Page 32 - 理化检验-物理分册2025年第三期

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试验与研究 DOI:10.11973/lhjy-wl230368

X80钢管环焊缝接头的显微组织与力学性能

1,2
蔺卫平 ，路广平 ，段海宁 1,2
3
[1.中国石油集团工程材料研究院有限公司，西安 710077；2.国家市场监管重点实验室
(石油管及装备质量安全） ，西安 710077；3.南京巨龙钢管有限公司，南京 210061]

摘 要：对X80钢管环焊缝接头不同焊接位置的显微组织与力学性能进行研究。结果表明：平焊
位，立焊位和仰焊位焊接接头均无气孔、夹渣、未熔合等焊接缺陷；母材组织由粒状贝氏体组成，焊
缝组织由晶内成核针状铁素体加少量的粒状贝氏体、多边铁素体组成，粗晶区组织由粒状贝氏体组
成，细晶区组织由多边铁素体和少量的马氏体、奥氏体岛状组织组成；环焊缝焊接接头在4个象限的
抗拉强度基本相同，平焊位和仰焊位全焊缝拉伸试样的屈服强度和抗拉强度也很接近；立焊位焊缝
和热影响区的平均冲击吸收能量比平焊位和仰焊位低；立焊位焊缝和热影响区的平均硬度高于仰焊
位；平焊位、立焊位和仰焊位焊缝的裂纹尖端张开位移均小于其热影响区，这与冲击试验结果一致。
关键词： X80钢；环焊缝；显微组织；力学性能；裂纹尖端张开位移
中图分类号：TG115.5；TB31 文献标志码：A 文章编号：1001-4012(2025)03-0020-05
Microstructure and mechanical properties of girth weld joint

of X80 steel pipe

LIN Weiping , LU Guangping , DUAN Haining 1,2
1,2
3
[1. Tubular Goods Research Institute of CNPC,Xi’an 710077,China; 2. Key Laboratory of State Administration for Market
Regulation（Quality and Safety of Petroleum Pipes and Equipment）, Xi’an 710077, China;
3. Nanjing Julong Steel Pipe Co., Ltd., Nanjing 210061, China]

Abstract: The microstructure and mechanical properties of X80 steel pipe girth weld joints at different
welding positions were studied. The results show that there were no welding defects such as porosity, slag inclusion
and lack of fusion in the welded joints of flat welding position, vertical welding position and overhead welding
position. The microstructure of base metal was composed of granular bainite. The microstructure of weld seam was
composed of intragranular nucleation acicular ferrite and a small amount of granular bainite and polygonal ferrite. The
microstructure of coarse grain zone was composed of granular bainite, and the microstructure of fine grain zone was
composed of polygonal ferrite and a small amount of martensite and austenite island structure. The tensile strength of
the circumferential weld joint in the four quadrants was basically the same, and the value of yield strength and tensile
strength of the full weld tensile specimens of flat welding position and overhead welding position were also very close.
The average impact absorbed energy of vertical weld position and heat affected zone was lower than that of flat weld
position and overhead weld position. The average hardness of vertical welding position seam and heat affected zone was
higher than that of overhead welding position. The crack tip opening displacements of flat welding position, vertical
welding position and overhead welding position weld were less than the heat affected zone, which were consistent with

the impact test results.
Keywords: X80 steel; girth weld; microstructure; mechanical property; crack tip opening displacement

近年来，中国的长输管线建设取得了前所未有
的发展，西气东输、中亚管线、中俄东线等重大管道
收稿日期：2023-12-22
工程相继建设。长输管线材料主要采用X70、X80管
作者简介：蔺卫平（1975—），女，硕士，高级工程师，主要从事金
属材料性能测试与研究工作，linwp@cnpc.com.cn 线钢，其口径大、压力高，因此管道的安全性能尤为
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