提高冷轧钢板表面清洁度措施

针对不经电解清洗的冷轧带钢如何提高表面清洁度进行了研究,详细分析了乳化液对轧后钢板表面残留物的影响及罩式退火工艺对成品钢板表面清洁度的影响,提出了改善罩式退火后钢板表面清洁度的有效措施。     

提高冷轧汽车板表面清洁度的研究

根据轧制原理和轧制油的特性，改善轧制润滑工艺，提高钢板表面清洁度，解决了汽车板表面清洁度问题。     

冷轧钢板表面粗糙度影响因素分析

介绍了影响冷轧钢板表面粗糙度的主要因素和粗糙度测量方法,并以鞍钢冷轧厂2’线五机架连轧机和四辊平整机为研究对象,结合大量实测数据进行了分析,提出了改善钢板表面粗糙度的具体措施,应用到生产中后,效果显著。     

冷轧条件对超低碳冷轧钢板r值的影响

关于冶金因素对冷轧钢板ｒ值的影响已有许多研究和报道，但是，有关机械因素对ｒ值影响的报告却很少。本研究利用刚塑性有限元法得到的结果，就辊身直径、板厚和每次压下量对超低碳冷轧钢板ｒ值的影响进行了研讨，得出了以下结果：（１）冷轧和退火钢板的ｒ值随辊身直径的增大而提高，随冷轧时原始板厚的减小而降低。（２）在考察连续冷轧过程中板厚和每道次压下率发生变化时，发现ｒ值与（辊径Ｄｉ）／板厚（ｔｍｉ）和每道次冷轧压     

冷轧钢板的表面形貌及评价方法

本文综述、讨论了塑性成形过程中冷轧钢板表面形貌与摩擦及损伤的关系。理论分析表明:摩擦系数的大小与板面凹坑深度的平方成比例;凹坑分布的不均匀将造成摩擦力分布的不均;板面上的硬质点,尖峰和脆性氧化物等会造成表面划伤,从而影响成形件的表面质量。文中还结合冷轧钢板的实际情况介绍了几个定量描述表面形貌的粗糙度指标。     

冷轧后带钢板面清洁度的研究

通过分析影响轧后带钢板面清洁度的因素,采用调整轧辊的粗糙度、优化乳化液系统各项指标等措施,改善了轧后带钢板面清洁度。     

最新高强度冷轧钢板

最新高强度冷轧钢板［日］濑户一洋等１前言７０年代的石油危机，迫使人们在减少ＣＯ２的排放量、降低燃料费用、减轻汽车车体重量方面作了很多努力。这一时期，高强度钢板取得了长足的进步，如加Ｐ的固溶强化钢、利用Ｔｉ、Ｎｂ等的析出强化钢、大幅度改善延展性的复合组...     

低合金结构钢腐蚀的影响因素及其耐蚀性判据

通过对不同厂家或产线生产的相近成分和显微组织的8种低合金工程结构钢样品进行中性盐雾加速腐蚀试验,结合成分测试、微观组织分析、腐蚀产物分析及数据统计与计算拟合等方法,提出了评价低合金结构钢耐蚀性的综合耐蚀指数及其包含钢材成分、夹杂物、组织及晶粒度等多因素的数学表达式。研究结果表明,低合金工程结构钢的耐蚀性除与传统的耐蚀指数I相关外,还受钢中夹杂物、显微组织、晶粒度等多种材料因素的耦合影响,其影响程度按从大到小排序依次为耐蚀合金元素所决定的耐蚀指数I、夹杂物总量、珠光体含量和晶粒度级别。综合耐蚀指数Y可作为比耐蚀指数I指数更有效的低合金钢耐蚀性判据,具有重要的工程应用价值。      

Influence of microalloying on the corrosion resistance of steel in saturated calcium hydroxide

The influence of microalloying vanadium or titanium on improving the corrosion resistance of mild steel in saturated calcium hydroxide solution was investigated. Potential-time, potentiodynamic polarization, and impedance measurement techniques were employed. The corrosion products have been examined by infrared and X-ray diffraction analysis and by scanning electron microscopy. It has been shown that the grain refining, due to microalloying, plays an important role in enhancing the corrosion resistance of steel. Scales of calcite and iron oxides on top of a protective oxide are formed on the investigated steels.     

Influence of arsenic on the corrosion resistance of low-carbon low-alloy steel. Part 2

Literature data regarding the influence of arsenic on the corrosion resistance of low-carbon low-alloy steel are analyzed. A mechanism explaining this influence in air and in sea water is proposed.     

