Gas Nitriding Services in Pune & Mumbai — Professional Surface Hardening by SR Thermal Solution
SR Thermal Solution provides professional gas nitriding services in Pune and Mumbai for manufacturers who demand precision surface hardening without dimensional distortion. Our advanced gas nitriding facility in Chikhali, Pune processes thousands of components every month for the automotive, tooling, hydraulic, aerospace, and heavy engineering industries across Western India.
Gas nitriding services involve the thermochemical surface hardening of steel components using nitrogen diffusion at controlled temperatures. As a specialist in gas nitriding heat treatment services, we create an extremely hard, wear-resistant surface layer while maintaining the tough, ductile core of the component. Unlike carburizing or induction hardening, gas nitriding produces zero distortion — making it the ideal surface hardening solution for precision-machined, finished components.
If you are a manufacturer in Pune, Mumbai, Thane, Navi Mumbai, or anywhere in Maharashtra looking for reliable gas nitriding services near me, SR Thermal Solution is your trusted partner. We combine 19+ years of heat treatment expertise with our own furnace manufacturing capability — a combination no other provider of nitriding services in Maharashtra can offer.
Get started today — call +91 8378848736 or visit our contact page.
What Are Gas Nitriding Services?
Gas nitriding services are professional heat treatment services that use the gas nitriding process to improve the surface properties of steel components. The service provider operates specialised furnace equipment, maintains controlled process atmospheres, monitors quality parameters, and delivers treated components with documented test results.
At SR Thermal Solution, our gas nitriding services include analysis of your component material and specifications, processing in our horizontal gas nitriding furnace under precisely controlled conditions, comprehensive quality testing including hardness and case depth measurement, and delivery with complete documentation.
Gas nitriding services differ from other heat treatment services in several important ways. The process operates at relatively low temperatures of 495 to 565°C, well below the critical transformation temperature of steel. No quenching is required, meaning zero dimensional change. The resulting surface can achieve hardness levels of 700 to 1100 HV.
Types of Gas Nitriding Services We Offer
Standard Gas Nitriding Services
Standard gas nitriding is our core service. It creates a deep diffusion zone of 0.1 to 0.8 mm with surface hardness up to 1100 HV. The process uses ammonia gas at 495 to 565°C over cycles of 15 to 100+ hours. It is best suited for crankshafts, camshafts, gears, injection moulds, die casting dies, forging dies, extrusion dies, machine spindles, and ball screws. This is our most commonly requested service from Pune and Mumbai clients.
FNC — Ferritic Nitro Carburizing Services
FNC introduces both nitrogen and carbon into the surface at approximately 570°C. The result is a compound layer with superior corrosion resistance. FNC is increasingly used as an environmentally friendly replacement for hard chrome plating. As a trusted name for FNC job work in Pune, we treat brake rotors, cylinder liners, hydraulic valve bodies, fasteners, and bearing components. It is particularly popular with our automotive clients in Pune and Mumbai.
ONC — Oxy Nitro Carburizing Services
ONC extends the FNC process with a controlled oxidation step, creating a dense black oxide surface layer. This gives components both corrosion protection and an attractive black finish — eliminating the need for separate painting or black oxide treatment. It is commonly requested for hand tools, machine tool parts, automotive fasteners, and hydraulic components.
The Science Behind Gas Nitriding Services
Nitrogen Diffusion Mechanism
During gas nitriding, ammonia gas is introduced into the sealed furnace chamber at process temperature. When ammonia contacts the hot steel surface, it dissociates into atomic nitrogen and hydrogen. The nitrogen atoms diffuse into the steel lattice through interstitial diffusion. As nitrogen accumulates, it reacts with iron and alloying elements to form hard nitride compounds — iron nitrides (Fe2N, Fe3N, Fe4N) and alloy nitrides such as chromium nitride (CrN), molybdenum nitride (Mo2N), and vanadium nitride (VN).
Two-Zone Structure
Gas nitriding creates a two-zone structure. The compound layer (white layer) is the outermost zone, typically 5 to 25 microns thick, consisting of iron nitrides that provide excellent wear and corrosion resistance. The diffusion zone extends beneath to 0.1 to 0.8 mm depth, containing finely dispersed alloy nitride precipitates that improve fatigue strength. Hardness gradually decreases from the surface inward, creating a smooth transition to the tough core.
Why Our Process Control Delivers Consistent Results
At SR Thermal Solution, we achieve consistent results because we control every variable. Temperature is maintained within ±1°C using PID controllers. Ammonia flow rate is controlled using precision mass flow controllers. Dissociation rate is monitored continuously. This level of control is possible because we manufacture our own furnaces — we understand every sensor, controller, and gas flow path in the system.
Industries We Serve with Gas Nitriding Services in Pune & Mumbai
Automotive Industry — Pune
Pune is India’s automotive capital. We provide gas nitriding services for crankshafts, camshafts, transmission gears, valve components, piston rings, connecting rods, and cam followers. Our clients include OEM suppliers from Bhosari, Chakan, Talegaon, and Ranjangaon. Specific applications include improving crankshaft fatigue life by up to 50 percent and enhancing wear resistance of gear tooth surfaces.
Tool & Die Industry — Pune & Mumbai
Our gas nitriding services extend tool life by 3 to 5 times, reducing die replacement costs. We process H13 die casting dies, D2 blanking tools, P20 injection moulds, forging dies, aluminium extrusion dies, and precision punches.
