ASTM B626
ASTM B626 – Welded Nickel & Nickel-Cobalt Alloy Tubes
ASTM B626 covers welded, welded-and-drawn, and heavily cold-worked nickel and nickel-cobalt alloy tubes intended for general corrosion-resistant, heat-resistant, and high-strength applications. These tubes are commonly used in chemical processing, petrochemical units, pollution control systems, and high-temperature environments.
This specification ensures high-quality welded tubing that meets strict requirements for corrosion resistance, mechanical properties, weld integrity, and dimensional accuracy.
Key Features
Excellent corrosion resistance in oxidizing, reducing, and chloride-rich environments
High weld integrity with full penetration and no defects in the welded seam
Superior mechanical strength even at elevated temperatures
Suitable for critical chemical and petrochemical environments
Available in welded & welded-and-drawn conditions
Technical Specification
| Property | Description |
|---|---|
| Standard | ASTM B626 |
| Product Form | Welded, Welded-and-Drawn & Heavily Cold-Worked Tubes |
| Manufacturing Process | Welding + Drawing / Cold Working |
| Welding Method | TIG / Plasma / Laser (as applicable) |
| Heat Treatment | Solution Annealed |
| Surface Finish | Annealed, Pickled, Bright Annealed |
| Testing | Weld Integrity Test, NDT, Hydrotest, Eddy Current |
| Applications | Corrosion & heat-resistant service |
Grades
- UNS N10001
- UNS N10665
- UNS N10276
- UNS N06022
- UNS N06030
- UNS N06455
- UNS N06007
- UNS N08031
- UNS N06686
Manufacturing Process
High-quality welded tube manufacturing
TIG / Plasma / Laser welded seam
Solution annealing to restore corrosion resistance
Weld bead smoothing / cold-working for improved properties
Welded-and-drawn option for enhanced dimensional precision
Hydrostatic testing and eddy current testing
PMI & NDT as per ASTM B626 requirements
Product Types Under ASTM B626
Welded Tubes
Welded & Drawn Tubes
Heavily Cold Worked Tubes
Heat Exchanger Tubes
Condenser Tubes
Instrumentation Tubes
Superheater & Boiler Tubes (grade dependent)
Applications
Chemical Processing Plants
Petrochemical Units
Heat Exchangers & Condensers
Pollution Control Equipment
Oil & Gas Process Systems
High-Temperature Furnace Tubing
Marine & Offshore Equipment
Pharmaceutical Processing Lines
Pulp & Paper Industry