高疲劳机械臂用Q345FCAD钢的开发

介绍了工程机械用Q345FCAD疲劳钢板的研发过程,研究了其微观组织、力学性能及疲劳性能。结果表明,Q345FCAD组织类型为铁素体+珠光体,晶粒度为11级;钢板的拉伸和冲击性能均满足技术指标(YB/T 4570-2016)要求且余量充足;钢板的疲劳强度为307 MPa,疲强比不低于0. 55,钢中的夹杂物尺寸很小,疲劳源均出现在基体表面,没有出现因钢中夹杂物成为疲劳源而断裂的情况。     

热风炉悬链线形拱顶应用与施工

一、前言邢台钢铁厂300m~3高炉工程,热风炉拱顶采用悬链线形拱顶,也叫霍戈文蘑菇曲线拱顶,其形状近似于一根有重量的定长柔索两端固定,在自身重量作用下,柔索所构成的悬链曲线。如果按霍戈文蘑菇曲线拱顶砌筑,需用十分复杂的砖形,给耐火制品制作和砌筑带来困难。如何简化砖形,使砌筑的拱顶又能近似悬链线型,一般采用多段圆弧线形代     

热风炉悬链线拱顶的模拟及计算

介绍了热风炉悬链线拱顶的特点，悬链线拱顶的模拟以及计算方法。     

KD级抽油杆用钢23CrNiMoV的力学性能和耐蚀性

试验结果表明，新型ＫＤ级抽油杆用钢２３ＣｒＮｉＭｏＶ的腐蚀疲劳和力学性能，均达到了ＫＤ级用钢２２ＣｒＮｉ２ＭｏＣｕ的水平。     

X60钢级管线管热处理工艺研究

文章介绍了X60钢级管线管的成分设计及生产工艺过程,重点研究了热处理工艺,通过对试验结果的分析,得出采用调质工艺(淬火+回火)处理,管线管的力学性能完全满足相关标准要求。     

高炉热风炉悬链线拱顶砖计算软件开发

本文介绍了高炉热风炉悬链线拱顶砖多段圆弧拟合计算新方法,用计算机语言编程计算砖的尺寸,砖的层教,每层砖的类型、数量,每层砖组合误差等,并用C#编写界面.提高热风炉拱顶砖计算精度,减少了设计计算时间,便于使用.     

含稀土高强抽油杆用钢的开发与生产

利用独有的稀土资源特色,包钢成功开发了具有自主知识产权的含稀土高强抽油杆用钢,与常用的铬钼系钢种相比,其成本有较大幅度的降低。热处理后的钢材,屈服强度平均为996 MPa,抗拉强度平均为1 086 MPa,延伸率平均为15.5%,面缩率平均为58.3%,冲击功平均为114 J,其热处理性能达到H级抽油杆的技术要求,而且疲劳寿命达到500万次不断。制成的抽油杆产品出口到加拿大,并在国内部分大型油田下井使用,获得了国内外用户的普遍认可。     

电加热冒口铸钢辊凝固过程数值模拟及优化

为提高某铸钢轧辊的工艺出品率,节约能源消耗,本研究针对该轧辊铸造过程进行数值模拟,依据无损探伤缺陷位置确定合理的换热边界换热条件,再现了缩孔缩松的位置,并评估了冒口降低的可行性。结果表明,在冒口上表面换热系数为2.4 W/(m2·K)、发热效率为25%时,该铸钢辊的缺陷模拟结果与实际探伤结果最为接近。基于此,当减小冒口高度低于100 mm时,铸件本体内凝固缺陷并未加重;而当冒口减少高度超过150 mm时,冒口内部凝固缺陷有进入铸件本体的风险。     

Development of electrical steel production

Novolipetsk Metallurgical Plant. Translated from Metallurg, No. 10, pp. 21–23, October, 1994.     

