CSP流程生产经济型热轧双相钢的工艺与组织性能

 为了在CSP产线上开发新一代经济型热轧双相钢,并确定生产的最佳成分和工艺,介绍了在武钢CSP生产线进行580MPa级热轧双相钢的工业化生产试制情况。分别采用C-Mn-Si系和C-Mn-Si-Cr系钢为原料,通过控制轧制和基于超强冷却设备的控制冷却工艺,成功开发出抗拉强度580MPa级热轧双相钢。通过比较分析2种成分钢的力学性能和微观组织,结果表明：经济型的C-Mn-Si系钢相对于C-Mn-Si-Cr系钢具有屈服强度低、屈强比小、伸长率大的特点,虽然马氏体量相对较少,但具有马氏体呈岛状更加均匀分布在铁素体晶界上等典型双相钢的特征,同时提出了生产过程中控制铁素体析出量和促进马氏体形成的具体措施。     

酒钢CSP开发540MPa双相钢的可行性分析

本文通过对包钢CSP生产线开发540MPa级热轧双相钢工业试验的了解和分析,对照酒钢设备和工艺条件,对酒钢CSP进行540MPa级热轧双相钢的研发进行了可行性分析。     

首钢热轧DP580双相钢的工业试生产

采用合金成本低廉的C-Mn-Cr化学成分设计,通过层流冷却段的水冷—空冷—水冷的三段式冷却模式和低温卷取,成功在1 580mm机组上试生产580MPa级热轧双相钢。对试生产钢卷进行了性能均匀性分析,结果表明:除去轧钢头部弱冷区域,整卷性能均匀,马氏体比例可稳定在10%左右。进而得出当前采用的恒速轧制方法有利于热轧双相钢力学性能均匀性控制的结论。试生产中在终轧后实施了2种不同的中间温度,轧制结果显示2种工艺方案下屈服强度和屈强比差距较大。     

我国双相钢的研究和进展及今后发展的几点意见

(一)双相钢钢种的研究 我国双相钢钢种的研究已经进入了批量试生产和装车试验阶段。这次会议主要介绍了五个钢种,其成分和性能见表1。 1.Mn-Mo热处理型热轧双相钢 该钢种经760～820℃短时加热后喷雾冷却,获得约10～20％马氏体加铁素体组织。成型后屈服强度可提高176MPa,与08Al相比,冲压汽车脚踏板托架可减轻     

600MPa级热轧双相钢的组织性能

 介绍了实验室使用两段式冷却工艺试制的600MPa级热轧双相钢的化学成分及相变规律,利用光学显微镜、SEM以及拉伸试验对双相钢的微观组织和力学性能进行检测分析。结果表明：试验用钢的Ac1和Ac3分别为785、940℃;经830℃终轧后,空冷10s到750℃,在750℃开始快冷至卷取温度（≤200℃）,可得到室温组织为铁素体（86.5%）+马氏体的热轧双相钢,其屈服强度为327.1MPa,抗拉强度为651.6MPa,加工硬化率高达0.235,伸长率达25.7%。     

700 MPa级热轧双相钢的组织和性能

 采用热模拟并借助光学显微镜、SEM技术研究了双相钢的相变规律及不同工艺参数下的组织演变规律。根据热模拟结果在实验室试制出700 MPa级热轧双相钢,优化了轧制和冷却工艺参数。实验结果表明：热轧双相钢组织为多边形铁素体+马氏体岛,抗拉强度730 MPa,屈强比062,伸长率236%,达到了DP700级双相钢的性能要求,并讨论了热轧卷取温度对双相钢最终力学性能的影响。     

冷却模式对CSP线生产热轧双相钢DP600的影响

针对酒钢CSP线,设计了600 MPa级热轧双相钢的化学成分,测定了其动态CCT曲线.根据动态CCT曲线,分别采用三段式与两段式冷却模式进行了现场试制,对试制热轧板进行了显微组织观察与力学性能检测.结果表明:通过化学成分的合理设计及关键工艺参数的合理控制,热轧板的显微组织为铁素体+马氏体,屈服强度均达到325 MPa以...     

直接热轧双相钢板RS55的研究与开发

本文介绍了５４０ＭＰａ级直接热轧双相钢ＲＳ５５的化学成分、组织、性能和应用。由于采用特殊的控制冷却工艺，ＲＳ５５钢具有双相钢的组织和性能特点；用该钢制成的减重零件组装的汽车已通过扭转疲劳试验。ＲＳ５５钢已投入批量生产和装车使用。     

工艺参数对低碳当量冷轧双相钢相变点和性能的影响

双相钢是汽车减重的重要材料,目前已经获得广泛应用。应用要求双相钢不仅要具有较低的碳当量,还要求在同一抗拉强度级别下有不同屈服强度级别。以低碳当量的980 MPa级试验用钢为研究对象,研究其相变动力学和工艺参数对力学性能的影响,探索通过控制工艺参数来获得双相钢不同屈服强度级别的可能性。     

攀钢成功试制热镀锌双相钢新品种

<正>近日,由研究院、西昌钢钒和鞍钢蒂森克虏伯(重庆)汽车钢有限公司联合研发的1000MPa级低碳当量热镀锌双相钢试制成功。据悉,双相钢具有低屈服强度、高抗拉强度和良好成形性能等特性,广泛应用于汽车结构件和加强件,是目前用量最大的先进高强钢。1000MPa级热镀锌双相钢由于微合金含量高、变形抗力大和镀锌容易漏镀等因素,生产难度极大,能够充分反映     

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.