡时间转换成连续线的辊道速度,最终确定了连续酸洗线的酸洗方式以及硫酸浓度、硝酸浓度的配置,在硫酸段、混酸段的酸液温度控制以及辊道速度的调整;重点对连续酸洗线工艺酸洗机理、生产工艺质量过程控制、生产实践总结等几个方面进行了简要的介绍和分析。     

焊接用双相不锈钢ER2209线材的生产实践

通过对焊接用双相不锈钢ER2209线材生产实践过程中的冶炼、轧制、固溶及酸洗工艺的研究,结果表明：最佳的热加工温度为1000～1050℃,可有效避免σ相析出导致的轧制开裂;热处理温度为1050～1100℃,材料的强度较低,塑性较高,冷拉拔性能优异;采用(H₂SO₄+HF)溶液预处理及(HNO₃+HF)混酸洗的工艺进行酸洗,线材表面质量优异,无酸洗晶间腐蚀。     

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)     

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.