What We Offer
Comprehensive heat treatment and surface engineering solutions tailored to your industry needs.
Surface hardness & fatigue resistance
FNC process for wear & corrosion
Case hardening for steel parts
Through & selective hardening
Toughness & stress relief
Salt bath nitriding process
Corrosion resistance layer
Bainite transformation
BOSCH TEM P80 — 3000°C burst
Polyamide anti-friction coating
Service 01
Gas Nitriding is a thermo-chemical surface hardening process where nitrogen is diffused into the surface of steel components at sub-critical temperatures (typically 500–590°C) in a controlled ammonia gas atmosphere.
Unlike carburizing, no quenching is required — the component retains its dimensional stability, making it ideal for precision parts that cannot tolerate distortion.
Inward Inspection & Documentation
Alkaline / Ultrasonic Washing
Charge Preparation & Fixturing
Gas Nitriding Cycle (NH₃ atmosphere)
Optional Oxidation Post-Treatment
Metallurgical Inspection & Dispatch
Excellent surface hardness (700–1200 HV)
Improved fatigue life and wear resistance
Minimal distortion — no quenching needed
Enhanced corrosion resistance (with oxidation)
Anti-scuffing and anti-seize properties
Service 02
Gas Based Ferritic Nitrocarburizing is a thermo-chemical surface hardening and corrosion resistance process which involves diffusion of Nitrogen & Carbon into the sub-surface of steel.
In this process, Ammonia & Carbonous Gases like CO₂ and Methane are used to produce a thin case of Iron Nitrocarbide Layer followed by a diffusion zone where Nitrogen & Carbon are dissolved in the base metal.
Components are cleaned and loaded into the sealed furnace
NH₃ + CO₂/CH₄ gases introduced at 570–620°C
Compound layer (white layer) forms at surface — 5–20μm
Diffusion zone extends 0.1–0.8mm with dissolved N & C
Optional oxidation step further improves corrosion resistance
Significantly increases fatigue properties
Enhanced wear resistance, anti-seize, anti-scuffing
Oxidation improves corrosion resistance to higher extent
No dimensional change — no quenching required
Suitable for both ferrous steels and cast iron
Service 03
Gas Carburizing is a case-hardening process in which carbon is diffused into the surface of low-carbon steel at temperatures typically between 850–950°C in a carbon-rich gaseous environment.
After carburizing, components are quenched (oil or polymer) to form a hard, wear-resistant martensitic case while maintaining a tough, ductile core.
Inward Inspection
Charge Preparation & Pre-Washing
Pre-Heating
Carburizing & SQF Quenching
Tempering & Post-Wash
Metallurgical Inspection, Packaging & Dispatch
High surface hardness (58–65 HRC)
Tough ductile core for impact loading
Controlled case depth from 0.1mm to 3mm+
Excellent for high-contact-stress applications
Service 04
Hardening involves heating steel above its critical temperature (austenitizing) followed by rapid quenching in oil or polymer to transform the microstructure to martensite — achieving maximum hardness.
We offer both through hardening and selective hardening capabilities with quench tanks up to 10,000 litres capacity. Component size capability: up to 500mm diameter × 3000mm length using our fluidized bed furnaces.
Oil Quench
10,000 L Tank
Polymer Quench
6,000 L Tank
Maximum achievable hardness for the material
Large capacity — handles up to 2-ton batches
Oil & polymer quenching for distortion control
Pit-type FBD for long shafts (3m length)
Service 05
Tempering is performed after hardening or carburizing to reduce brittleness and relieve internal stresses. The component is reheated to a temperature below the critical point and held for a specific time, then cooled.
This process trades some hardness for improved toughness and ductility, achieving the optimal balance of mechanical properties for the application.
Retains high hardness, relieves quenching stresses
Balanced hardness and toughness
Maximum toughness, lower hardness (through-hardened parts)
Reduces brittleness of as-quenched martensite
Relieves residual stresses from quenching
Improves impact strength and ductility
Stabilizes dimensions for precision components
Always performed post-hardening or post-carburizing
Service 06
Liquid Nitriding (also known as salt bath nitriding) is a process where components are immersed in a molten cyanide-free salt bath at temperatures of 570–630°C. Nitrogen is diffused into the surface from the molten salt medium.
Ferronite operates 2 liquid nitriding furnaces with capacities of 450 KG and 300 KG respectively, plus an Oxinite bath (300 KG) for specialized applications.
Liquid Nitriding Furnace — 450 KG
Liquid Nitriding Furnace — 300 KG
Oxinite Bath — 300 KG
Faster cycle times compared to gas nitriding
Uniform case depth even on complex geometries
Improved fatigue strength and surface hardness
Cyanide-free salt baths for safer operation
Service 07
Oxidation is performed as a post-nitriding or post-FNC treatment. Components are heated in a steam or oxygen-containing atmosphere at 500–570°C to form a thin iron oxide (Fe₃O₄ — magnetite) layer on the surface.
This black oxide layer significantly enhances corrosion resistance — often replacing expensive plating or coating operations. It also improves the aesthetic appearance with a uniform black finish.
Dramatically improves corrosion resistance
Uniform black aesthetic finish
Cost-effective alternative to plating
No dimensional change
Typically combined with nitriding/FNC
Service 08
Austempering is a specialized heat treatment where steel is heated above its critical temperature, then quenched in a hot salt bath (typically 250–400°C) and held until the transformation to bainite is complete.
The result is a unique bainitic microstructure that offers an exceptional combination of hardness, toughness, and wear resistance — superior to conventional quench-and-temper for certain applications.
| Property | Austempering | Q&T |
|---|---|---|
| Toughness | Higher | Moderate |
| Distortion | Lower | Higher |
| Crack Sensitivity | Lower | Higher |
| Wear Resistance | Good | Higher |
Superior toughness-to-hardness ratio
Reduced distortion and cracking risk
Bainitic microstructure for fatigue resistance
No need for separate tempering step
Service 09
Our high-heat thermal deburring solves the problem of deburring parts with recessed or impossible-to-reach areas, in addition to burning off burrs on external surfaces.
The deburring happens in a brief burst of heat, reaching temperatures of 5430°F (3000°C) for about 20 milliseconds. That's enough time for deburring without affecting part dimensions or metallurgy.
Parts loaded into sealed chamber with combustible gas mixture
Gas ignited — combustion wave propagates at 3000°C
Burrs ignite instantly due to high surface-area-to-mass ratio
20ms later — gas evacuated, parts cooled and unloaded
Less costly than hand deburring
Fast and efficient for small and large burrs
Does not alter part surface finish
Geometry thread forms not affected
Higher level of consistency over manual deburring
Eliminates burrs in inaccessible internal areas
Service 10
Rilsan PA11 is a high-performance polyamide coating applied to metal surfaces through a fluidized bed or electrostatic spray process. The coating is then fused at high temperature to form a durable, bonded layer.
Derived from renewable castor oil sources, PA11 coating provides excellent anti-friction properties, chemical resistance, and corrosion protection — making it ideal for components that require low friction and long service life.
Surface preparation — blasting & cleaning
Pre-heating of components
PA11 powder application (fluidized bed / spray)
Fusing at 200–230°C to form bonded coating
Cooling, inspection & QC
Excellent anti-friction / low coefficient of friction
Superior chemical & solvent resistance
Outstanding corrosion and salt-spray resistance
Impact and abrasion resistant
Lightweight — adds minimal thickness (30–80μm)
Derived from renewable castor oil — eco-friendly