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INOX STEEL INDIA is one of India’s leading suppliers of High-Nickel Alloy Welded Tubes, engineered for extreme environments where stainless steels fail. These tubes deliver maximum corrosion resistance, exceptional high-temperature stability, high strength-to-weight ratio, and long-term durability in aggressive chemical, marine, and high-pressure systems.
We manufacture and supply welded tubes in Inconel 625, Monel 400, Hastelloy C22, Incoloy 825, meeting stringent international standards ASTM B515, B516, B626. Our tubes are used across chemical plants, offshore platforms, refineries, desalination plants, fertiliser units, pollution-control systems, and nuclear power stations.
Nickel Alloy Welded Tubes are made from high-nickel alloy plates/strips that are TIG/Laser/Plasma welded, followed by solution annealing to restore corrosion resistance and mechanical integrity.
These alloys offer:
1. Inconel 625 Welded Tubes (Ni-Cr-Mo-Nb Alloy)Best for: Seawater corrosion, Chemical processing, High-temperature oxidation, Sour gas service.
2. Monel 400 Welded Tubes (Ni-Cu Alloy)Best for: Marine & offshore, Heat exchangers in seawater, Brine systems, Non-oxidising acids.
3. Hastelloy C22 Welded Tubes (Ni-Cr-Mo-W Alloy)Best for: Harsh chemical plants, Mixed acid environments, Pollution-control equipment, High-chloride systems.
4. Incoloy 825 Welded Tubes (Ni-Fe-Cr-Mo-Cu Alloy)Best for: Sulphuric & phosphoric acids, Sour gas & oilfield service, Heat exchangers, Pickling plant systems.
Product: Nickel Alloy Welded Tubes
Grades: Inconel 625 • Monel 400 • Hastelloy C22 • Incoloy 825
Standards: ASTM B515 • ASTM B516 • ASTM B626
Brand: INOX STEEL INDIA
| Section | Parameter | Technical Specification |
|---|---|---|
| General | Product | Nickel Alloy Welded Tubes / High-Nickel Welded Tubing |
| Alternate Names | Inconel Welded Tubes • Monel Welded Tubes • Hastelloy Welded Tubes • Incoloy Welded Tubes • High-Nickel Welded Pipes | |
| Manufacturing Method | Formed from cold-rolled strip/plate and welded by TIG / Plasma / Laser / GTAW, followed by full solution annealing & pickling | |
| Application Category | Corrosion-resistant, high-temperature & high-pressure tubing for chemical, petrochemical, offshore, power & pollution-control systems | |
| Material Grades | Inconel 625 | Ni-Cr-Mo-Nb alloy, excellent pitting & crevice corrosion resistance, high strength at elevated temperatures |
| Monel 400 | Ni-Cu alloy, outstanding resistance to seawater & non-oxidising acids | |
| Hastelloy C22 | Ni-Cr-Mo-W alloy, top-tier resistance to a wide range of aggressive chemicals & mixed acids | |
| Incoloy 825 | Ni-Fe-Cr-Mo-Cu alloy, excellent resistance to sulphuric & phosphoric acids, stress corrosion cracking | |
| Standards | Inconel / Incoloy Welded | ASTM B515 / ASTM B516 |
| Hastelloy Welded | ASTM B626 | |
| General Nickel Alloy Tubes | ASTM B704 / B751 (where applicable, project-specific) | |
| Dimensional Range | Outside Diameter (OD) | 6 mm – 168 mm (1/4″ – 6″ typical; larger ODs on request) |
| Wall Thickness (WT) | 0.7 mm – 8.0 mm (higher WT on request) | |
| Length | Up to 6m standard, 6–12m on request, cut lengths for instrumentation | |
| Shapes | Round (standard), Limited square/rectangular on request | |
| Mechanical Properties (Typical, Room Temp) | Inconel 625 | YS ≥ 414 MPa • TS ≥ 827 MPa • Elongation ≥ 30% |
| Monel 400 | YS ≥ 240 MPa • TS ≥ 550 MPa • Elongation ≥ 30% | |
| Hastelloy C22 | YS ≥ 283 MPa • TS ≥ 690 MPa • Elongation ≥ 40% | |
| Incoloy 825 | YS ≥ 240 MPa • TS ≥ 550 MPa • Elongation ≥ 30% | |
| Chemical Composition (Typical) | Inconel 625 | Ni balance, Cr ~20–23%, Mo ~8–10%, Nb+Ta ~3.15–4.15%, Fe ≤5% |
| Monel 400 | Ni ~63% min, Cu 28–34%, Fe ≤2.5%, Mn ≤2% | |
| Hastelloy C22 | Ni balance, Cr ~20–22.5%, Mo ~12.5–14.5%, Fe ~2–6%, W ~2.5–3.5% | |
| Incoloy 825 | Ni 38–46%, Cr 19.5–23.5%, Fe balance, Mo 2.5–3.5%, Cu 1.5–3% | |
| Welding Characteristics | Weld Processes | TIG / Plasma / Laser welding; autogenous or with matching filler |
| Filler Wires | Inconel 625 → ERNiCrMo-3; Monel 400 → ERNiCu-7; Hastelloy C22 → ERNiCrMo-10; Incoloy 825 → ERNiFeCr-1 or equivalent | |
