Home> Welded Tubes > ASTM B515 / B516 / B626
Engineered for extreme corrosion, extreme temperature, and zero-failure environmentsWhen stainless steels and even duplex alloys reach their performance limits, nickel-based alloys take over. ASTM B515 / B516 / B626 welded tubes are specified for applications where materials must withstand:
INOX STEEL INDIA supplies project-grade nickel alloy welded tubes manufactured with strict metallurgical control, weld integrity, and documentation compliance.
These are welded tubes manufactured from nickel-based or nickel–iron–chromium alloys, designed for environments that are too aggressive for carbon steel, stainless steel, or even duplex alloys. They are covered under:
Typical Grades: 600, 625, 601, 718
Best known for:
Common Uses:
Heat exchangers • superheaters • offshore piping • exhaust systems • aerospace components
Typical Grades: 400, K500
Best known for:
Common Uses:
Marine piping • seawater systems • chemical transfer lines • oil & gas components
Typical Grades: C22, C276
Best known for:
Common Uses:
Chemical reactors • acid plants • scrubbers • pollution control systems
Typical Grades: 800, 800H, 800HT, 825
Best known for:
Common Uses:
Furnaces • petrochemical heaters • power plants • heat treatment equipment
| Standard | Covers | Typical Use |
|---|---|---|
| ASTM B515 | General nickel alloy welded tubes & pipes | Chemical, marine, power |
| ASTM B516 | Welded pipe for high-temp & pressure | Boilers, heaters, furnaces |
| ASTM B626 | Welded tubes for Ni–Cr–Mo / Ni–Fe–Cr alloys | Acid plants, offshore, reactors |
Oil & Gas
Chemical & Petrochemical
Power & Aerospace
Marine & Offshore
Aerospace & High-Tech
Nickel Alloy & Incoloy Welded Tubes
Brand: INOX STEEL INDIA
| Section | Parameter | Technical Specification — Nickel Alloy & Incoloy Welded Tubes |
|---|---|---|
| Standards Covered | ASTM B515 | Nickel Alloy & Nickel-Iron-Chromium welded pipes & tubes |
| ASTM B516 | Nickel Alloy welded pipe for high-temperature & pressure service | |
| ASTM B626 | Welded tubes for nickel-chromium-molybdenum & nickel-iron-chromium alloys | |
| Material Families | Nickel Alloys | Inconel®, Monel®, Hastelloy® |
| Incoloy Alloys | Nickel-Iron-Chromium alloys | |
| Common Grades | Inconel | 600, 625, 601, 718 |
| Monel | 400, K500 | |
| Hastelloy | C22, C276 | |
| Incoloy | 800, 800H, 800HT, 825 | |
| Manufacturing Process | Welding | TIG / Plasma / SAW welded |
| Weld Bead | Bead removed / bead rolled | |
| Heat Treatment | Solution annealed / stress relieved | |
| Dimensional Range | Outside Diameter | 6 mm – 610 mm |
| Wall Thickness | 0.8 mm – 12 mm | |
| Length | 6 m / 12 m / cut-to-length | |
| Mechanical Properties (Typical) | Tensile Strength | 550 – 900 MPa (grade dependent) |
| Yield Strength | 240 – 550 MPa | |
| Elongation | ≥ 30% | |
| Corrosion Resistance | Oxidation | Excellent (high-temp service) |
| Chlorides | Excellent (C-series best) | |
| Acids | Outstanding (Hastelloy C-series) | |
| Seawater | Very high (Monel, Inconel 625) | |
| Temperature Capability | Continuous Service | Up to 1000°C (grade dependent) |
| Testing Requirements | Mandatory | Hydro, Eddy Current, Flattening, Flaring |
| Advanced | PMI, UT, RT, IGC, corrosion tests | |
| End Finish | Tube Ends | Plain / Beveled |
| Surface | Pickled, passivated, polished (if required) | |
| Key Advantages | Performance | Extreme corrosion + high-temperature strength |
| Lifecycle | Very long service life in aggressive media | |
| Typical Applications | Oil & Gas | Heat exchangers, sour service |
| Chemical | Acid plants, reactors | |
| Power | Boilers, superheaters | |
| Marine | Seawater systems | |
| Aerospace | High-temp fluid systems | |
| HSN Code | Nickel Alloy Tubes | 75071200 / 75072000 (as applicable) |
| Outside Diameter (OD) | Wall Thickness (WT) | Typical Applications |
|---|---|---|
| 6 – 19.05 mm | 0.8 – 2.0 mm | Instrumentation, chemical dosing, sampling lines |
| 19.05 – 38.1 mm | 1.0 – 3.0 mm | Heat exchanger / condenser tubes |
| 38.1 – 60.3 mm | 1.5 – 5.0 mm | Process piping, high-temp lines |
| 60.3 – 114.3 mm | 2.0 – 8.0 mm | Refinery lines, offshore skids |
| 114.3 – 610 mm | 3.0 – 12.0 mm | Headers, large-dia fabrication, critical pipelines |
Lengths: 6m / 12m / Cut-to-length as per project isometrics
End Finish: Plain • Beveled • Deburred • Cleaned
| Alloy Family | Typical High-Temp Strength | Best For |
|---|---|---|
| Inconel 600/601 | Very high | Oxidation resistance, furnace service |
| Inconel 625 | High | High temp + severe corrosion |
| Incoloy 800/800H/800HT | High | Heat treatment, petrochemical heaters |
| Hastelloy C22/C276 | Medium–High | Chemical process + acids |
| Monel 400/K500 | Medium | Marine + brine (not highest temp) |
Engineering Note: Nickel alloys are chosen because they retain mechanical stability where SS/duplex softens or corrodes aggressively.
