X70海底管线钢的研制及成分优化

发布时间：2018-05-24 07:23

  本文选题：高合金 + 相变规律　； 参考：《辽宁科技大学》2017年硕士论文

【摘要】：近年来,随着人类对能源需求的增加,人们加大了对海洋能源的开发尤其是油气资源,导致各国对海底管线钢的需求增加。本文以鞍钢南海荔枝湾项目X65海底管线钢为技术理论支持,针对大壁厚X70深海海底管线钢技术进行了深入的可行性研究和实验室钢板试制,试图突破大壁厚X70深海海底管线钢的技术难点并提出合理化生产方案。本研究主要工作如下:(1)在X65海底管线钢的基础上,通过实验研究确定了低碳低锰高镍、铬、铜、钼合金含量的X70海底管线成分。(2)确定成分之后,利用Gleeble-3800热模拟实验机,确定相变开始和结束的温度,在显微镜下观察不同冷速下的显微组织,测定不同冷速下的硬度,绘制出CCT曲线。(3)通过CCT曲线可以得出在高Ni、Cr、Cu、Mo含量的X70海底管线钢成分中,随着冷速的增加,钢板硬度也增加,当冷速达到50℃/s钢板硬度开始下降。(4)通过实验得出在X70海底管线钢的成分中提高Ni、Cr、Mo的含量同时适当降低Cu的含量可以使管线钢的抗腐蚀性能达到标准。(5)开展了深海大壁厚X70海底管线钢的落锤性能控制措施研究;重点研究了成分、轧制工艺及冷却工艺与落锤性能的相关性,探索出大壁厚X70深海海底管线钢落锤性能控制及优化途径。(6)优化X70海底管线钢的成分以及轧制工艺,得到了与产线设备及能力适应的厚壁深海管线钢的工业生产方案。
[Abstract]:In recent years, with the increase of human energy demand, people have increased the development of marine energy, especially oil and gas resources, resulting in increased demand for submarine pipeline steel. In this paper, taking X65 submarine pipeline steel of Nanhai Lizhiwan Project of Anshan Iron and Steel Co., Ltd as the technical theoretical support, the deep sea pipeline steel technology of X70 with large wall thickness has been studied deeply and the laboratory steel plate has been trial-produced. This paper attempts to break through the technical difficulties of deep sea submarine pipeline steel X70 with large wall thickness and puts forward a rational production plan. The main work of this study is as follows: (1) on the basis of X65 submarine pipeline steel, the composition of X70 submarine pipeline with low carbon, low manganese, high nickel, high chromium, copper and molybdenum alloy content has been determined by experimental study, and the composition has been determined by Gleeble-3800 thermal simulation experiment machine. Determining the temperature at which the phase transition begins and ends, observing the microstructure at different cooling rates under a microscope, measuring the hardness at different cooling rates, drawing out the CCT curve. (3) the composition of the X70 submarine pipeline steel with high NiCrCU Cu Mo content can be obtained by CCT curve. As the cooling rate increases, so does the hardness of the steel plate. When the cooling rate reached 50 鈩，

本文编号：1928201