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Gas nitriding

Home > Services > Heat treatment > Case hardening without subsequent hardening operation > Gas nitriding
  • Services
    • Heat treatment
      • Case hardening with subsequent hardening operation
        • Atmospheric carburising
        • Low pressure carburising (LPC)
        • Boriding
        • Carbonitriding
      • Case hardening without subsequent hardening operation
        • Corr-I-Dur®
        • Plasma nitriding/Ion nitriding
        • Nitrocarburising
        • Gas nitriding
        • Ferritic nitrocarburising
        • Fluidised bed/salt bath nitriding/nitrocarburising
      • Hardening and tempering
        • Neutral hardening
        • Ausbay quenching
        • Austempering
        • Martempering/Marquenching
        • Press quenching
        • Induction hardening
        • Double hardening
        • Tempering
      • Solution and age
        • Solution and age: Aluminium alloys
        • Solution and age: Nickel alloys
        • Precipitation hardening: Stainless steels
      • Specialty Stainless Steel Processes (S3P)
      • Annealing / Normalising
        • Annealing
        • Recrystallisation
        • Normalising
        • Sub-critical annealing / intercritical annealing
        • Soft annealing
      • Ion implantation
      • Stress relieving
    • Metal joining
      • Furnace/vacuum brazing
      • Induction brazing
      • Electron beam welding
      • HIP diffusion bonding
      • Hydrogen brazing
    • Surface technology
      • Plasma spray
      • High Velocity Oxygen Fuel (HVOF) coating
      • Combustion spraying
      • Vapor phase aluminide (VPA)
      • K-Tech
      • Liquid coatings
      • Anodising
      • Electric arc wire
      • Ceramic coatings
      • Flame spraying
    • Hot isostatic pressing
      • Powdermet® technologies
        • Powdermet® hybrid* with 3D printing
        • Powdermet® 3D printing
        • Powdermet® – Near net shape (NNS)
        • Powdermet® Selective surface net shape (SSNS)
      • Isostatic pressing services
        • Hot isostatic pressing
        • Casting densification
        • HIP cladding
        • HIP brazing
        • Simple shape
      • HIP supporting services
        • Laboratory services for HIP
        • Simulation and analysis

Gas nitriding

Gas nitriding is a thermochemical case hardening process used to increase wear resistance, surface hardness and fatigue life by dissolution of nitrogen and hard nitride precipitations.

Benefits of gas nitriding

Favoured for components that are subjected to heavy loading, nitriding imparts a high surface hardness which promotes high resistance to wear, scuffing, galling and seizure. Fatigue strength is increased mainly by the development of surface compressive stresses. The wide range of possible temperatures and case depths, which allow adjustment of different properties of the treated parts, give gas nitriding a broad field of applications.

Application & materials

Typical applications include gears, crankshafts, camshafts, cam followers, valve parts, springs, extrusion screws, die-cast tooling, forging dies, aluminium-extrusion dies, injectors and plastic-moulds.

Nitriding is most effective when applied to the range of steels containing nitride-forming elements such as chromium, molybdenum, vanadium and aluminium. The process is also applicable to tool steels such as hot-work, cold-work and mould steels. A low temperature application is nitriding of spring steels to prolong the fatigue life of springs for automotive use. In general, all ferrous materials can be gas nitrided up to 5% chromium. For higher contents of alloying elements and for gas nitriding of stainless steel, plasma nitriding might be considered. Gas nitriding of sintered steels with low density is not recommended.

For optimum results, the material should be in a hardened and tempered condition prior to gas nitriding.

