研究生: |
陳淑雲 Shu-yun Chen |
---|---|
論文名稱: |
原油加熱爐內碳鋼與5Cr-0.5Mo低合金鋼爐管銲接性 The Weldability of Carbon Steel and 5Cr-0.5Mo Low Alloy Steel Tubes for Crude Oil Furnace |
指導教授: |
蔡顯榮
Hsien-jung Tsai |
口試委員: |
翁榮洲
Jung-chou Weng 周賢鎧 Hsien-kai Chou |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 材料科學與工程系 Department of Materials Science and Engineering |
論文出版年: | 2005 |
畢業學年度: | 93 |
語文別: | 中文 |
論文頁數: | 107 |
中文關鍵詞: | 碳鋼 、銲接性 、肥粒鐵 、原油加熱爐 、波來鐵 、潛變 、熱影響區 、變靭鐵 |
外文關鍵詞: | 5Cr-0.5Mo, Tungsten inert gas, Heat-affected zone. Crude oil furnace |
相關次數: | 點閱:244 下載:2 |
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本研究主要是評估原油加熱爐輻射區碳鋼與5Cr-0.5 Mo低合金鋼爐管之銲接性,實驗使用TIG銲接方式進行碳鋼與5Cr-0.5Mo低合金鋼爐管對銲及碳鋼與碳鋼爐管對銲,置於煉油廠原油加熱爐輻射區中,爐壁溫度保持370-395℃之間試驗使用六年後取出,並與於室溫下存放六年之相同銲道相比,分析銲道的銲接性,研究其機械性質包括硬度、微硬度、拉伸試驗、金相試驗及SEM顯微觀察等,結果顯示:使用六年的銲道熱影響區有狹窄0.036mm寬白色肥粒鐵帶,但存放於室溫下六年之銲道並沒有白色肥粒鐵帶,且此熱影響區的抗拉強度426 MPa,比碳鋼母材的抗拉強度460 MPa及5Cr-0.5Mo母材590 MPa低,但仍高於API規範值400 MPa;不論試驗使用過的銲道或於室溫下存放六年之銲道,碳鋼與5Cr-0.5Mo低合金鋼爐管對銲或碳鋼與碳鋼對銲,兩者的銲道品質良好,且機械性質佳,銲道及母材也沒有裂縫等缺陷,碳鋼與5Cr-0.5Mo低合金鋼母材也沒有潛變行為。
The weldability of carbon steel and 5Cr-0.5Mo low alloy steel tubes for crude oil furnace was investigated in this study. After carbon steel and 5Cr-0.5Mo low alloy steel tubes were welded together with tungsten inert gas(TIG) welding, they were put in crude oil furnace radiation section as tubes which temperature were controlled between 370 ℃ and 395℃ for 6 years. In addition, the comparison analysis between weldability putting in service and that of not putting in service only in workshop under ambient atmosphere for 6 years was done. The items for analysis are mechanical properties including hardness, micro-hardness, tensile strength, microstructure and SEM micrograph and etc. As a result, a narrow ferrite band, 0.036 mm in heat affected zone was found for the weldment in service, but the weldment not in service was not. Furthermore, the tensile strength, 426 MPa, of the HAZ is the lowest one compared to carbon steel’s tensile strength, 460 MPa and 5Cr-0.5Mo’s tensile strength, 590 MPa;however, it is bigger than the specification, 400 MPa, of API. No wonder the weldability in service or not, they have a great performance and wonderful mechanical properties. Also, there are no cracks, defect and creep in weldment and base material. Consequently, the result indicates carbon steel and 5Cr-0.5Mo low alloy steel tubes have great weldability in high temperature radiation section of crude oil furnace for 6 years.
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