共查询到20条相似文献,搜索用时 140 毫秒
1.
2.
3.
4.
包钢轨梁厂新建成的万能式重轨及型钢生产线,万能轧机由德国西马克引进,轧机机组布置密集,单件形体大,安装标准要求高,部分设备天车不能直接吊装到位.文章简要阐述其安装过程并对一些难点进行剖析,以供同行借鉴. 相似文献
5.
6.
阐述了我国国民经济的发展对重轨和大型钢材的需求与对策。提高重轨质量和单重以增加列车载重和车速,扩建现有轨梁轧机,可以满足2000年前需要。大型材轧机的生产能力不足,必须建设新的万能型钢轧机和择优改造650轧机以配套生产大、中、小H型钢。应加快建设马钢的H600万能型钢机组。 相似文献
7.
文章从预弯参考曲线、标度转换、信号转换等几方面介绍了轨梁厂百米重轨预弯的控制策略设计以及预弯控制系统的系统设计及实现,通过本系统的应用实现了钢轨的精确预弯功能,满足了百米重轨在进入矫直机前的工艺要求。 相似文献
8.
叙述了我国热带钢轧机之立辊轧机、调(定)宽压力机、轧机的弯辊装置、轧辊横移轧机、轧辊交叉轧机、热卷箱、轧机布置技术及薄板坯、中薄板坯技术应用和发展情况。 相似文献
9.
运用实验室重轨万能轧机,采用轧制铅试样的方法对CCS万能轧制机组进行实验室模拟,结果表明轨腰和轨底的前滑值随轨腰压下率的增加而增大。 相似文献
10.
11.
中国加快了高速铁路建设,铁路建设需要大量的钢轨,为了把握住铁路大发展、重轨销售形势良好的时机,提高重轨实物质量水平,满足市场对重轨的需求,2007年,包钢将重轨降级品改判为废品,同时针对重轨的主要缺陷采取了有效的控制措施,重轨质量得到提高,扩大了市场份额,产生了较高的经济效益。 相似文献
12.
13.
高速铁路用钢轨生产技术 总被引:2,自引:0,他引:2
采用铌稀土(BNbRE)钢种,进行了钢的高纯净度、无缺陷连铸坯、高精度轧制、在线检验及相关技术研究,形成高级别钢轨生产工艺.结果表明:生产的钢轨能够满足<时速200公里客运专线60 kg/m钢轨暂行技术条件>的技术指标. 相似文献
14.
针对包钢生产350 km/h高速U71Mn钢轨钢w[N]偏高的问题,研究指出了高速轨钢液增氮的主要原因。采用无烟煤替代沥青焦作为增碳剂,钢液w[N]均低于65×10^-6。有效控制了钢中w[N]。 相似文献
15.
16.
Progress of Study on Application of Rare Earth Metals in Steels 总被引:1,自引:0,他引:1
With the improvement of the clean steel by degrees, the functions of rare earth metals in steel are more focused on modification of inclusions and micro alloying.The new study concerning the application of RE metals in clean steels were investigated by ICP, metallographic examination, SEM, EDS, EPMA, TEM and IMMA.The mechanism of corrosion resistance in the weather resistance steel was clarified.The mechanism of abrasion resistance and the life of fatigue enhanced in the RE - heavy rails steel were discussed.Progress in study of application of rare earth metals in steels (including weather resistance steel, low alloy steel, and heavy rails steel) was covered in this paper. 相似文献
17.
T. Jokiaho A. Laitinen S. Santa-aho M. Isakov P. Peura T. Saarinen A. Lehtovaara M. Vippola 《Metallurgical and Materials Transactions B》2017,48(6):2891-2901
Heavy steel plates are used in demanding applications that require both high strength and hardness. An important step in the production of such components is cutting the plates with a cost-effective thermal cutting method such as flame cutting. Flame cutting is performed with a controlled flame and oxygen jet, which burns the steel and forms a cutting edge. However, the thermal cutting of heavy steel plates causes several problems. A heat-affected zone (HAZ) is generated at the cut edge due to the steep temperature gradient. Consequently, volume changes, hardness variations, and microstructural changes occur in the HAZ. In addition, residual stresses are formed at the cut edge during the process. In the worst case, unsuitable flame cutting practices generate cracks at the cut edge. The flame cutting of thick steel plate was modeled using the commercial finite element software ABAQUS. The results of modeling were verified by X-ray diffraction-based residual stress measurements and microstructural analysis. The model provides several outcomes, such as obtaining more information related to the formation of residual stresses and the temperature history during the flame cutting process. In addition, an extensive series of flame cut samples was designed with the assistance of the model. 相似文献
18.
重轨钢的炉外精炼与连铸 总被引:6,自引:1,他引:5
论述了重轨钢真空处理的必要性及国外重轨厂家采用真空处理的现状。对用连铸坯轧制重轨的优点及重轨钢连铸工艺特点作了说明,介绍了国外改善连铸方坯质量的措施和用连铸坯轧制重轨的主要厂家。 相似文献
19.
20.
为提高宽度测量精度,济钢中厚板厂2500产线在粗轧机前安装在线自动测宽系统,该系统主要由CCD器件、视频自动增益控制器、图像采集卡、工控计算机等组成。系统应用后,可实时测量轧制过程中钢板宽度,便于随时调整压下量,提高了长宽定尺板合格率,成品切边放尺量减少了4 mm,产品改判率降低0.02%。 相似文献