介绍了国产海洋用钢（Ｚ向钢）焊接Ｔ型管节点疲劳试验的过程和成果．试验对Ｔ型管节点的应力集中系数、应力分布、疲劳寿命及裂纹扩展进行了详细测量，经过分析得到Ｔ型管节点实测应力集中系数的经验公式、疲劳Ｓ－Ｎ曲线及裂纹扩展规律．试验结果表明国产Ｚ向钢、国内焊接工艺和加工制造的焊接管结点有较好的疲劳性能，为我国海上平台国产化提供了依据． This paper introduces the process and results of the fatigue test of welded T-tube joints of domestic marine steels (Z-direction steels). The stress concentration factor, stress distribution, fatigue life and crack propagation of T-shaped pipe joints were measured in detail. The empirical formula of stress concentration factor, fatigue S-N curve and crack propagation law of T-shaped pipe joints were obtained. The test results show that domestic Z-direction steels, domestic welding processes and welded pipe joints manufactured by this method have better fatigue performance, which provides a basis for the localization of offshore platforms in China.