Hastelloy C22 Pipe Fittings
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Hastelloy C22 Pipe Fittings Supplier in Mumbai, India
Nicorex Alloys is an ISO 9001 and ISO 14001 certified importer, stockist, and supplier of Hastelloy C22 pipe fittings based in Mumbai, India. We supply buttweld fittings manufactured to ASTM B366 (designation WPHC22 / CRHC22), UNS N06022.
Hastelloy C22 (UNS N06022, Werkstoff 2.4602) delivers a CCT of 80°C in acidified 6% FeCl₃, 25°C, making C22 the most crevice-resistant Ni-Cr-Mo fitting grade available. The alloy’s nominal composition of 56% Ni, 22% Cr, 13% Mo, and 3% W with carbon ≤0.01% provides balanced resistance to both oxidising and reducing acids. Buttweld fittings (elbows, tees, reducers, caps, stub ends, crosses) conform to ASME B16.9. All fittings are solution annealed at ≥1121°C with rapid quench. Sizes span NPS 1/2″ to 24″ for buttweld.
No post-weld heat treatment is required after field welding C22 fittings to C22 or C276 pipe. Minimum tensile strength is 690 MPa (100 ksi) with 45% elongation in the solution-annealed condition. Applications include multipurpose CPI reactor piping, pharmaceutical process piping, FGD ducting, nuclear fuel reprocessing, and seawater cooling system fittings.
Hastelloy C22 Pipe Fittings – Specifications
The following table shows the detailed specifications for Hastelloy C22 pipe fittings, which must meet material, dimensional, size, and heat treatment criteria.
| Material Standards | ASTM B366 / ASME SB366 |
|---|---|
| Fitting Designation | WPHC22 (ASME pressure service), CRHC22 (corrosion-resistant service) |
| Dimensional Standards | ASME B16.9, B16.28, MSS SP-43, SP-79, SP-83, SP-95, BS 3799 |
| Size Range | NPS 1/2″ to 24″ (DN15 to DN600) |
| Schedule / Wall Thickness | SCH 5S, 10S, 10, 20, 40S, 40 (STD), 60, 80S, 80 (XS), 100, 120, 140, 160, XXS |
| Bending Radius (Elbows) | R = 1D, 1.5D (LR), 2D, 3D, 5D |
| Fitting Types | 90° Elbow (LR/SR), 45° Elbow, 180° Return Bend, Equal Tee, Reducing Tee, Barred Tee, Concentric Reducer, Eccentric Reducer, Cap, Stub End, Cross |
| End Connections | Butt weld (bevelled per ASME B16.25) |
| Source Material | Seamless pipe/tube (B622), Welded pipe (B619), Plate/strip (B575) |
| Manufacturing Method | Hot forming, cold forming from wrought UNS N06022 |
| Heat Treatment | Solution annealed at ≥1121°C (2050°F) + rapid water quench |
| Surface Finish | As-annealed, pickled, or electropolished (pharmaceutical/sanitary) |
| ASME P-Number | P-43 |
| Testing | Hardness, tensile (representative coupons), visual, dimensional per ASME B16.9 |
Chemical Composition of Hastelloy C22 Pipe Fittings
The chemical composition of Hastelloy C22 pipe fittings per ASTM B366 conforms to UNS N06022, with the same Cr-Mo balance that defines C22’s versatility.
| Material / Element | Nickel (Ni) | Chromium (Cr) | Molybdenum (Mo) | Tungsten (W) | Iron (Fe) | Cobalt (Co) | Manganese (Mn) | Vanadium (V) | Silicon (Si) | Carbon (C) | Phosphorus (P) | Sulphur (S) | Copper (Cu) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Specification Range (%) | Balance (≥56) | 20.0–22.5 | 12.5–14.5 | 2.5–3.5 | 2.0–6.0 | 2.5 max | 0.50 max | 0.35 max | 0.08 max | 0.015 max | 0.02 max | 0.02 max | 0.50 max |
| Nominal (%) | 56 | 22 | 13 | 3 | 3 | — | — | — | 0.08 | 0.01 | — | — | — |
B366 buttweld fittings are made from B622 seamless pipe, B619 welded pipe, or B575 plate. At crevice-prone geometries, C22 fittings’ 22% Cr drives passive film stability and gives them an 80°C CCT advantage over C276 fittings (55°C).
Mechanical Properties of Hastelloy C22 Pipe Fittings
ASTM B366 sets the minimum strength requirements for Hastelloy C22 (UNS N06022):
| Property | Tensile Strength, min | Yield Strength 0.2%, min | Elongation, min | Hardness, max (sour service) | Charpy V-Notch Impact, typical (RT) | Charpy V-Notch Impact, typical (-196°C) |
|---|---|---|---|---|---|---|
| Value / Condition | 690 MPa (100 ksi) — ASTM B366, RT | 310 MPa (45 ksi) — ASTM B366, RT | 45% — ASTM B366, RT | 241 HBW (≤35 HRC) — NACE MR0175 / ISO 15156 | 568 J (419 ft-lbf) — RT | 469 J (346 ft-lbf) — −196°C |
For cryogenic or low-temperature service, specify Charpy impact as a complement to B366. For NACE MR0175 sour service, solution-annealed HBW must be ≤241. All fittings must be solution annealed at 1121–1177°C with rapid water quenching after final forming.
