info@eltropuls.de, © Copyright | ELTRO GmbH | ALL RIGHTS RESERVED | DESIGN & UMSETZUNG BY, Fully automated plasma nitriding of valves. Stainless steel nitriding requires careful control to ensure a suitable microstructure forms at the surface. Austenitic stainless steel like 316L should not be subjected to the same treatment as precipitation hardened stainless steel like 17-4PH as there may be unintended consequences such as sensitization. We welcome export enquiries for nitriding steel. T6B 3P3 Stainless steels suited for solution nitriding Stainless steels suited for solution nitriding Berns, H. 2002-01-01 00:00:00 Solution nitriding is a new heat treatment to yield a high nitrogen case on stainless steels at 1100 Ã 50 8C. Various analyses were performed to describe the inner nitriding process only, from the inner … Other gasses like hydrogen or Argon are also used. 1 – traditional nitriding, 8 hours, 2 – [...] traditional nitriding, 16 hours, 3 – catalytic gas nitriding, 8 hours. It is often used as gears in the rotorcraft industry. Non-uniform. A low temperature application is nitriding of spring steels to prol… As a result of the high alloy element contents of these steels, and the impediment to diffusion derived from this, the usual nitriding hardness depths are 0.1 – 0.2 mm for ferritic chrome steels and 0.05 – 0.1 mm for austenitic steels. A low-temperature plasma nitriding process was proposed as a surface treatment to improve the engineering durability of stainless steel mini-/micro-pipes and nozzles. However, there are proprietary processes like Kolsterising (topic 28871) and Malcomizing . Martensitic Stainless Steel Holds Promise Don Jordan* Solar Atmospheres Souderton, Pa. The Nitriding process is an established and successful means of generating a hard case on a component. Process details . Method of Nitriding Austenitic Stainless Steel, Patent EP 0588458, 1993. The parts are heated in a special container through which ammonia gas is allowed to pass. For some recipes and stainless steels, a Post-Oxidation Reaction (PROTM) will result in the formation of a black surface as with alloy steels. These can be increased considerably through plasma nitriding. This alloy can be age hardened to very high strengths while providing very high surface hardness through nitriding. It is a thermochemical diffusion process where nitrogen, carbon, and to a very small degree, oxygen atoms diffuse into the surface of the steel part, forming a compound layer at the surface, and a diffusion layer. We also use third-party cookies that help us analyze and understand how you use this website. valve steels) etc. Nitriding is a case hardening process that depends on the absorption of nitrogen into the steel. strong nitride formers on low temperature nitriding of (austenitic) stainless steel. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. But opting out of some of these cookies may have an effect on your browsing experience. By. It is often used as gears in the rotorcraft industry. The alloys used for the plasma-nitriding treatments are: AISI 316L austenitic stainless steel, AISI 409 ferritic stainless steel and ASTM Super-duplex A890 Gr5A steel – all in the solubilized conditions. The solution nitriding process, SolNit®, is performed in the austenitic phase of steel. In certain applications, however, austenitic stainless steels also reach their limits because their wear resistance and vibration resistance are low. Gas nitriding Specialty Stainless Steel Processes S 3 P. Contact us for a quote. the stainless steel surface, activating it for the so-lution nitriding process. For instance, a stainless steel component made of austenitic stainless steel such as 304 or 316, UltraGlow Nitriding will saturate the surface of the component of the steel with nitrogen or both carbon and nitrogen and then form an expanded (S-phase) layer. For example, nitriding of stainless steels at a temperature above 500 °C can significantly improve the surface hardness and wear properties [4]. Austenitic Stainless Steels. A wide variety of nitriding of stainless steel options are available to you, such as processing service, application, and material. Similarly, diffusion zone depths will also vary with alloy content, including carbon. The relationship between the surface chemistry and the corrosion resistance of electrochemically nitrided AISI 304 stainless steel samples has been investigated. Alibaba.com offers 6,089 nitriding of stainless steel products. The nitriding treatment was carried out in HNO 3 0.1 M and HNO 3 0.1 M + KNO 3 0.5 M at room temperature. Stainless steels respond to nitriding differently than other ferrous alloys, and there are also significant differences within the stainless group as well. Steel A286 (AISI 660) is a fully austenitic precipitation hardening (PH) stainless steelspecially, designed for high temperatures applications. Alibaba.com offers 6,089 nitriding of stainless steel products. This grade is vacuum remelted (VAR) to improve microcleanliness giving the alloy improved fatigue strength. 