Hastelloy C-22 is a versatile nickel-chromium-molybdenum-tungsten alloy renowned for its exceptional resistance to a wide range of corrosive environments, including both oxidizing and reducing conditions. This alloy offers superb resistance to pitting, crevice corrosion, and stress corrosion cracking in harsh chemical environments containing chlorides, sulfuric acid, phosphoric acid, and other aggressive chemicals.
Its composition includes nickel, chromium, molybdenum, tungsten, and trace amounts of other elements. Hastelloy C-22 is commonly used in various applications across chemical processing, pollution control, pulp and paper, and pharmaceutical industries. Its properties make it well-suited for use in reactors, heat exchangers, scrubbers, and other equipment where corrosion resistance and reliability are paramount.
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| Physical Property | Imperial Units | Metric Units | ||
| Density | RT | 0.314 lb/in3 | RT | 8.69 g/cm3 |
| Melting Range | 2475-2550°F | — | 1357-1399°C | — |
| Electrical Resistivity | RT | 44.9 μ0hm.in | RT | 1.14 μ0hm.m |
| 200°F | 48.0 μ0hm.in | 100°C | 1.23 μ0hm.m | |
| 400°F | 48.8 μ0hm.in | 200°C | 1.24 μ0hm.m | |
| 600°F | 49.3 μ0hm.in | 300°C | 1.25 μ0hm.m | |
| 800°F | 49.7 μ0hm.in | 400°C | 1.26 μ0hm.m | |
| 1000°F | 50.1 μ0hm.in | 500°C | 1.27 μ0hm.m | |
| — | — | 600°C | 1.28 μ0hm.m | |
| Thermal Conductivity | RT | 69 btu.in/h.ft2.°F | RT | 10.1 W/m.°C |
| 200°F | 76 btu.in/h.ft2.°F | 100°C | 11.1 W/m.°C | |
| 400°F | 94 btu.in/h.ft2.°F | 200°C | 13.4 W/m.°C | |
| 600°F | 110 btu.in/h.ft2.°F | 300°C | 15.5 W/m.°C | |
| 800°F | 125 btu.in/h.ft2.°F | 400°C | 17.5 W/m.°C | |
| 1000°F | 139 btu.in/h.ft2.°F | 500°C | 19.5 W/m.°C | |
| — | — | 600°C | 21.3 W/m.°C | |
| Thermal Diffusivity | RT | 0.004 in2/s | RT | 0.027 cm2/s |
| 200°F | 0.005 in2/s | 100°C | 0.030 cm2/s | |
| 400°F | 0.005 in2/s | 200°C | 0.035 cm2/s | |
| 600°F | 0.006 in2/s | 300°C | 0.039 cm2/s | |
| 800°F | 0.007 in2/s | 400°C | 0.042 cm2/s | |
| 1000°F | 0.007 in2/s | 500°C | 0.046 cm2/s | |
| — | — | 600°C | 0.048 cm2/s | |
| Mean Coefficient of Thermal Expansion | 75-200°F | 6.9 μin/in. °F | 24-100°C | 12.4 μm/m.°C |
| 75-400°F | 6.9 μin/in. °F | 24-200°C | 12.4 μm/m.°C | |
| 75-600°F | 7.0 μin/in. °F | 24-300°C | 12.6 μm/m.°C | |
| 75-800°F | 7.4 μin/in. °F | 24-400°C | 13.1 μm/m.°C | |
| 75-1000°F | 7.7 μin/in. °F | 24-500°C | 13.7 μm/m.°C | |
| 75-1200°F | 8.1 μin/in. °F | 24-600°C | 14.3 μm/m.°C | |
| 75-1400°F | 8.5 μin/in. °F | 24-700°C | 14.9 μm/m.°C | |
| 75-1600°F | 8.8 μin/in. °F | 24-800°C | 15.5 μm/m.°C | |
| 75-1800°F | 9.0 μin/in. °F | 24-900°C | 15.9 μm/m.°C | |
| Specific Heat | 100°F | 0.098 Btu/lb.°F | 50°C | 414 J/kg.°C |
| 200°F | 0.101 Btu/lb.°F | 100°C | 423 J/kg.°C | |
| 400°F | 0.106 Btu/lb.°F | 200°C | 444 J/kg.°C | |
| 600°F | 0.111 Btu/lb.°F | 300°C | 460 J/kg.°C | |
