时效对冷拔珠光体钢力学性能的影响

用TEM观察了共析珠光体钢经真应变为2．89的拉拔变形以及不同温度时效后微观组织的变化，测量了时效温度对力学性能的影响．结果表明，大变形珠光体钢在473K时效后获得相对于时效前（σb=2061MPa）更高的抗拉强度（σb=2300MPa），在673K时效获得较均衡的强韧性能（σb=1856MPa，δ=3．7％）．组织观察发现，大变形中溶解的渗碳体在时效过程中弥散析出，分析认为碳化物的析出阻碍位错运动，提高了该钢的力学性能．     

热轧窄带钢车间改造设计实践

介绍了将串列式、横列式热带生产线改造成半连续、３／４连续式生产线的设计实践。改造后可以连铸坯为原料，实现一火成材，并使卷重增加，产量和成材率提高。     

彩色不锈钢生产工艺及其耐蚀性的研究

采用添加了ＣＳ－１添加剂的常规的不锈钢着色液可以生产出彩色不锈钢。所获彩色膜除包括在常规的着色液中可获得的颜色外，还能着出茶色、咖啡色、古铜色等颜色。通过动电位扫描极化曲线等的测量和分析，研究了所得着色膜的耐蚀性能，并解释着色膜经硬化处理后，耐蚀性得到提高的原因。     

316L不锈钢在硫酸盐还原菌与铁氧化菌溶液中的腐蚀及电化学行为

1 INTRODUCTION Type 316L stainless steel has good corrosion re- sistance and has been used increasingly for cooling water service in the chemical, petrochemical and power utility industries. However stainless steel is susceptible to localized corrosion by chloride ions and reduced sulfur compounds[1]. The presence of micro- organisms on a metal surface often leads to highly localized damages in the concentration of the electro- lyte constituents, pH and oxygen levels[2]. These mi- croorg…     

钢管除锈机设计与经验

介绍了钢管除锈机的基本原理及设计过程,实践证明:使用钢管除锈机不仅保证了除锈质量,还提高了工作效率。     

Electrochemical pitting behaviour of type 321 stainless steel in sulfide-containing chloride solutions

The pitting behaviour of type 321 stainless steel in sulfide-containing chloride aqueous environments was studied using cyclic potentiodynamic polarization. A well-established correlation between H₂S and Na₂S₂O₃ in the study of corrosion was applied, that is, H₂S was simulated by Na₂S₂O₃. The major factors affecting the pitting corrosion of type 321 stainless steel are the Cl^- concentration, solution pH and temperature. The results clearly indicate that both E_pit and E _pp decrease with increasing Cl^- concentration and temperature, while I _pass is more sensitive to temperature variation. E _pit decreased with decreasing pH in the range 2 < pH < 7.5. The surface morphology and chemistry of the corroded type 321 stainless steel resulting from anodic polarization in 0.01 M S₂O ₃ ^2- -containing Cl^- solution were analysed by XRD, SEM and EPMA. A higher concentration of sulfur was found in the pits, and the dark surface film was mainly composed of FeS and -Fe₂O₃. The results describe the pitting behaviour of type 321 stainless steel in sulfide-containing Cl^- aqueous environments.     

Zinc Coated Steel/Epoxy Adhesive Systems: Investigation of the Interfacial Zone by FTIR Spectroscopy

The present study takes advantage of the ability of Fourier Transform Infrared Spectroscopy (FTIR) for the analysis of ultrathin organic films on metals. FTIR in the reflection mode (IRRAS) is used in order to study the interaction of ultrathin films of dicyandiamide (hardener of most one-pack epoxy resins) with various substrates, model ones such as gold or zinc and industrial ones such as steel and zinc-coated steels.

Pure zinc surfaces and, to a lesser extent, zinc-coated steels are shown to react with dicyandiamide after heating at 180°C, as evidenced by the frequency shift of the absorption band (at about 2200 cm^-1) characteristic for nitrile groups. As real systems consist of thick layers of a fully formulated adhesive cured onto a metallic substrate, the direct investigation of such a buried interphase is no longer possible by FTIR and by most of the known spectroscopies. Some mechanically tested specimens are then analysed, after failure, by FTIR microspectrometry. The spectra obtained, corresponding to the fracture initiation zone which is about 100 μm in diameter, advocate for the presence of an ultrathin layer of modified polymer still covering the substrate.     

防火涂料的防火性能及其测量

本文依据有关国家标准对饰面型防火涂料和钢结构防火涂料的防火性能及其检测方法作了简要介绍。     

超低碳不锈钢管-管板的焊接工艺试验与应用

超低碳不锈钢316L管-管板的焊接采用手工钨极氩弧焊,对316L不锈钢的焊接性进行了分析和研究,通过工艺试验,证明了焊接工艺的可靠性,并在不锈钢浓H2SO4冷却器阳极保护(管壳式)设备的焊接中取得了满意的效果.     

Numerical analysis of galvanic corrosion of Zn/Fe interface beneath a thin electrolyte

A numerical analysis of galvanic corrosion of a Zn/Fe interface beneath a thin layer electrolyte is presented. Specifically, a circular defect, where the zinc coating has been removed, is considered. It is assumed that both oxygen reduction and iron oxidation can occur on the Fe surface, while only zinc oxidation occurs on the Zn surface. The importance of electrolyte thickness and conductivity and defect radius is considered. It is assumed that the iron and zinc oxidation rates are described by a Tafel relationship. If the kinetic parameters of the oxidation reactions are known, the cathodic protection of Fe is a function of a Wagner number, the ratio of the electrolyte thickness to the defect radius, and the ratio of the radius of the defect to the outer radius of the zinc layer.