The Effect of Nitrogen on the Localized Corrosion Resistance of Duplex Stainless Steel Simulated Weldments

Tsuge, H.; Tarutani, Yutaka; Kudo, Takeo

doi:10.5006/1.3583942

Cited by 49 publications

(21 citation statements)

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“…12 The resistance to intergranular corrosion of the simulated HAZ was evaluated in copper sulfate-sulfuric acid solution, whose test resuits are presented in Table 2. When the a-content was more than 80%, which was caused on the low nickel alloy with 3.5%, and the low nitrogen alloys with 0.04% and 0.08%, those alloys suffered intergranar corrosion.…”

Section: Discussionmentioning

confidence: 99%

Stress Corrosion Cracking Resistance of 22%Cr Duplex Stainless Steel in Simulated Sour Environments

1989

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Effect of nickel and nitrogen contents on stress corrosion cracking (SCC) of 22%Cr-3%Mo-base duplex stainless steel was investigated in simulated sour environments with respect to both the base metal and the heat-affected zone (HAZ) of welding. The threshold stress and the critica) chloride concentration for SCC ware evaluated as a function of the ferrite content (a-content) in the alloy. The threshold stress is highest at the a-content of 40 to 45%, and is lowered with decreasing and increasing the a-content from its value. The alloy whose a-content exceeds 80% at the HAZ has also high susceptibilities to pitting corrosion and intergranular corrosion (IGC). The critica) chloride concentration for cracking increases with the decrease in the a-content. Moreover, the contents of chromium, nickel and molybdenum in the a-phase are considered to be an important factor for determining the critica) chloride concentration.KEY WORDS: duplex stainless steel, sour environment, stress corrosion cracking. ABSTRACTThe effect of Cr, Ni, and Mo contents of Ni-base alloy on the corrosion behavior in H2S-0O2-C1 environment with elemental sulfur at elevated temperature was investigated. The environmental with elemental sulfur was more corrosive than that without elemental sulfur. The stress corrosion cracking (SSC) resistance of Ni-base alloys increases with increasing Ni and especially Mo contents. The main effect of the elemental sulfur is considered that the generation of H2S due to the cathodic reaction of elemental sulfur at a location underneath sulfur deposftion, which is related to the viscosity of elemental sulfur. Recommendable chemical composition of Ni-base alloys in H2S-CO2-C1--S environment was proposed trom the view points of phase stability, stress corrosion cracking, and hydrogen embrittlement (HE). Suitable high-Ni alloys had more than 12%Mo and 15%Cr and the phase stability parameter (Md) value below 0.911.

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Section: Discussionmentioning

confidence: 99%

Stress Corrosion Cracking Resistance of 22%Cr Duplex Stainless Steel in Simulated Sour Environments

1989

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“…9 Thus, they observed that when exposed to a NaCI solution, a 22%Cr-3%Mo duplex SS with 0.14%N, initially pitted preferentially in the austenite while another duplex with 0.16% N initiated pitting randomly both in the austenite and in the ferrite. partitioning of N may also explain why corrosion occurs preferentially in the ferrite in chloride environments and in the austenite, when in the non-chloride environments.…”

Section: 006% (Alloy 13684)mentioning

confidence: 94%

Effects of Nitrogen on the Selective Dissolution of a Duplex Stainless Steel

Sridhar

Kolts

1987

CORROSION

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Nitrogen (N) has been shown to exert a beneficial influence on localized corrosion resistance of austenitic stainless steels. With duplex stainless steels (SSs), N plays a dual role of controlling the austenite to ferrite ratio and increasing corrosion resistance. In addition, on rapid cooling from high temperatures, N can form deleterious precipitates in the ferrite reducing corrosion resistance. The corrosion resistance and corrosion modes are quite different in N and non-N duplex SSs. These differences are illustrated for a 25%Cr duplex SS.

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“…Nitrogen is known to be a strong austenite stabilizer and its presence can lead to a solid solution strengthening [3][4][5] and a lower stacking fault energy [6,7], increasing subsequently the strength of the steels. The nitrogen alloying can also play an important role in retarding the precipitation of intermetallic compound [8,9], raising the ferrite/austenite transformation temperature and assisting the formation of the austenite phase in the heat affected zone (HAZ) of a weldment [10]. Most important, the alloying of nitrogen into the stainless steels can greatly improve the passivation, and increase the pitting corrosion resistance in aqueous environments [11].…”

Section: Introductionmentioning

confidence: 99%

Determination of nitrogen partitioning coefficients in superduplex stainless steels by NRA using a nuclear microprobe

Muñoz

Morilla

López

et al. 2009

Nuclear Instruments and Methods in Physics Research Section B:

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The Effect of Nitrogen on the Localized Corrosion Resistance of Duplex Stainless Steel Simulated Weldments

Cited by 49 publications

References 0 publications

Stress Corrosion Cracking Resistance of 22%Cr Duplex Stainless Steel in Simulated Sour Environments

Stress Corrosion Cracking Resistance of 22%Cr Duplex Stainless Steel in Simulated Sour Environments

Effects of Nitrogen on the Selective Dissolution of a Duplex Stainless Steel

Determination of nitrogen partitioning coefficients in superduplex stainless steels by NRA using a nuclear microprobe

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