| 大口径厚规格X80管线钢的低温断裂控制 |
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| 引用本文： | 熊祥江,范明,杨小军,李中平,史术华,彭宁琦,钱亚军,彭清.大口径厚规格X80管线钢的低温断裂控制[J].金属热处理,2021,46(4):227-231. |
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| 作者姓名： | 熊祥江 范明 杨小军 李中平 史术华 彭宁琦 钱亚军 彭清 |
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| 作者单位： | 湖南华菱湘潭钢铁有限公司, 湖南 湘潭 411101 |
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| 摘 要： | 以大口径(OD1422 mm)、大壁厚(38.5 mm)X80级管线钢热轧板为研究对象,采用光学显微镜和扫描电镜对其显微组织和-20 ℃低温落锤撕裂试验断口形貌进行分析,研究了断裂与组织之间的关系。结果表明,带状组织和不同厚度位置晶粒度大小不均,粒状贝氏体、退化珠光体、准多边形铁素体和马奥岛等混合组织会导致裂纹的萌生和扩展,出现解理断裂,对低温韧性不利,而尺寸为3 μm以下的马奥组织和均匀分布的贝氏体铁素体对裂纹扩展起阻碍作用,说明细小的马奥组织和贝氏体铁素体能够提高钢板的断裂韧性,对低温断裂控制十分有利。
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| 关 键 词： | 管线钢 落锤撕裂试验(DWTT) 组织 裂纹 断裂 |
| 收稿时间： | 2020-10-03 |
Low temperature fracture control of heavy-gauge X80 pipeline steel for large diameter pipe |
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| Xiong Xiangjiang,Fan Ming,Yang Xiaojun,Li Zhongping,Shi Shuhua,Peng Ningqi,Qian Yajun,Peng Qing.Low temperature fracture control of heavy-gauge X80 pipeline steel for large diameter pipe[J].Heat Treatment of Metals,2021,46(4):227-231. |
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| Authors: | Xiong Xiangjiang Fan Ming Yang Xiaojun Li Zhongping Shi Shuhua Peng Ningqi Qian Yajun Peng Qing |
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| Affiliation: | Hunan Valin Xiangtan Iron and Steel Co., Ltd., Xiangtan Hunan 411101, China |
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| Abstract: | Taking the large diameter (OD1422 mm) with heavy wall thickness (38.5 mm) pipeline made of X80 grade hot-rolled steel sheet as the research object, the microstructure and fracture morphologies of -20 ℃ low temperature DWTT of the steel were analyzed by means of OM and SEM, and the relationship between fracture and microstructure was discussed. The results show that band structure and uneven grain size at different position in wall, mixed structure of granular bainite, degraded pearlite, quasi-polygonal ferrite, martensite-autenite island, ect. will cause the initiation and propagation of cracks and the appearance of cleavage fracture, which reduces low temperature toughness. However, the martensite-austenite structure with a size of 3 μm or less and the uniformly distributed bainite ferrite hinder the crack propagation, and the fine martensite-austenite structure and bainitic ferrite can improve the fracture toughness of the steel plate, which is effective for controlling the low-temperature fracture of the steel. |
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| Keywords: | pipeline steel DWTT structure crack fracture |
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