薄板坯连铸连轧低温卷取生产双相钢的工业试验

在薄板坯连铸连轧生产线上,利用微合金元素Nb、Ti析出抑制再结晶发生,加工硬化奥氏体加速铁素体相变,轧后连续快速冷却至低温卷取,利用细晶强化和相变强化生产低成本高强度热轧双相钢。在FTSR生产线上进行工业试验。结果表明,在终轧800～820℃,快速冷却至卷取温度300℃以下,可以得到铁素体和马氏体双相组织,屈服强度400MPa以上,抗拉强度超过650MPa,屈强比低于0.70,伸长率大于20%。     

Nb对Q345系列钢板强韧性的影响

通过加入微合金元素Nb，发挥其在高温变形时推迟奥氏体的再结晶时间，提高奥氏体再结晶温度的作用，轧制工艺上采用控制轧制和控制冷却能有效提高Q345系列钢板的强韧性。采用再结晶控制轧制及非再结晶控制轧制等方法来控制钢板晶粒尺寸，细化晶粒，发挥细晶强化以及析出强化的作用，可以降低钢板的韧脆转变温度。试验结果显示，在钢中加入微合金元素Nb后，通过控制轧制控冷工艺，提高了Q345系列中厚钢板的强度，特别是50％FTT达到-73℃，与Q345B钢板相比降低了48℃。     

Nb含量对GH4169合金组织和拉伸性能的影响

采用真空感应熔炼、锻造、轧制、热处理等工艺得到Nb元素含量分别为4.99%、5.13%、5.34%、5.50%的四种GH4169合金,研究了Nb元素含量对GH4169合金组织和拉伸性能的影响。结果表明:随着Nb元素含量的增加,GH4169合金两组室温屈服强度和抗拉强度的均值分别由1124.5 MPa和1402 MPa提高至1152.5 MPa和1489 MPa,两组650℃屈服强度和抗拉强度的均值分别由867.5 MPa和1035 MPa提高至975.0 MPa和1105 MPa,室温拉伸塑性略有降低,但650℃拉伸塑性几乎无变化,说明Nb元素含量的增加促进了主要强化相γ″的析出和长大,同时金相观察表明同样促进了晶界δ相的析出。     

控轧控冷工艺参数对Nb微合金化高碳钢组织的影响

在Gleeble-1500热／力模拟机上模拟了加热温度、变形温度和冷却速度对含Nb和不含Nb高碳钢组织的影响。试验结果表明，0．71％c钢含0．031％Nb时，原始奥氏体平均晶粒尺寸减少30μm左右，再加热粗化温度由1050℃提高至1175℃以上，变形奥氏体再结晶温度由800℃提高到900℃以上。     

Nb对C Si Mn Cr双相钢相变规律、组织和性能的影响

  根据C Si Mn Cr和C Si Mn Cr Nb实验钢的相变规律,在实验室进行了控轧控冷实验研究,分析了微合金元素Nb对高强度热轧双相钢相变规律、组织和性能的影响。实验结果表明,Nb可显著推迟铁素体和珠光体转变,并显著降低铁素体开始转变温度,但对铁素体终止转变温度和贝氏体转变温度区间基本没有影响。经Nb微合金化后,实验钢的屈服强度和抗拉强度增幅均在100 MPa以上,屈服强度的增幅高于抗拉强度,且在强度大幅度升高的同时,伸长率下降并不明显,表明Nb的细晶强化作用对提高中温卷取热轧双相钢强度级别的效果明显。     

轧制温度制度对一种高强度耐候钢性能影响研究

采用添加Cu,Ni,Cr耐大气腐蚀元素并有效结合Nb,Ti,Mo等微合金元素的成分设计思路,结合控轧控冷技术研制开发了屈服强度达550 MPa的高强度低合金耐候钢.该铜种P含量极低,在保证优良耐大气腐蚀性能的同时有效地保证了焊接性.系统地研究了温度及轧制工艺对钢种综合性能的影响,结果表明合理控制加热温度制度、终轧温度工艺以及卷取工艺制度,能够保证在微观组织上形成超细化铁素体晶粒,通过细晶强化和析出强化等强化机制的结合,在大幅提高强度的同时,保证优异的低温冲击韧性.该钢种的耐大气腐蚀性能与传统耐候钢相当,满足国家相关行业标准要求.     

采用控轧控冷工艺生产车轮用轮辐钢板

通过1700 mm热连轧机组对轮辐钢(%:0.09C、0.12Si、0.98Mn、0.010P、0.005S、0.010Nb、0.04Als)进行830～890℃终轧温度和620～680℃卷取温度的轧制试验。结果表明,板坯加热温度1230～1250℃、终轧温度(870±15)℃、卷取温度(660±15)℃生产的车轮用轮辐钢板的组织为细铁素体加少量的珠光体,屈服强度335～380 MPa,抗拉强度430～485 MPa,伸长率26%～31%,每卷带钢的纵向强度差为13～37 MPa,在车轮制作过程中冲压成型良好,冲废率小于0.3%。     

