Hastelloy C22 |UNS N06022|2.4602 Seamless Tube
Distinguished by its optimized chemistry, Hastelloy C22 provides superior resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC), outperforming Alloy C276 in oxidizing environments containing wet chlorine and nitric acid. These tubes are indispensable for mission-critical applications in chemical reactors, pharmaceutical synthesizers, and flue gas desulfurization (FGD) systems. Through advanced cold-drawing and precise vacuum annealing, Tengqi ensures every tube maintains a uniform microstructure and maximum structural reliability under aggressive industrial conditions.
C22 PREN ≈ 45+
SeamlessHastelloy C22 tube (HastelloyC22 / UNS N06022 / W.Nr. 2.4602) is a Ni-Cr-Mo alloy with superior resistance to pitting and crevice corrosion in mixed acid service. Manufactured by Tengqi in Fujian, China, every heat is fully traceable, hydro-tested and available with third-party inspection (SGS / BV / TUV) on request.
Product Specifications
- ASTM B163 — Seamless Condenser & Heat Exchanger Tubes
- ASTM B167 / B407 / B423 — Seamless Tube
- ASTM B444 — Seamless Pipe & Tube
- ASTM B704 — Welded Tube
- ASTM B829 — General Requirements
- Finishing: solution annealed, pickled & polished; bright annealed available on request
Size Range
| Outside Diameter (OD) | Wall Thickness | Length |
|---|---|---|
| 6.35 mm – 257 mm (1/4"– 10.1") | 0.5 mm – 12.7 mm | ≤ 22 m |
Chemical Composition
HastelloyC22 (UNS N06022) — Composition %
| UNS | C | Mn | P | S | Si | Cr | Ni | Mo | W | Co | Fe | V |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| N06022 | ≤ 0.015 | ≤ 0.50 | ≤ 0.02 | ≤ 0.02 | ≤ 0.08 | 20.0 – 22.5 | remainder | 12.5 – 14.5 | 2.5 – 3.5 | ≤ 2.5 | 2.0 – 6.0 | ≤ 0.35 |
Mechanical Properties
| Property | Value |
|---|---|
| Delivery Condition | Solution annealed, pickled & polished |
| Tensile Strength | ≥ 690 MPa |
| Yield Strength (0.2% offset) | ≥ 310 MPa |
| Elongation in 2 in. / 50 mm | ≥ 45% |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.69 g/cm3 |
| Thermal Conductivity | 9.9 W/m·K |
| Specific Heat Capacity | 414 J/kg·K |
| Elastic Modulus | 205 GPa |
| Magnetic Properties | Practically non-magnetic |
| PREN (Pitting Resistance Equivalent) | ≥ 65.0 |
Industry Applications
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