热轧1780上表中部氧化铁皮研究及控制方法

结合梅钢热轧1780氧化铁皮缺陷,分析热轧生产过程对中部表面一种氧化铁皮产生原因进行分析。通过轧制实验与统计,对缺陷主要影响因素进行分析:轧辊氧化膜的形成剥落和带钢温度情况、轧辊冷却水分布、精轧除鳞系统影响以及对防剥落水的要求,研究中部铁皮产生原因,提出可行的控制方法,最终解决梅钢1780上表中部氧化铁皮缺陷。     

连退板残留氧化铁皮形貌与控制措施

通过现场跟踪与扫描电镜，分析了新钢残留氧化铁皮形貌在酸洗冷轧与连退后的变化特征，得出了条状与点状氧化铁皮是缺陷的主要形式，指出了热轧精轧区除鳞不良及二次氧化铁皮是连退板残留氧化铁皮形成的主要原因。通过加强除鳞设备维护，提高精轧区轧制速度，新增精轧机架除鳞水等措施，有效减少了连退板残留氧化铁皮的产生。     

热连轧带钢表面氧化铁皮种类及控制

结合某钢厂热连轧线的生产实践,分析热连轧带钢表面氧化铁皮缺陷的种类和产生原因。通过调查、统计与试验,针对氧化铁皮缺陷的主要影响因素：轧线除鳞设备故障、开轧轧辊氧化膜未建立、轧制单位尾部轧辊氧化膜脱落、加热烧钢温度或轧线轧制温度过高等,提出可行的控制措施,使冷轧基料氧化铁皮月改判率基本控制在0.1％以下。     

热轧带钢氧化铁皮形貌及控制措施

介绍了唐山建龙特殊钢有限公司热轧带钢氧化铁皮缺陷的特点并分析了其产生的原因,认为加热温度、加热时间、除鳞设备等因素对热轧中宽带氧化铁皮的产生影响较大。通过控制精轧开轧温度、板坯加热时间、定期检测除鳞距离、保证除鳞压力等措施,使氧化铁皮缺陷得到有效控制,带钢表面质量明显改善。     

轧制工艺对高强耐候钢表面氧化铁皮的影响

某钢铁企业开发铁道用高强耐候钢Q550NH,生产中存在的主要问题为钢卷表面存在大面积红锈状氧化铁皮及柳叶状氧化铁皮压入缺陷.通过采取调整在炉时间、除鳞道次、粗轧出口温度、热卷箱模式等轧制工艺参数,研究了高强耐候钢表面氧化铁皮解决方法.通过提高粗轧出口温度,红锈状氧化铁皮消失;控制粗轧出口温度,缩短在炉时间,增加除鳞道次...     

运用质量管理方法控制热轧卷氧化铁皮的发生

介绍了因板坯在加热过程中的温度控制和钢带在轧制过程中除鳞控制的问题,造成产生带钢表面氧化铁皮缺陷,严重影响产品的质量。但热轧大生产条件下无法全数检验,必然有带缺陷的钢卷流入市场,产生质量异议。因此采取了将氧化铁皮的控制重点转移到生产工艺的控制上来,从温度控制和除鳞控制入手,利用先进的质量统计技术和质量管理手段寻找出切合实际的精轧入口温度和除鳞压力标准,减少产生热轧钢卷表面氧化铁皮缺陷,提高产品质量,使产品具有较强的市场竞争力。     

钢板表面氧化铁皮缺陷形貌及产生原因分析

通过扫描电镜、能谱仪和XRD衍射仪等相关试验手段对带钢表面氧化铁皮缺陷外貌形态、微区成分进行了试验分析,并对氧化铁皮缺陷产生的原因进行了研究.结果表明带钢的氧化铁皮缺陷主要有四种:①板坯出炉后未被高压水除鳞箱清除干净的粗轧时产生的一次氧化铁皮缺陷;②精轧前未完全被高压水除鳞而残存的二次氧化铁皮压入缺陷;③精轧过程中及随后的冷却过程中辊面氧化膜磨损造成热轧钢卷表面形成的三次氧化皮;④红色氧化铁皮的产生,主要是由于钢坯加热过程中表面氧化物与基体金属产生强烈啮合所致,大部分发生在高硅含量等特定的钢种上.     

热轧板带钢氧化铁皮产生原因及控制

对热轧工序炉生氧化铁皮、二次氧化铁皮、三次氧化铁皮及非常规条件产生的氧化铁皮的影响因素进行了详细分析,并制定了有效控制措施。对于炉生氧化铁皮,通过合理制定加热工艺,加热温度主体控制在1 150～1 250℃范围内,调整空燃比炉压微正压,防止炉头炉尾吸冷风或冒火等,烧损率降低至0.6%;对于二次氧化铁皮缺陷,通过降低开轧温度至1 060～1 100℃,中间坯厚度≤28 mm,并保证除鳞压力不低于20 MPa及粗轧辊辊面质量,可以明显改善缺陷;对于三次氧化铁皮,采取低温快轧可以减薄钢带表面氧化铁皮厚度,利于冷轧酸洗;降低卷取温度至590℃,可以改善边部红锈缺陷。提高生产设备管控水平,尤其是改善精轧前与轧件接触的设备状况,可以显著降低非常规氧化铁皮压入缺陷,减少协议品量。     

热轧带钢表面麻点缺陷研究及对酸洗影响分析

针对热轧带钢表面存在的麻点缺陷,利用扫描电镜（SEM）和能谱仪（EDS）分析了麻点缺陷的形貌与元素构成,并在实验室进行了模拟酸洗试验。结果表明：麻点缺陷表现为氧化铁皮脱落和压入,一方面因Mn含量控制不当导致氧化铁皮脱落,另一方面粗轧过程中除鳞不彻底导致精轧过程中氧化铁皮压入,两者综合导致了麻点缺陷的产生。麻点缺陷在酸洗后会在带钢表面留下凹坑,且凹坑可能会保留到冷轧板上,在冷轧时造成轧辊氧化膜脱落,形成新的氧化铁皮压入缺陷,影响钢卷表面质量。     

轧制工艺对热轧钢板表面氧化铁皮的影响

采用扫描电镜(SEM)对不同颜色的氧化铁皮部位进行表面形貌和氧化铁皮厚度观察,同时检测钢板的力学性能,研究了轧制工艺对热轧钢板氧化铁皮的影响。结果表明:在保证钢板性能合格的前提下,适当提高终轧温度,可以改善氧化铁皮的塑性;优化轧制过程的除鳞制度,可以减薄终轧道次氧化铁皮的厚度。     

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.