Nb＋Ti IF钢冷轧板罩式炉退火工艺研究

在实验室条件下,Nb Ti IF钢的再结晶温度随保温时间的延长而降低.升温速度对再结晶过程有一定的影响,控制在50℃/h为宜.根据罩式炉退火的特点,为保证钢卷的冷点和温度的均匀性,退火控制温度按罩式炉上限控制,并保证足够的保温时间.工业生产和用户使用结果表明,产品冲压性能优良,质量稳定,完全满足用户的使用要求.     

Ti-IF钢回火过程的再结晶规律

本文对比研究了Ti-IF钢罩式退火工艺下的再结晶规律及连续退火工艺下再结晶规律。分别采用随炉升温到不同温度测定再结晶规律,和采用到温入炉保温100s出炉测定再结晶规律。模拟罩式退火采用两阶段随炉升温,所测试样的名义再结晶温度为620,实际的再结晶温度为660℃,实验钢在随炉升温至660℃下完成再结晶过程历时68min;700℃、720℃再结晶的新晶粒开始长大;800℃时,再结晶的晶粒等轴化。模拟连退采用快速升温到不同温度,试样到温入炉保温100s出炉空冷,660℃再结晶开始形核,700℃形核的数量开始增加,720气：形核数量急剧增加,800 ～840℃再结晶晶粒长大,晶粒均匀化,900℃发生二次再结晶,晶粒反常长大。     

退火工艺对Ti-IF钢合金化热镀锌板微观组织织构的影响

研究了再结晶退火温度、退火时间对Ti-IF钢合金化热镀锌板的钢基组织织构及析出相的影响.研究结果表明:在生产中控制退火温度>800 ℃,退火时间≥60 s,维持机速约60 m/min,可获得具有完全再结晶钢基组织、有利织构和较多析出相的产品.此钢板具有优良的成型性能,能够满足用户的要求.     

冷轧Ti-IF钢再结晶温度测定及罩退工艺研究

为了摸索Ti-IF钢的罩退工艺,提高其性能,在Gleeble-3500热模拟试验机上测定了Ti-IF钢的再结晶温度,研究了退火温度、时间等主要因素对Ti-IF钢的再结晶金相组织及力学性能的影响。根据试验结果及罩式退火应用设备的特点,制订了退火工艺,随后进行了工业化生产,冷轧Ti-IF钢的力学性能完全可以满足用户的要求。     

罩式退火工艺对SPCE钢板组织性能的影响

模拟试验研究了罩式退火温度、保温时间和升温速度对SPCE钢板组织性能的影响。结果表明,随着退火温度的升高和保温时间的延长,铁素体晶粒尺寸逐渐增大,组织性能优良。当退火温度和保温时间超过一定限度时,由于网状渗碳体数量增多,性能恶化。最终获得了升温12h到720℃后,保温6h的最佳工艺条件。     

卷取温度对Ti-IF钢退火过程中组织和织构演变的影响

以不同热轧卷取温度生产的典型成分Ti-IF钢冷轧硬卷为研究材料,结合改良森吉米尔法连续热镀锌线的工艺特点,采用Gleeble-1500模拟退火方法和金相、x射线织构测试和硬度测试等分析手段,系统研究了退火过程中试验钢组织、再结晶温度和织构的变化.研究结果表明,随着热轧卷取温度的提高,完全再结晶温度降低;在880℃以下,退火温度对铁素体晶粒度影响很小,热轧低温卷取Ti-IF钢的铁素体晶粒度在11.0级以上,热轧高温卷取Ti-IF钢在lO.5级左右,当退火温度提高到920℃时,晶粒明显粗化;试验钢退火后具有较强的{223}<110>和{114}<110>织构,且热轧卷取温度和退火工艺条件对它们影响较小,随着退火温度的升高,试验钢的{111}织构有增强的趋势,特别是当退火温度较高时,退火温度在920℃时,{111}织构明显增强.     

退火工艺对普通取向硅钢初次再结晶组织的影响

为研究退火工艺对普通取向硅钢初次再结晶组织的影响,对经不同温度、保温时间和升温速率退火后的材料组织进行了分析。结果表明:在等温退火条件下,加热至600℃时开始发生初次再结晶,800℃以上初次再结晶组织发展完善;而在最终冷轧板直接进行最终高温退火的情况下,加热温度在500～700℃时,将升温速率提高到80℃/h,初次再结晶组织更易于发展完善。     

冷轧压下量和退火温度对Ti-IF钢性能的影响

采用正交试验法研究了冷轧压下量(65%～80%)和退火温度(660～780℃)对Ti-IF钢(/%:0.02C、0.012Si、0.10Mn、0.013P、0.011S、0.064Ti、0.0020N)组织、力学和成形性能的影响。试验结果表明,≥700℃退火Ti-IF钢再结晶基本完成,当压下量75%700℃退火时,该钢具有较好的综合性能:屈服强度120 MPa,屈强比0.38,应变硬化指数n值0.25,塑性应变比r值1.65。     

罩式炉退火工艺对IF钢性能的影响

以CSP工艺IF钢为研究对象,利用硬度测量、显微组织观察和力学性能检测等方法研究了退火工艺对IF钢再结晶和组织性能的影响。结果表明:CSP工艺IF钢的再结晶温度为670~680℃;高的加热温度和较长的保温时间有利于改善IF钢深冲性能。     

退火温度对Nb+Ti-IF钢性能与织构的影响

采用显微硬度仪、金相显微镜和X射线衍射仪研究了退火温度对冷轧Nb+Ti-IF钢的硬度性能、金相组  织和织构的影响。试验结果表明:随着退火温度的升高,退火试样的维氏硬度降低,晶粒由轧制的扁长状长成等轴  或近似等轴状态,γ-纤维织构不断吞并α-纤维织构而增强,对应的α-纤维织构则不断减弱。从工业生产和节约能  源的角度考虑,Nb+Ti-IF钢的再结晶退火温度应控制在800℃左右。     

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.