500 MPa级Nb Ti微合金化方矩形管用钢的强化机制

采用光学显微镜和透射电子显微镜等对500 MPa级Nb Ti微合金化方矩形管用钢的组织与性能进行了分析，研究了其强化机制。结果表明，终轧温度和卷取温度对试验钢的组织和力学性能有显著影响，在研究的温度范围内，终轧温度和卷取温度的降低均有利于获得更加细小的铁素体晶粒与细小弥散的第二相析出物；当卷取温度不变时，随着终轧温度的下降，屈服强度、抗拉强度和断后伸长率均升高；当终轧温度不变时，随着卷取温度的逐渐下降，屈服强度和抗拉强度呈现出先上升后下降的规律，而断后伸长率呈现出单调上升的规律；试验钢在终轧温度为840 ℃和卷取温度为570 ℃时可获得最优的综合力学性能，其屈服强度和抗拉强度分别为537和578 MPa，断后伸长率为33.5%；细晶强化是试验钢最主要的强化机制，由晶粒细化引起的强度增量占总强度的49%～51%，由固溶强化引起的强度增量次之，占总强度的23%～27%，由析出强化引起的强度增量较小，仅占总强度的3.8%～8.2%。     

铌对低碳钢形变板条马氏体组织再结晶的影响

研究了0．05％C-0．12％Nb钢板1200℃固溶，10％冰盐水处理-15％冷轧变形600～680℃时效时Nb对钢中板条马氏体再结晶行为的影响。试验结果得出在600～680℃范围内，Nb能阻止变形马氏体组织的再结晶，时效组织主要为保持板条马氏体位向的回火索氏体，未发现粒状铁素体。该钢在固溶处理 15％冷变形 640℃时效后的屈服强度为712．5MPa，抗拉强度740．0MPa，延伸率邀19．5％，而该钢经固溶处理 640℃时效后的屈服强度为490．0MPa，抗拉强度562．5MPa，延伸率δs22．5％，发现未经15％冷轧变形的0．05％C-0．12％Nb钢在时效过程板条马氏体组织发生明显的相变再结晶，表明时效过程变形能促进Nb的碳氮化物弥散析出，阻止板条-马氏体相变再结晶，从而提高钢的强度。     

热轧温度参数对Nb Ti和Nb V微合金钢力学性能的影响

 设计了650 MPa级的Nb Ti和Nb V微合金钢的化学成分。采用正交实验方法考察了加热温度、终轧温度和终冷温度对这2种钢力学性能的影响。实验结果表明，加热温度和终冷温度是影响Nb Ti和Nb V钢力学性能的主要因素。2种钢的伸长率与屈服强度以及屈强比与屈服强度之间都具有明显的相关关系。     

Acceleration of Electricity Reform Brings Benefit to Big Electricity Users,Aluminum Manufacturers Can Save Costs Up to Several Hundred Million

<正>Recently the National Commission of Development and Reform again assembled experts to solicit opinions,and discussed new electricity reform program.According to information disclosed by experts attending the meeting,in the future electricity reform will undergo top-down design,possibly a     

Qinghai's Aluminum Processing Capacity to Rise at the End of the Year

正Since the release of Implementation Opinions on Carrying out‘Guiding Opinions of the State Council on Resolving Serious Production Overcapacity Conflicts’,according to the actual situation of industry,Qinghai has focused on electrolytic aluminum,cement,ironsteel(including iron alloy and silicon carbide),     

Recent Trends in China's Copper Scrap Market-Part Ⅱ

<正>2.Tianjin Scrap Metal Market In Tianjin,we mainly visited Jinghai Ziy Town scrap market and Binhai New Area’some copper scrap enterprises and enterprise using copper scrap.In Ziya we felt the coppe scrap market was particularly deserted,mos copper scrap enterprises in the town wer closed,industry insiders said in 2012 the plac here was bustling with activity.According to     

Shanghai Clearing House to Roll out Renminbi-denominated Copper Clearing Operations in Free Trade Zone

正Clearing House Financial Markets Co.,Ltd.(Shanghai Clearing House)General Manager Xie Zhong told the media recently at the briefing of the international symposium of"Reform Deepening and Mechanism Innovation of the Post-crisis Kerb Market",Shanghai Clearing House will explore the feasibility of carrying out bond business in     

Development and Application of New Materials for Copper Processing in China

正After over 60 years of developmnt,a system for RD and production of copper processing materials has already taken shape in China.After the reform and opening-up,the application of copper processing materials has gradually expanded from the military industry to civil field.The annual output of copper     

China’s Mineral Exploration Market Downturn Causes Decline of Investment in Bauxite

<正>According to a survey report conducted recently by China Geological Survey Development Research Center,in the first half of 2014,China’s mineral exploration market continued to decline,with the investment in exploration of non-fuel minerals dropping by13.7%and drilling workload dropping by21.7%.According to statistical analysis of the Center,     

Fabricated Copper Production by Province or City in 2014

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Zinc Production by Province in 2014

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China's Aluminum Alloy Cable Market has Taken Shape

正Aluminum alloy cable is a mature product and technology that has been used for nearly fifty years in the U.S.Through six years’promotion,it has been widely recognized and accepted in the China market since 2013,which laid the foundation for the development of the aluminum alloy cable market.Aluminum alloy cable is widely applied in the fields of civil construction and industrial and mining enterprises,especially in real estate,steel and metallurgy.     

Qinghai to Build a 100 Billion Yuan Lithium Industry Base

正At 2014 China Qinghai Trade Fair for Green Development Investment,Qinghai EV Rally2014 was introduced for the first time.With electrical vehicles’eco-friendly features,Qinghai manifested its determination on green development.Introducing Qinghai EV Rally was just a signal.By leveraging its rich salt lake resources