共查询到18条相似文献,搜索用时 93 毫秒
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1 前言随着焊接构件的大型化和制作的高效化 ,要求强度、韧性、焊接性和经济性均优良的钢材。然而 ,为了提高钢的强度而增大其碳当量 (Ceq)时 ,会同时产生焊接 HAZ的硬化 ,从而增大钢的低温裂纹敏感性 ,降低钢的韧性。为了克服这些缺点 ,采用控轧和快冷相结合的 TMCP即热机械控制操作技术 ,进行了低 Ceq高强 (度 )钢的开发。然而 ,在原来的 TMCP技术中 ,钢的微观组织与冷速密切相关 ,而不能从钢板表面到板厚中心部都得到最佳组织 ,也就无法生产 50 mm以上的厚板。为了解决这些课题 ,生产厂家特别关注含 C量 (下记作〔C〕)在 0 .0 2 %… 相似文献
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低碳高强度贝氏体钢板PC80Q的研制 总被引:1,自引:0,他引:1
PC80Q是80kg级的低碳贝氏体钢,有广阔的市场前景。本文对该钢的研制工艺和焊接性能做了详细的分析介绍,结果表明开发的PC80Q钢板各项指标完全满足标准要求。 相似文献
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测试和研究了50 kg真空感应炉熔炼、控轧控冷16 mm超低碳贝氏体DB800(%:0.058C、0.29Mo、0.05Nb、0.08V、0.02Ti、0.001B)板材的连续冷却转变(CCT)曲线、组织转变和力学性能.结果表明,该试验钢种在冷却速率约为10℃/s的水冷条件下的组织为贝氏体(TEM下呈板条状行貌).试验钢种具有优良的综合力学性能:抗拉强度885 MPa,屈服强度733 MPa,伸长率15.2%,-20℃纵向冲击韧性值46 J和极优的冷弯性能. 相似文献
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耐大气腐蚀锕(简称耐候钢)能在表面形成保护性致密锈层,从而显著降低其腐蚀速度。采用这种耐候钢建造的无涂层桥梁节省了初始涂层费及涂层维修费用。然而,现行耐候钢在空气中飞来盐分多的海滨区却难以形成有保护性的锈层,削弱了其防蚀作用。 相似文献
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利用MMS-200热模拟机研究了X80管线钢的相变规律,采用热膨胀法及金相组织分析手段,建立了连续冷却转变曲线,分析了工艺参数对组织的影响规律。试验结果表明,当冷却速率在5~20℃/s时,可以获得需要的针状铁素体组织。根据相变规律,在济钢4 300 mm宽厚板轧机成功开发了壁厚22 mm高强度、高韧性X80管线钢板。检验结果表明,试验钢板的各项性能指标均满足西气东输二线的技术要求。 相似文献
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A self-developed electromagnetic induction-heating device was used to investigate the variation in the microstructure and properties of X80 pipeline steel in the rapid induction tempering process at different process parameters. The effects of the tempering condition on toughness,microstructure,size and distribution of precipitates of X80 pipeline steel were observed using a metallographic microscopy and scanning electron microscopy.Compared with the samples prepared via traditional tempering techniques,results showthat the samples prepared via rapid induction tempering had improved performances. When the heating temperature is 590 ℃,at a holding time of90 s,it was found that acicular ferrite was refined,carbonite precipitation was small,and precipitates were evenly distributed in the matrix. The low-temperature impact energy,also known as the impact absorption energy,at- 40 ℃ was found to be 430. 5 J for the rapid induction tempering samples and 323. 2 J for the traditionally tempered sample. The low-temperature impact energy at- 60 ℃ was found to be 351. 3 J for the rapid induction tempered sample and 312. 1 J for the tradition tempering sample. 相似文献
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The microstructures of X70 pipeline steels with different thickness specifications and different rolling reduction ratios were analyzed by metallographic microscope, scanning electron microscope, and electron backscatter diffraction techniques, and the original austenite microstructures were compared. The effect of compression ratio on the original austenite structure was studied. The results show that the large compression ratio in the rolling process is more conducive to refine austenite grains and improve the low- temperature toughness of thick X70 pipeline steel. However, due to the fact that the temperature during the finish rolling process is too low to permeate the center of the deformation, it is necessary to further use the low- temperature stage of the rough rolling process to perform deformation infiltration. Ultra- rapid cold cooling after rolling can improve the DWTT performance of the steel, but it is not sufficient to compensate for the fluctuation of DWTT performance caused by insufficient early austenite grain refinement. 相似文献
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由于长距离高压油气输送的需要,高强度高韧性管线用钢得到迅速发展.宝钢在完成"西气东输"工程用X70管线钢后,进行了更高强度级别X80管线钢的研制.现就宝钢X80管线铜的研制和应用情况,X80管线钢的成分、工艺、组织、性能和制成φ1 016×15.3 mm螺旋焊管性能进行论述.合理的成分配合最佳的控轧控冷工艺,是X80管线钢获得具有针状铁素体微观组织和高的冲击韧性、优良的低温抗动态撕裂能力的关键. 相似文献