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针对HPB235钢在轧制过程中产生翘皮缺陷,从炼钢角度采取多因素分析方法,对影响普碳钢翘皮缺陷产生的各种因素进行了分析,结果表明钢水全氧量及夹杂物量对翘皮缺陷的发生率有较大影响。炼钢系统通过优化转炉-精炼-连铸工艺操作,有效降低了高速线材因脱氧产物及夹杂物而导致翘皮缺陷的高发生率。 相似文献
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电子探针分析表明,翘皮缺陷内部存在聚集的大型夹杂物,翘皮缺陷的形成,是在穿管深加工过程中,管壁不断减薄,夹杂物逐渐外露,表皮外翻所致。翘皮处的夹杂物矿相是以铝酸钙和黄长石为主,还存在少量锆刚玉变质体以及镁铝尖晶石,跟下水口侵蚀反应产物相吻合;聚集的大型夹杂物与下水口侵蚀后的脱落物有关。 相似文献
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第一钢轧厂1700线连铸机生产的冷轧用钢(SPHC、SPHD、SPHE等)在后续冷轧过程中出现大量翘皮缺陷。通过扫描电镜对板卷翘皮部位夹杂物进行检测,同时结合现场实际情况进行分析,得知翘皮缺陷产生在的主要原因,是在连铸工序中保护渣或钢水中夹杂物在铸坯凝固时未来得及上浮,存在于铸坯表面,在轧制后分层,形成翘皮缺陷。采取相应对策,使得冷轧料翘皮缺陷得到有效控制。 相似文献
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热轧钢板表面翘皮缺陷的特征和形成机理 总被引:1,自引:0,他引:1
采用扫描电镜和光学显微镜对120 t转炉-RH-CC冶炼工艺生产的Q345E高强度合金钢热轧板表面翘皮缺陷进行了分析,发现在翘皮微区域出现了铁氧化物和保护渣残留物及二次氧化物,铁素体和珠光体排列没有规律,铁素体比例很高,脱碳严重。并发现,中间包氩气流量过大导致气泡包裹保护渣进入钢液形成铸坯表层皮下气孔,加热时二次氧化以及轧制时氧化铁皮压入钢板是热轧板中形成翘皮缺陷的主要原因。通过将中间包吹氩流量从65 L/min降至50 L/min、拉速由1.0 m/min调整到1.2 m/min等工艺措施,使翘皮缺陷发生率由3.68%降至0.8%。 相似文献
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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。 相似文献
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<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 相似文献
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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, 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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, 相似文献
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《China Nonferrous Metals Monthly》2014,(12)
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. 相似文献
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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. 相似文献