Overview
Hastelloy C22, also known as alloy C22, is a versatile austenitic nickel-chromium-molybdenum-tungsten alloy with enhanced resistance to pitting, crevice corrosion and stress corrosion cracking. The high chromium content provides good resistance to oxidizing media while the molybdenum and tungsten content give good resistance to reducing media. This nickel steel alloy also has excellent resistance to oxidizing aqueous media including wet chlorine and mixtures containing nitric acid or oxidizing acids with chlorine ions. Other corrosives Hastelloy C-22 has resistance to are oxidizing acid chlorides, wet chlorine, formic and acetic acids, ferric and cupric chlorides, sea water, brine and many mixed or contaminated chemical solutions, both organic and inorganic.
This nickel alloy also offers optimum resistance to environments where reducing and oxidizing conditions are encountered in process streams. This is beneficial in multi-purpose plants where such"upset"conditions occur frequently. What's more, alloy C22 resists the formation of grain-boundary precipitates in the weld heat-affected zone, thus making it suitable for most chemical process applications in the as-welded condition.
Specification
ASTM B622-17b Standard Specification for Seamless Nickel and Nickel-Cobalt Alloy Pipe and Tube.
| Dimension | ASTM, ASME and API |
| Outer Diameter | 6.2500mm; WT:1-200mm |
| Pipe Size | 1/8"NB TO 30"NB IN |
| Tubes Size | 1 / 2” OD up to 5” OD, customs diameters also available |
| Schedule | SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS |
| Type | Seamless / Welded / ERW / Heat-Exchanger / Boiler Tubing |
| Length | Single Random, Double Random & Cut Length |
| End | Plain End, Beveled End, Treaded |
Equivalent Grades for Hastelloy C22 Seamless Tubes
| STANDARD | UNS | WERKSTOFF NR. | AFNOR | EN | JIS | BS | GOST |
| Hastelloy C22 | N06022 | 2.4602 | – | NiCr21Mo14W | NW 6022 | – | – |
Chemical Composition
| Hastelloy C22 | Ni | C | Mo | Mn | Si | Fe | P | S | Co | Cr |
| Balance | 0.010 max | 12.5 – 14.5 | 0.50 max | 0.08 max | 2 – 6 | 0.02 max | 0.02 max | 2.5 max | 20 – 22.5 |
Mechanical Properties
| Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 8.69 g/cm3 | 1399 °C (2550 °F) | Psi – 45000 MPa – 310 | Psi – 1,00,000 MPa – 690 | 45 % |
Alloy C22 Tubing Pressure Rating
Tube O.D. | Wall Thickness of Tube (inches) | |||||||
|---|---|---|---|---|---|---|---|---|
| .028 | .035 | .049 | .065 | .083 | .095 | .109 | .120 | |
| Working Pressure (psig) | ||||||||
| 1/8 | 7900 | 10100 | ||||||
| 1/4 | 3700 | 4800 | 7000 | 9500 | ||||
| 5/16 | 3700 | 5C22 | 7300 | |||||
| 3/8 | 3100 | 4C22 | 6100 | |||||
| 1/2 | 2300 | 3200 | 4C22 | |||||
| 3/4 | 2200 | 3000 | C220 | 4600 | ||||
| 1 | 2200 | 2900 | 3C22 | 3900 | 4300 | |||
Applications
- 1. Pharmaceutical industries use alloy C-22 fittings and tubing to avoid contamination caused by corrosion related failures.
- 2. Cellophane manufacturing.
- 3. Chlorination systems.
- 4. Pesticide production.
- 5. Incineration scrubber systems.
- 6. Chemical process industry in equipment like flue gas scrubbers, chlorination systems, sulfur dioxide scrubbers, pulp and paper bleach plants, pickling systems, and nuclear fuel reprocessing.
- 7. Waste water processing.