Physical Properties of Hastelloy C22 Pipe Fittings
Physical properties of Hastelloy C22 fittings relevant to piping system weight calculations and thermal design are listed below.
| Property | Density | Melting Range | Thermal Conductivity | Modulus of Elasticity | CTE (24–100°C) | Magnetic Permeability |
|---|---|---|---|---|---|---|
| Value | 8.69 g/cm³ (0.314 lb/in³) | 1357–1399°C (2475–2550°F) | 10.1 W/m·°C at 50°C | 206 GPa at RT | 12.4 µm/m·°C | Non-magnetic |
C22 fittings weigh approximately 9% more than equivalent 316L fittings (8.69 vs 7.98 g/cm³) but ~2% less than C276 fittings (8.89 g/cm³). For large-bore overhead piping, the weight difference between C22 and C276 fittings is negligible.
Hastelloy C22 Pipe Fittings – Equivalent Grades
The Hastelloy C22 pipe fittings are recognised under several international designations. The primary equivalent is UNS N06022.
| Property | UNS | Werkstoff | EN | DIN | JIS |
|---|---|---|---|---|---|
| Designation | N06022 | 2.4602 | NiCr21Mo14W | 17744 | NW 6022 |
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Types of Hastelloy C22 Pipe Fittings
We supply all Hastelloy C22 buttweld pipe fitting types, ensuring maximum corrosion resistance.
Hastelloy C22 Elbow (45° / 90° / 180°)
Hastelloy C22 Tee Fittings
Hastelloy C22 Reducer (Concentric / Eccentric)
Hastelloy C22 Cap
Hastelloy C22 Stub End
Hastelloy C22 Cross
Hastelloy C22 Pipe Bend
Hastelloy C22 Pipe Nipple
Industries Using Hastelloy C22 Pipe Fittings
Hastelloy C22 pipe fittings serve the same industries as C22 piping, with particular value where crevice-prone fitting geometries face aggressive chloride and acid environments.
- Chemical Processing & Reactor Piping: Multipurpose batch plants with oxidising and reducing acid campaigns use reactor piping manifold fittings. A typical multifunctional reactor requires 15–25 C22 fittings per 100 m of pipe.
- Pharmaceutical & Food Processing: The C22 fittings in API synthesis piping handle both halogenated process solvents and oxidising CIP cleaning solutions (HNO₃ wash, peracetic acid). Electropolished fittings serve high-purity applications.
- Nuclear Fuel Reprocessing: Piping fittings for dissolved nuclear fuel handling circuits. C22 fittings resist hot nitric acid far better than C276 fittings (0.05 vs 0.46 mm/yr at 70% HNO₃, 66°C). ASME Section III Code Case N-621-1 covers C22 for nuclear service.
- Flue Gas Desulfurization (FGD): The FGD scrubber ducting uses large-bore elbows and reducers. Mixed oxidising-reducing chemistry favours C22 over C276, where the ferric chloride component is significant.
- Oil & Gas / Sour Service: Fittings in sour gas piping meet NACE MR0175 (max ≤241 HBW). Barred tees at gathering manifolds are common applications.
- Marine & Offshore: Seawater cooling piping fittings; C22 showed zero crevice attack in 180-day U.S. Navy testing at LaQue Laboratories.
How to Order Hastelloy C22 Pipe Fittings from Nicorex Alloys
To order Hastelloy C22 pipe fittings from Nicorex Alloys, provide the following details:
- Standard: ASTM B366 / ASME SB366 (buttweld)
- Designation: WPHC22 (pressure) or CRHC22 (corrosion-resistant)
- Fitting Type: Elbow (45/90/180°), Tee, Reducer, Cap, Stub End, Cross
- Size: NPS
- Schedule: as required
- Radius: LR (1.5D) or SR (1D) for elbows
- End Connection: Butt weld
- Dimensional Standard: ASME B16.9 / B16.28 / MSS SP-43
- NACE MR0175 compliance (if sour service)
- Certification: MTC 3.1 per EN 10204
C22 fittings pair with either C22 or C276 pipe using ERNiCrMo-10 filler metal. Specify matching fittings for all joints to avoid a single corrosion-vulnerable fitting compromising the system.
Frequently Asked Questions
What is the Price of Hastelloy C22 Pipe Fittings per Kg in India?
C22 fittings are comparably priced to C276 fittings, as both are premium Ni-Cr-Mo alloys. Price depends on fitting type, size, schedule, and current nickel/chromium/molybdenum market rates. Contact Nicorex Alloys for competitive pricing with batch availability and MTC 3.1 certification.
Why Choose C22 Fittings Over C276 Fittings?
C22 fittings provide a CCT of 80°C vs 55°C for C276 in acidified 6% FeCl₃, giving 25°C more crevice corrosion margin at gasket faces and weld roots. Choose C22 fittings when crevice corrosion, oxidising acids, or mixed environments are your primary concerns.
Can C22 Fittings Be Welded to C276 Pipe?
Yes. C22 fittings are routinely welded to C276 pipe using ERNiCrMo-10 (C22) filler metal. No PWHT is required. Both alloys are ASME P-Number 43, so a single WPS covers the joint.
What Advantage Do C22 Fittings Provide in Pharmaceutical Piping?
Halogenated solvents, strong acids, and oxidising cleaning agents attack pharmaceutical process pipes. The balanced 22% Cr / 13% Mo composition of C22 fittings resists both reducing and oxidising agents throughout manufacture and cleaning cycles.