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doi:https://doi.org/10.5781/JWJ.2019.37.4.6    [Epub ahead of print]
Effect of Carbon Content on Intergranular Corrosion of Welding Heat Affected Zone in 304 Stainless Steel
Eun-Jong Oh*, Jae-Hyung Lee*, Sung-Woo Cho*, Won-Geun Yi**, Ki-Woo Nam***
*Nuclear Business Group, Doosan Heavy Industries & Construction Co. Ltd., Changwon, 51711, Korea
**Corporate R&D Institute, Doosan Heavy Industries & Construction Co. Ltd., Changwon, 51711, Korea
***Depart. of Materials Science & Engineering, Pukyong National University, Busan, 48513, Korea
Correspondence: Eun-Jong Oh  Email: eunjong.oh@doosan.com
Received October 29, 2018  Accepted June 17, 2019  Published online July 22, 2019
ABSTRACT
304 stainless steels with carbon contents of 0.074wt%C and 0.064wt%C were tested to investigate the effect of carbon content on intergranular corrosion in the heat affected zone. Stainless steels with two types of carbon content were subjected to various tests to identify characteristics such as nondestructive properties, mechanical properties, chemical composition, delta ferrite content, and structural observation. In the ASTM A262 test for detecting the intergranular attack associated with chromium carbide precipitates, 304 stainless steel with a carbon content of 0.064wt%C was found to be resistant to intergranular corrosion, but 304 stainless steel with a high carbon content of 0.074wt%C was found to have intergranular corrosion in the heat affected zone 2 to 3 mm away from the fusion line. Using temperature distribution analysis it was confirmed that the 2 to 3 mm point at the fusion line persists for approximately 3 to 6 seconds at the sensitivity temperature range of 650~870℃. This result confirmed the corrosion test results of the 304 stainless steel with a high carbon content of 0.074wt%C. Therefore, the carbon content of stainless steel to be employed industrial field welding needs to be limited to a maximum 0.065wt%C in order to ensure the corrosion resistance of 304 series stainless steel in a corrosive environment.
Keywords: Stainless steel | Carbon content | Intergranular corrosion | Heat affected zone
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