| 800°F | 0.114 Btu/lb.°F | 400°C | 476 J/kg.°C | |
| 1000°F | 0.118 Btu/lb.°F | 500°C | 485 J/kg.°C | |
| — | — | 600°C | 514 J/kg.°C | |
| Dynamic Modulus of Elasticity | RT | 29.9 x 106 psi | RT | 206 GPa |
| 200°F | 29.4 x 106 psi | 200°C | 197 GPa | |
| 400°F | 28.5 x 106 psi | 300°C | 191 GPa | |
| 600°F | 27.6 x 106 psi | 400°C | 185 GPa | |
| 800°F | 26.6 x 106 psi | 500°C | 179 GPa | |
| 1000°F | 25.7 x 106 psi | 600°C | 174 GPa | |
| 1200°F | 24.8 x 106 psi | 700°C | 168 GPa | |
| 1400°F | 23.6 x 106 psi | 800°C | 160 GPa | |
| 1600°F | 22.4 x 106 psi | 900°C | 152 GPa | |
| 1800°F | 21.1 x 106 psi | 1000°C | 144 GPa | |
| Melting Range | 2475 – 2550°F | — | 1357 – 1399 °C | — |
RT= Room Temperature
| Form | Thickness/ Bar Diameter | Test Temperature | 0.2% Offset Yield Strength | Ultimate Tensile Strength | Elongation | ||||
| in. | mm. | °F | °C | ksi | MPa | ksi | MPa | % | |
| Sheet | 0.028-0.125 | 0.7-3.2 | RT | RT | 59 | 407 | 116 | 800 | 57 |
| Sheet | 0.028-0.125 | 0.7-3.2 | 200 | 93 | 54 | 372 | 110 | 758 | 58 |
| Sheet | 0.028-0.125 | 0.7-3.2 | 400 | 204 | 44 | 303 | 102 | 703 | 57 |
| Sheet | 0.028-0.125 | 0.7-3.2 | 600 | 316 | 42 | 286 | 98 | 676 | 62 |
| Sheet | 0.028-0.125 | 0.7-3.2 | 800 | 427 | 41 | 283 | 95 | 655 | 67 |
| Sheet | 0.028-0.125 | 0.7-3.2 | 1000 | 538 | 40 | 276 | 91 | 627 | 61 |
| Sheet | 0.028-0.125 | 0.7-3.2 | 1200 | 649 | 36 | 248 | 85 | 586 | 65 |
| Sheet | 0.028-0.125 | 0.7-3.2 | 1400 | 760 | 35 | 241 | 76 | 524 | 63 |
| Plate | 0.25-0.75 | 6.4-19.1 | RT | RT | 54 | 372 | 114 | 786 | 62 |
| Plate | 0.25-0.75 | 6.4-19.1 | 200 | 93 | 49 | 338 | 107 | 738 | 65 |
| Plate | 0.25-0.75 | 6.4-19.1 | 400 | 204 | 41 | 283 | 98 | 676 | 66 |
| Plate | 0.25-0.75 | 6.4-19.1 | 600 | 316 | 36 | 248 | 95 | 655 | 68 |
| Plate | 0.25-0.75 | 6.4-19.1 | 800 | 427 | 35 | 241 | 92 | 634 | 68 |
| Plate | 0.25-0.75 | 6.4-19.1 | 1000 | 538 | 34 | 234 | 88 | 607 | 67 |
| Plate | 0.25-0.75 | 6.4-19.1 | 1200 | 649 | 32 | 221 | 83 | 572 | 69 |
| Plate | 0.25-0.75 | 6.4-19.1 | 1400 | 760 | 31 | 214 | 76 | 524 | 68 |
| Bar | 0.5-2.0 | 12.7-50.8 | RT | RT | 52 | 359 | 111 | 765 | 70 |
| Bar | 0.5-2.0 | 12.7-50.8 | 200 | 93 | 45 | 310 | 105 | 724 | 73 |
| Bar | 0.5-2.0 | 12.7-50.8 | 400 | 204 | 38 | 262 | 96 | 662 | 74 |
| Bar | 0.5-2.0 | 12.7-50.8 | 600 | 316 | 34 | 234 | 92 | 634 | 79 |
| Bar | 0.5-2.0 | 12.7-50.8 | 800 | 427 | 31 | 214 | 89 | 614 | 79 |
| Bar | 0.5-2.0 | 12.7-50.8 | 1000 | 538 | 29 | 200 | 84 | 579 | 80 |
| Bar | 0.5-2.0 | 12.7-50.8 | 1200 | 649 | 28 | 193 | 80 | 552 | 80 |
| Bar | 0.5-2.0 | 12.7-50.8 | 1400 | 760 | 29 | 200 | 72 | 496 | 77 |
Values are averages from numerous tests
RT= Room Temperature
| Test Temperature | Impact Strength | ||
| °F | °C | ft-lbf | J |
| RT | RT | 419 | 568 |
| -320 | -196 | 346 | 469 |
Impact strengths were generated using Charpy V-notch samples, machined from mill annealed plate.
