Recent developments in stainless steels:austenitic,ferritic,duplex

A review is given concerning some of the recent industrial developments of stainless steels. In austenitic stainless steels,two different directions of alloy development are noticeable:low nickel austenitic stainless steels and high nitrogen stainless steels.In these two cases the aims are different,particularly in terms of strength,but the philosophy of alloy development and the scientific approaches are very similar and they all revolve about the role of nitrogen as an alloying element and how this affects strength,ductility and corrosion resistance. There is now a broad and useful basis of information as to how nitrogen affects solid solution hardening,grain boundary hardening and work hardening and how to make use of these effects in developing materials required by the world market. In the field of corrosion resistance,ferritic,duplex and austenitic stainless steels compete with each other and now there is a growing body of information concerning the relative corrosion resistance based on laboratory data. However,for practical applications and for alloy selection,more than just laboratory data are needed,and thus,the first results are presented here of a many years comparison of the corrosion resistance of 24 commercial stainless steels exposed to corrosion in outdoors marine atmosphere.Hope is expressed to involve in the near future even more steels from a wider range of manufacturers in such corrosion studies.This might help consumers in appropriate alloy selection.It might also help steel makers in developing appropriate stainless steel grades.

Development history and technological progress of non-oriented electrical steel sheets at Baosteel

This paper briefly summarized the development history, product catalogue and magnetic properties of non- oriented electrical steel sheets at Baosteel, as well as the development and application of high-value-added steel grades. Recent advances in manufacturing electrical steel sheets were also introduced, including technologies for controlling inclusion,for producing high-grade steel strips by a tandem rolling mill and for controlling the transverse thickness difference of steel sheets, and the development of environmentally friendly coatings.

Suggestions on Process Technology Development of Iron and Steel Making in China

1 Introduction The 21st century is coming and the world iron and steel making technology is facing an important technical evolution at this century turnover,which is reflected in two aspects:①Rapid development of traditional iron&steel making technology with continuous regeneration;②Three major frontier techniques of metallurgy(smelting reduction;near-net-shape continuous

The Capital Iron and Steel Corporation's Fast Development of Exposer Trade

The Capital Iron and Steel Corporation (Shou Gang) is one of the eight major iron and steel companies in China and one of the first state-owned enterprises to be selected as a testing ground for the reform programme, since it was authorized to manage its own foreign trade in 1981, the Corporation’s export trade has expanded steadily. Especially since 1992, its development in foreign trade has skyrocketed because China Shou Gang International Trade Construction Company was approved to be set up. In 1993, it exported 239,700 tons of steel. Its foreign exchange income reached US$630 million, of which the Shou Gang’s self-managed exports took up US$96.98 million. During the

High speed continuous turning of hardened steel with newly developed low content PCBN

In this study,newly developed low content PCBN was used to evaluate the cutting performance in high speed turning of hardened steel.Using new PCBN and commercially available PCBN tipped inserts under the same cutting condition,cutting performance with variable cutting speed,feed rate and depth of cuts on tools were measured by observation of flank and crater wear.Its microstructures were analyzed through SEM microscope,measurement of surface roughness on workpiece was also performed. According to cutting performance results,it is shown that new PCBN shows much longer tool life in high speed continuous turning than our conventional PCBN tools,with improved wear and chipping resistance.This result on the machinability of new PCBN for hardened steel will provide effective guidelines to manufacturing engineers,also provide useful economic machining solution for high speed continuous turning for hardened steel.

河北省钢铁产业发展态势及对策研究

河北省的钢铁产业及由此而形成的钢铁产业链是本省的支柱产业及产业群。分析河北省钢铁产业在全国工业布局的区位功能及对本省社会经济支撑程度,对河北省钢铁产业发展的基础条件及存在的问题进行了具体的剖析,全面诊断本省钢铁产业的发展态势,并就实现本省钢铁产业可持续发展进行具体的对策研究,为合理规划和调整整个产业的发展战略提供了有益参考。

我国模板与脚手架新技术发展的几点意见

针对我国新型模板和脚手架推广应用过程中，大家关心的问题，阐明了胶合板模板和钢框胶合板模板应是模板技术的发展方向、开发高质量的竹胶合板模板、采用低合金钢管脚手架逐步取代普碳钢管势在必行及加强产品质量监督和管理等８

我国船板用钢发展趋势及莱钢应对策略分析

分析了我国船舶工业和船板制造业的现状与发展趋势,并着重分析了重点企业的生产现状;分析了船板生产技术以及典型船板的市场现状与发展趋势,总结出我国船板市场呈现出良好的发展态势,并对莱钢宽厚板产品开发提出了建议,对同类企业具有重要借鉴的意义。

莱钢发展循环经济的模式与实践

莱钢在发展循环经济的实践中，形成了以生态理论研究为先行，生态理论工业化，技术创新边界化，钢铁制造、能源转换、社会大宗废弃物消纳处理、固废资源化四大功能完善化，资源利用3R化，企业环境友好化“五化”方针为指导，以系统科学管理、技术措施、自主创新同步实施为手段，以企业内各厂内部、企业内部工厂（序）之间和企业与社会之间的物质与能量合理流动构成的三个层次充分循环以及钢铁产品高效生产链、工业用水循环链、二次能源回收利用循环链、固体废弃物再利用循环链四个物链为核心，以创建资源节约型、环境友好型企业为目的的循环经济发展模式并具体实践，取得了良好的社会效益、经济效益和环境效益。

Y形截骨术治疗儿童发育性髋内翻的疗效观察

目的探讨Y形截骨术治疗儿童发育性髋内翻的疗效。方法 2008年1月-2011年10月,收治10例14髋儿童发育性髋内翻。男4例5髋,女6例9髋;年龄5～12岁,平均7.8岁。患儿均有明显跛行步态,髋部外展、内收、旋转受限。摄骨盆正位X线片,测量颈干角为46～110°,平均87°;双髋Y形软骨的Hilgenriener线与股骨上干骺端骺板线的夹角(Hilgenreiner-epiphyseal angle,HE)为36～93°,平均57°;股骨头最高点平面与股骨大粗隆顶点平面间距离(articulotrochanteric distance,ATD)为—25～6 mm,平均—3 mm。采用股骨粗隆下股骨外侧Y形截骨矫形,联合外展截骨角钢板内固定。结果术后切口均Ⅰ期愈合,无手术相关并发症发生。患儿均获随访,随访时间14～40个月,平均18个月。患儿跛行步态消失或明显减轻,髋关节外展、内收、旋转活动范围均不同程度增大。术后复查X线片示,垂直的股骨近端骺板均恢复至水平位置,患髋颈干角为130～153°,平均137°;HE角为23～35°,平均27°;ATD为3～22 mm,平均14 mm。末次随访时,根据刘建德的疗效评价标准评定,获优5髋,良8髋,可1髋;优良率达92.8%。除1例于术后30个月髋内翻畸形复发,其余患儿均无复发。结论 Y形截骨术治疗儿童发育性髋内翻具有截骨方法简便,矫形充分,术后允许早期活动的优点,可获得满意临床疗效。