| Service Environment | Best Alloy Choice | Why |
|---|---|---|
| Seawater / brine | Monel 400 / Inconel 625 | Excellent seawater corrosion resistance |
| Chlorides + high temp | Inconel 625 | Pitting/crevice resistance + high-temp strength |
| Mixed acids / oxidizing + reducing | Hastelloy C22 | One of the most versatile acid-resistant alloys |
| Reducing acids (HCl / sulfuric areas) | Hastelloy C276 | Excellent resistance in reducing media |
| Carburizing / sulfidation atmospheres | Incoloy 800HT | Strong high-temp oxidation/carburization resistance |
| Hydrofluoric acid | Monel 400 | Highly resistant vs SS |
Welding Processes Supported:
Weld Quality Requirements (Critical for B515/B516/B626)
Typical filler references (industry practice):
Heat Treatment (when required)
INOX supplies as per project WPS/PQR requirements.
Mandatory Tests
Advanced / Project Tests
Certificates: EN 10204 3.1 / 3.2 + third-party inspection if required.
| Requirement | Recommended Alloy | Reason |
|---|---|---|
| Marine / seawater lines | Monel 400 | Seawater and brine performance |
| High corrosion + high temp | Inconel 625 | Strong + corrosion resistant |
| Mixed acids (oxidizing + reducing) | Hastelloy C22 | Broadest acid resistance |
| Reducing acids / harsh chemicals | Hastelloy C276 | Excellent reducing environment resistance |
| Furnace / petrochemical heaters | Incoloy 800HT | High-temp oxidation & carburization resistance |
| Alloy Family | Indicative Price (INR/Kg) | Indicative Price (USD/Kg) |
|---|---|---|
| Monel 400 | ₹ 1,200 – ₹ 2,100 | $15 – $26 |
| Inconel 625 | ₹ 2,200 – ₹ 3,800 | $27 – $46 |
| Hastelloy C276 / C22 | ₹ 2,800 – ₹ 4,500 | $34 – $55 |
| Incoloy 825 / 800HT | ₹ 1,600 – ₹ 2,800 | $20 – $34 |
(Indicative only; inquiry-based for accuracy.)
| Condition | Recommended Use |
|---|---|
| Pickled & Passivated | Chemical & offshore corrosion service |
| Bright Annealed / Cleaned | High purity lines (if required) |
| Polished OD | Skids / visible piping |
| Bead-Rolled ID | Better flow, reduced corrosion initiation points |
1. Alloy-Specific Process Control
2. Weld Integrity for Critical Service
3. EPC & Project-Ready Supply
4. Lifecycle Cost Advantage
Higher upfront alloy cost is offset by longer service life, reduced downtime, and lower maintenance—especially in acid plants, offshore systems, and high-temperature units.
Oil & Gas (Onshore / Offshore)
Chemical & Petrochemical
Power & Process Heating
Marine & Offshore
Aerospace & High-Tech
Standard / Project Packaging
Export / Critical Alloy Packaging
Documentation
52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004
steel@inoxsteelindia.in
+91 9930796690
Monel 400 or Inconel 625. Hastelloy C22 (or C276 for reducing environments). Yes—when manufactured with controlled heat input and NDT. INOX supplies project-approved welded tubes. Yes—BV, DNV, LR, TUV on request. Which alloy is best for seawater?
Which alloy handles mixed acids best?
Are welded nickel alloy tubes reliable for critical service?
Do you provide third-party inspection?
INOX STEEL INDIA supplies ASTM B515, B516 & B626 nickel alloy and Incoloy welded tubes including Inconel 625, Monel 400, Hastelloy C22/C276 and Incoloy 825. Engineered for extreme corrosion, high temperature and pressure. EN 10204 certified, project & export ready.