彩涂机组垂度控制系统优化

介绍了彩涂机组生产的概况以及实际生产中垂度控制的诸多影响因素。采用悬链线法对静态垂度和动态垂度进行计算分析,以实例形式介绍了运行带钢垂度的动态控制系统。同时针对彩涂机组实际生产中突出的带钢擦划伤问题,对垂度控制系统进行了适当的改进,将前馈控制的思想应用到了垂度系统中,从而极大地提高了动态垂度的控制精度和稳定性,消除了炉内带钢擦划伤。该垂度控制系统具有通用性和可移植性。     

超级奥氏体不锈钢的发展

日益增长的工业需求推动着超级奥氏体不锈钢的研发,以研发时间为序阐述超级奥氏体不锈钢3个发展阶段。第1个阶段主要是为解决硫酸介质环境的耐腐蚀性而开发的不锈钢;第2个阶段是在第1阶段研发钢的基础上添加质量分数约为0.2%的N元素、并将Mo元素质量分数增加到约6%而研发的几种耐腐蚀性能良好的超级奥氏体不锈钢;第3个阶段是在6%Mo钢的基础上将Cr、Mo、N含量都进行较大幅度的提高,其中Mo元素质量分数增加到约7%,N元素质量分数控制在0.5%左右,并加入适量Mn元素而研发出耐腐蚀性优异的超级奥氏体不锈钢。阐述了超级奥氏体不锈钢研发过程中的2个重要技术,即炉外精炼与氮合金化技术,并展望了超级奥氏体不锈钢的未来发展及推广应用。     

Optimal riser design for metal castings

The optimal design of a casting rigging system is considered. The casting geometry is systematically modified to minimize the gate and riser volume, while simultaneously ensuring that no porosity appears in the product. In this approach, we combine finite-element analysis of the solidification heat-transfer process with design sensitivity analysis and numerical optimization to systematically improve the casting design. Methods are presented for performing the sensitivity analysis, including the sensitivity of important solidification parameters such as freezing time, temperature gradient, and cooling rate. We also present methods for performing Newton-Raphson iteration for solidification models that use the boundary-curvature method to represent the sand mold. Finally, the methods are applied to design risers for an L-shaped steel plate to control microporosity and for a steel hammer to control macroporosity. It is demonstrated that the size of a conventionally designed riser can be reduced by a significant amount while retaining the quality of the cast product. Formerly Graduate Student, Department of Mechanical and Industrial Engineering, University of Illinois     

Development of non-quenched and tempered bolt steel

The 8.8 grade non-quenched and tempered bolt steel was studied according to the process conditions of wire rod plant and customer requirments.Three types of experimental steel grades were selected.10MnSiTi Nb and 20Mn2VTi(N) were chosen as the formal steel after several experimemts.     

绿色钢铁产品认证发展现状

通过分析国内外绿色钢铁产品认证的发展背景及现状,详细讨论了我国绿色制造体系,绿色钢铁产品相关标准和认证体系的发展历程和现状,介绍了以欧洲、美国和日本为例的绿色钢铁产品相关的认证体系。同时,通过国内与国外绿色钢铁产品认证体系发展历程和现状的对比,指出了我国现在还需要进一步优化相关绿色制造政策法规,完善绿色制造钢铁行业标准体系和认证评价体制,推进绿色低碳技术升级和强化人才培养体系建设等问题,并分别提出了针对性的改进措施。     

Development of microalloyed steel for pipeline applications

Abstract

An experimental HSLA steel was produced by the electric arc furnace, vacuum degassing, ladle treatment and continuous casting route. The experimental steel was then rolled in a laboratory using a hot rolling schedule to simulate an industrial controlled hot rolling procedure for the production of plates as closely as possible to investigate the effect of a thermomechanical processing schedule plus the use of water quench, accelerated cooling followed by forced nitrogen gas or air as cooling media, on the mechanical properties of plates. The results showed that the controlled thermomechanical hot rolling schedule of slabs followed by the cooling of plates in either forced nitrogen gas or by accelerated cooling exhibited target properties equivalent to a steel grade API X-80.