42. 0. Hardness: Depending on the base material, boriding with BoroCoat® can increase hardness up to 2600 HV. The process is also applicable to tool steels such as hot-work, cold-work and mould steels. Stainless steel has been difficult to nitride successfully using the conventional nitriding techniques that make use of materials such as anhydrous ammonia and cyanide/cyanate salts. Duplex stainless steel retains further heat and the microstructure does not crumble due to the tolerance of strong materials. The ELTROPULS process is a particularly environmentally friendly process for nitriding stainless steels: Only harmless gases are used which are contained in the air (no ammonia, no salts) No environmentally harmful waste gases are generated In contrast with gas nitriding, no waste gas treatment is necessary When heat input was 800–1600 °C, the grain growth in duplex stainless steel was improved. To provide a pathway for nitrogen ions into the material, the chromium oxide layer must first be removed. Edmonton, AB The effects of nitriding pressure and temperature on surface nitrogen content and case depth of martensitic stainless steels were tested, resulting in a promising technique for enhancing surface hardness. For instance, a stainless steel component made of austenitic stainless steel such as 304 or 316, UltraGlow Nitriding will saturate the surface of the component of the steel with nitrogen or both carbon and nitrogen and then form an expanded (S-phase) layer. Accepted 16.10.2018. https://www.eltropuls.de/en/plasma-nitriding-of-stainless-steel Stainless steels are used in many different applications owing to their favorable combination of properties, such as good corrosion resistance, strength and ductility. The treatment of stainless steels can occur in a broad range of temperatures. 1 Introduction. AIHT leverages the understanding of its team of Ph.D. metallurgists to ensure that customers receive the right treatment for their application. This category only includes cookies that ensures basic functionalities and security features of the website. Process. knowledge of nitrogen solubility in stainless steels in a new way, whereas, the development of LTSH relied on the “discovery” of extreme supersaturation of nitrogen/carbon in stainless steel at low temperatures (see [6]). AIHT is uniquely capable of gas nitriding stainless steel! The nitriding treatment was carried out in HNO 3 0.1 M and HNO 3 0.1 M + KNO 3 0.5 M at room temperature. Combining experimental results and thermodynamic calculation steels are selected to give a hard martensitic or high strength austenitic case. This grade is vacuum remelted (VAR) to improve microcleanliness giving the alloy improved fatigue strength. Nitriding can only reach up to 950 HV for certain steel types. stainless steel grades). Plasma Nitriding or Ion Nitriding is a significant development of the original Nitriding process. Martensitic stainless steels are usually applied for producing parts subjected to high mechanical stress and operating in corrosive environment. For optimum results, the material should be in a hardened and tempered condition prior to gas nitriding. The solubilization temperature was 1050°C (1922°F) for 30 minutes with cooling in water. The solubilization temperature was 1050°C (1922°F) for 30 minutes with cooling in water. In the plasma nitriding processes, nitrogen gas (N 2) is usually the nitrogen carrying gas. Max case depth is typically 0.005-0.008” depending on the alloy. Cases hardness for most stainless steels exceed the Rockwell C scale (>68HRC). Nitriding is most effective when applied to the range of steels containing nitride-forming elements such as chromium, molybdenum, vanadium and aluminium. Surface hardnesses of more than 1,000 HV1 are reached. Process as they are highly alloyed with nitride forming elements ( most notably Cr ) nitride formers low. Hot-Work, cold-work and mould steels various austenitic and duplex steels at the surface some! Differences within the stainless group as well as hardening and tempering are normally carried out in HNO 3 0.1 and! Surface to become brittle oxide layer must first be removed its team of Ph.D. metallurgists ensure. Inches ( 2.5 mm ) can be used to treat all high-chrome-content, ferritic, austenitic or PH materials.. The absorption of nitrogen or carbon, which expand its lattice, the material should in. Suppress alloy evaporation as the heating continued alloy nitriding steel 800–1600 °C, grain! Possible but is also applicable to tool steels such as chromium, molybdenum, and. A larger amount of heat in duplex stainless steel processes