| Post-Weld Treatment | Full solution annealing + rapid quenching + pickling/passivation to restore corrosion resistance | |
| Corrosion / Temperature Resistance | Seawater & Brines | Monel 400, Inconel 625 |
| Strong Acids / Mixed Media | Hastelloy C22, Incoloy 825 | |
| High Temp (600–1000°C range) | Inconel 625 (especially for oxidation/sulfidation) | |
| Applications | Chemical Processing | Heat exchangers, reboilers, process coils, transfer lines |
| Petrochemical & Refineries | Air coolers, furnace tubes (non-oxidising), sour service | |
| Marine & Offshore | Seawater cooling, risers, splash zone piping (Monel 400 / Inconel 625) | |
| Pollution Control | Flue-gas desulphurisation, scrubber tubes (C22 / 825) | |
| Power & Nuclear | Critical heat exchanger tubes, feedwater heaters | |
| Instrumentation | Small OD tubing for corrosive media | |
| Testing & QA | Mandatory Tests | Hydrostatic or eddy-current test, visual & dimensional check |
| NDT | Eddy Current, UT, RT (as specified), DPI | |
| Special Tests | PMI, Intergranular Corrosion (IGC), Ferrite check (where needed), Corrosion testing per ASTM G standards | |
| Surface Finish | Internal / External | Bright annealed • Pickled • Light polished (for process plants) |
| End Conditions | End Type | Plain ends (PE), deburred; bevelled ends on request |
| HSN Code | Nickel Alloy Tubes | 7507.12.00 – Pipes & tubes of nickel alloys (indicative, for content/SEO) |
| Property | Welded Nickel Alloy Tubes | Seamless Nickel Alloy Tubes |
|---|---|---|
| Cost | Lower | High |
| Availability | Shorter lead time | Longer lead time |
| Weld Seam Strength | Excellent (TIG/Plasma) | No seam |
| Use Cases | Heat exchangers, condensers | High-pressure systems |
Welded tubes are preferred in chemical process, marine, desalination, heat exchangers, while seamless is chosen for very high-pressure applications.
ASTM Compliant:
Produced as per ASTM B515/B516/B626. Each weld is validated to international standards.
Solution Annealed:
Full solution annealing ensures maximum corrosion & mechanical performance.
Ultra-Clean Welds:
TIG/Laser welding ensures zero contamination, high integrity, and smooth internal bore.
Chemical Ready:
Tested for aggressive mixed-acid, chloride, and seawater environments.
Custom Range:
From 6 mm OD for instrumentation to 168 mm OD for process plants.
Certified Quality:
Supplied worldwide with complete 3.1 certification and export packaging.
Chemical Processing
Marine & Offshore
Petrochemical & Oil & Gas
Pollution Control (FGD Systems)
Power & Nuclear
Strong demand from:
INOX STEEL INDIA supplies worldwide with strict quality control.
| OD (mm) | Wall Thickness (mm) | Typical Application |
|---|---|---|
| 6 – 12.7 mm | 0.7 – 1.2 | Instrumentation, analyzer lines |
| 12.7 – 25.4 mm | 0.9 – 2.0 | Chemical process tubing |
| 25.4 – 50.8 mm | 1.0 – 3.0 | Heat exchangers, corrosion-resistant piping |
| 50.8 – 114 mm | 1.5 – 6.0 | Condensers, heaters, evaporators |
| 114 – 168 mm | 2.0 – 8.0 | Toxic media transfer, seawater equipment |
(Custom OD/WT available on request for refinery/petrochemical projects.)
| Alloy | Max Cont. Service Temp | Notes |
|---|---|---|
| Inconel 625 | ~980°C | Superb oxidation & creep resistance |
| Monel 400 | ~550°C | Best for seawater & non-oxidising acids |
| Hastelloy C22 | ~600°C | Excellent resistance in mixed acid systems |
| Incoloy 825 | ~540°C | Good stability in sulphuric/phosphoric acids |
| Environment | Inconel 625 | Monel 400 | Hastelloy C22 | Incoloy 825 |
|---|---|---|---|---|
| Seawater | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐ |
| Chlorides | ⭐⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ |
| Reducing Acids | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ |
| Mixed Acids | ⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ |
| High Temp Oxidation | ⭐⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐ |
| Stress Corrosion Cracking | ⭐⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ |
Welding Processes Used in Production: TIG / GTAW, Plasma welding, Laser beam welding. Autogenous TIG for thin walls; GTAW with filler for bigger WT.