Gas nitriding process details

Gas nitriding is a low temperature (typically 520°C/970°F), low distortion “thermochemical” heat treatment process carried out to enhance the surface properties of finished or near finished ferrous components. If a carbon spending gas is added, the process is called gas nitrocarburising. The layer usually consists of two zones – the compound layer (white layer) which can be a cubic or hexagonal nitride and the diffusion layer below with dissolved nitrogen and hard nitride precipitations. The compound layer on the surface of the parts is responsible for the major benefit of high resistance to wear, scuffing, galling and seizure. The diffusion layer contributes improved fatigue strength and works as a support for the hard compound layer. By controlling and adjusting the process atmosphere, the constitution of the layer can be influenced from thin compound layers for fatigue strength improvement to thick nitrogen and carbon rich compound layers in case of gaseous nitrocarburising and post oxidation if good wear and corrosion resistance is desired. In this case Corr-I-Dur® might be considered as the preferred choice.

Related Services
Plasma nitriding/Ion nitriding
Ferritic nitrocarburising
Corr-I-Dur®
Fluidised bed/salt bath nitriding/nitrocarburising
Specialty Stainless Steel Processes S3P
Contact us for a quote.

Gas nitriding

Gas nitriding is a thermochemical case hardening process used to increase wear resistance, surface hardness and fatigue life by dissolution of nitrogen and hard nitride precipitations.

Benefits of gas nitriding

Favoured for components that are subjected to heavy loading, nitriding imparts a high surface hardness which promotes high resistance to wear, scuffing, galling and seizure. Fatigue strength is increased mainly by the development of surface compressive stresses. The wide range of possible temperatures and case depths, which allow adjustment of different properties of the treated parts, give gas nitriding a broad field of applications.

Application & materials

Typical applications include gears, crankshafts, camshafts, cam followers, valve parts, springs, extrusion screws, die-cast tooling, forging dies, aluminium-extrusion dies, injectors and plastic-moulds.

Nitriding is most effective when applied to the range of steels containing nitride-forming elements such as chromium, molybdenum, vanadium and aluminium. The process is also applicable to tool steels such as hot-work, cold-work and mould steels. A low temperature application is nitriding of spring steels to prolong the fatigue life of springs for automotive use. In general, all ferrous materials can be gas nitrided up to 5% chromium. For higher contents of alloying elements and for gas nitriding of stainless steel, plasma nitriding might be considered. Gas nitriding of sintered steels with low density is not recommended.

For optimum results, the material should be in a hardened and tempered condition prior to gas nitriding.

Gas nitriding process details

Gas nitriding is a low temperature (typically 520°C/970°F), low distortion “thermochemical” heat treatment process carried out to enhance the surface properties of finished or near finished ferrous components. If a carbon spending gas is added, the process is called gas nitrocarburising. The layer usually consists of two zones – the compound layer (white layer) which can be a cubic or hexagonal nitride and the diffusion layer below with dissolved nitrogen and hard nitride precipitations. The compound layer on the surface of the parts is responsible for the major benefit of high resistance to wear, scuffing, galling and seizure. The diffusion layer contributes improved fatigue strength and works as a support for the hard compound layer. By controlling and adjusting the process atmosphere, the constitution of the layer can be influenced from thin compound layers for fatigue strength improvement to thick nitrogen and carbon rich compound layers in case of gaseous nitrocarburising and post oxidation if good wear and corrosion resistance is desired. In this case Corr-I-Dur® might be considered as the preferred choice.