RT= Room Temperature
| Form | Hardness, HRBW | Typical ASTM Grain Size |
| Sheet | 88 | 3.5 – 5.5 |
| Plate | 88 | 0 – 4.5 |
| Bar | 84 | 1 – 3.5 |
All samples tested in solution-annealed condition.
HRBW = Hardness Rockwell “B”, Tungsten Indentor.
| Conc. Wt. % | 50°F | 75°F | 100°F | 125°F | 150°F | 175°F | 200°F | 225°F | Boiling |
| 10°C | 24°C | 38°C | 52°C | 66°C | 79°C | 93°C | 107°C | ||
| 2.5 | — | — | — | — | — | — | — | — | 0.02 |
| 5 | — | — | — | — | — | — | 0.01 | — | 0.76 |
| 7.5 | — | — | — | — | — | 0.01 | 0.45 | — | — |
| 10 | — | — | — | — | — | 0.01 | 1.50 | — | — |
| 15 | — | — | — | 0.01 | <0.01 | 0.88 | — | — | — |
| 20 | — | — | — | 0.01 | 0.46 | 0.8 | — | — | — |
| 25 | — | — | <0.01 | 0.20 | 0.29 | 0.58 | 0.97 | — | — |
| 30 | — | — | 0.11 | 0.23 | 0.29 | 0.59 | 1.12 | — | — |
| 40 | — | — | 0.07 | 0.13 | 0.21 | 0.34 | 0.66 | — | — |
All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254.
Data are from Corrosion Laboratory Jobs 15-02, 27-02, and 37-02.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.
| Conc. Wt. % | 50°F | 75°F | 100°F | 125°F | 150°F | 175°F | 200°F | 225°F | Boiling |
| 10°C | 24°C | 38°C | 52°C | 66°C | 79°C | 93°C | 107°C | ||
| 1 | — | — | — | — | — | — | 0.01 | — | 0.06 |
| 1.5 | — | — | — | — | — | — | — | — | — |
| 2 | — | — | — | — | — | — | — | — | — |
| 2.5 | — | — | — | — | — | — | — | — | — |
| 3 | — | — | — | — | — | — | — | — | — |
| 3.5 | — | — | — | — | — | — | — | — | — |
| 4 | — | — | — | — | — | — | — | — | — |
| 4.5 | — | — | — | — | — | — | — | — | — |
| 5 | — | — | <0.01 | — | 0.44 | 1.44 | 3.02 | — | 8.99 |
| 7.5 | — | — | — | — | — | — | — | — | — |
| 10 | — | — | 0.01 | 0.28 | 0.98 | 1.99 | 4.39 | — | 11.68 |
| 15 | — | — | — | — | 0.98 | 1.91 | — | — | 11.02 |
| 20 | — | — | 0.20 | 0.32 | 0.90 | 1.72 | 3.38 | — | 9.73 |
All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254. Data are from Corrosion Laboratory Jobs 442-82 and 176-83. All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.
| Conc. Wt. % | 50°F | 75°F | 100°F | 125°F | 150°F | 175°F | 200°F | 225°F | Boiling |
| 10°C | 24°C | 38°C | 52°C | 66°C | 79°C | 93°C | 107°C | ||
| 10 | — | — | — | — | <0.01 | — | 0.01 | — | 0.01 |
| 20 | — | — | — | — | 0.01 | — | 0.02 | — | 0.06 |
| 30 | — | — | — | — | 0.01 | — | 0.02 | — | 0.13 |
| 40 | — | — | — | — | 0.02 | 0.03 | 0.09 | — | 0.26 |
| 50 | — | — | — | — | — | 0.05 | 0.14 | 0.33 | 0.59 |
| 60 | — | — | — | — | 0.06 | 0.08 | 0.19 | 0.57 | 1.09 |
| 70 | — | — | — | — | 0.05 | 0.11 | 0.33 | 0.71 | 2.53 |
All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254. Data are from Corrosion Laboratory Jobs 443-82 and 47-04. All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.
