共查询到19条相似文献,搜索用时 78 毫秒
1.
2.
通过对低碳高铌不添加钼的Cr-Nb微合金钢高温轧制(HTP)、低碳Mo-Nb微合金化钢传统热机械轧制(TMCP)的两种钢板制管性能的对比分析,证实了采用HTP工艺技术生产的管线钢板完全能够制造出符合现行技术标准要求的X80钢级直缝埋弧焊管,而且生产成本大幅度降低,有助于提升管线管的竞争力。 相似文献
3.
加快新一代高钢级HTP管线钢管开发迎接新一轮管线建设高潮 总被引:7,自引:2,他引:5
介绍了HTP管线钢的基本概念以及在国内外的开发应用情况。通过比较分析后指出,我国有关部门应加强对HTP管线钢与管的专题研究,采取有效措施加快开发步伐,并使研发成果迅速推广应用,为迎接下一轮管线建设高潮做好技术和物资准备。 相似文献
4.
Nb、Mo含量对高钢级管线钢组织性能的影响 总被引:1,自引:0,他引:1
采用Gleeble-1500热模拟试验机并结合微观组织和力学性能测试,分析了不同铌、钼含量对管线钢的组织、力学性能和CCT曲线的影响.结果表明:随钼的质量分数增加,针状铁索体的含量增加,并且出现了M-A组织.铌在钢中可抑制奥氏体的再结晶,保持变形效果从而细化铁素体晶粒,得到细小的贝氏体组织,并且铌含量的增加使得管线钢强度和硬度鄙相应增大,冲击韧度降低.在连续冷却转变过程中,钼元素的加入使相变点温度降低,在相同的冷却条件下容易发生贝氏体转变,并使其CCT曲线向右移.而铌元素的加入增大了过冷奥氏体的稳定性,相变点温度降低,并且推迟珠光体的转变. 相似文献
5.
6.
7.
8.
9.
10.
11.
Tadeu Messias Donizete Borba Wagner Duarte Flores Leonardo de Oliveira Turani Ronaldo Cardoso Junior 《Welding International》2017,31(3):184-195
High heat input welding is one of the alternatives adopted by the world’s major shipyards for increasing productivity in operations for joining materials in shipbuilding. However, the thermal cycles generated during welding may cause microstructural transformations that are detrimental to the mechanical properties, mainly toughness in the heat-affected zone (HAZ). The main aim of this study was characterization of the microstructure and assessment of the mechanical properties of the HAZ of EH36 shipbuilding steel produced by controlled rolling followed by accelerated cooling (Thermo Mechanical Control Process (TMCP) – thermo-mechanically controlled process) compared to a steel of the same grade produced by conventional rolling, both welded by the submerged arc process with two levels of heat input: 76 and 130 kJ/cm. It was observed that the presence of a more refined microstructure in the different regions of the HAZ, associated with the smaller grain size of the base metal and the lower carbon equivalent, were the main factors contributing to the excellent toughness of the HAZ of TMCP steel compared to conventional steel. The results achieved show that it is possible to obtain welded joints with excellent mechanical properties and toughness when using TMCP steel for high heat input welding, and its use is a possible strategy for optimizing fabrication times and costs in the shipbuilding industry. 相似文献
12.
通过采用低C、高Mn、Nb和Ti复合添加的化学成分设计以及TMCP工艺,山东钢铁集团日照有限公司成功生产了40~60mm厚Q420qE钢板,钢板焊接性能和力学性能均可满足桥梁工程要求。 相似文献
13.
Ajit Roy Pankaj Kumar Debajyoti Maitra 《Journal of Materials Engineering and Performance》2009,18(2):205-210
The impact resistance of silicon (Si)-containing modified 9Cr-1Mo steels has been investigated within a temperature regime
of −40 to 440 °C using the Charpy method. The results indicate that the energies absorbed in fracturing the tested specimens
were substantially lower at temperatures of −40, 25, and 75 °C compared to those at elevated temperatures. Lower impact energies
and higher ductile-to-brittle-transition-temperatures (DBTTs) were observed with the steels containing 1.5 and 1.9 wt.% Si.
The steels containing higher Si levels exhibited both ductile and brittle failures at elevated temperatures. However, at lower
temperatures, brittle failures characterized by cleavage and intergranular cracking were observed for all four tested materials. 相似文献
14.
15.
16.
17.
18.
19.
分析了高锰奥氏体钢的合金化及其一般合金元素作用机理、变质剂及其变质机理和复合变质机理,并介·绍了常用的普通热处理及弥散热处理工艺,为提高高锰奥氏体钢的冲击韧性和耐磨性提供重要依据。 相似文献