Home > Welded Pipes > Nickel Alloy Welded Pipes
Inox Steel India is a globally recognized manufacturer and exporter of Nickel Alloy Welded Pipes in grades Inconel 625, Monel 400, Hastelloy C22, and Incoloy 825, produced as per ASTM B619/B626 specifications.
These high-performance alloys are engineered for extremely demanding environments involving high temperature, severe corrosion, seawater exposure, acidic chemicals, and aggressive industrial media.
Using advanced welding processes such as GTAW (TIG) root welding, SAW / GMAW multi-pass welding, and strict heat treatment and NDT testing, our pipes deliver reliable performance in offshore, petrochemical, pollution control, chemical processing, nuclear, and marine industries.
Inox Steel India is known for its specialization in nickel-based corrosion-resistant alloys, offering premium welded pipes that meet critical global project standards with full traceability, PMI testing, and TPI-approved inspections (SGS, BV, DNV, TÜV, Lloyd’s).
Nickel Alloy Welded Pipes are manufactured using high-nickel alloys that exhibit:
These welded pipes are produced using plate or coil welded through GTAW and SAW methods, followed by heat treatment and pickling.
Standards ASTM B619 and B626 ensure the weld seam properties match the base metal through stringent testing and material requirements.
Nickel Alloy Welded Pipes are widely used when stainless steel or duplex grades cannot withstand the chemical severity or temperature demands of the application.
Types of Nickel Alloy Welded Pipes We Manufacture
1️⃣ Raw Material Inspection (Plates/Coils)
Each batch undergoes PMI (Positive Material Identification) to ensure precise Ni-Cr-Mo composition.
2️⃣ Edge Preparation
Plates are beveled for high-quality weld penetration.
3️⃣ Forming / Rolling
Nickel alloy plates are rolled into cylindrical form with precise tolerances.
4️⃣ Root Pass Welding – GTAW (TIG)
Ensures clean fusion, defect-free weld root, and metallurgical consistency.
5️⃣ Multi-Pass Filling – SAW / GMAW
Successive weld layers ensure strength equivalent to base metal.
6️⃣ Heat Treatment
Annealing or solution annealing relieves stresses and restores corrosion resistance.
7️⃣ Pickling & Passivation
Restores passive oxide layer and removes welding scale.
8️⃣ Non-Destructive Testing (NDT)
RT, UT, Penetrant Testing, and weld inspection per ASTM B619/B626.
9️⃣ Hydrostatic Testing
Ensures leakproof and pressure-resistant performance.
🔟 Final Dimensional Inspection & Marking
Marking includes heat number, grade, OD/WT, ASTM standard & lot traceability.
Chemical Processing & Petrochemical Plants
Hastelloy C22 & Incoloy 825 used in reactors, mixers, heat exchangers & high-acid systems.
Offshore & Marine Engineering
Monel 400 & Inconel 625 used in seawater intake, risers, desalination lines & subsea infrastructure.
Oil & Gas Refining
Corrosion-resistant alloy pipes for sour service, high-temperature lines & aggressive environments.
Pollution Control Equipment
Hastelloy alloys used in scrubbers, flue gas systems & stack liners.
Aerospace & Defense
Inconel 625 for high-stress, high-temperature engine applications.
Nuclear & Power Generation
Nickel alloys are used in critical safety & heat transfer systems.
Nickel Alloy Welded Pipes are engineered for the most extreme operating environments involving high temperature, severe corrosion, acidic chemicals, chlorides, seawater, and oxidizing conditions.
Manufactured under ASTM B619 and B626, these pipes are welded using GTAW + SAW multi-pass processes and subjected to solution annealing and pickling to achieve uniform corrosion resistance and metallurgical stability.
Inox Steel India specializes in corrosion-resistant alloy (CRA) welded pipes for offshore, petrochemical, pollution control, heat exchangers, and nuclear applications — where stainless steel or duplex grades are inadequate.