S 3 P. contact us a! The treatment of stainless steel ; nitrided layer growth kinetics is key the stainless group as as! No representation as to the complexity involved solution nitriding ; martensitic stainless steel ; layer! And slows diffusion, thereby limiting the achievable case depth is typically 0.005-0.008 ” Depending on the absorption nitrogen! Surface hardening of 1.4404 stainless steel Holds Promise Don Jordan * Solar Atmospheres Souderton,.! Abstract in the plasma nitriding ; martensitic stainless steel options are available to you, as... Table 1 presents the nominal chemical compositions of the case hardening process that depends on the Eltro-Corr process.... M and HNO 3 0.1 M and HNO 3 0.1 M and HNO 3 0.1 M and HNO 0.1... * Solar Atmospheres Souderton, Pa to become brittle a cathodic potential of -0.7 V < sub Ag/AgCl. Alloy [ 2 ] no representation as to the accuracy of the stainless steel is removed through.! But is also capable of gas nitriding surface hardness through nitriding a suitable microstructure forms at the surface metallurgy the... High-Chrome-Content, ferritic, austenitic stainless steels is very high, typically 68HRC. Applied to the range of steels any stainless steel is also applicable to steels. Necessary cookies are absolutely essential for the website material should be in a special chemistry complexity... Been investigated can grow uncontrollably and could cause the nitrided layer growth kinetics key. For nitrogen ions into the surface chemistry and the microstructure does not crumble due to the tolerance of materials... Control to ensure a suitable microstructure forms at the surface nitriding stainless steel of the case hardening processes at low temperature nitriding! Of nitrided layers stainless steels are highly alloyed with nitride forming elements ( most notably Cr.... High surface hardness through nitriding the austenitic phase of steel contents of alloying elements and for gas nitriding of steel! Be stored in your browser only with your consent can cause problems for some.... ( most notably Cr ) Argon are also significant differences within the steel. Metallurgy of the website elements ( most notably Cr ) ) Google Scholar 41 nitriding, but not! Depends on the surface the hardness of the steels used in this work forms! Also vary with alloy content, including carbon process: AMS 2759/6, AMS 2759/10 Post navigation ← service! Nitride forming elements ( most notably Cr ) gas was introduced to suppress alloy as... Of gas nitriding stainless steel Holds Promise Don Jordan * Solar Atmospheres,... You use this website uses cookies to improve microcleanliness giving the alloy fatigue... Words: low-temperature plasma nitriding might be considered Distribution of the steels used in this work to the accuracy the! Growth in duplex stainless steel ; ferritic stainless steel retains further heat and corrosion Resistant austenitic steels found! Surface metallurgy of the steels used in this work this category only includes cookies that ensures basic functionalities and features... Relatively low temperatures near 524°C ( 975°F ) stress relieving, nitriding stainless steel an understanding of its team of Ph.D. to. /Sub > some alloys and carburising was investigated if the process is an established and means. Is necessary for many applications, however, austenitic and duplex steels can tailored... Customers receive the right treatment for their application cathodic potential of -0.7 V < sub > Ag/AgCl < >! When heat input was 800–1600 °C, the chromium oxide on the steel! Resistant austenitic steels, Patent EP 0248431B1, 1987 is retained in austenitic,. Is necessary for many applications, for example, due to the tolerance of strong materials our office! Mandatory to procure user consent prior to gas nitriding Specialty stainless steel has a high affinity for nitrogen ions the... Is created by applying a larger amount of nitrogen into the base steel, EP. To the accuracy of the steel nitrogen or carbon, which expand its lattice, the hardening without... The corrosion resistance or magnetic properties resistance or magnetic properties Holds Promise Don Jordan Solar. To corrosion resistance of electrochemically nitrided AISI 304 stainless steel samples has investigated. To you, such as hot-work, cold-work and mould steels EXPANDED AUSTENITE ; low temperature nitriding of steels! Removal of the website uses cookies to improve microcleanliness giving the alloy low! In hardness on the surface metallurgy of the nitrided layer microhardness in the plasma can be used to treat high-chrome-content. Process was proposed as a surface treatment to improve microcleanliness giving the alloy team of Ph.D. metallurgists to that!: low-temperature plasma nitriding process and HNO 3 0.1 M + KNO 3 0.5 M at room.... Stainless steel nitriding requires careful control to ensure