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Hastelloy C-22, C-4 and C-2000 Low-Carbon Ni-Cr-Mo Butt Weld Fittings
Hastelloy C-22 (N06022), C-4 (N06455) and C-2000 (N06200) butt weld fittings to ASME SB-366 and B16.9. Low-C Ni-Cr-Mo for scrubbers, pulp bleach and sour gas.
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The Hastelloy C family is defined by low carbon plus a controlled addition of copper or tungsten, and it occupies the middle ground between C-276 and the more corrosion-exotic alloys. C-22 raises chromium and adds tungsten for oxidising and reducing balance; C-4 trades some of that for a lower-cost, high-chromium-low-nickel variant; C-2000 adds copper for broader acid coverage. All three are low-carbon Ni-Cr-Mo alloys, and all three are specified where C-276 alone leaves a gap.
Product range
90° and 45° elbows, 180° returns, equal and reducing tees, concentric and eccentric reducers, caps and lap-joint stub ends to ASME B16.9, in solution-annealed condition with bevelled ends. Socket weld and threaded fittings to B16.11 on request. MSS SP-43 and SP-95 geometries available. Companion forged flanges to SB-462 and B16.47 are quoted alongside.
Material specifications and grades
| ASME spec | Product form | Grades (UNS) |
|---|---|---|
| SB-366 / SB-366M | Wrought BW & SW fittings | N06022, N06455, N06200 |
| SB-462 | Forged flanges, forged fittings | N06022, N06200 |
| SB-574 | Rod | N06022, N06455, N06200 |
| SB-575 | Plate, sheet, strip | N06022, N06455, N06200 |
| SB-626 | Welded tube | N06022, N06455, N06200 |
Composition, ASME SB-575 Table 1 (% by weight)
| Element | C-22 (N06022) | C-4 (N06455) | C-2000 (N06200) |
|---|---|---|---|
| Nickel | Remainder | Remainder | Remainder |
| Chromium | 20.0–22.5 | 14.0–18.0 | 22.0–24.0 |
| Molybdenum | 12.5–14.5 | 14.0–17.0 | 15.0–17.0 |
| Iron | 2.0–6.0 | 3.0 max | 3.0 max |
| Copper | — | — | 0.50 max |
| Tungsten | 2.5–3.5 | — | — |
| Carbon, max | 0.015 | 0.015 | 0.010 |
| Cobalt, max | 2.5 | 2.0 | 0.3 |
C-22 carries tungsten (2.5–3.5%) that neither C-4 nor C-2000 contains. If your datasheet cites tungsten, the grade is C-22 — this is a fast way to catch a mislabelled heat.
Mechanical properties, ASME SB-575 Table 2
| Property | C-22 | C-4 | C-2000 |
|---|---|---|---|
| Tensile strength, min | 100,000 psi (690 MPa) | 100,000 psi (690 MPa) | 100,000 psi (690 MPa) |
| Yield strength (0.2% offset), min | 45,000 psi (310 MPa) | 40,000 psi (276 MPa) | 45,000 psi (310 MPa) |
| Elongation in 2 in., min | 45% | 40% | 45% |
Solution annealing, ASME SB-366 Table 3
| Grade | Temperature | Quench | Footnote |
|---|---|---|---|
| C-22 (N06022) | 2050 °F [1121 °C] | Rapid air/water | D |
| C-4 (N06455) | 1950 °F [1065 °C] | Rapid air/water | D |
| C-2000 (N06200) | 2075–2125 °F [1135–1163 °C] | Rapid air/water | — |
Both C-22 and C-4 carry footnote D in SB-366 Table 3, which reads “Minimum temperature.” Where a lower-temperature variant of these alloys is required for a given service condition, that minimum must be agreed with the manufacturer rather than assumed. C-2000 carries no footnote.
Applications
C-22 for flue-gas desulphurisation scrubbers, wet chlorine, hypochlorite and bleach handling, seawater and aggressive chemical environments, and sour gas where chloride stress-corrosion cracking is a concern. C-4 for hydrochloric and sulphuric acid service, pulp bleaching, and general acid handling. C-2000 for reducing and oxidising acid mixes including nitric-hydrofluoric blends, and for seawater where higher copper improves acid resistance.
Inspection and certification
EN 10204 3.1 certificates standard; 3.2 and customer-specific MTR formats on request. Available inspection: PMI, tensile and hardness per lot, ASTM G-28 intergranular corrosion, ferrite checks, and third-party witness by SGS, BV or Lloyd’s Register.
Ordering information
Please specify grade (N06022 / N06455 / N06200), NPS size, wall thickness or schedule, quantity, end preparation and certification level. Send the process media and operating temperature if the grade is not yet fixed — we will confirm suitability before pricing.
