薄板坯连铸连轧流程低碳铝镇静钢组织细化的原因

薄板坯连铸连轧流程生产的低碳Al镇静钢普遍存在组织偏细，强度偏高的现象，这为高强度带钢生产提供了有利条件，但也为冷轧基料生产带来了一定的困难。国内外已对薄板坯连铸连轧流程生产的低碳Al镇静钢组织细化原因进行了大量的分析和研究，得到了一些认识。本研究表明，薄板坯连铸出坯后已有AIN沉淀析出，经均热后仍有约0．0030％的AIN未溶解。这些AIN微细沉淀对抑制奥氏体再结晶晶粒长大、抑制相变铁素体晶粒长大起到一定作用，使钢带组织细化；另外，薄板坯连铸连轧流程轧后冷却段长度偏短，冷却强度偏高也是造成组织细化，强度偏高的主要原因。     

薄板坯连铸连轧流程低碳Al镇静钢组织细化原因探讨

研究了薄板坯连铸连轧流程生产的低碳Al镇静钢普遍存在的组织偏细,强度偏高的问题。研究结果表明,薄板坯连铸出坯后已有AlN沉淀析出,经均热1 423 K×30 min后仍有约30×10-6AlN未溶解。这些AlN微细沉淀对抑制奥氏体再结晶晶粒长大、抑制相变铁素体晶粒长大起到一定作用,使钢带组织细化;另外,薄板坯连铸连轧流程轧后冷却段长度偏短,冷却强度偏高也是造成组织细化,强度偏高的主要原因。     

薄板坯连铸连轧流程V微合金化技术研究

本文基于薄板坯连铸连轧流程物理冶金特征,系统地研究了V的析出规律和V微合金钢的强化机理.结果表明,均热前铸坯中有大量细小V析出物,均热过程中部分析出物溶解,颗粒略有长大;铸坯中的细小析出物对抑制变形奥氏体再结晶晶粒长大有明显的作用,使试验钢具有晶粒尺寸为3～4μm的超细晶组织;组织超细化是导致薄板坯连铸连轧流程V微合金钢强度提高的主要原因.采用薄板坯连铸连轧流程V微合金化技术开发了屈服强度550MPa级HSLAS-F80高强钢,其组织均匀、晶粒超细化、强度高、成型性能和焊接性能优良.     

低碳铝镇静钢中AlN的沉淀析出

 利用热处理和化学相分析对薄板坯连铸连轧低碳铝镇静钢中AlN的沉淀析出行为进行了试验研究。结果显示,在薄板坯连铸连轧的低碳铝镇静钢中仅有很少量的氮被固定为AlN,大部分氮仍为自由氮,其原因是在薄板坯连铸连轧流程中的连铸出坯、均热、连轧和层流冷却等阶段,AlN在钢中很少沉淀析出。在热轧钢板卷取后的缓慢空冷过程中可以沉淀析出少量的AlN,这些AlN不能起到细化晶粒的作用。     

珠钢电炉-薄板坯连铸连轧流程VN微合金钢组织性能研究

阐述了珠钢电炉-薄板坯连铸连轧流程VN微合金钢钒的析出规律、微观组织特征和强化机理。研究表明：在电炉-薄板坯连铸连轧流程采用VN微合金化,铸坯中析出以钒（C,N）为主,并有少量TiN或（Ti,V）（C,N）复合析出,平均粒度大约为40nm,热连轧开始前铸坯中大量存在的钒（C,N）能够抑制后续热连轧过程中变形奥氏体再结晶晶粒长大,使铁索体组织超细化;强化机制以细晶强化为主、沉淀强化为辅;采用VN微合金化技术开发的550MPa级VN微合金钢组织细化至3．0—4．0μm,产品具有良好的综合性能。     

对薄板坯连铸连轧技术的客观分析

与传统连铸相比,薄板坯连铸在铸坯厚度、浇铸速度、铸态组织、在线连轧等方面都发生了很大变化,既具有冷却强度大、生产线占地少、能耗低等优点,也具有表面质量不高、产品适应范围较小等缺点。文中就薄板坯连铸产品组织、化合物析出、产品的适应性等方面的优缺点进行了分析比较,客观实际地薄板坯连铸连轧生产技术进行了评价。     

对薄板坯连铸连轧技术的客观分析

与传统连铸相比,薄板坯连铸在铸坯厚度、浇铸速度、铸态组织、在线连轧等方面都发生了很大变化,既具有冷却强度大、生产线短、能耗低等优点,也具有表面质量不高、产品适应范围较小等缺点.对薄板坯连铸产品组织、化合物析出、产品的适应性等方面的优缺点进行了分析比较,以便客观实际地评价薄板坯连铸连轧生产技术.     

对薄板坯连铸连轧技术的分析

与传统连铸相比,薄板坯连铸在铸坯厚度、浇铸速度、铸态组织、在线连轧等方面都发生了很大变化,既具有冷却强度大、生产线短、能耗低等优点,也具有表面质量不高、产品适应范围较小等缺点.近年来我国薄板坯连铸连轧技术发展较快,已建成十几条生产线,但对其生产情况褒贬不一.通过对薄板坯连铸产品组织、化合物析出、产品的适应性等方面的优缺点进行分析比较,客观地评价了薄板坯连铸连轧生产技术.     

CSP流程VN微合金钢的冶金学特征

在薄板坯连铸连轧生产中，微合金元素的溶解与析出过程，以及微合金元素与变形奥氏体再结晶、γ-a相变间的关系与传统厚板坯连轧有较大的差异，这为薄板坯连铸连轧流程生产微合金钢带来了一定的困难。研究表明，V～N的冶金学特征比较适合于CSP技术的特定工艺流程。对0．05％C—1.5％Mn-0．12％V-0．020％N钢，连铸出坯后已有大量微细V（CN）析出，均热后仅有部分沉淀溶解。这些铸坯中的微细沉淀对抑制变形奥氏体再结晶晶粒长大有十分重要的作用。在工业试生产中，铁素体晶粒尺寸为3～4pm的V—N微合金化超细晶粒钢已经试制成功，在CSP流程V—N微合金钢中，V的沉淀强化作用也显著提高了试验钢的强度水平。通过对VN微合金钢的超细组织控制和沉淀强化控制，在CSP流程上可生产屈服强度达550MPa级的低碳贫珠光体高强度钢。     

薄板坯连铸连轧钢的组织性能综合控制理论及应用

在对国内外薄板坯连铸连轧工艺及产品开发现状及发展趋势分析的基础上,通过大量的试验研究提出了连铸连轧组织性能综合控制的概念,对钢中夹杂物超细化,锰和硫的控制,热连轧过程中的再结晶、组织细化及沉淀析出,层流冷却过程特征及对组织性能的影响以及柔性轧制工艺控制进行了研究分析,给出了通过组织性能综合控制得到的高性能低碳高强钢板（HSLC）在汽车上应用的实例。     

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.