大方坯连铸动态轻压下技术应用研究

攀钢全连铸工程新建的大方坯连铸机采用了奥钢联SMART／ASTC动态轻压下技术。自大方坯连铸机投产以来,以重轨钢、硬线等典型钢种为代表开展了应用大方坯连铸轻压下技术的试验研究。通过不断优化调整轻压下工艺制度,取得了改善铸坯中心偏析、疏松和缩孔的显著效果。结果表明,铸坯表面无清理率达到100％,中心疏松≤1．0级,中心偏析≤1．0级,中心缩孔≤0．5级,中心碳偏析指数≤1．05,无其他内部质量缺陷,为攀钢生产高速铁路用钢轨提供了合格铸坯。     

大方坯连铸动态轻压下技术应用研究

简述了攀钢引进的奥钢联SMART/ASTC动态轻压下技术及其在重轨钢大方坯连铸生产中的应用效果.生产结果表明铸坯表面无清理率达到100%,中心疏松≤1.0级,中心偏析≤1.0级,中心缩孔≤0.5级,中心碳偏析指数≤1.05,为攀钢生产合格的高速铁路用钢轨铸坯提供了条件.     

高速轨用钢连铸坯内部质量控制的关键技术

简述了攀钢提高350 km/h高速轨用钢连铸坯内部质量的控制技术,包括大方坯连铸结晶器电磁搅拌技术、二冷控制技术和凝固末端动态轻压下技术及其在重轨钢连铸中的应用效果.近3年的生产实践表明,课题研究解决了重轨钢连铸大方坯中心疏松、中心偏析、中心裂纹等内部缺陷较严重的技术难题,重轨钢连铸坯内部质量优异,铸坯收得率达到98.55%,铸坯合格率达到99.97%,铸坯中心疏松≤1.0级,中心偏析≤1.0级,中心缩孔≤1.0级,中心裂纹≤0.5级,中间裂纹≤0.5级,中心碳偏析指数≤1.05,为攀钢开发生产350 km/h高速铁路用钢轨提供了合格铸坯.     

连铸坯轧制300km/h高速重轨的试验研究

应用电炉冶炼→LF精炼→VD脱气→圆坯连铸工艺，连续三次成功地浇注出U71Mn和PD3重轨钢连铸坯，铸坯表面无清理率达到100％，铸坯中心疏松≤1．0级，中心缩孔≤0．5级，中心碳偏析≤1．07，等轴晶率≥40％。由连铸圆坯轧成的重轨，内部质量和力学性能基本达到300km／h高速轨的技术条件要求。     

重轨钢大方坯连铸二冷技术研究

针对攀钢大方坯连铸引进的二冷控制技术在连铸比水量和二冷区水量分配等方面存在的问题,通过测试研究重轨钢的高温延塑性能和二冷区的铸坯表面温度分布,制定了满足攀钢重轨钢连铸工艺要求的二冷控制制度.生产应用表明,重轨钢连铸坯内部质量明显提高,铸坯中心疏松≤1.0级,中心偏析≤1.0级,中心缩孔≤1.0级,中心碳偏析指数≤1.05,中心区域等轴晶率≥30%,由连铸坯轧成重轨的内部质量和力学性能能够满足350 km/h高速铁路用钢轨的要求.     

结晶器电磁搅拌改善重轨钢连铸坯内部质量的试验研究

针对攀钢大方坯连铸机投产初期重轨钢连铸电磁搅拌冶金效果不明显的问题,开展了优化重轨钢连铸结晶器电磁搅拌工艺参数的现场试验,对比研究了电磁搅拌电流对重轨钢铸坯中心疏松、中心偏析、等轴晶率等内部质量的影响,制定了满足攀钢重轨钢连铸工艺要求的电磁搅拌工艺制度.生产应用表明,重轨钢连铸坯内部质量明显提高,铸坯中心区等轴晶率由18.8%增至36.2%,中心疏松≤1.5级,中心偏析≤1.0级,中心缩孔≤1.0级,连铸坯轧成重轨的内部质量和力学性能能够满足时速350 km高速铁路用钢轨的要求.     

重轨钢连铸结晶器电磁搅拌技术应用研究

针对大方坯连铸机投产初期重轨钢连铸电磁搅拌冶金效果不明显的问题,开展了优化重轨钢连铸结晶器电磁搅拌工艺参数的现场试验,对比研究了电磁搅拌电流强度对重轨钢铸坯中心疏松、中心偏析、等轴晶率等内部质量的影响,制定了满足攀钢重轨钢连铸工艺要求的电磁搅拌工艺制度.生产应用表明,重轨钢连铸坯内部质量明显提高,铸坯中心区等轴晶率由18.8%增至36.2%,中心疏松≤1.5级,中心偏析≤1.0级,中心缩孔≤1.0级,中心碳偏析指数≤1.05,连铸坯轧成重轨的内部质量和力学性能能够满足350 km/h高速铁路用钢轨的要求.     

重轨钢连铸坯内部质量控制技术

针对攀钢大方坯连铸机投产初期重轨钢连铸坯中心疏松、中心偏析等内部缺陷较严重的问题,研究应用了提高重轨钢连铸坯内部质量的控制技术,包括凝固末端动态轻压下、结晶器电磁搅拌、二冷动态控制、连铸拉速与钢水温度优化控制等核心工艺技术.生产实践表明,重轨钢连铸坯综合合格率达到99.97%,铸坯中心疏松≤1.0级,中心偏析≤1.0级,中心缩孔≤1.0级,中心裂纹≤0.5级,中间裂纹≤0.5级,角部内裂≤0.5级,中心碳偏析指数≤1.05,由连铸坯轧成重轨的内部质量和力学性能满足时速350 km高速铁路用钢轨的要求.     

重轨钢连铸的质量控制

分析了冶炼、精炼、连铸工艺流程生产高质量重轨钢的工艺技术 ,并应用电弧炉冶炼— L F精炼— VD真空脱气—圆坯连铸工艺成功地浇注出 PD3重轨钢连铸圆坯。铸坯表面无裂纹、气孔、结疤、折迭、凹坑和夹渣等缺陷 ,铸坯表面无清理率 >90 % ,铸坯中心疏松≤ 1.0级 ,中心缩孔≤ 1.0级 ,中心碳偏析指数≤ 1.0 8,等轴晶率≥ 5 0 %。由连铸圆坯轧成的重轨 ,质量和性能基本满足时速 2 0 0 km高速铁路用钢轨的要求。     

15CrMoG钢Ф450mm管坯连铸二冷工艺的优化

建立了15CrMoG钢(％：0．12-0．18C，0．80～1．10Cr，0．40-0．55Mo)弧形连铸Ф450mm圆管坯的二冷工艺模型以优化连铸二冷工艺。生产结果表明，在0．4-0．6m／min拉速下生产Ф450mm15CrMoG钢圆管坯时，采用弱二冷工艺，二冷比水量0．30-0．35L／kg，延长二冷区长度，控制铸坯进入矫直点前表面温度在950℃以上，则铸坯的等轴晶率达47．0％。49．3％，无中心缩孔，近表面和中间裂纹0级，中心裂纹0-0．5级，断面碳偏析△C％为0．02％，硫偏析△S％为0．005％，满足了生产无缝管的铸坯质量要求。     

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.