Hydraulic Equipment — Mumbai & Pune
Gas nitriding and FNC services are essential for hydraulic cylinder rods, piston rods, valve spools, pump shafts, and hydraulic motor components. Our FNC service is increasingly replacing chrome plating for hydraulic components due to superior performance and environmental compliance.
Defence & Aerospace — Pune
Our gas nitriding services meet stringent quality standards for defence applications, including barrel components, actuator parts, and precision fasteners. Pune hosts significant defence manufacturing capabilities, including ordnance factories and aerospace suppliers.
Heavy Engineering — Mumbai
Mumbai’s Thane-Belapur industrial belt is home to major heavy engineering companies. We provide gas nitriding services in Mumbai for machine tool spindles, ball screws, textile machinery components, pump parts, and mining equipment.
Want to send components on a contract basis? See our detailed guide to gas nitriding job work in Pune & Mumbai, including pricing and turnaround.
Gas Nitriding Services — Quality Assurance
Pre-Treatment Checks
Before any component enters our furnace, we verify the material grade, perform incoming hardness testing, and inspect surfaces for contamination. Components not meeting pre-treatment requirements are flagged before proceeding.
In-Process Monitoring
During the cycle, we continuously monitor furnace temperature across all zones with ±1°C accuracy. Ammonia flow rate is tracked via mass flow controllers. Dissociation rate is checked at regular intervals. All parameters are recorded on a digital data logger.
Post-Treatment Testing
Surface hardness testing (Vickers and Rockwell), case depth measurement using micro-hardness traverse, and visual inspection. Metallographic cross-section analysis is available on request.
Documentation
Every order includes a process chart with temperature and time log, ammonia flow rate record, hardness test results (surface and core), case depth measurement, and a process completion certificate.
Why Our Gas Nitriding Services Stand Out in Pune & Mumbai
We are both furnace manufacturer and service provider. SR Thermal Solution’s furnace manufacturing division builds gas nitriding furnaces, and we use them to deliver our services. This dual capability means unmatched equipment expertise. No other gas nitriding services provider in Pune or Mumbai has this.
Largest capacity in Western India — 1,200 kg horizontal gas nitriding furnace. Central location between Pune and Mumbai. 19+ years of proven experience with thousands of batches processed. ISO 9001:2015 and ZED certified quality system. Explore our nitriding job work services.
Gas Nitriding Services vs Chrome Plating
| Factor | Gas Nitriding / FNC | Hard Chrome Plating |
|---|---|---|
| Environmental | Clean process — no toxic waste | Hexavalent chromium — toxic, regulated |
| Adhesion | Metallurgical bond — cannot peel | Mechanical bond — can peel or flake |
| Uniformity | Perfectly uniform on all surfaces | Uneven on complex shapes |
| Cost | Competitive | Increasingly expensive |
| Future | Growing adoption | Being phased out due to regulations |
Many Pune and Mumbai manufacturers are actively switching from chrome plating to FNC nitrocarburizing due to environmental regulations and superior performance. Learn more about types of heat treatment services in India.
Frequently Asked Questions — Gas Nitriding Services
Gas nitriding services are professional heat treatment services that use ammonia gas to diffuse nitrogen into steel surfaces at 495 to 565°C. This creates a hard, wear-resistant surface layer while maintaining the tough core. SR Thermal Solution provides these services from Pune for manufacturers across Pune and Mumbai.
Crankshafts, gears, injection moulds, die casting dies, forging dies, hydraulic cylinder rods, machine spindles, ball screws, valve components, and precision fasteners — any steel component requiring high surface hardness without distortion.
Surface hardness increases up to 1100 HV. Wear resistance improves 5 to 10 times. Fatigue strength improves by up to 50 percent. Corrosion resistance improves, especially with FNC. All without any dimensional change.
Standard gas nitriding creates a deep diffusion zone with very high hardness for fatigue and wear. FNC creates a thicker compound layer with superior corrosion resistance, ideal for hydraulic components and chrome plating replacement.
Yes. Components are shipped from Mumbai to Pune via the Expressway in 3 to 4 hours. Total turnaround including treatment is typically 5 to 8 working days for Mumbai clients.
ISO 9001:2015 and ZED certification, with documented quality procedures, full process traceability, hardness testing, and quality reports for every batch.
Yes. Our furnace processes up to 1,200 kg per batch. We handle both small prototypes and large production volumes, with no minimum order.
3 to 7 working days for Pune clients. Mumbai clients add 1 to 2 days for transport. Express 24 to 48 hour service is available.
Nitriding provides a metallurgical bond (cannot peel), uniform coverage, zero toxic waste, and competitive cost. Chrome plating uses toxic hexavalent chromium and faces increasing regulation.
Alloy steels with chromium, molybdenum, vanadium, or aluminium: EN41B, 42CrMo4, 31CrMoV9, EN19, EN24, H13, D2, P20, 17-4 PH, 420 SS.
Chikhali, Pune 411062, Maharashtra. PCMC area, 15 min from Bhosari MIDC, 25 min from Chakan, 2.5 hours from Mumbai.
Call +91 8378848736, email srthermal.solution@gmail.com, or WhatsApp +91 8378848736. We respond within 4 hours.
Contact SR Thermal Solution
- Phone: +91 8378848736 / +91 8975966868
- Email: srthermal.solution@gmail.com / srtssales@gmail.com
- WhatsApp: +91 8378848736
- Address: Gat No-1544, Sonawane Wasti Road, Near Vikas Anath Ashram, Chikhali, Pune – 411062, Maharashtra
- Hours: Monday to Saturday, 9:00 AM to 7:00 PM