65Mn带钢分条后开裂原因分析

对作为冷轧窄钢带原料的65Mn宽钢带分条后容易产生开裂的原因进行分析,结果发现夹杂物级别高、中心偏析严重、组织不均匀是造成开裂的主要原因。通过优化工艺、提高材料内在质量,可以防止开裂。     

钢材价格有所回升

当前钢材市场运行基本情况1.产量增幅继续小幅减缓据国家统计局统计,7月份,全国粗钢产量5174.3万吨,比上月下降3.8%,同比增幅回落到2.2%;钢材产量6767.3万吨,比上月下降5.3%,同比增幅回落到9.7%。建筑钢材增幅回落明显。钢筋、盘条本月同比增幅回落到3.9%和4.9%;铁道用钢材继续呈现负增长;厚钢板、热轧薄板、中厚宽钢带、冷轧薄宽钢带、冷轧窄钢带、无缝钢管等继续保持快速增长,增幅仍在20%以上。     

生产工艺对65Mn冷轧宽钢带力学性能的影响

65Mn经热处理后综合力学性能优越,其冷轧钢带用途广泛,可制造弹簧、锯片等。为确定65Mn冷轧宽钢带力学性能随冷轧总变形率变化的规律,对经过不同程度的冷轧后的65Mn冷轧硬态及退火态宽钢带的力学性能进行了研究,研究得出的规律可用于对65Mn冷轧宽钢带力学性能进行预测及指导生产实践。采用65Mn原料经预退火后再进行冷轧的工艺生产的退火宽钢带力学性能稳定,塑性较好。     

冷轧卷尺用钢带生产中的质量控制

冷轧卷尺钢带是江西新余钢铁总厂获国家银质奖的产品。本文从控制带坯质量、压下规程、热处理工艺制度及合理选择辊型4个方面介绍了这种钢带生产中质量控制的经验。文章给出了异步轧制新技术在冷轧卷尺钢带生产中应用的部分数据。     

生产工艺对65Mn冷轧钢带组织性能的影响

对不同生产工艺下冷轧态及退火态65Mn钢带的组织和退火态钢带的力学性能进行了分析。未经退火的65Mn钢冷轧时,珠光体组织以弯曲变形为主,随着总变形率的增加,珠光体弯曲变形减少,片层细化变形成为主要变形方式;经预退火的65Mn钢冷轧时,珠光体组织变形均以细化变形为主。采用原料经预退火后再进行冷轧的工艺生产的65Mn退火钢带组织均匀,力学性能稳定,塑性较好。     

利用综合检测方法杜绝批量钢带厚度超差事故

介绍通过综合检测方法及时检测轧制时钢带纵向厚度是否超差,杜绝批量钢带厚度超差事故给冷轧带来经济损失.     

冷轧钢带表面清洁度的研究

对影响冷轧后钢带表面清洁度因素的分析,通过调整辊表面粗糙度和油品润滑,清洗性能,优化酸洗及轧制工艺参数,控制乳化液浓度,皂化值等主要工艺技术指标,使得冷轧后钢带表面清洁度提高了12%。     

新疆探明潜在地矿资源价值超八万亿

2009年窄钢带产品新增生产线较少,产能变化不大,供求基本平衡,将伴随建筑用钢材市场价格变化而波动。然而在市场低迷时,热轧卷价格低于窄带钢,开平卷替代窄带钢,对带钢市场冲击较大。相对于宽钢带,窄带钢市场走势将伴随宽钢带的市场趋势一同波动。     

日本工业标准 JIS G3141—1973冷轧钢板及带钢

1.适用范围本标准规定,适用于以冷轧机所制成的冷轧钢板及钢带(以下通称钢板及钢带),其中包括冷轧带钢(宽不到500mm的冷轧钢带)及从冷轧带钢切断的钢板。 2.术语意义本规格中所用的主要术语意义如下: (1)钢板:是平面冷轧钢,以平板形状供应。     

22MnB5冷轧边部裂口缺陷分析及控制

文章对22MnB5钢种冷轧边部裂口缺陷的宏观形貌及特殊特性进行了详细描述。利用电子显微镜观察分析了缺陷的微观组织，钢带裂口较多的一侧充斥着大量的贝氏体；边部的晶相组织与钢带中间位置有很大的区别，推断出导致裂口产生的根本原因是钢带宽度方向上组织不均，组织不均导致在冷轧加工过程中钢带受力不均，从而使钢带边部撕裂，产生边部裂口缺陷。利用便利的信息化条件对冷、热轧的生产过程进行了还原，通过数据收集和分析找出缺陷产生的可能原因。再通过生产试验对冷轧压下率进行了调整，对热轧层冷冷却过程包括层冷水温度、超快冷喷嘴等进行了综合调整。经过冷轧、热轧联动调整后，大大降低了缺陷发生的概率，保证了冷轧产线生产过程的稳定。     

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.