| Conc. Wt. % | 50°F | 75°F | 100°F | 125°F | 150°F | 175°F | 200°F | 225°F | Boiling |
| 10°C | 24°C | 38°C | 52°C | 66°C | 79°C | 93°C | 107°C | ||
| 50 | — | — | — | — | — | — | — | — | 0.07 |
| 60 | — | — | — | — | 0.08 | — | — | — | 0.16 |
| 65 | — | — | — | — | — | — | — | — | — |
| 70 | — | — | — | — | 0.07 | 0.13 | — | — | 0.23 |
| 75 | — | — | — | — | 0.05 | 0.12 | — | — | 0.19 |
| 80 | — | — | — | — | 0.06 | 0.12 | 0.16 | — | 0.25 |
| 85 | — | — | — | — | 0.07 | 0.12 | 0.20 | — | 0.66 |
All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254. Data are from Corrosion Laboratory Jobs 443-82 and 47-04. All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.
| Conc. Wt. % | 75°F | 100°F | 125°F | 150°F | 175°F | 200°F | 225°F | 250°F | 275°F | Boiling |
| 24°C | 38°C | 52°C | 66°C | 79°C | 93°C | 107°C | 121°C | 135°C | ||
| 1 | — | — | — | — | — | — | — | — | — | — |
| 2 | — | — | — | — | — | 0.01 | — | — | — | 0.13 |
| 3 | — | — | — | — | — | — | — | — | — | — |
| 4 | — | — | — | — | — | — | — | — | — | — |
| 5 | — | — | — | <0.01 | 0.01 | 0.03 | — | — | — | 0.23 |
| 10 | — | — | — | — | 0.02 | 0.04 | — | — | — | 0.29 |
| 20 | — | — | — | 0.01 | 0.03 | 0.28 | — | — | — | 0.83 |
| 30 | — | — | — | 0.01 | 0.09 | 0.68 | — | — | — | 1.89 |
| 40 | — | — | 0.01 | 0.01 | 0.31 | 0.87 | — | — | — | 3.99 |
| 50 | — | — | — | 0.02 | 0.40 | 0.77 | 2.18 | — | — | 9.98 |
| 60 | — | — | 0.01 | — | 0.67 | 0.95 | 2.69 | 7.62 | — | — |
| 70 | — | — | — | 0.28 | 0.56 | 0.94 | 3.07 | 14.94 | — | — |
| 80 | — | — | 0.09 | — | 1.44 | 2.16 | 3.68 | 3.58 | — | — |
| 90 | — | — | — | 0.34 | 0.89 | 1.80 | 6.27 | 4.24 | — | — |
| 96 | — | — | — | 0.10 | — | 1.10 | — | — | — | — |
All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254. Data are from Corrosion Laboratory Jobs 319-82, 445-82, and 19-14. All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.
