本文選題：高合金 + 相變規(guī)律��； 參考：《遼寧科技大學》2017年碩士論文

【摘要】：近年來,隨著人類對能源需求的增加,人們加大了對海洋能源的開發(fā)尤其是油氣資源,導致各國對海底管線鋼的需求增加。本文以鞍鋼南海荔枝灣項目X65海底管線鋼為技術理論支持,針對大壁厚X70深海海底管線鋼技術進行了深入的可行性研究和實驗室鋼板試制,試圖突破大壁厚X70深海海底管線鋼的技術難點并提出合理化生產方案。本研究主要工作如下:(1)在X65海底管線鋼的基礎上,通過實驗研究確定了低碳低錳高鎳、鉻、銅、鉬合金含量的X70海底管線成分。(2)確定成分之后,利用Gleeble-3800熱模擬實驗機,確定相變開始和結束的溫度,在顯微鏡下觀察不同冷速下的顯微組織,測定不同冷速下的硬度,繪制出CCT曲線。(3)通過CCT曲線可以得出在高Ni、Cr、Cu、Mo含量的X70海底管線鋼成分中,隨著冷速的增加,鋼板硬度也增加,當冷速達到50℃/s鋼板硬度開始下降。(4)通過實驗得出在X70海底管線鋼的成分中提高Ni、Cr、Mo的含量同時適當降低Cu的含量可以使管線鋼的抗腐蝕性能達到標準。(5)開展了深海大壁厚X70海底管線鋼的落錘性能控制措施研究;重點研究了成分、軋制工藝及冷卻工藝與落錘性能的相關性,探索出大壁厚X70深海海底管線鋼落錘性能控制及優(yōu)化途徑。(6)優(yōu)化X70海底管線鋼的成分以及軋制工藝,得到了與產線設備及能力適應的厚壁深海管線鋼的工業(yè)生產方案。
[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，

本文編號：1928201