浦项低温板坯加热生产高磁感取向电磁钢板的方法

1　发明要点公开了一种生产用作变压器铁芯等具有高磁感取向电磁板的方法。在此方法中 ,抑制初次再结晶晶粒长大的抑制剂是在冷轧至成品板厚后形成 ,使低温加热板坯成为可能。主要工艺是 :硅钢板坯加热 ,热轧板退火 ,一次冷轧 ,脱碳退火 ,涂布退火隔离剂 ,最终高温退火。板坯加热温度为 10 5 0～ 1 2 5 0℃ ,脱碳退火在露点为 30～ 70℃的含氮保护气氛中进行 ,脱碳退火温度为 85 0～ 95 0℃ ,时间是 30s～ 1 0min ,脱碳之后紧接着进行氮化。板坯的成分为 ,w(C) :0 .0 2 % ～ 0 .0 4 5 %、w(Si) :2 .90 % ～ 3.30 %、w(Mn) :0 .0 5 % ～ 0 …     

0.23mm厚度高磁感取向硅钢片生产中的技术改进

0．23mm厚度高磁感取向硅钢片生产中存在的问题有：板坯加热温度太高，热轧板偏厚，边裂太多，需要多次常化、冷轧，表面质量不稳定。采取的措施是：研制低温板坯加热用钢，在钢中添加Cr，减薄热轧板的厚度，调整热轧、冷轧工艺，在MgO中添加适宜的添加剂，优化酸洗工艺等。     

取向硅钢板坯加热温度对热轧及冷轧板织构的影响

 采用取向分布函数及取向线分析方法对取向硅钢高温和低温板坯加热工艺的热轧及冷轧钢板织构进行了研究。结果表明：低温与高温板坯加热工艺的热轧板及冷轧板织构组分有明显不同。低温板坯加热热轧板中{100}<001>及{110}<110>织构较强,但经冷轧后{001}<110>织构最强。     

专利信息

一种生产普通取向硅钢的方法 一种生产普通取向硅钢的方法,涉及生产普通取向硅钢板的方法。其解决原生产普通取向硅钢板效率低、成本高等问题。其技术方案主要包括：将硅钢板坯在1280℃以上温度条件下进行加热;经加热后的硅钢板坯轧制成1．50～3．00mm厚的热轧钢板;后工序采用两次冷轧法进行常规生产     

降低取向硅钢板坯加热温度的研究

传统取向硅钢生产技术的特点是:以MnS作为抑制相的板坯,在1350～1380℃的高温加热后进行热轧,然后以二次冷轧法进行生产。这种生产工艺的缺点是能耗大、成材率低、修炉频繁、限制轧机能力、成本高。实验室研究表明:通过适当调整钢中的C、Mn、S含量,严格控制酸溶铝含量,同时加入微量的晶界富集元素,可以把取向硅钢板坯的加热温度降低到1250～1300℃。在后步工序的配合下,可以生产磁性良好的产品。本研究是根据实验室的研究成果,在武钢大生产的条件下,为验证降低取向硅钢板坯加热温度的可行性而开展的。并从化学成分、热轧、冷轧、退火工艺方面进行了详细的分析,确立了在大生产条件下最佳的化学成分及工艺参数。得出结论:大生产条件下降低取向硅钢板坯的加热温度是可能的。     

浦项取向电工钢板生产采用低温板坯加热工艺

本发明系有关用于变压器、电机、发电机及其它电力装置中铁芯的取向电工钢板的生产方法。通过设计钢成分，板坯在１２５０～１３２０℃温度范围加热，并进行热轧、冷轧及热处理，最终制造成一般取向硅钢及高磁感取向硅钢。这一板坯加热温度范围与普钢的处理条件相同，因此只用现有的生产条件及生产设备，即可生产具有（１１０）［００１］高取向度二次再结晶、磁感高、铁损低的取向材。由于板坯加热温度低，几乎无烧损，简化生产工艺，故降低生产成本。     

碳对高磁感取向硅钢板坯加热温度的影响

研究了高磁感取向硅钢中C、Mn含量对磁性和板坯加热温度的影响。将不同成分的3％Si高磁感取向硅钢板坯在1225℃～1400℃之间加热并热轧成2.3mm厚。热轧板常化后经一次冷轧成0.35mm。高温退火的试样用双片法测量其磁性。结果证明,钢中的C含量对成品磁性有着重要的影响。当钢中含C量低于0.026％时,即使板坯加热温度高达1400℃也不能使成品发生二次再结晶,磁性极低。 为了得到高磁性所需的板坯加热温度下限随钢中的C、Mn含量而变化。适当提高钢中C含量和降低Mn含量可把板坯加热温度降低到1225℃。     

板坯加热温度对冷轧镀锡板AlN溶解的影响

 通过实验室固溶热处理试验和现场热轧工艺试验研究了板坯加热温度对AlN溶解的影响规律,并采用热力学计算进行了验证,比较了不同热轧加热温度的冷轧退火成品板的织构类型特征。研究结果表明：当板坯加热温度大于1150℃以上时,板坯中的AlN均能较充分溶解,其溶解量大于90%,常规的热轧板坯加热温度能够满足热轧镀锡原板AlN溶解的工艺要求。试验结果为制定合理的热轧镀锡原板加热温度提供了依据。     

QP980热轧中间道次开裂原因分析

针对供冷轧QP980高强钢用热轧原料生产中存在中间坯断裂的问题,通过观察裂纹缺陷的宏观、微观形貌,以及分析其热轧工艺和化学成分,找出了裂纹产生的原因,并提出了改进措施.板坯导热系数小且冷装以及加热速率快导致板坯内应力过大,使板坯在加热炉内产生微裂纹,并在粗轧过程中不断扩展,是造成热轧中间开裂的主要原因.板坯热装,降低加...     

304不锈钢中的夹杂物及其冷轧变形行为

非金属夹杂物是引起冷轧板坯表面缺陷的主要原因.分析了304不锈钢热轧板坯中非金属夹杂物的成分、形貌及尺寸.对304热轧板坯进行不同压下量的轧制,分析不同厚度冷轧板坯中的夹杂物形状和尺寸,研究非金属夹杂物在板坯冷轧过程中的变形行为.结果表明:304热轧板坯中的夹杂物主要组成为CaO-SiO2-MgO-Al2O3的复合氧化物,为脆性夹杂物;冷轧过程中,夹杂物的塑性变形不明显,随着冷轧压下量的增加,大颗粒的夹杂物不断被轧碎,板坯中夹杂物的平均尺寸逐渐减小.     

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.