钢包喷粉对16MnR、20g质量的影响

本文介绍了重钢二炼钢厂90吨碱性平炉应用合成渣+钢包喷射CaSi粉处理钢水的工艺生产16MnR、20g的主要工艺参数、冶金效果;对钢中硫、磷及气体含量变化进行了分析和讨论;指出该工艺既能缩短冶炼时间,又能提高钢质,且能开发新产品。     

新产品开发及品种钢生产的对策

分析柳钢新产品开发及品种钢生产的现状,结合优质增效要求,认为新产品开发和品种钢生产是提高公司竞争力的着力点,从研发管理、技术储备和人员的培训等方面提出对策和建议。     

新常态下柳钢品种开发工作的思考

分析柳钢新产品开发及品种钢生产的现状,结合公司降本增效要求,从开发管理、产品定位、技术服务、品牌建设等方面提出了钢铁工业新常态下柳钢新产品开发和品种钢生产的工艺技术工作思路。     

碳化硅在炼钢中脱氧研究

本文旨在通过冶金热力学、动力学计算分析,试图探讨碳化硅粉的脱氧机理,采用了钢渣界面脱氧这一新概念。而后以生产数据证明:碳化硅粉脱氧机理是:部分是扩散脱氧、部分钢渣界面脱氧;碳化硅粉脱氧优于硅铁粉和炭粉混合使用;采用碳化硅粉脱氧可提高生产率2.17％,降低冶炼电耗9度/t钢,降低成本6.45元/t钢,完全能够保证钢的质量,因此碳化硅粉代替硅铁粉+炭粉脱氧很有推广价值。     

无偏析预混合钢粉研究与开发的进展

无偏析预混合钢粉是在钢铁粉末体系中加入少量粘结剂所制得的一种特种粉末,其目的是减少粉末运送和压制过程中产生扬尘和偏析,提高产品组织、性能和尺寸的一致性。本文综述了国内外对预混合钢粉研究和产品开发的进展,对预混合钢粉的优势、粘结剂组成、混合工艺和混合机理、偏析测定、粉末性能等进行了详细分析和评述。     

2004年柳钢新产品开发简介

2004年以来，在国际国内钢材市场利好的推动下，尤其公司下发有关鼓励新产品开发的文件后，柳钢新产品开发迈入了一个崭新的阶段，先后开发生产了ASTMA36钢板、AST—MA572Gr50钢板等8个新产品，新产品的产量和数量较往年均有大幅度提高，取得了良好的经济效益。     

316L、317L的MIM注射成形生坯件溶剂脱脂工艺研究

介绍了316L、317L两种不锈钢MIM生坯溶剂脱脂过程中溶剂种类、溶剂温度、工件厚度、钢粉的粒度及形貌对溶剂脱脂过程的影响。结果表明：选择正己烷作溶剂，控制溶剂温度37℃可以避免溶剂脱脂过程中工件开裂、鼓泡问题，而且能减少对环境的污染，给操作者提供更好的劳动条件；溶剂脱脂早期大粒度球形钢粉的生坯要比小粒度不规则形状钢粉的生坯脱脂速度快，但后期小粒度不规则形状钢粉的生坯脱脂较大粒度球形钢粉的生坯速度快。     

邯郸市金属材料厂成绩显著

邯郸市金属材料厂,近几年来共开发H24铜铝合金粉末、R_1载体铁粉、流体高频焊管三大系列32个品种,并有多种产品获奖。汽车轴瓦专用H24铜铅合金粉荣获九一年度邯郸地区科技进步一等奖和九一年度河北省优秀新产品二等奖;R_1载体铁粉、锡磷青铜新产品荣获九三年度河北省优秀新产品三等奖;并被国家经贸委列入九四年度国家级重点新产品;用于硬质合金工具材料的雾化钴粉和雾化锡10粉,取得了河北省科技     

加速技术进步促进产品开发

对攀钢几年来开发的２０ＣｒＭｎＴｉ齿轮钢、０９ＳｉＶＬ汽车大梁用钢、ＰＤ３重轨、、Ｘ５２管线钢以及７０硬线钢等新产品的情况作了介绍，指出新技术和一些必要的工艺和规程是新产品质量的保证，文章最后还就攀钢近期新产品开发的技术难点谈了应采取的对策。     

