高速钢辊环的研究和应用

研究了高速钢成分、离心铸造工艺参数和复合变质处理对高速钢辊环性能的影响。结果表明 ,选择高V高Nb并经Y—K—Na复合变质处理的高速钢 ,在离心铸造条件下制造的辊环 ,具有成分偏析小、硬度高、硬度均匀等特点 ,用于高线预精轧机 ,其使用寿命比常用的合金铸铁辊环提高5～8倍     

高速钢辊环的研制及应用

目前线材轧机常用的合金铸铁辊环耐磨而硬质合金辊环成本较高。为此,采用离心铸造方法,季耐磨性能优良的高速钢辊环,其硬度达ＨＲＣ６３－６５,辊面硬度差小于ＨＲＣ２,冲击韧性大于１６Ｊ／ｃｍ＾２。用于线材轧机预粗轧段,使用寿命比合金铸铁辊环提高６１０倍,接近了硬质合金辊环的水平,着重介绍了高速钢辊环的离心铸造和热处理的主要工艺,并对降低高速钢辊环的偏析和铸造裂纹等改善调整钢辊环质量的工艺进行了探讨。     

高速钢复合辊环离心铸造技术研究

高速钢具有硬度高和红硬性好等特点，适合于制造轧钢机辊环，普通离心铸造高速钢辊环工艺简单，操作方便，但辊环内孔硬度高，加工困难，而且合金用量大，成本高，研究了高速钢／球墨铸铁离心复合铸造辊环工艺，对影响复合层质量的因素进行了分析，金属浇注温度和浇注间隔时间是影响复合层质量的关键因素，严格控制离心铸造工艺参数和注注中加入助溶剂，得到了复合层结合良好的辊环，高速钢淬火温度高，降低内层力学性质，通过改进成分，获得的高速钢辊环铸态直接回火后，硬度达HRC64。     

离心铸造高速钢辊环的研制

研究了高速钢成分、离心铸造工艺参数和复合变抽处理对高速钢辊环性能的影响。结果表明,选择高Ｖ高Ｎｂ并经Ｙ－Ｋ－Ｎａ复合变质处理的高速钢,在离心铸造条件下制造的辊环,具有成分偏小、硬度高、硬度均匀性好等特点,用于高线预精轧机、其使用寿命比常用的合金铸铁辊环提高５～８倍。     

高速钢辊环的研制与应用

常用合金铸铁辊环耐磨性低，而硬质合金辊环成本高，采用离心铸造方法，开发了耐磨性能优良的高速钢辊环，高速钢辊环的硬度达63—65HRC，辊面硬度差小于2HRC，冲击韧性大于16J／cm^2。用于线材轧机预精轧机，使用寿命比合金铸铁辊环提高6—10倍，接近硬质合金辊环水平。     

离心铸造复合高速钢辊环的研制

采用离心复合铸造工艺研制复合高速钢辊环。研制结果表明,选用变质高碳无钴高速钢作外层,用球铁作内层,选择合适的离心机转速、两种金属液浇注的间隔时间和浇注温度,并结合采用表面感应热处理工艺,可获得硬度高,硬度均匀性好,内外层结合良好的高速钢复合辊环,用于工业生产,其使用寿命比高铬铸铁辊环提高５倍以上。     

离心铸造高速钢轧辊的研究及其在棒线材轧机上的应用

由于普通合金铸铁轧辊硬度低、耐磨性差，而硬质合金轧辊尽管具有优异的耐磨性，但成本高，且脆性大，使用中易开裂和剥落。故以高碳高速钢为主要合金成分，采用离心铸造方法，开发了耐磨性能优良的高速钢轧辊，并着重解决了离心铸造高速钢轧辊生产过程易偏析和产生裂纹的难题。高速钢轧辊硬度达63～65HRC，辊面硬度差小于2HRC，冲击韧性大于14J／cm^2。用于高速线材轧机预精轧机组和棒材轧机精轧机组，使用寿命比合金铸铁轧辊提高6～10倍，接近硬质合金轧辊水平。     

高速钢挤压铸造工艺的研究和应用

试验结果表明,提高比压和延长保压时间可显著降低成分（%）为4.5-8.5w,5.0-8.0Mo,3.5-5.5Cr,1.5-2.5V高速钢的缩孔。用挤压铸造技术制造的高速钢辊环,其各项性能指标明显优于重力铸造和离心铸造高速钢辊环。     

离心铸造高速钢轧辊偏析控制技术研究

偏析严重影响高速钢轧辊组织和性能,离心铸造高速钢轧辊偏析的主要原因是高速钢熔液中存在密度不同的原子簇团。首次采用单辊激冷制带设备制备了高速钢薄带,并对激冷薄带进行X射线衍射分析,发现高速钢熔液中存在原子簇团,提出了改变原子簇团在离心力场的移动规律和提高凝固冷却速度,有利于减轻离心铸造高速钢轧辊偏析,改善高速钢轧辊性能。     

高铬铸铁辊环的研究与应用

对锻轧机辊环的化学成分进行了科学设计，对辊环的离心铸造工艺、软化退火工艺、淬火工艺和回火工艺进行了深入研究。结果表明，新研制的辊环硬度高、硬度均匀性好，耐磨性好，使用安全、可靠，使用寿命已达到进口辊环的水平。     

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.