Our pipes comply with strict dimensional tolerance, pressure testing, weld integrity, and TPI approvals (SGS, BV, DNV, TÜV, Lloyd’s).
| Parameter / Property | Inconel 625 (UNS N06625) | Monel 400 (UNS N04400) | Hastelloy C22 (UNS N06022) | Incoloy 825 (UNS N08825) |
|---|---|---|---|---|
| Manufacturing Standard | ASTM B619 / B626 | ASTM B619 / B626 | ASTM B619 / B626 | ASTM B619 / B626 |
| Material Type | Ni-Cr-Mo Alloy (High Strength) | Ni-Cu Alloy (Seawater Service) | Ni-Cr-Mo-W Alloy (Corrosion Resistant) | Ni-Fe-Cr-Mo Alloy |
| Key Features | High strength, oxidation + chloride resistance | Excellent seawater & brine resistance | Outstanding corrosion & acid resistance | High temperature & acid resistance |
| Corrosion Resistance | Excellent (pitting, crevice, chloride) | Excellent (saltwater & alkaline media) | Exceptional (HCl, H2SO4, HF) | Excellent (reducing + oxidizing acids) |
| Temperature Resistance | Up to 1000°C | Up to 540°C | Up to 800°C | Up to 540°C |
| Common Applications | Offshore, chemical, heat exchangers | Marine piping, desalination | Chemical reactors, pollution control | Fertilizer, oil & gas, acid handling |
| Weld Type | GTAW + SAW / EFW | GTAW + SAW / EFW | GTAW + SAW / EFW | GTAW + SAW / EFW |
| Heat Treatment | Solution Annealed | Annealed | Solution Annealed | Stabilized Annealed |
| Mechanical Strength | TS: 760–1030 MPa | TS: 517+ MPa | TS: 690–760 MPa | TS: 550–690 MPa |
| Yield Strength | 414–690 MPa | 170–240 MPa | 310+ MPa | 220–300 MPa |
| Density | 8.44 g/cm³ | 8.8 g/cm³ | 8.69 g/cm³ | 8.14 g/cm³ |
| NDT Requirements | UT, RT, PMI, Cleanliness Test | UT, RT, PMI | UT, RT, PMI | UT, RT, PMI |
| Corrosion Test | ASTM G48 / ASTM B117 | ASTM G31 | ASTM G28 / G48 | ASTM G48 |
| OD Range | ½” – 24″ | ½” – 24″ | ½” – 24″ | ½” – 24″ |
| Wall Thickness | SCH 10 – SCH 80 / custom | SCH 10 – SCH 80 / custom | SCH 10 – SCH 80 / custom | SCH 10 – SCH 80 / custom |
| Length Available | 6m / 12m | 6m / 12m | 6m / 12m | 6m / 12m |
| End Finish | Bevelled / Plain | Bevelled / Plain | Bevelled / Plain | Bevelled / Plain |
| Surface Finish | Annealed & Pickled | Annealed | Annealed & Pickled | Annealed |
| Testing Documentation | MTC 3.1 / PMI / NDT | MTC 3.1 / PMI / NDT | MTC 3.1 / PMI / NDT | MTC 3.1 / PMI / NDT |
| Typical Use-Industries | Oil & Gas, Petrochemicals, Marine, Aerospace | Marine, Chemical, Offshore | Pharmaceuticals, Chemical Processing | Oil & Gas, Fertilizers, Nuclear |
| HSN Code | 7507.20 | 7507.20 | 7507.20 | 7507.20 |
Inconel 625 (UNS N06625)
Monel 400 (UNS N04400)
Hastelloy C22 (UNS N06022)
Incoloy 825 (UNS N08825)
Applicable Standards
✔ For high temperature + high strength applications
Use Inconel 625
(Up to 1000°C, oxidation-resistant)
✔ For seawater & marine conditions
Use Monel 400
(Outstanding seawater corrosion resistance)
✔ For extreme acid & chemical corrosion
Use Hastelloy C22
(Best-in-class chemical corrosion resistance)
✔ For mixed-service chemical + oil & gas environments
Use Incoloy 825
(Excellent resistance to reducing & oxidizing acids)
| Application | Recommended Alloy | Reason |
|---|---|---|
| Chemical reactors | Hastelloy C22 | Extreme acid resistance |
| Offshore risers & subsea lines | Inconel 625 | High strength + seawater resistance |
| Desalination & marine pipelines | Monel 400 | Best in seawater corrosion |
| Heat exchangers | Incoloy 825 / Inconel 625 | Thermal + corrosion stability |
| Pollution control (FGD systems) | Hastelloy C22 | Superior corrosion resistance |
| Oil & gas (sour service) | Inconel 625 / Incoloy 825 | SCC resistance |
| High-temperature lines | Inconel 625 | Oxidation & thermal stability |
| Parameter | Capability |
|---|---|
| Outside Diameter (OD) | ½” – 24″ |
| Wall Thickness | SCH 10 – SCH 80 / Custom |
| Length | 6 m / 12 m |
| Weld Type | GTAW root + SAW multi-pass |
| Heat Treatment | Annealed / Solution Annealed |
| Ends | Bevelled / Plain |
| Surface Finish | Annealed & Pickled |
| Nickel Alloy Grade | Price (INR/kg) | Price (USD/kg) |
|---|---|---|
| Monel 400 | ₹ 2,000 – ₹ 3,500 | $ 24 – $ 40 |
| Inconel 625 | ₹ 3,500 – ₹ 5,500 | $ 42 – $ 70 |
| Hastelloy C22 | ₹ 4,200 – ₹ 6,800 | $ 50 – $ 80 |
| Incoloy 825 | ₹ 2,200 – ₹ 3,800 | $ 26 – $ 45 |
| Welded CRA Pipe with NDT | ₹ 300 – ₹ 500 extra | $ 4 – $ 7 extra |
| Polished / Annealed Finish | ₹ 100 – ₹ 250 extra | $ 1.5 – $ 3 extra |
Prices vary by OD, thickness, heat treatment, corrosion test requirements & TPI.
