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船舶制造为了提高效率采取了增加焊接线能量手段,针对提高大线能量焊接热影响区(HAZ)的韧性,开发了JFE EWEL新技术,其核心是采用最佳TiN形态控制HAZ区的晶内组织状态、微合金化技术控制HAZ区域的组织结构及超级OLAC和工艺参数优化组合。基于本技术开发生产的390MPa厚板、LPG船用低温钢、355MPa船板,其优良的母材特性满足了大线能量焊接等要求。 相似文献
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随着钢结构未来向大型化发展,对钢的焊接线能量提出了〉70kJ/cm的新要求。根据Q345强度级别钢的技术条件和市场需求,通过合理的化学成分设计,采用合适的冶炼、轧制和正火工艺,保证力学性能,采用高效的气电立焊焊接方法进行最大线能量试制,不但提高了品种钢的大线能量特性,也为大线能量专用钢板研发提供生产工艺基础。 相似文献
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The influence of Ti on weld microstructure and mechanical properties in large heat input welding of high strength low alloy steels is investigated.The results indicate that a moderate amount of Ti is still effective for grain refinement even under larger heat input and a large amount of acicular ferrite(AF)is formed in the weld metal when Ti content is within 0.028%-0.038%.With increasing Ti content,proeutectoid ferrite in the weld metal decreases,whereas bainite and M-A constituent increase.The type of inclusion in the welds varies from Mn-Si-Al-O to TiMn-Al-O and finally to Ti-Al-O as Ti content increases from 0up to 0.064%.As for adding 0.028%-0.038% Ti,high weld toughness could be attained since most inclusions less than 2μm which contain Ti2O3 provide the effective nuclei for acicular ferrite formation.However,the toughness of the weld metals severely reduces when Ti content is over the optimum range of 0.028%-0.038%. 相似文献
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经过系列技术攻关,改进了武钢专用钢板冶炼及连铸过程中一些工艺,形成了一套自主操作技术模式,生产的微合金化低合金高强钢中杂质含量显著降低,钢板性能稳定性明显提高.利用武钢新改进的冶炼技术研制了一种600 MPa级低焊接裂纹敏感性高能量输入焊接水电站压力钢管用钢,研究了该钢的力学性能、微观组织结构以及焊接粗晶热影响区(CGHAZ)的组织特征及力学性能.结果表明,研制的新钢种集高强度、高韧性、优异的焊接性能于一体,且能承受大线能量焊接,焊前不预热,焊后不热处理.CGHAZ中弥散分布的复合氧化物夹杂促使针状铁素体的形成,提高了CGHAZ的力学性能. 相似文献
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采用实物焊接和热模拟的方法研究了大型原油储罐用610MPa级高强度钢板大热输入焊接性能。结果表明,试验钢具有良好的抗大热输入量焊接的能力,原因是钢板中存在大量细小、弥散分布的TiN复合粒子,在焊接热循环的高温阶段,TiN粒子通过有效钉轧奥氏体晶界和促进铁素体晶内形核,抑制了焊接热影响区组织粗化;采用气电立焊和埋弧横焊焊接后,焊接对接接头的拉伸强度、低温冲击和冷弯性能优良,性能指标富余量大,试验钢板完全可以应用于10万m3及以上大型石油储罐的建造。 相似文献
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利用50 kg真空电炉、小型试验轧机等设备进行了大热输入焊接Q460D结构钢板的试制.试制钢板以Cu作为主要强化元素,未添加Mo、Cr元素,有效控制了钢板成本.钢板采用全Ti脱氧工艺冶炼,然后经过控轧控冷及回火热处理获得最终成品.对钢板进行了不同回火温度后的力学性能检验和焊接热模拟试验.结果表明,610℃回火热处理时,钢板本身的强韧性匹配最佳.该回火工艺处理的钢板在100~120 kJ/cm大热输入焊接条件下,焊接热影响区粗晶区(CGHAZ)-20℃低温冲击功大于100 J,CGHAZ强度不低于基材. 相似文献
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随着集装箱货船大型化,要求集装箱船用钢板向大厚度、高强度、大线能量焊接接头高韧性方向发展。为此,新日铁公司充分利用其开发的热影响区细晶高韧性化“HTUFF@”技术,通过加入微细氧化物抑制焊接热影响区组织的粗大化,成功开发了屈服强度390MPa级大线能量焊接用大型集装箱船用钢板。采用气电立焊对开发的65mm厚钢板进行焊接,焊接接头具有良好的韧性。 相似文献
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为了确保原油储罐用钢的大热输入焊接性能,试制中重点控制T610E钢的化学成分,分析大热输入性能的机理,并进行了焊接热模拟试验。试制结果表明,太钢生产的T610E钢具有优良的大热输入焊接性能,满足了大型原油储罐工程建造的要求。 相似文献
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There are two kinds of mechanisms of the improvement of Heat Affected Zone(HAZ) toughness with fine inclusion particles. One is to prevent the austenite grain growth during welding process with the aid of the pinning effect of fine particles. The other is to promote the Intragranular Ferrite growth during phase transformation process with fine particles. The oxide metallurgy technology with strong deoxidizers is developed in Baosteel. With the pinning effect of fine particles, after welding with high‐heat input of 400 kJ/cm, the average austenite grain size decreased to 61 µm in HAZ, the average energy absorbed value increased to 142 J for V notch Charpy test at 1653 K. 相似文献
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大型原油储罐用B610E(08MnNiVR)高强度调质钢板研制 总被引:3,自引:0,他引:3
介绍了在宝钢分公司厚板厂产线上开发成功的大型原油储罐用B610E(08MnNiVR)高强度钢板的成分和性能特点、生产工艺,列举了典型厚度钢板的实物性能,试验和分析了其大热输入焊接的适应性。研究结果表明,宝钢分公司厚板厂产线工业批量生产的B610E(08MnNiVR)钢板性能稳定。完全满足10万m。大型原油储罐用大热输入焊接高强度钢板技术要求,已成功地用于建造10万m。原油浮顶储罐。 相似文献
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��С����������� 《钢铁研究学报》2013,25(9):52-57
Electro-slag welding with heat input of 530kJ/cm was applied to 60mm thick shipbuilding plate EH40, and microstructure and mechanical properties of the weld joint were characterized. Different regions such as heat affected zone, fusion zone, weld metal and base metal are found across the weld joint by microstructure analysis. A narrow coarse grain heat affected zone consisting of acicular ferrite, polygonal ferrite and grain boundary ferrite is found, width of which is less than 1mm. Acicular ferrite (?? 10??m) and grain boundary ferrite is observed at weld metal, while fusion zone have a complex structure of acicular ferrite, grain boundary ferrite and ferrite side plate. Mechanical property tests show that the absorbed energy of WM, FL and CGHAZ at -20?? during Charpy impact test is more than 60J, no evident softening phenomenon occurred at heat affected zone, and other properties met the requirement. 相似文献