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Abstract
In our research butt welds were made on newly developed LDX 2404 lean duplex stainless steel grade with gas metal arc welding. For root protection three different backing gases were used: pure argon, 95 vol% nitrogen + 5 vol% hydrogen and pure nitrogen. In case of pure nitrogen backing the effect of different gas flow rates was also investigated. Based on our research, the nitrogen content in the backing gas resulted in increasing austenite content. The increasing nitrogen content in backing gas and the increasing austenite content resulted in increasing pitting corrosion resistance. The flow rate of the backing gas also has significant effect on the evolving microstructure and pitting corrosion resistance.
Highlights
High strength and novel corrosion resistant steels gain more attention in chemical, offshore and pulp industries [1–9]
In our research butt welds were made on newly developed LDX 2404 lean duplex stainless steel grade with gas metal arc welding
In case of pure nitrogen backing the effect of different gas flow rates was investigated
Summary
High strength and novel corrosion resistant steels gain more attention in chemical, offshore and pulp industries [1–9]. Because of the recent fluctuations in nickel and molybdenum prices of metal stock market, steel industries have developed new types of stainless steels with lower nickel and higher manganese and nitrogen alloying contents [16–18]. These special types of new DSS called “lean” duplex, indicating their lower nickel content [19–22]. Lean DSS gaining more attention due to their high mechanical strength and corrosion resistance and lower price compared to the conventional DSS grades, such as EN 1.4462 (UNS S31803). Westin et al [36–38] published their results on nitrogen, argon + nitrogen and nitrogen + hydrogen backing gas effects on the corrosion resistance and microstructure of conventional, lean and super DSS grades. The effect of different backing gas flow rates were investigated and found to have an effect on the evolving microstructure
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