Experimental Analysis of the Mechanical Properties of Austenitic S30408 Stainless Steel Welded Joints at Low Temperatures

被引:0
|
作者
Hongbo Liu
Longxuan Wang
Yixin Yang
Ting Zhou
Jing Li
机构
[1] Hebei University of Engineering,School of Civil Engineering
[2] Tianjin University,School of Civil Engineering
[3] Tianjin University,School of Architecture
[4] Railway 18th Bureau Group Co. LTD,undefined
来源
International Journal of Steel Structures | 2023年 / 23卷
关键词
Austenitic stainless steel; Welded joint; Tensile test; Cryogenic property;
D O I
暂无
中图分类号
学科分类号
摘要
Austenitic S30408 stainless steel exhibits good low-temperature resistance and good welding performance. This steel is often used in liquefied natural gas stainless steel storage tanks. During the construction process, the tank wall is primarily connected by butt weld joints. Because welded joints are easily affected by temperature, low-temperature weld cracking can reduce the safety of structures. To study the cryogenic mechanical properties of austenitic S30408 stainless steel welded joints at low temperatures, the low-temperature mechanical properties of austenitic S30408 stainless steel base metal and welded joint components were studied by tensile tests from − 60 to 20 °C and scanning electron microscopy analysis of fractures at various temperatures. The results show that when the temperature decreases, the stress–strain curve of base metal components changes from a power function type to an inverted "s" type; in addition, secondary hardening occurs. The yield strength and tensile strength of the welded joint and base metal increased with decreasing temperature, and the elongation and reduction of area decreased. The plastic deformation capacity of the welded joint was significantly lower than that of the base metal, and there were obvious inclusions in the microstructure.
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页码:1265 / 1278
页数:13
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