攀钢提出中期发展目标

据悉，攀枝花钢铁（集团）公司已把２０００年实现销售收入１４０亿元、盈利１亿元；２００２年实现销售收入１５０亿元，盈利５亿元，作为企业奋斗目标，并出台了相应的措施。———坚决走品种、质量、效益和资源可持续发展之路，大力开发国家基础设施建设急需的铁路用钢、建筑用钢、汽车制造用钢等新产品和替代进口产品。在建筑用钢方面，大力开发强度高、抗震性能好的含钒钢筋等线材新产品。积极与用户联合开发，强化新产品的市场针对性。———在降成本工作取得成绩的基础上，坚持依靠科技进步不可逆转地降低成本的方针，坚持科技开发基…     

稀土Y对气雾化制备PH13-8Mo钢粉末特性的影响

摘要：研究了不同含量的稀土Y对选区激光熔化技术(SLM)用PH13 8Mo钢粉末特性的影响，并通过Thermo-Calc热力学软件、粉体综合特性测试仪、霍尔流速计、激光粒度分析仪、扫描电镜和电子探针等方法对不同Y含量的PH13-8Mo钢粉末特性的变化规律进行研究。结果表明，随着金属粉末中Y含量的增加，金属粉末的松装密度从3.73提高到3.93g/cm3，50g粉末的自由流动时间从25.44减小到25.11s，粉末的流动性变好。同时，PH13 8Mo钢粉末的平均粒径从37.29减小到30.99μm，粉末的粒度分布区间变窄。研究还发现，不含Y的PH13-8Mo钢粉末的组织由树枝晶和等轴晶组成，而Y质量分数为0.080%的PH13 8Mo钢粉末的组织均由等轴晶组成。综上，在PH13.8Mo钢粉末中加入稀土Y，粉末的特性得到优化。     

Effect of Chromite-Silica Sands Characteristics on Performance of Ladle Filler Sands for Continuous Casting

 Free opening rate is mainly determined by the performance of the ladle filler sand. High free opening rates of ladles are required in steel making to improve steel quality. Chromite ladle filler sands are one of the most widely used ladle filler sand. Several operative variables and materials characteristics affect the performance of the sands. Three sets of chromite ladle filler sands were selected and researches were focused on the sintering behaviour and performance of the sands under operative conditions. The effect of particle size distribution on sintering, microstructure, flowability, and permeability were presented. In all cases, the particle size varies from 01 to 15 mm corresponding to free flowing powders. One of the samples has higher permeability factor in comparison with others due to low particle size distribution. The other sample presents very good free opening due to its very good flowability and permeability factor.     

Hot Pressing Technology to Produce Wear-Resistant P/M Structural Materials with Dispersed Solid Inclusions

We have examined the possibility of milling iron, nickel, chromium, high-speed steel, and titanium carbide powders in an attritor (attrition mill) for use in producing carbide steel. The powders were milled to a particle size of 1–3 μm for TiC and 10 μm for metal components. As a rule, such powders and mixture of powders do not flow or form, which makes it impossible to produce blanks for hot pressing by the traditional die pressing method. Shells pressed from iron powders are proposed for forming a blank. We tested techniques for hot pressing dispersed powders into such envelopes. __________ Translated from Poroshkovaya Metallurgiya, Nos. 7–8(444), pp. 43–50, July–August, 2005.     

Investigation on Rapidly Solidified T15 High Speed SteelPowder and Its Bulk Microcrystalline Material

ＩｎｖｅｓｔｉｇａｔｉｏｎｏｎＲａｐｉｄｌｙＳｏｌｉｄｉｆｉｅｄＴ１５ＨｉｇｈＳｐｅｅｄＳｔｅｅｌＰｏｗｄｅｒａｎｄＩｔｓＢｕｌｋＭｉｃｒｏｃｒｙｓｔａｌｌｉｎｅＭａｔｅｒｉａｌＹｕＨｕｉ；ＤｉｎｇＦｕｃｈａｎｇ；ＷａｎｇＥｎｋｅ；Ｖ．Ｎ．ＤｉＧｉａ...     

