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EN 10253 Type B Specialists
ASTM B366 C-22 · NiCr21Mo14W PRE ~65 · Oxidising+Reducing

2.4602 (Hastelloy C-22) Pipe Fittings

ASTM B366 buttweld pipe fittings in 2.4602 — Hastelloy C-22 (NiCr21Mo14W, N06022). The most broadly corrosion-resistant member of the Hastelloy C family. With 21% Cr (vs 16% in C-276), C-22 handles both oxidising and reducing media — making it the preferred grade for FGD scrubbers, mixed-acid service, and chloride-bearing oxidising environments where C-276 is insufficient. PRE ~65.

PRE (approx.)
~65
Cr — key advantage
21% (vs 16% in C-276)
ASTM UNS
N06022

C-22 vs C-276 — Key Difference

PropertyC-22 (2.4602)C-276 (2.4819)
UNSN06022N10276
Cr %20–22.5%14.5–16.5%
Mo %12.5–14.5%15–17%
W %2.5–3.5%3–4.5%
PRE~65~73
Oxidising mediaExcellent (high Cr)Limited
Reducing mediaExcellentExcellent (higher Mo)
Best forFGD, mixed-acid, chlorinated oxidisersConcentrated HCl, HF, reducing acids

Key Applications

  • FGD (flue gas desulphurisation) scrubbers — the standard material for absorber tower piping
  • Wet chlorine and hypochlorite service
  • Mixed-acid environments (HNO₃ + HCl, H₂SO₄ + HCl)
  • Chlorinated organic processing
  • Chemical plant multiservice piping where both oxidising and reducing conditions occur

Cross-References

W.Nr.2.4602
EN NameNiCr21Mo14W
ASTM UNSN06022
Trade NameHastelloy C-22

Welding

Filler: ERNiCrMo-10 (C-22 matching filler). No PWHT required. Solution anneal if sensitisation risk.

Request 2.4602 Quote

Testing & Inspection

  • ✓ Chemical analysis against the ordered material standard / ASTM B366
  • ✓ Tensile test, with impact test where the standard or your order requires it
  • ✓ PMI confirming Ni, Cr, Mo and W content
  • ✓ PMI (positive material identification) on every order
  • ✓ Visual and dimensional inspection to ASME B16.9
  • ✓ NDT (UT, RT, MT or PT) when your order or code calls for it
  • ✓ EN 10204 3.1 certificate as standard; 3.2 with TÜV, Lloyd's Register, Bureau Veritas, DNV or your own inspector

Size Range

DN15–DN600 and larger. Outside diameters follow the EN 10220 / EN ISO 1127 pipe series; wall thickness is matched to your connecting pipe.

SizeOD (mm)
DN 1521.3
DN 2026.9
DN 2533.7
DN 3242.4
DN 4048.3
DN 5060.3
DN 6576.1
DN 8088.9
DN 100114.3
DN 125139.7
DN 150168.3
DN 200219.1
DN 250273.0
DN 300323.9
DN 350355.6
DN 400406.4
DN 450457.0
DN 500508.0
DN 600610.0

Export Documents & Packing

  • ✓ Commercial invoice, packing list and certificate of origin
  • ✓ EN 10204 certificates with heat-number traceability
  • ✓ PED 2014/68/EU and AD 2000-Merkblatt W0 documentation for European projects
  • ✓ Seaworthy wooden cases or pallets, bevel ends protected, marked to your instructions
  • ✓ FOB, CFR or CIF delivery terms
Request a Hastelloy C-22 (2.4602) Quote

Frequently Asked Questions: Hastelloy C-22 (2.4602) Fittings

When should I choose Hastelloy C-22 over C-276?

Hastelloy C-22 (2.4602, N06022) has higher chromium (21% vs 16% in C-276) and is superior to C-276 in oxidising acid environments and mixtures of oxidising and reducing media. C-22 is the preferred choice for FGD (flue gas desulphurisation) scrubbers, wet chlorine, hypochlorite service, and process streams containing both HCl and HNO₃. C-276 (2.4819) retains the edge in purely reducing acid media such as concentrated HCl. For mixed or oxidising environments, specify C-22.

What is the designation of Hastelloy C-22?

EN 2.4602, NiCr21Mo14W, UNS N06022.

Why does C-22 handle both oxidising and reducing media?

Its 21% chromium (versus 16% in C-276) adds resistance to oxidising conditions while the molybdenum and tungsten cover reducing ones.

Further reading