IF钢的金属学进步及存在的问题

1 IF钢的定义尽可能地减少铁中的侵入型元素C、N的含量,添加适量的能与C、N生成化合物的Ti和Nb等元素,将基体内固溶的C、N完全清除的高纯度钢,近几年来称之为IF钢,即无间隙固溶原子的意思,IF钢这一名称现在     

精轧轧制参数对IF钢奥氏体再结晶的影响

对含有Ti,Nb,Ti—Nb的三种无间隙原子钢(IF钢),利用多道次扭转试验,研究了它们总的精轧变形量(从2.1～3.2)和精轧开轧温度(从990～930℃)的影响。这些试验的应变速率为2s~-1。在精轧中,静态再结晶是造成早期轧制阶段轧制间隙期间高度软化的原因。在后来的轧制阶段,动态再结晶的出现取决于钢的化学成分、精轧总变形量和精轧温度。lF钢的临界温度是模拟粗轧工艺确定的。以相同的轧制工艺为条件.Nb固定钢晶粒最细,反之,Ti固定钢铁素体晶拉最大。由于精轧的间隙时间(1～2s)比粗轧的间隙时间要短得多,所以精轧时IF钢呈现出高的未再结晶温度。     

汽车板开发与生产(续)

3.2 超深冲汽车板 超深冲汽车板开发的典型代表是无间隙固溶IF钢。由于钢中的超低碳(C<0.005％)和氮(N<0.005％)被铌(Nb<0.05％)和钛(Ti<0.05％)固定成为碳氮化物NbCN和TiCN,铁素体中不存在任何间隙固溶的C和N原子,因此得名“无间隙固溶钢”(Interstitial Free Steel)。这样的IF钢在冷轧和     

IF钢平面各向异性与制耳效应的研究

分析了提高IF钢的冷轧压下率、调整Ti和Nb含量等方式对IF钢平面各向异性性能及后续深冲过程制耳的影响。结果表明,冷轧压下率从70%提高至82%,IF钢的各向异性性能得到改善;在冷轧压下率为82%时,加入适量Nb元素代替部分Ti,Δr和r值下降的同时制耳指数增加;制耳是塑性应变比和平面各向异性度综合作用的结果。     

微合金化超深冲（IF）钢高品质汽车钢板的标志

微合金化超深冲（IF）钢也称为无间隙原子钢，由于IF钢没有间隙原子，因此具有优异的深冲性能和非时效性，在以汽车（尤其是轿车）工业为代表的现代工业中得到了大量的应用，目前主要用于汽车用深冲级（EDDQ）和超深冲级（SEDQQ）冲压件（轿车覆盖件）的生产。应用实践中要求IF钢钢板性能高度稳定，性能参数分散布度小，屈强比低，r值及n值高。     

IF钢搪瓷板析出相的研究

2001年武钢开始生产冷轧IF钢搪瓷板，为了解IF钢瓷板成分设计的合理性和优化生产工艺，在透射电镜上观察了钢中析出相的形态，用能谱仪分析了析出相的成分，并对析出相的平衡进行了计算。研究结果表明：IF钢搪瓷板中的析出相主要为TiS、Ti4C2S2、TiN以及细小的FeTiP相；钢的碳含量增加和低的热轧加热温度有助于Ti4C2S2相的析出；钢中富余的固溶Ti将在退火温度下形成FeTiP相，粗大的TiS、Ti4C2S2析出相，既使钢板具有良好的涂搪性能，又对钢的深冲性能无有害影响，因此，IF钢搪瓷板具有很好的涂搪性能和深冲性能。     

无间隙原子钢的生产与发展

无间隙原子(IF)钢—新一代汽车用钢的出现,其优异的成形性能和可在线退火的非时效性,为冶金工业和汽车工业展示了良好的发展前景。我国于80年代末亦开始了无间隙原子钢的研制。本文介绍了近年来国内外无间隙原子钢的生产与发展趋势。     

冷轧变形量对Nb-Ti微合金化IF钢组织和性能的影响

试验研究了Nb-Ti微合金化无间隙原子(IF)钢(/%:0.006C、O.005Si、0.15Mn、0.008P、0.006S、0.039A1、0.01Nb、0.048 Ti、0.003 4N)在实验4辊冷轧机由3.98 mm热轧机冷轧至0.4mm(变形量40%～90%)过程组织和力学性能的变化。结果表明,随着冷轧变形量的增加,Nb-Ti微合金化IF钢组织中晶粒逐渐变为细小且纤维化,第二相粒子趋于沿轧制方向排列;钢的硬度、屈服强度、抗拉强度均增加,伸长率下降。变形量在75%和77%时出现低的屈强比,并可获得好的综合力学性能。     

Ti-Nb IF钢铁素体区的热加工性能

按照Gleeble 1500D机热模拟试验结果,通过回归分析得出Ti-Nb IF(无间隙原子)钢(%:0.005C、0.055Al、0.01Nb、0.08Ti)在铁素体温度区(840～780℃)流变应力峰值σ_p与Zener-Hollomon参数Z(T,ε)之间的解析表达式;利用铁素体区变形的功率耗散图和加工失稳图建立了该钢的热加工图,获得其加工安全区和失稳区。结果表明,变形温度800～825℃,应变速率0.02～0.002 s^-1区域为Ti-Nb IF钢铁素体区热加工安全区域。     

微量稀土Ce对IF钢高温力学性能的影响

试验用无间隙原子钢-IF(/%:0.003 6~0.0049C,0.005~0.007Si,0.11~0.12Mn,0.007P,0.005S,0.007~0.011Alt,0.047~0.051Ti,0.003 0N,0~0.003 7Ce)由10 kg真空感应炉熔炼,锻成30 mm×25 mm方坯,终锻950℃,空冷。通过Gleeble-1500D热模拟试验机对试验钢在750~1 150℃进行应变速率0.1 s~(-1)的拉伸试验,研究微量稀土Ce对该IF钢高温拉伸性能的影响。与不含Ce的IF钢相比,含0.003 7%Ce的IF钢的热塑性(Z值)和热强性(R_m值)有明显提高,但随温度提高,增加值减少;IF钢和IF-Ce钢的高温断面收缩率、抗拉强度分别为750℃:(IF)77.62%-110 MPa和(IF-Ce)88.65%-160 MPa;950℃:(IF)87.35%-85 MPa和(IF-Ce)92.88%-100MPa;1 150℃:(IF)85.68%-55 MPa和(IF-Ce)90.62%-58 MPa。稀土元素改善钢的组织、细化晶粒、偏聚于晶界提高晶界强度是其提高IF钢热塑性和热强性的主要原因。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.