连铸中间包碱性覆盖剂及其冶金效果

连铸中间包覆盖剂对钢的清洁度有很大影响，碱性覆盖剂与酸性覆盖剂相比具有绝热保温，防止钢水二次氧化，有效地吸收钢水中的非金属夹杂（主要是Ａｌ２Ｏ３）防止碱性中间包材材料侵蚀等优点。     

A Novel High Nitrogen Steel Powder Designed for Minimized Cr2N Precipitations

High nitrogen steels provide excellent mechanical properties and corrosion resistance but are prone to form precipitates which adversely affect the corrosion resistance and toughness. High nitrogen steel powders currently available in the market are not claimed to be precipitate free. It is critical to avoid these precipitates while retaining nitrogen in the dissolved form to realize the value of these powder alloys. However, retaining high level of dissolved nitrogen in steel powder during melt atomization process is very challenging. Instead, solid-state dissolution of nitrogen into the powder alloy followed by rapid cooling may provide a convenient approach to avoid precipitate formation compared to traditional melt processing. This study presents a solution treatment approach to achieve elevated dissolved nitrogen levels (~ 0.4 wt pct) in Fe–Mn–Cr powder alloy with negligible precipitation of nitrides. The influence of starting material, holding time, temperature and cooling rate on the resulting microstructure is presented. A fully austenite matrix with high dissolved nitrogen content resulted in powders with desired mechanical properties.

     

从专利申请看我国金属粉末技术现状和发展趋势

通过对我国金属粉末生产技术及其产品专利的申请情况调研和分析,了解到我国金属粉末专利申请自1985年至今一直呈上升趋势,2000年以后发展更为显著。这表明我国金属粉末技术的发展有了长足的进步。进入21世纪以来不仅是一些常规制粉工艺进一步得到完善和发展,而且许多新工艺方法,诸如预合金钢粉、预混合钢粉、弥散强化粉、温压用粉末、机械合金化粉等金属粉末新品种得到进一步开发和应用。与此同时,日本、美国、德国、瑞典等30个国家来华申请了1047项专利,这说明我国金属粉末制造领域日益得到国外重视。     

增材制造用金属粉末爆炸敏感性研究

针对粉尘云最小着火能量(minimum ignition energy, MIE)、粉尘云最低着火温度(minimum ignition temperature of dust cloud, MIT_C)和粉尘层最低着火温度(minimum ignition temperature of dust layer, MIT_L)等参数, 开展了针对增材制造用金属粉末爆炸敏感性及影响因素的研究。结果表明, 镍合金粉末和不锈钢粉末爆炸敏感性较低, 而钛合金粉末的敏感程度略高于铝合金粉末, 八种粉末的爆炸敏感程度排序为: TA15>TC4>AlSi10Mg>316L>GH4169>GH3536>GH3625/304L。镍合金粉末和不锈钢粉末均不能被点燃; 钛合金、铝合金粉末的MIE和MIT_C均随粉尘浓度的升高呈先降低后升高的趋势, 而随喷尘压力的升高呈先降低后升高的趋势。     

Fe-Ni-Mo-Cu-Co-Cr-Mn水雾化合金钢粉的研制

本文介绍了一种用于生产汽车排气阀座的Fe Ni Mo Cu Co Cr Mn水雾化合金钢粉的研制过程 ,分析了有关工艺控制对该种含Cr、Mn易氧化元素粉末氧含量和颗粒形状、粒度组成、松装密度、压缩性、流动性等性能指标的影响 ,确定了为获得低碳、低氧含量、高松装密度、高压缩性和高成形性的Fe Ni Mo Cu Co Cr Mn水雾化合金钢粉应采取的有关措施 ,为批量生产质优价廉的排气阀座用水雾化合金钢粉找出了一条有效的途径。     

Effects ofcontaminationonproperties of W-15Cu preparedfrom mechanically alloyed powders

Abstract

To eliminate the contamination of activator elements, such as Fe and Ni, W-15Cu compacts were prepared from mechanically alloyed powders using an attritor with a zirconia tank, balls and agitator arms. Coarse tungsten and copper powders, 9·9 μm and 13·3 μm, respectively, were milled to 1·26 μm composite powders after 145h of milling. The milled powder contained little free copper and was highly combustible in air. After sintering, the 50 vol.-% dense green compacts attained a density of 15·8g cm^-3 or 96·2%. The microstructure consists of uniformly interdispersed tungsten and copper. When stainless steel grinding balls were used, the powder was heavily contaminated with Fe and Ni. The contamination improved the density slightly, but the grain size and the electrical resistivity increased significantly as well. The sintering behaviours of the two composite powders were similar. Most densification occurred during heating before reaching the melting point of copper.