Φ6.5 mm 60#硬线盘条尖杯状拉拔断裂原因分析

采用金相显微镜和电子探针分析仪等方法对Φ6.5 mm 60#硬线盘条在冷拉拔过程中产生的尖杯状断口进行了分析,发现中心偏析区内有较多夹杂物、负偏析区内有网状铁素体,它们都是裂纹易发点。     

高碳硬线82B 劈裂状断裂原因分析

为探究引起高碳82B盘条劈裂状断裂原因,分析了82B的金相组织、夹杂物、断裂形貌及线材表面特征。结果表明:盘条表面质量缺陷导致拉拔过程中钢丝表面润滑不良、受力不均,引起钢丝表面组织异常,造成钢丝最终产生劈裂状脆断。     

宣钢ER70S-6盘条拉拔断裂原因分析

针对宣钢ER70S-6盘条在拉拔至Φ0.8~1.2 mm时发生断裂问题,对断口进行了宏观形貌、化学成分、夹杂物及显微组织的分析。结果显示,盘条心部形成的马氏体组织经强烈变形后产生严重的加工硬化是导致拉拔断裂的主要原因。同时提出了相应的盘条生产工艺的控制措施。     

SWRM6盘条拉拔断裂原因分析

某线材厂SWRM6的热轧盘条在用户使用拉拔后发生了断裂。通过取样对该盘条进行了断口宏观形貌、金相微观组织、缺陷及电子探针能谱方面的分析,表明断裂盘条的试样边部均存在裂纹,裂纹处有夹渣,夹渣碳质量分数远远高于基体碳质量分数。由于夹渣的存在,一方面因为其塑性较钢材低,在轧制和拉拔时易形成开裂,另一方面由于其富碳层使基体表面增碳,形成索氏体和网状碳化物等异常组织,加速了盘条拉拔时的断裂。     

82B钢盘条拉拔断裂原因分析

对82B钢盘条进行拉拔时发生笔尖状断裂,采用金相光学显微镜和扫描电镜对82B钢盘条进行了非金属夹杂物、显微组织、断口形貌及微区成分能谱分析。结果表明,笔尖状断裂是在盘条中心网状渗碳体及非金属夹杂物的共同作用下产生的。     

一种焊接用钢盘条的拉拔断裂分析

采用酸洗、金相显微镜等分析手段,对焊接用钢盘条在拉拔过程中出现的表面裂纹、脆断等缺陷原因进行分析。结果表明:该盘条拉拔时出现严重的加工硬化,导致出现表面裂纹和断裂现象。     

高碳钢盘条劈丝断裂的原因分析

针对高碳钢盘条在拉拔、合股过程中产生劈丝断裂的情况,取样进行金相及扫描电镜和能谱分析,结果表明,盘条表面有较深的裂纹,裂纹两侧无脱碳,在靠近表面的裂纹两侧有块状渗碳体（Fe3C）;试样断口呈不规则状,试样表面有大量不规则形状的夹杂物,大多数夹杂物中含有Na元素和K元素。综合分析认为,浇注过程中发生了结晶器卷渣,并导致连铸坯局部增碳,使盘条产生了表面碳化物,从而引起劈丝断裂。     

提高SWRH82 B盘条质量的工艺实践

文章采用金相组织检验以及电镜扫描等方法,对拉拔、绞线过程中产生断裂的SWRH82B盘条进行检验,得出引起断裂的原因主要是心部马氏体和夹杂物的存在。另外,生产加工工艺的不合理也是盘条质量较差的一个重要原因。通过改善生产加工工艺,盘条质量明显改善,拉拔断丝现象减少。     

优化原材料质量、提高82B盘条的深加工性能

对使用82B盘条制作钢绞线过程中常见断裂现象进行了归纳总结，分析了导致脆性断裂的原因是由于盘条金相组织异常、存在大型夹杂或者盘条表面严重的缺陷。针对拉拔过程中出现表面裂纹、发生斜权状断裂的原因以及怎样减少断丝率，提出了一些建议。     

ER50-6焊丝用盘条拉拔断裂原因分析

对ER50-6焊丝用盘条拉拔断裂样进行低倍、化学成分、金相、能谱和夹杂物检验分析,结果表明表面裂纹和组织不均匀是引起盘条拉拔断裂的主要原因,并提出改进措施。     

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.