| 摘要: |
| 回顾总结了液化天然气低温储罐用9%Ni钢的研究和发展,对9%Ni钢的显微组织结构、力学性能以及现场焊接性进行了介绍。使用最普遍的淬火+回火态9%Ni钢的组织形态主要为回火马氏体,并分布有少量残余奥氏体。9%Ni钢具有很高的强度和良好的低温韧性,焊接性良好,冷裂敏感性较低,采用合适的焊接工艺措施,可防止热裂纹的出现,获得具有良好低温韧性的焊接接头。9%Ni钢焊接时,焊接热输入一般控制在7~35kJ/cm,多层焊层间温度应控制在100℃以下。 |
| 关键词: LNG储罐 9%Ni钢 组织结构 焊接工艺参数 焊接性 |
| DOI： |
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| Review of 9% Ni steel and its weldability |
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YAN Chunyan1, LI Wushen1, XUE Zhenkui2, BAI Shiwu2, FENG Bin2
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1.School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;2.Petroleum-Gas Pipeline Research Institute of China, Langfang 065000, Hebei, China
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| Abstract: |
| Research and development status of 9%Ni steel for cryogenic liquefied natural gas storage tanks were summarized and reviewed.Microstructures, mechanical properties and field weldability were presented.Most commonly used quenched and tempered 9%Ni steel is composed of a majority of tempered martensite and a few scattered retained austenites.Base metal of 9% Ni steel shows high strength, good cryogenic toughness, excellent field weldability and low cold-cracking susceptivity.Hot-cracking can be avoided under proper welding parameters.A heat input of 7-35 kJ cm and a interpass temperature lower than 100℃ are generally adopted for the welding of 9% Ni steel. |
| Key words: liquefied natural gas storage tanks 9% Ni steel microstructure welding parameters weldability |
