邯宝3200m~3高炉降本增效实践

对邯钢邯宝炼铁厂1#高炉(有效容积3200m3)降本增效的实践进行了总结,通过严抓原燃料质量、完善操作制度、提高职工操作水平、规范炉前出铁等措施,保持了高炉稳定顺行;通过低硅冶炼,提高风温和煤气利用率、降低燃料比;对焦丁仓扩容改造后,使焦丁可以完全入炉,减少燃料浪费;优化炉料结构,提高生矿配比,降低原料成本。采用上述措施后,1#高炉的生铁成本降至2429.7元,吨铁降本增效356.9元。     

09年交通建设带动基建水泥大幅增长

一、机场建设 2008年,民航业全年完成固定资产投资600亿元,年初圈定的22个重点项目均进展顺利,全年新增的8个民用运输机场,大部分位于中西部地区和东北地区。     

不同工况下活塞二阶运动和活塞裙部润滑研究

目前研究内燃机活塞二阶运动和活塞裙-缸套摩擦副润滑时一般仅针对标定工况进行,不考虑实际使用内燃机工作中工况的不断变化。另外,分析中一般都假设活塞裙-缸套摩擦副在一个内燃机工作循环中处于充分润滑状况。以某四行程内燃机为研究对象,基于实测的气缸压力,考虑实际润滑油流动确定摩擦副的润滑状况,进行不同内燃机工况下的活塞二阶运动和活塞裙-缸套摩擦副润滑分析。结果表明,不同工况下的活塞二阶运动性能和活塞裙-缸套摩擦副润滑性能都存在差异,活塞二阶运动性能和活塞裙-缸套摩擦副润滑性能的最不利情况不一定出现在标定工况。因此,内燃机活塞组件设计时,如果仅分析标定工况下的活塞二阶运动和活塞裙-缸套摩擦副润滑性能将不够全面合理,需要进行不同工况下活塞二阶运动和活塞裙-缸套摩擦副润滑性能的分析计算。     

Effect of rare earth oxides on the morphology of carbides in hardfacing metal of high chromium cast iron

The flux cored wires with different amounts of rare earth (RE) oxides additions for hardfacing (harden-face-welding) the workpieces of high chromium cast iron were studied in this work.The morphology of carbides in hardfacing metal was observed,and the type of the carbides was determined by optical microscopy,scanning electron microscopy (SEM),energy dispersive spectrometer (EDS) and X-ray diffraction (XRD).Based on the data of effect of RE on carbides morphology,the refined reason for carbide by RE oxide was discussed with the misfit theory.The results showed that,the microstructure of hardfacing metal was composed of martensite,residual austenite and M7C3 carbides.With the increasing amount of RE oxide additions,the volume fraction and roundness of the carbides were increased,however,the area and perimeter of carbides were decreased.It indicated that carbides in hardfacing metal could be refined and spheroidized by adding RE oxides in flux cored wires.     

基于FSM的WIA-PA协议测试序列自动生成技术研究

本文重点介绍基于有限状态机（FSM）测试序列生成方法,并以现场设备安全入网为例,利用该方法生成测试序列。为构建WIA-PA协议测试FSM模型,文中分析了WIA-PA协议测试中的安全入网的设备状态、事件、输出和转移输出,在此基础上建立了现场设备安全入网测试的FSM模型。然后在FSM模型基础上,采用UIO方法生成测试序列。     

09年交通建设带动基建水泥大幅增长

一、机场建设 2008年,民航业全年完成固定资产投资600亿元,年初圈定的22个重点项目均进展顺利,全年新增的8个民用运输机场,大部分位于中西部地区和东北地区.     

GH4169和1Cr18Ni9Ti真空钎焊接头组织和力学性能

采用厚50μm的BNi82Cr Si B钎料,在1060℃/20min、1000℃/60min规范下对GH4169和1Cr18Ni9Ti异种金属进行真空钎焊试验。利用扫描电子显微镜(SEM)及能谱分析仪(EDS)观察和分析接头的界面组织;采用Instron1186型万能试验机测试接头的室温剪切强度,并对接头进行水压强度试验。研究表明,间隙60μm的钎焊接头钎缝致密完整,钎缝主要由镍基的固溶体组成。接头在水压20 MPa、保压10 min的情况下,钎缝无渗漏;接头常温剪切强度318 MPa,断口分析结果表明接头的断裂有韧性断裂的特征。     

Effect of La2O3 on granular bainite microstructure and wear resistance of hardfacing layer metal

The purpose of this work was to investigate the effect of La2 O3 on the granular bainite microstructure and wear resistance of hardfacing layer metal. The hardfacing layer metals with different contents of La2 O3 were prepared. The microstructures of the hardfacing layer metals were observed by field emission scanning electron microscopy(FESEM) and transmission electron microscopy(TEM). The hardness and wear resistance of the hardfacing layer metals were measured respectively. The results indicated that with the increasing content of La2 O3, the amount of granular bainite increased, while that of martensite decreased and that of retained austenite did not change obviously. When the content of La2 O3 was 2.55 wt.%, the volume fraction of the granular bainite in the hardfacing layer metal was 73.2%. Meanwhile, the wear resistance of the hardfacing layer metal was the largest, which was 12100 min/g. The mismatch between the face(100) of LaAlO3 and the face(100) of δ-Fe was 7.1%. Therefore, LaAlO3 could act as moderate effective heterogeneous nuclei of δ-Fe and the granular bainite could be refined.     

邯宝1号高炉非计划长期休风恢复实践

邯宝1号3 200m3大型高炉2016年6月1日因主皮带断裂造成非计划休风34.5h,休风前炉况持续稳定顺行、炉缸活跃、炉温充足、各项经济指标较好。此次送风恢复过程中降低负荷、重视炉热水平、调整炉料结构,根据轻负荷料下达位置及炉内接受情况分3个阶段进行风量和氧量的恢复。同时通过炉温情况补充煤粉、快速用上高风温,提前做好出铁准备、合理安排炉前作业等,实现了炉况的快速恢复。     

Effect of RE oxide on growth dynamics of primary austenite grain in hardfacing layer of medium-high carbon steel

The flux cored wires with different rare earth oxide additions for hardfacing the workpieces of medium-high carbon steel were developed. The microstructure of the hardfacing layer was observed using the optical microscopy. The average dimension of primary austenite grains in hardfacing layer was measured by image analyzer. The primary austenite grain growth activation energy and index were calculated according to Sellars’s mode and Beck formula, respectively. Moreover, the effect of rare earth oxide on the growth dynamics of primary austenite grain was analyzed, and then discussed with the misfit theory. The experimental results showed that, by adding rare earth oxide, the average dimension of primary austenite grains in hardfacing layer of medium-high carbon steel decreased, and it was the smallest when the addition of rare earth oxide was 5.17 wt.%. Meanwhile, at this rare earth oxide addition, the primary austenite grain growth activating energy in hardfacing layer was the largest, while its index was the smallest. The calculated results indicated that the primary austenite grain could be refined because LaAlO3 as heterogeneous nuclei of γ-Fe was the most effective.