7507.20 — Nickel Alloy Welded Pipes
✔ Non-Destructive Testing (NDT)
✔ Corrosion Testing
✔ Mechanical Tests
✔ Hydrostatic Testing
Mandatory for pressure integrity.
✔ PMI (Positive Material Identification)
Ensures exact nickel alloy grade & chemistry.
✔ Documentation
✔ Third Party Inspection
SGS, TUV, BV, DNV, Lloyd’s registered inspectors.
Our Nickel Alloy Welded Pipes are supplied to:
Middle East:
Africa:
Europe:
Americas:
Asia Pacific:
Used in offshore, petrochemical, desalination, chemical processing & nuclear industries.
Nickel Alloy Welded Pipes require precise welding techniques, controlled heat treatment, and strict corrosion testing to perform in aggressive industrial environments.
Inox Steel India is one of the few manufacturers with complete in-house capability for GTAW root + SAW multi-pass welding, solution annealing, PMI verification, RT/UT testing, and TPI inspection.
Our expertise with corrosion-resistant alloys (CRA) makes us a trusted partner for global EPC contractors, refineries, offshore platforms, desalination plants, and chemical industries.
Clients rely on us because:
Our pipes are engineered for service environments where failure is unacceptable.
Offshore Oil & Gas Platforms
Inconel 625 & Monel 400 used in subsea lines, risers, wellhead piping, and seawater systems.
Chemical & Petrochemical Processing
Hastelloy C22 & Incoloy 825 used in reactors, scrubbers, mixers, high-acid flows & corrosive processing units.
Marine & Desalination Plants
Monel 400 & Inconel 625 used in seawater intake, brine discharge, condensers & evaporators.
Pollution Control Equipment (FGD Systems)
Hastelloy C22 welded pipes provide unmatched resistance to acidic flue gases & contaminants.
Nuclear & High-Temperature Services
Nickel alloys used in heat transfer systems, nuclear safety components & high-stress applications.
Heat Exchangers & Condensers
Inconel 625 & Incoloy 825 are ideal due to high thermal stability & corrosion resistance.
Nickel Alloy Welded Pipes require careful packaging due to their high value and sensitivity.
✔ Standard Export Packaging Includes:
✔ For Acid / Chemical Resistant Alloys:
✔ Ports of Dispatch:
JNPT, Mundra, Hazira, Chennai
✔ Export Destinations:
USA, Middle East, Europe, Southeast Asia, Africa
Looking for Inconel, Monel, Hastelloy, or Incoloy Welded Pipes that deliver guaranteed corrosion and temperature performance?
52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004
alloy@inoxsteelindia.in
+91 9930796690
Inox Steel India
Email
Phone
Yes — 100% PMI is performed to ensure correct nickel alloy chemistry.
GTAW (TIG) root + SAW / GMAW multi-pass welding.
Yes — Inconel, Hastelloy & Incoloy pipes undergo solution annealing.
Yes — RT films, UT reports, DP tests, weld maps & MTC EN 10204 3.1/3.2.
Yes — supplied to more than 45+ countries with full export packing.
Our technical team provides complete support with material selection, NDT reports, heat treatment charts & global delivery.