High Nitrogen Stainless Steel Properties and Processing Techniques
Summary
High nitrogen stainless steels represent a class of alloys in which nitrogen is employed as a principal strengthening and corrosion-resisting element. By stabilising the austenitic phase and refining grain size, nitrogen raises yield strength and work-hardening capacity without resorting to high levels of nickel. Duplex and super-austenitic grades exploit nitrogen to optimise phase balance, enhancing pitting and crevice corrosion resistance in chloride-rich environments. Thermodynamically, nitrogen solubility in γ-Fe is governed by temperature, pressure and alloying additions such as manganese, with high-pressure or powder-metallurgical routes required to exceed solubility limits of conventional melts. Processing techniques encompass high-temperature solution nitriding, gas-solid interaction in powder metallurgy, laser powder bed fusion and conventional heat treatments, each demanding careful control of transformation kinetics, nitride precipitation and grain boundary stability. These advances have opened pathways to low-nickel or nickel-free grades for biomedical implants, marine structures and energy applications, linking fundamental phase-equilibria studies to scalable industrial manufacture.
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High Nitrogen Stainless Steel Properties and Processing Techniques publication trend
The graph below shows the total number of articles in high nitrogen stainless steel properties and processing techniques across all publications each year (not limited to Nature Index journals).
Technical terms
Austenite: A face-centred cubic iron matrix phase stabilised by nitrogen and other austenite-promoting elements.
Ferrite: A body-centred cubic iron phase that coexists with austenite in duplex steels and influences nitriding kinetics.
σ Phase: A brittle intermetallic compound rich in chromium and molybdenum that can precipitate at grain boundaries.
High-Temperature Solution Nitriding (HTSN): A gas-solid process introducing nitrogen into steel at elevated temperatures to form a hardened surface case.
Laser Powder Bed Fusion (L-PBF): An additive manufacturing technique in which a laser selectively melts metal powders to build complex geometries layer by layer.
Johnson–Mehl–Avrami Model: A mathematical description of phase transformation kinetics based on nucleation and growth processes.
References
- Austenitic Stainless Steel Powders with Increased Nitrogen Content for Laser Additive Manufacturing. Metals (2019).
- Influence of N on precipitation behavior and transformation kinetics of super austenitic stainless steels after isothermal ageing at 900 °C. Journal of Materials Research and Technology (2022).
- High Temperature Solution Nitriding of Stainless Steels; Current Status and Future Trends∗. HTM Journal of Heat Treatment and Materials (2020).
- Influence of ferrite-austenite distribution in 2205 duplex stainless steel on high-temperature solution nitriding behaviour. Surface and Coatings Technology (2023).
- NITROGEN STEELS AND HIGH NITROGEN STEELS. INDUSTRIAL TECHNOLOGIES AND PROPERTIES. Izvestiya Ferrous Metallurgy (2019).
- Influence of the PM-Processing Route and Nitrogen Content on the Properties of Ni-Free Austenitic Stainless Steel. Metallurgical and Materials Transactions A (2014).
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