Related Services
Plasma nitriding/Ion nitriding
Ferritic nitrocarburising
Corr-I-Dur®
Fluidised bed/salt bath nitriding/nitrocarburising
Specialty Stainless Steel Processes S3P
Contact us for a quote.
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  • Home
  • Careers
    ▼
    • Opportunities (Europe & Asia)
    • Opportunities (North America)
  • Services
    ▼
    • Heat treatment
      ▼
      • Case hardening with subsequent hardening operation
        ▼
        • Atmospheric carburising
        • Low pressure carburising (LPC)
        • Boriding
        • Carbonitriding
      • Case hardening without subsequent hardening operation
        ▼
        • Corr-I-Dur®
        • Plasma nitriding/Ion nitriding
        • Nitrocarburising
        • Gas nitriding
        • Ferritic nitrocarburising
        • Fluidised bed/salt bath nitriding/nitrocarburising
      • Hardening and tempering
        ▼
        • Neutral hardening
        • Ausbay quenching
        • Austempering
        • Martempering/Marquenching
        • Press quenching
        • Induction hardening
        • Double hardening
        • Tempering
      • Solution and age
        ▼
        • Solution and age: Aluminium alloys
        • Solution and age: Nickel alloys
        • Precipitation hardening: Stainless steels
      • Specialty Stainless Steel Processes (S3P)
      • Annealing / Normalising
        ▼
        • Annealing
        • Recrystallisation
        • Normalising
        • Sub-critical annealing / intercritical annealing
        • Soft annealing
      • Ion implantation
      • Stress relieving
    • Metal joining
      ▼
      • Furnace/vacuum brazing
      • Induction brazing
      • Electron beam welding
      • HIP diffusion bonding
      • Hydrogen brazing
    • Surface technology
      ▼
      • Plasma spray
      • High Velocity Oxygen Fuel (HVOF) coating
      • Combustion spraying
      • Vapor phase aluminide (VPA)
      • K-Tech
      • Liquid coatings
      • Anodising
      • Electric arc wire
      • Ceramic coatings
      • Flame spraying
    • Hot isostatic pressing
      ▼
      • Powdermet® technologies
        ▼
        • Powdermet® hybrid* with 3D printing
        • Powdermet® 3D printing
        • Powdermet® – Near net shape (NNS)
        • Powdermet® Selective surface net shape (SSNS)
      • Isostatic pressing services
        ▼
        • Casting densification
        • HIP cladding
        • HIP brazing
        • Simple shape
      • HIP supporting services
        ▼
        • Simulation and analysis
        • Laboratory services for HIP
  • Markets
    ▼
    • Automotive
      ▼
      • Car / Light truck
      • Heavy trucks
      • Motorbikes
      • Motorsports
    • Aerospace & defense
      ▼
      • Commercial jet
      • Military fighter
      • Helicopter
      • Armoury and munitions
      • Space
    • Energy
      ▼
      • Stationary turbines
      • Nuclear
      • Oil and gas
      • Renewables
    • General industrial
      ▼
      • Tooling
      • Agriculture and forestry
      • Construction and civil engineering
      • Mining
      • Rail and marine
      • Consumer products
      • Electronics and telecommunications
      • Medical, health and environmental
      • Food and beverage
      • Chemical and paper
      • Machine building
  • News and media
    ▼
    • Press releases
    • Downloads
    • Multimedia resources
      ▼
      • Images
    • Media contact
    • More news
    • History Of Metallurgy
  • Corporate responsibility
    ▼
    • Our approach
    • Environment
    • Our policies
    • Safety
    • Society
    • Workplace
    • Gender pay gap
  • Investors
    ▼
    • Our values
    • Our strategy
    • Our performance
    • Our business
      ▼
      • Key facts
      • What we do
      • Our marketplace
      • Business segments
        ▼
        • The ADE Divisions
        • The AGI divisions
      • Thermal processing sector overview
    • Governance
      ▼
      • Governance structure
      • Leadership
      • Internal control and risk management
      • Open door policy
      • Our policies
      • Where we operate
    • Our board
    • Reports and results
    • Financial information
      ▼
      • Five year summary
      • Group income statement
      • Balance sheet
      • Cash flow
    • Share price and dividend information
      ▼
      • Detailed share price
      • Dividend history
      • Charting tools
        ▼
        • Share price chart
        • Shareholder returns
      • Historic calculator and look-up
      • Share price download
    • Regulatory announcements
    • Financial calendar
    • Investor presentations
    • Shareholder information
      ▼
      • Dividend information
      • Shareholder forms
      • AGM details
      • Electronic proxy voting
      • Share dealing
      • Major shareholders
    • Investor and shareholder contacts
    • Anti-Slavery and Human Trafficking Statement
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