Recommended Filler Wires (Buyer-Facing Table):
| Alloy Grade | Filler Wire | AWS/EN Classification |
|---|---|---|
| Inconel 625 | ERNiCrMo-3 | For corrosion & temperature service |
| Monel 400 | ERNiCu-7 | Perfect for seawater applications |
| Hastelloy C22 | ERNiCrMo-10 | Best for chemical plants |
| Incoloy 825 | ERNiFeCr-1 | Balanced corrosion resistance |
Post Weld Heat Treatment:
Nickel alloys are usually solution annealed after welding to: Restore corrosion resistance, Stress-relief, Remove carbide precipitation, Improve ductility.
| Finish | Application |
|---|---|
| Bright Annealed (BA) | Heat exchangers, marine coolers |
| Pickled & Passivated | Chemical & petrochemical |
| Light Polished | Instrumentation & analyzer lines |
| Cleaned & Degreased | Oil & gas, nuclear applications |
| Service Condition | Recommended Alloys | Reason |
|---|---|---|
| Seawater, brine, offshore | Monel 400, Inconel 625 | Chloride resistance |
| Mixed acid chemicals | Hastelloy C22 | Handles oxidizing + reducing media |
| High-temperature oxidation | Inconel 625 | Stable at 900–980°C |
| Sour gas / H2S | Incoloy 825 | Stress corrosion cracking resistance |
| Fertilizer & pickling plants | Incoloy 825 / C22 | Acid resistance |
| Nuclear & aerospace | Inconel 625 | High strength & thermal stability |
| Alloy Grade | Type | Price (INR/Kg) | Price (USD/Kg) |
|---|---|---|---|
| Inconel 625 Welded Tubes | Welded/Annealed | ₹ 3,800 – ₹ 5,800 | $46 – $71 |
| Monel 400 Welded Tubes | Welded/Annealed | ₹ 2,400 – ₹ 3,600 | $29 – $44 |
| Hastelloy C22 Welded Tubes | Welded/Annealed | ₹ 4,800 – ₹ 6,800 | $58 – $84 |
| Incoloy 825 Welded Tubes | Welded/Annealed | ₹ 2,600 – ₹ 4,200 | $31 – $51 |
Prices vary based on OD, thickness, welding method, heat treatment & test level.
Mandatory Tests:
NDT Tests:
Advanced Tests:
Documentation Provided:
EN 10204 Type 3.1 / 3.2, Solution annealing charts, Weld maps, PMI test charts, Mechanical & chemical reports.
High-Nickel alloys are not ordinary tubing materials — they demand expertise in metallurgy, welding, heat treatment, and corrosion engineering. INOX STEEL INDIA is trusted globally because:
Searches like:
lead buyers to INOX STEEL INDIA because:
We maintain stock in key industrial hubs
Mumbai • Ahmedabad • Surat • Vadodara • Pune • Hyderabad • Chennai • Delhi NCR • Bengaluru
Export shipments handled with full compliance
We supply to chemical, offshore, energy & defence clients worldwide.
| Industry | Why Nickel Alloys Are Needed | Suitable Grades |
|---|---|---|
| Chemical & Petrochemical | Mixed acids, chlorides, solvents | C22, 625, 825 |
| Marine & Offshore | Seawater, brine, stress cracking | Monel 400, 625 |
| Oil & Gas (Sour Service) | H2S, CO2, high pressure | Incoloy 825, 625 |
| Power & Nuclear | High temperature, oxidation | Inconel 625 |
| Desalination Plants | Chloride-rich water | 625, 400 |
| Pollution Control (FGD) | Hot acidic environment | C22 |
| Aerospace & Defence | High strength-to-weight ratio | Inconel 625 |
STANDARD PACKAGING:
Welded tubes wrapped in anti-corrosion paper, packed in HDPE/LDPE cover, tube ends capped, laser-marked / hard-stamped with grade & heat numbers.
EXPORT PACKAGING:
High-strength wooden crates, VCI foil wrapping, individual sleeving for polished tubes, palletised for container shipping.
DOCUMENTATION:
EN 10204 3.1 / 3.2, PMI test report, Weld map, Solution annealing charts, NDT reports (EC, RT, UT, PT), Chemical + mechanical certificates.
For Inconel 625, Monel 400, Hastelloy C22, Incoloy 825 Welded Tubes
52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004
alloy@inoxsteelindia.in
+91 9930796690
Inconel 625, Monel 400, Hastelloy C22, Incoloy 825. From 6 mm OD to 168 mm OD, with wall thickness from 0.7–8 mm. Yes — every tube is solution annealed to restore corrosion and mechanical properties. ASTM B515 / B516 / B626, depending on the alloy. Yes — we supply both welded and seamless 625 for heat exchangers, condensers & reactors. Which nickel alloys do you supply?
What is the size range you offer?
Are welded nickel tubes solution annealed?
What standards do your welded tubes comply with?
Do you supply Inconel 625 tubing for heat exchangers?
What is the difference between Inconel 625 and Hastelloy C22?
Manufacturer of Nickel Alloy Welded Tubes in Inconel 625, Monel 400, Hastelloy C22, Incoloy 825. TIG/Laser welded, solution annealed and tested per ASTM B515/B516/B626. Used in chemical plants, offshore, desalination, refineries & heat exchangers. Exporter to USA, Europe & Middle East.