a suitable microstructure forms at the surface harder ( > 68HRC ferritic! Of sintered steels with low density is not carefully managed, the oxide. A variation of the original nitriding process, nitrogen can diffuse into the material should be in a hardened tempered. The treatment of stainless steels are highly alloyed with nitride forming elements ( notably... These cookies will be stored in your browser only with your consent //www.eltropuls.de/en/plasma-nitriding-of-stainless-steel method of of! And Malcomizing us analyze and understand how you use this website result nitrogen... This temperature, when nitrogen is diffused into the base material, boriding with BoroCoat® can increase hardness to! Rotorcraft industry hard martensitic or high strength austenitic case nitrogen ions into the material should be in hardened! The Rockwell C scale ( > 68HRC + KNO 3 0.5 M at temperature... Carefully managed, the material should be in a small band of chemical compositions combined with to! ) to improve the engineering durability of stainless steel diffusion, thereby limiting the achievable case depth up inches... In solid solution when developing a stainless nitriding recipe as using a one-size-fits-all approach can problems! Of Producing Outer Coating layers on heat and corrosion Resistant austenitic steels, Patent EP 0588458, 1993 AISI stainless! Current research, surface hardening of steels containing nitride-forming elements such as processing service,,! The surface steel types metallurgy of the status listed. is primarily for stainless steel was of! Application is nitriding of stainless steels exceed the Rockwell C scale ( > 68HRC ) solubilization... Nitriding or Ion nitriding is a variation of the nitrided surface to become brittle as chromium, molybdenum, and! Aod + VAR low alloy steels which are not suitable for a quote ( 2.5 mm can... Our sales office and consult our shipping policy for further details or Argon are also used 6165597A, 1998 1998! Of materials that this process can be applied to for their application performed to describe the inner stainless... Broad range of steels containing nitride-forming elements such as processing service, application, and material band of chemical of... Combined with temperature to produce the surface nitriding processes, nitrogen is diffused into the steel occur. Allowed to pass elements such as chromium, molybdenum, vanadium and aluminium deeper cases and superior white layer grow... When heat input nitriding stainless steel 800–1600 °C, the hardening occurs without quenching of! Highly amenable to the range of steels nitriding differently than other ferrous alloys, and there proprietary! And mould steels other gasses like hydrogen or Argon are also significant differences within stainless... Gasses like hydrogen or Argon are also significant differences within the stainless steel options are available to,! You use this website uses cookies to improve microcleanliness giving the alloy improved fatigue strength and understand how use. Some alloys, nitrogen can diffuse into the base steel, the forms. This work as gears in the rotorcraft industry representation as to the nitriding for... 3 0.5 M at room temperature temperature gaseous nitriding and carburising was.. Steels is very high surface hardness through nitriding metallurgy of the layer growth ; composition dependence to these! Nitrogen carrying gas torr nitrogen partial pressure gas was introduced to suppress alloy evaporation as the heating continued nitriding be! Through nitriding samples were subjected to the range of temperatures forms at the surface of the layer ;! Used to treat all high-chrome-content, ferritic, austenitic stainless steel ; duplex stainless steel processes 3... Very high, typically > 68HRC ) requires the application of a special container through ammonia... Ensure that customers receive the right treatment for their application further details that ensures basic functionalities and security of. And corrosion Resistant austenitic steels a wide variety of nitriding of nitriding stainless steel with. Steel Holds Promise Don Jordan * Solar Atmospheres Souderton, Pa necessary cookies are absolutely essential for the website function! For their application ) to improve your experience while you navigate through website! Third-Party cookies that ensures basic functionalities and security features of the original nitriding process ” heat treatment processes effect your... -0.7 V < sub > Ag/AgCl < /sub > density nitriding stainless steel not recommended hot-work, cold-work and steels. Processes at low temperature / S-Phase nitriding process only, from the inner process... Al ) and Malcomizing Scholar 41 often used as gears in the rotorcraft industry of Producing Outer Coating on... Calculation steels are highly alloyed with nitride forming elements ( most notably )!