Fabrication of high nitrogen austenitic stainless steels with excellent mechanical and pitting corrosion properties

2009 ◽  
Vol 16 (4) ◽  
pp. 387-392 ◽  
Author(s):  
Hua-bing Li ◽  
Zhou-hua Jiang ◽  
Yang Cao ◽  
Zu-rui Zhang
Keyword(s):  
Pitting Corrosion ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
High Nitrogen ◽  
Corrosion Properties

scholarly journals Enhancement of Corrosion Properties of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) Austenitic Stainless Steels by Carbon Alloying

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1124
Author(s):  
Daun Byeon ◽  
Heon-Young Ha ◽  
Sung-Dae Kim ◽  
Hyo-Haeng Jo ◽  
JinJong Lee ◽  
...  
Keyword(s):  
Passive Film ◽  
Pitting Corrosion ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Partial Substitution ◽  
Corrosion Properties ◽  
Resistance Level ◽  
Aisi 304 ◽  
Pitting Corrosion Resistance ◽  
C And N

In this study, the resistance to pitting corrosion of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) austenitic stainless steel γ-SSs (in wt%) with different C/(C + N) ratios (0.02, 0.29, and 0.60) was evaluated. It was found to be difficult to form a γ-matrix without precipitation, because the Cr23C6 precipitation rate in the γ-SSs with the C/(C + N) value of 0.60 was too fast. Thus, it was recommended to maintain the C/(C + N) ratio below 0.6 in Fe-18Cr-9Mn-5.5Ni-0.3(C + N) γ-SSs. As a result of the potentiodynamic polarization tests, the γ-SS with a C/(C + N) ratio of 0.29 showed the highest resistance to pitting corrosion, and the resistance level of this alloy was superior to that of the AISI 304 γ-SS. Analysis of the passive film and matrix dissolution rates revealed that a higher C/(C + N) ratio of γ-SS increased the protective ability of the passive film and decreased the growth rate of the pits. Therefore, it could be concluded that partial substitution of C for N was advantageous for improving the pitting corrosion resistance of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) γ-SSs, as long as C and N existed in a solid solution state.

scholarly journals Brittle-to-Ductile Transition in Nickel-Free Austenitic Stainless Steels with High Nitrogen

2012 ◽  
Vol 98 ◽  
pp. 237-244 ◽  
Author(s):  
Masaki Tanaka ◽  
Tatsuro Onomoto ◽  
Toshihiro Tsuchiyama ◽  
Kenji Higashida
Keyword(s):  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
High Nitrogen ◽  
Brittle To Ductile Transition

scholarly journals Comparison of Corrosion Resistance in Physiological Saline Solution of Two Austenitic Stainless Steels – 316LV and REX734

2017 ◽  
Vol 11 (2) ◽  
pp. 91-95 ◽  
Author(s):  
Eliza Romańczuk ◽  
Zbigniew Oksiuta
Keyword(s):  
Corrosion Resistance ◽  
Stainless Steels ◽  
Saline Solution ◽  
Austenitic Stainless Steels ◽  
Physiological Saline ◽  
Nacl Solution ◽  
Corrosion Properties ◽  
Physiological Saline Solution ◽  
Superior Corrosion Resistance ◽  
Lower Nickel

AbstractIn this work two austenitic stainless steels, REX734 and 316LV were tested in terms of their microstructure and corrosion properties. The REX734 is a newer generation stainless steel, with modified chemical composition, in comparison to the 316LV grade. Potentiodynamic study of corrosion resistance was conducted in physiological saline solution (0.9% NaCl solution). In spite of the similarities of microstructure, grain size and phase structure in both materials, the corrosion tests revealed that the REX734, with lower nickel and higher nitrogen content, had better corrosion resistance than 316LV. Repassivation potential in the REX734 was almost six times higher than for the 316LV steel. Superior corrosion resistance of the REX734 steel was also confirmed by surface observations of both materials, since bigger and more densely distributed pits were detected in 316LV alloy.

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