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

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Abstract

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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Authors and Affiliations

  1. School of Civil Engineering, Hebei University of Engineering, Handan, 056038, China

    Hongbo Liu

  2. School of Civil Engineering, Tianjin University, Tianjin, 300072, China

    Longxuan Wang & Yixin Yang

  3. School of Architecture, Tianjin University, Tianjin, 300072, China

    Ting Zhou

  4. Railway 18th Bureau Group Co. LTD, Tianjin, 300222, China

    Jing Li

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  1. Hongbo Liu
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  2. Longxuan Wang
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  3. Yixin Yang
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  4. Ting Zhou
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  5. Jing Li
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Contributions

Formal analysis and investigation: HL; Writing—original, Experimental analysis: LW, Writing—original, Draft preparation: YY; Writing—review and editing: TZ; Visualization: JL. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Ting Zhou.

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Liu, H., Wang, L., Yang, Y. et al. Experimental Analysis of the Mechanical Properties of Austenitic S30408 Stainless Steel Welded Joints at Low Temperatures. Int J Steel Struct 23, 1265–1278 (2023). https://doi.org/10.1007/s13296-023-00765-9

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  • DOI: https://doi.org/10.1007/s13296-023-00765-9

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