Hastelloy C-22 (UNS N06022) Seamless Pipes & Tubes Manufacturer & Supplier
Hastelloy C-22 (UNS N06022) is a versatile nickel-chromium-molybdenum-tungsten alloy with better overall corrosion resistance than C-276 in oxidizing media. Its high chromium content gives outstanding resistance to wet chlorine, chlorine dioxide, nitric acid and mixed oxidizing/reducing acids, which is why it is the alloy of choice for corrosive specialty-gas and wet-chemistry lines in semiconductor fabs.
UNS: N06022 | Category: Nickel-Chromium-Molybdenum Alloy | Werkstoff Nr: 2.4602 | EN Name: NiCr21Mo14W
Size Range
Outer Diameter: 1/4" NPS to 8" NPS (6.35mm to 219.1mm OD)
Wall Thickness: SCH 5S to SCH 80S
Chemical Composition (%)
| Ni | Cr | Mo | W | Fe | Co | Mn | Si | C | V | P | S |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Remainder (~56) | 20.0-22.5 | 12.5-14.5 | 2.5-3.5 | 2.0-6.0 | 2.5 max | 0.50 max | 0.08 max | 0.015 max | 0.35 max | 0.02 max | 0.02 max |
Mechanical Properties
- Tensile Strength
- 690 MPa min
- Yield Strength
- 310 MPa min
- Elongation
- 45% min
- Hardness
- 100 HRB max
Physical Properties
- Density
- 8.69 g/cm3
- Melting Range
- 1357-1399 C
- Thermal Conductivity
- 10.1 W/m-K
- Electrical Resistivity
- 1140 nOhm-m
- Specific Heat
- 414 J/kg-K
- Coeff. of Thermal Expansion
- 12.4 um/m-C
Corrosion Resistance
- Pitting Resistance (PREN)
- ~65
- Max Service Temp (Oxidizing)
- 1040 C (short-term); 675 C continuous
- Intergranular Corrosion
- Highly resistant (very low C and Si)
- Stress Corrosion Cracking
- Immune to chloride SCC
- General Corrosion Rate
- <0.01 mm/yr in wet chlorine, HCl, HF mixtures
- Seawater Resistance
- Excellent - resists crevice corrosion in hot seawater
Applicable Standards
- ASTM B622 / ASME SB622
- ASTM B626 / ASME SB626
- ASTM B619 / ASME SB619
- DIN 17751
Applications
- Semiconductor specialty gas distribution (Cl2, HBr, HCl, BCl3)
- Fab wet-bench and chemical distribution piping (HF, HNO3, H2SO4 mixtures)
- Acid exhaust and scrubber systems
- Wet chlorine and hypochlorite handling
- Flue gas desulfurization
- Pharmaceutical and fine chemical reactors
- Pickling and plating lines
Industries Served
- Semiconductor & Electronics
- Chemical Processing
- Pharmaceutical
- FGD Systems
- Waste Treatment
Key Advantages
- Resists both oxidizing and reducing corrosive media
- Outstanding resistance to wet chlorine, HBr and HCl gas service
- Immune to chloride stress corrosion cracking
- Very low carbon and silicon minimise weld-zone precipitation
- Excellent as a universal weld filler for other C-family alloys
- Suitable for electropolished ultra-clean surface finishes
Equivalent Grades
- ASTM
- N06022
- Trade
- Hastelloy C-22 / Inconel 622
- DIN
- 2.4602