Influence of arsenic on the corrosion resistance of low-carbon low-alloy steel. Part 1

Literature data regarding the influence of arsenic on the corrosion resistance of low-carbon low-alloy steel are analyzed. A mechanism explaining this influence in air and in sea water is proposed.     

钛合金化过程对钢液洁净度的影响

重点考察了Ti合金化过程中影响Ti收得率的主要因素,并对比分析了Ti合金化前后夹杂物的物相变化及夹杂物的去除效果.控制氧活度a_[O]<350×10_-6,Al、Ti合金加入时间间隔大于3 min,可以保证Ti收得率>85%;当a_[O]>350×10^-6时,需控制Al、Ti合金加入时间间隔为5 min以上.相同a_[O]和[Al]_s情况下,延长Al、Ti加入时间间隔可以有效提高Ti收得率.RH处理过程中,钢包内当量直径>200μm的Al₂O₃夹杂物在5 min内基本可以上浮去除,但相同尺寸的A-Ti-O复合夹杂的去除时间要比Al₂O₃长1~2 min.Ti合金加入后,Al₂O₃夹杂物周围会形成Al-Ti-O的复合夹杂,这些夹杂物的形成降低Ti的收得率.     

退火温度对冷轧中锰钢力学性能的影响

在不同温度下对冷轧中锰钢(Fe-0.1C-5Mn)进行退火试验,研究了其力学性能的变化,通过单轴拉伸试验获得了不同热处理条件下的力学性能。研究结果表明:退火温度从550℃升高至800℃,冷轧中锰钢的抗拉强度和屈服强度先降低后升高;断后伸长率和均匀伸长率以及强塑积则先升高后降低,在650℃时达到最大值。在650℃退火后产生较多的逆转变奥氏体,在形变过程中产生持续TRIP效应,冷轧中锰钢获得了较高的强度以及良好的塑性,强塑积可以达到31 GPa%。     

冷弯加工对国产301L不锈钢耐点蚀性能的影响

采用化学浸泡法、电化学测试研究了冷弯加工前后轨道交通装备用国产301L高强不锈钢腐蚀行为,并对化学腐蚀和电化学腐蚀后样品的表面进行扫描电镜和能谱分析。化学浸泡法结果表明,冷弯后的国产301L高强不锈钢在50℃的6%（质量分数）FeCl3溶液中浸泡72h后发生了明显的点蚀,腐蚀速率随时间的延长而迅速增大,72h后腐蚀速率达到128.5g/(m2·h)。电化学测试结果表明,国产301L高强不锈钢经过冷弯加工后,在3.5%（质量分数）NaCl溶液中的点蚀电位下降365mV,钝化区宽度减小150mV,增加了点蚀敏感性。     

Influence of calcium treatment on cleanness and fatigue life of 60Si2MnA spring steel

Contrasting experiments of Al killed 60Si2MnA spring steel were carried out between using and excluding calcium treatment under LF refining slags with low and high basicity ratios (R: CaO/SiO₂?=?3.4, 5.0), respectively. Results showed the high basicity refining slag had a certain effect on controlling inclusions and improving the cleanness of spring steel similarly to calcium treatment. The T.[O] (total oxygen) content of steel without calcium treatment got to below 15?ppm and the fatigue life was long, up to 7.8?×?10⁶?cycles. But in order to reduce the T.[O] below 10?ppm, as well as inclusion number and size in spring steel further, meanwhile, the appropriate calcium treatment should still be used. Besides, as the [Ca] content in the steel with calcium treatment increased, inclusions transformed from Al₂O₃–SiO₂–CaO–MgO to Al₂O₃–SiO₂–CaO–MgO–CaS completely, which reduced the formations of voids between inclusions and steel matrix, and voids decreased with the increase of CaO/Al₂O₃ value and CaS content of inclusions. Finally, the fatigue life of spring steel with high basicity slag and calcium treatment increased to 9.1?×?10⁶ cycles.     

Production of cold-rolled steel coils

The aspects of cold rolling and subsequent coiling that affect the quality of the steel strip produced are identified on the basis of theoretical and experimental research and production experience at various steel plants. The influence of the strip width and thickness, the surface temperature, the temperature of the rolled metal, and other factors on the stress-strain state of the coils is established. Rational rolling and coiling conditions at continuous and reversible mills are recommended.