冷轧工作辊的早期失效及预防措施

讨论了冷轧工作辊接触疲劳裂纹、剥落、夹杂物裂纹和磨损等失效形式。指出冷轧工作辊早期失效三要形式为剥落，其原因为局部过热和过载。使用轧辊时定期磨削去除微裂纹和表面无损探伤是提高轧辊使用寿命的关键措施。     

70Cr3Mo精轧支承辊剥落原因探讨

对７０Ｃｒ３Ｍｃ精轧支承辊大面积剥落的失效破坏情况进行了较为深入的分析。阐明了轧辊内部存在的缩孔、气囊及热处理不当缺陷是造成轧辊剥落的主要原因。通过对支承辊工作条件下交变弯曲应力、接触应力的计算，揭示了支承辊剥落的疲劳失效实质。     

浅析铸造热轧带钢工作辊的剥落与断裂失效

本文论述了在热轧带钢生产过程中工作辊剥落和断裂失效的主要形式,分析了其产生的主要原因,并针对每一种失效形式提出了具体的改进方法和预防措施。     

高铬铸铁工作辊的主要失效形式有哪些?

高铬铸铁轧辊主要用于热带钢连轧机和中厚板轧机,其主要失效有裂纹、剥落、断辊和氧化膜脱落。裂纹的形成主要与卡钢、打滑、跑偏等轧制事故以及接触疲劳有关。剥落主要有两种形式：一是轧辊表面裂纹引起的剥落。轧制过程中,由于热冲击在辊面产生裂纹并扩展;或磨削后辊面存在残余裂纹,在随后上机轧制时裂纹扩展;     

热轧带钢精轧工作辊的剥落失效与预防

论述了在热轧带钢生产过程中工作辊剥落失效的主要形式,包括马鞍形剥落、带状疲劳剥落、结合层处脱落、辊肩脱落等。采取措施避免轧辊产生应力集中和轧制过载、避免轧制事故如带钢与轧辊粘钢、以及制定合理的轧辊俢磨工艺、减少轧辊材料中的夹杂物等。从而为建立良好的轧辊利用和管理制度提供建议,以消除剥落,提高轧辊使用寿命。     

冷连轧中间辊剥落原因分析

某厂中间辊上机使用后发生整个辊身的剥落,脱壳.通过金相组织、硬度检测等方法对该支轧辊进行了失效分析,认为中间辊的剥落原因是支承辊卡死后与中间辊发生滑动摩擦、烧伤引起的表面大面积龟裂.其结论对中间辊的失效分析和使用维护具有重要的指导意义.     

热连轧铸造花纹辊失效分析及预防措施

本文根据目前热连轧花纹辊使用过程中花纹剥落、开裂、高度不均等失效形式,分析了其产生原因、形成机理,完善了缺陷预防的管理制度。     

冷轧工作辊的失效与修复利用

剥落、粘辊和裂纹是冷轧工作辊失效的重要原因之一。武钢一米七冷轧机和单、双平整机是从西德引进的现代化轧机,其轧制压力最大可达到2500吨,轧制速度可达30米/秒。由于冷轧辊在轧制过程中经受复杂的应力作用和各种事故的考验,所以其失效形式亦各不相同。     

9Cr2Mo冷轧工作辊辊面剥落的失效分析

利用光镜和扫描电镜对工作辊剥落断口进行了观察分析,工作辊辊面失效的产生是由于工作辊内部的显微裂纹,形成应力集中,降低了材料的断理解韧性,造成辊子表面剥落失效。     

对冷轧辊实行特殊处理可以提高使用寿命

冷轧辊的剥落失败历来是影响和制约冷轧厂效益提高的主要因素。本文就剥落失效的机理、特殊处理方法，及使用效果做了全面阐述。     

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.