| Chemical | Concentration | 100°F | 125°F | 150°F | 175°F | 200°F | Boiling |
| wt. % | 38°C | 52°C | 66°C | 79°C | 93°C | ||
| Acetic Acid | 99 | — | — | — | — | — | 0 |
| Formic Acid | 88 | — | — | — | — | — | <0.01 |
| Hydrobromic Acid |
2.5 | — | — | — | — | — | 0.02 |
| 5 | — | — | — | — | — | 0.76 | |
| 7.5 | — | — | — | 0.01 | — | — | |
| 10 | — | — | — | 0.01 | — | — | |
| 15 | — | 0.01 | <0.01 | 0.88 | — | — | |
| 20 | — | 0.01 | 0.46 | 0.80 | — | — | |
| 25 | <0.01 | 0.20 | 0.29 | 0.58 | — | — | |
| 30 | 0.11 | 0.23 | 0.29 | 0.59 | — | — | |
| 40 | 0.07 | 0.13 | 0.21 | 0.34 | — | — | |
| Hydrochloric Acid |
1 | — | — | — | — | 0.01 | 0.06 |
| 5 | <0.01 | — | 0.44 | — | — | — | |
| 7.5 | — | — | — | — | — | — | |
| 10 | 0.01 | 0.28 | 0.98 | — | — | — | |
| 15 | — | — | — | — | — | — | |
| 20 | 0.20 | 0.32 | 0.90 | — | — | — | |
| Hydrofluoric Acid* |
5 | 0.04 | 0.15 | 0.47 | 0.58 | — | — |
| 10 | 0.09 | 0.33 | 0.64 | 0.78 | — | — | |
| 20 | 0.22 | 0.53 | 0.95 | 1.65 | — | — | |
| Nitric Acid |
10 | — | — | <0.01 | — | 0.01 | 0.01 |
| 20 | — | — | 0.01 | — | 0.02 | 0.06 | |
| 30 | — | — | 0.01 | — | 0.0.2 | 0.13 | |
| 40 | — | — | 0.02 | — | 0.09 | 0.26 | |
| 50 | — | — | — | — | 0.14 | 0.59 | |
| 60 | — | — | 0.06 | — | 0.19 | 1.09 | |
| 65 | — | — | — | — | — | — | |
| 70 | — | — | 0.05 | — | 0.33 | 2.53 | |
| Phosphoric Acid |
50 | — | — | — | — | — | 0.07 |
| 60 | — | — | — | — | — | 0.16 | |
| 70 | — | — | — | — | — | 0.23 | |
| 75 | — | — | — | — | — | 0.19 | |
| 80 | — | — | — | — | — | 0.25 | |
| 85 | — | — | — | — | — | 0.66 | |
| Sulfuric Acid |
10 | — | — | — | 0.02 | 0.04 | 0.29 |
| 20 | — | — | 0.01 | 0.03 | 0.28 | 0.83 | |
| 30 | — | — | 0.01 | 0.09 | 0.68 | — | |
| 40 | — | — | 0.01 | 0.31 | 0.87 | — | |
| 50 | — | — | 0.02 | 0.40 | 0.77 | — | |
| 60 | — | — | — | 0.67 | 0.95 | — | |
| 70 | — | — | 0.28 | 0.56 | 0.94 | — | |
| 80 | — | — | — | 1.44 | 2.16 | — | |
| 90 | — | — | 0.34 | 0.89 | 1.80 | — | |
| 96 | — | — | 0.10 | — | 1.10 | — |
*Hydrofluoric acid can also induce internal attack of nickel alloys; these values represent only external attack.
| Alloy | Critical Pitting Temperature in Acidified 6% FeCl3 | Critical Crevice Temperature in Acidified 6% FeCl3 | ||
| °F | °C | °F | °C | |
| 316L | 59 | 15 | 32 | 0 |
| 254SMO | 140 | 60 | 86 | 30 |
| 625 | 212 | 100 | 104 | 40 |
| C-276 | >302 | >150 | 131 | 55 |
| C-22® | >302 | >150 | 176 | 80 |
| Alloy | Time to Cracking |
| 316L | 2 h |
| 254SMO | 24 h |
| 625 | No Cracking in 1,008 h |
| C-276 | No Cracking in 1,008 h |
| C-22® | No Cracking in 1,008 h |
| Alloy | Quiescent | Flowing | ||
| No. of Sites Attacked | Maximum Depth of Attack, mm | No. of Sites Attacked | Maximum Depth of Attack, mm | |
| 316L | A:2, B:2 | A:1.33, B:2.27 | A:2, B:2 | A:0.48, B:0.15 |
| 254SMO | A:2, B:2 | A:0.76, B:1.73 | A:2, B:2 | A:0.01, B:<0.01 |
| 625 | A:1, B:2 | A:0.18, B:0.04 | A:2, B:2 | A:<0.01, B:<0.01 |
| C-276 | A:1, B:1 | A:0.10, B:0.13 | A:0, B:0 | A:0, B:0 |
| C-22® | A:0, B:0 | A:0, B:0 | A:0, B:0 | A:0, B:0 |
Data was generated as part of a U.S. Navy study at the LaQue Laboratories in Wrightsville Beach, North Carolina (and published by D.M. Aylor et al, Paper No. 329, CORROSION 99, NACE International, 1999).
