Failure Analysis of a 304 Stainless Steel Flange

Jian Shu Lu; Hui Fen Xuan; Jin Xue

doi:10.4028/www.scientific.net/AMR.1120-1121.1024

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 1120-1121Failure Analysis of a 304 Stainless Steel Flange

Failure Analysis of a 304 Stainless Steel Flange

Abstract:

An investigation for the cracking mechanism of a 304 stainless steel flange was carried out. The flange was installed in a (NH₄)₂SO₄ tank . Optical microscopy examination shows that the cracking is intergrainular. SEM examination shows that the brittle nature of the cracked surface morphology. EDS analysis shows that chloride exists on the cracked surface. Electrolytic etching of the stainless steel in oxalic acid solution reveals that it has intergrainular corrosion sensitivity. The results show that poor welding operation caused to form defects in the weld. Corrosion occurred preferentially in the defect area and cracks propagated circumferentially in the weld seam. The crack propagation direction changed at a point where there was a large circumferential stress.

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Periodical:

Advanced Materials Research (Volumes 1120-1121)

Pages:

1024-1028

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1120-1121.1024

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Online since:

July 2015

Authors:

Jian Shu Lu*, Hui Fen Xuan, Jin Xue

Keywords:

Flange, Intergranular Corrosion, Stainless Steel, Stress Corrosion Cracking

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