Hastelloy C22 is a nickel alloy and has exceptional corrosion resistance in oxidizing and reducing environments, including harsh conditions involving chlorides, acids, and elevated temperatures. This technical datasheet outlines the material properties, standards, and fitting specifications under ASME B366.
Hastelloy C22 Material Chemical Composition
Hastelloy C22 is an austenitic nickel alloy and has superior resistance to pitting, crevice corrosion, and stress corrosion cracking compared to C276. It exhibits outstanding performance in oxidizing and reducing environments, including wet chlorine, formic acid, acetic acid, ferric chloride, and seawater.
ASME B366 Hastelloy Chemical Composition (wt.%)
|
Element |
Composition (%) |
|
Nickel (Ni) |
Balance |
|
Chromium (Cr) |
20.0 – 22.5 |
|
Molybdenum (Mo) |
12.5 – 14.5 |
|
Tungsten (W) |
2.5 – 3.5 |
|
Iron (Fe) |
2.0 – 6.0 |
|
Cobalt (Co) |
2.5 max |
|
Vanadium (V) |
0.35 max |
|
Silicon (Si) |
0.08 max |
|
Carbon (C) |
0.015 max |
|
Manganese (Mn) |
0.50 max |
|
Phosphorus (P) |
0.02 max |
|
Sulfur (S) |
0.02 max |
ASME B366 Hastelloy C22 Mechanical Properties
|
Property |
Value (min) |
|
Tensile Strength |
690 MPa (100 ksi) |
|
Yield Strength (0.2% offset) |
310 MPa (45 ksi) |
|
Elongation in 50 mm |
45% |
|
Hardness (Brinell) |
≤ 240 HB |
Governing Standards for Hastelloy C22 Buttweld Fittings
|
Standard |
Description |
|
ASME SB366 / ASTM B366 |
Factory-Made Wrought Nickel and Nickel Alloy Fittings |
|
ASME B16.9 |
Factory-Made Wrought Buttwelding Fittings |
|
ASME B16.25 |
Buttwelding Ends |
|
MSS SP-25 |
Standard Marking System for Valves, Fittings |
|
MSS SP-43 |
Wrought Stainless Steel Butt-Welding Fittings |
|
NACE MR0175 / ISO 15156 |
Materials for H2S-containing environments |
All Hastelloy C22 fittings must be supplied in the solution-annealed condition, typically 1050–1100°C followed by rapid water quenching.
ASME B366 Hastelloy C22 Buttweld Fitting Types
Under ASME B366, Hastelloy C22 fittings are designated as Grade WP (Wrought Pipe) followed by the alloy suffix. The correct material grade designations are:
|
Fitting Type |
ASME B366 Grade Designation |
Common Name |
|
Seamless & Welded Fittings |
WP22CRHC or WPHC22 |
Hastelloy C22 |
|
Seamless Fittings only |
WP22CRHC-S |
Hastelloy C22 Seamless |
|
Welded Fittings (RT or 100% X-ray) |
WP22CRHC-W |
Hastelloy C22 Welded |
Hastelloy C22 Buttweld Fitting Types
|
Fitting Type |
Schedule / Wall Thickness |
Size Range |
|
90° Long Radius Elbow |
Sch 10s, 40s, 80s, XS, XXS |
½" – 24" |
|
90° Short Radius Elbow |
Sch 10s, 80s, XS |
1" – 12" |
|
45° Long Radius Elbow |
Sch 10s – XXS |
½" – 24" |
|
180° Long Radius Return |
Sch 10s – 80s |
½" – 12" |
|
Equal Tee |
Sch 10s – XXS |
½" – 24" |
|
Reducing Tee |
Sch 10s – XXS |
½" – 24" |
|
Concentric Reducer |
Sch 10s – XXS |
¾×½ – 24×20 |
|
Eccentric Reducer |
Sch 10s – XXS |
¾×½ – 24×20 |
|
Stub End (Lap Joint) |
Sch 10s, 40s, 80s |
½" – 24" |
|
Pipe Cap |
Sch 10s – XXS |
½" – 24" |
|
Cross (Equal & Reducing) |
Sch 10s – 80s |
½" – 20" |
|
Lateral (45°Y-piece) |
Sch 10s – 80s |
2" – 20" |
Conclusion
When sourcing critical-service Hastelloy C22 buttweld pipe fittings, always specify "ASME B366 Grade WPHC22" or WP22CRHC manufactured to ASME B16.9. This ensures full compliance with international pressure vessel and piping codes (ASME Section VIII, B31.3, etc.) and guarantees the highest level of corrosion performance in aggressive chemical, petrochemical, pharmaceutical, and flue gas desulfurization applications.
We maintain a ready stock of seamless Hastelloy C22 elbows, tees, reducers, and caps in Sch 10s, 40s, and 80s from ½" to 12", with larger sizes and welded constructions available on short lead times.
For quotations, please contact our team directly.
