热轧板常化温度对冷轧无取向电工钢退火组织和磁性能的影响

研究了≤0．005％C-2．5％-2．8％Si的2．5mm热轧电工钢板在850—1100℃常化对0．5mm冷轧板880℃＋950℃退火后组织和磁性能的影响。结果表明，热轧板常化温度升高，冷轧板退火后的再结晶晶粒增大，铁损降低，磁感呈单调递增趋势；热轧板常化温度超过1000℃，因第2相固溶而后弥散析出，退火冷轧晶粒细化，铁损增加，因此该钢热轧板最佳常化温度为1000℃。     

工业纯钛TA2冷轧板再结晶过程的研究

利用Gleeble-3500热模拟试验机对工业纯钛TA2冷轧板进行退火实验,结合硬度法与金相法测定了TA2的再结晶温度,根据Arrhenius公式计算了TA2的再结晶激活能,并对冷轧退火板进行力学性能测试。结果表明保温时间为9 min时,TA2的再结晶温度在520～600℃之间,恒温700℃时,再结晶时间为1.84 min;再结晶激活能Q为5.6578×104 kJ.mol-1;当再结晶退火温度在680～700℃,保温时间在30min左右,钛板可以保持良好的力学性能。     

00Cr12Ti铁素体不锈钢的再结晶退火与成形性研究

 研究了1.0 mm厚 00Cr12Ti冷轧板在再结晶退火工艺条件下力学性能的变化规律。研究结果表明,随着退火温度的升高,维氏硬度、屈服强度、抗拉强度和屈强比均呈快速下降趋势,在超过800 ℃之后变化不大。再结晶退火后,00Cr12Ti钢拥有较多的{111}取向的晶粒,塑性应变比值r0、r45、r90和r-在退火温度超过780 ℃以后都有较大升高,并且r90>r0>r45。在700～800 ℃之间,平面各向异性Δr值变化不大,随后Δr值随温度上升急剧升高,因而成形时易产生严重的制耳现象。通过杯突试验发现,杯突值IE与r-值的变化相一致,表明00Cr12Ti冷轧板在高温再结晶退火后,可获得良好的成形性能。     

退火温度对冷轧态5754铝合金板材组织与性能的影响

在160~400℃范围内对5754铝合金冷轧板进行退火处理,通过显微硬度与拉伸性能测试、金相显微组织与拉伸断口形貌观察等,研究5754铝合金冷轧板的再结晶温度以及退火温度对其力学性能和显微组织的影响。结果表明:随退火温度从160℃升高到400℃,板材的伸长率逐渐增加,但硬度、抗拉强度以及屈强比不断降低,屈强比由0.891降低到0.463。退火温度达到360℃后力学性能趋于稳定;冷轧态5754铝板的再结晶温度为294℃,再结晶终了温度为360℃;在290~300℃温度区间内,随退火温度升高,铝板的显微组织变化明显,于290℃退火后基本上呈现原始的纤维状组织,于300℃退火后出现大量的再结晶晶粒。合金冷轧板及其退火后的拉伸断口主要由韧窝和撕裂棱组成,属穿晶型韧性断裂。     

退火温度对Ti-0.3Mo-0.8Ni钛合金板材组织和性能影响

研究了6 mm厚Ti-0.3Mo-0.8Ni钛合金板材不同退火温度对组织和力学性能的影响。结果表明,600～700℃时α相主要发生回复再结晶过程,同时沿晶界形成链状Ti2Ni颗粒,屈服强度、抗拉强度逐渐降低,延伸率先增加后减少,650℃时,延伸率达到最大值22.5%,随着颗粒物的增加显著降低其力学性能;750～850℃时α相由部分再结晶组织转变为完全再结晶组织,β转变组织由条状转变为块状,屈服强度、抗拉强度、断后伸长率均逐渐降低,850℃时大幅下降至最低值,远低于标准要求;适用于6 mm厚Ti-0.3Mo-0.8Ni钛合金板材退火温度范围是600～650℃。     

CSP流程热轧板常化温度对冷轧无取向电工钢退火组织和磁性能的影响

研究了CSP工艺生产≤0.005%C-1.1%Si的2.2mm无取向电工钢热轧板在800～1000℃常化对0.5mm冷轧板840℃退火后组织和磁性能的影响。结果表明,热轧板常化温度升高,冷轧板退火后的再结晶晶粒增大,铁损降低,磁感增加;热轧板常化温度超过900℃,因第二相固溶而后弥散析出,退火后冷轧晶粒细化,铁损增加,因此该无取向电工钢热轧板最佳常化温度为900℃。     

退火处理对00Cr12Ti铁素体不锈钢组织和性能的影响

研究了700～900℃退火对25 kg真空感应炉冶炼、7道次热轧成3 mm板再冷轧成1 mm板的00Cr12Ti钢的组织和力学性能的影响。结果表明,850℃2 min退火,冷轧板具有良好的综合力学性能,抗拉强度≥400 MPa,伸长率34.5%,加工硬化指数n值0.26,塑性应变比r值1.1;通过电子背散射衍射技术(EBSD)分析得出冷轧板850℃退火时{111}取向最多,再结晶充分。     

含氮马氏体不锈钢420U6冷轧板再结晶退火的热模拟试验

采用Gleeble-3800热模拟试验机并结合硬度法与金相法分别测定了压下率66%含氮马氏体不锈钢420U6的1 mm冷轧板定时条件下的再结晶温度和恒温条件下的再结晶时间,通过Arrhenius公式计算了试验钢的再结晶激活能。试验结果表明,当保温时间为60 s时,试验钢的再结晶温度为664.2℃当退火温度为780℃时,再结晶时间为7.7 s;再结晶激活能Qr为145.3 kj/mol。     

卷取温度对高强IF钢再结晶及织构的影响

为了研究卷取温度对高强IF钢250P1罩式退火再结晶规律的影响,采用氮气炉加热模拟罩式退火工艺,研究了高温及低温卷取工艺下含磷高强IF钢250P1冷轧板再结晶规律;采用X射线衍射仪对700 ℃模拟退火板及罩式退火成品板进行了织构分析,并对成品板金相组织进行了观察。结果表明,低温卷取冷轧板再结晶温度约为675 ℃,高温卷取冷轧板再结晶温度约为700 ℃;低温卷取退火板具有较高强度的{111}有利织构、较高的{111}/{100}比值以及r值,成品板的饼形晶粒更大。     

终轧温度对Cr22Mo超纯铁素体不锈钢织构和成形性能的影响

试验Cr22Mo钢200 mm铸坯1 150℃150 min加热经7道次粗轧~7道次精轧成4.0 mm热轧卷,经980~1 030℃退火和冷轧成0.8 mm板,并经950~1 020℃退火。试验研究了终轧温度850℃和800℃对Cr22Mo钢显微组织、织构及成形性的影响。试验结果表明,降低终轧温度,冷轧板的组织细化、再结晶织构强度增加、平均塑性应变比r值增加、平面各向异性△r值降低,降低终轧温度可显著改善冷轧板的成形性能。     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

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.