| Chemical | Concentration | Temperature | Corrosion Rate | ||||
| wt. % | °F | °C | Weld Metal | Wrought Base Metal | |||
| mpy | mm/y | mpy | mm/y | ||||
| H2SO4 | 30 | 150 | 66 | 0.6 | 0.02 | 0.4 | 0.01 |
| H2SO4 | 50 | 150 | 66 | 9.3 | 0.24 | 0.8 | 0.02 |
| H2SO4 | 70 | 150 | 66 | 10.3 | 0.26 | 11 | 0.28 |
| H2SO4 | 90 | 150 | 66 | 18.5 | 0.47 | 13.4 | 0.34 |
| HCI | 5 | 100 | 38 | <0.1 | <0.01 | <0.1 | <0.01 |
| HCI | 10 | 100 | 38 | <0.1 | <0.01 | 0.4 | 0.01 |
| HCI | 15 | 100 | 38 | 11.1 | 0.28 | 9.4 | 0.24 |
| HCI | 20 | 100 | 38 | 10.2 | 0.26 | 7.9 | 0.20 |
Hastelloy® C-22 is a low-carbon, Nickel, Chromium, Molybdenum, Tungsten metal alloy. It is primarily known for its corrosion resistance in chemical environments. It has excellent resistance to pitting & crevice corrosion, stress corrosion cracking, & seawater crevice corrosion. When comparing it’s corrosion resistance performance to other Nickel System’s materials, it is one of our top tier corrosion resistant materials.
Other names Include:
Check out our chemical composition breakdown of Hastelloy® C-22:
Examining its chemical composition, Hastelloy® C-22 has very high nickel – chromium – molybdenum content. Notably, its chromium content is significantly higher than Hastelloy® C276. This produces a higher resistance to chloride compounds and makes it a superior choice in extreme chemical environments and industries using chemical processing. Check out a chemical composition comparison between several austenitic stainless steels & other high nickel alloys.
Seawater is perhaps the most common environment which requires corrosive resistant materials and especially fasteners. The U.S. Navy conducted a study on resistance to seawater crevice corrosion (See ASTM G78-20 & D. M. Aylor, R. A. Hays, R. M. Kain, and R. J. Ferrar’s technical paper: “Crevice Corrosion Performance Candidate Naval Ship Seawater Valve Materials in Quiescent and Flowing Natural Seawater,” CORROSION/99 Paper #329, NACE International). They exposed various kinds of alloy metals to static and dynamic seawater. They used eight test samples, four in each context. They performed the test over a 180 day period. Below are some of the results. Most notable is that Hastelloy® C-22 had zero attacks on the crevice locations and showed to be the most resistant in this corrosive, aqueous environment compared to other iron based stainless steels and high nickel alloys.
Pitting and crevice corrosion are major problems in Chloride environments. Hastelloy® C-22 shows incredible resistance to these types of corrosions. The ASTM G48 standard tests metal alloys for their critical pitting and crevice corrosion temperatures. It does this by exposing test samples to a 6 wt. % ferric chloride solution over a 72 hour time period. The tests determines the lowest temperature that causes crevice attack and pitting. The below graph shows the minimum temperature at which each of these austenitic stainless steel & high nickel alloy materials begin to see corrosion. Although both Hastelloy® C276 and C-22 show incredible resistance to pitting with their temperatures being above 302 degrees Fahrenheit, C-22 shows better resistance to crevice corrosion.
A fundamental characteristic of Hastelloy® C-22 is its resistance to stress corrosion cracking caused by chloride and chloride compounds. Below is a chart comparing austenitic stainless steel and high nickel alloys’ performance in resisting stress cracking. In this test, the samples are placed in boiling 45% magnesium chloride (ASTM Standard G 36) and remain in the solution until stress cracking appears or the completion of the test at six weeks (1008 hours). As you can see, high nickel alloys, especially Hastelloy® C-22 pass the test with no stress cracking.
Due to Hastelloy® C-22’s superior strength and resistance in harsh environments, it is widely used across various industries. Below is an overview of key industries that utilize Hastelloy® C-22 and the different types of fasteners employed in each.
The chemical processing industry involves handling highly aggressive chemicals, acids, and extreme temperatures. Equipment such as heat exchangers, reactors, storage tanks, and piping systems require fasteners that can endure constant exposure to corrosive substances.
Aircraft and aerospace components operate in extreme temperatures and require materials that can resist oxidation and thermal cycling. Hastelloy C-22 is used in fuel systems, engine components, and airframe structures where corrosion resistance is critical.
Seawater and marine environments present extreme corrosion challenges due to salt exposure and biofouling. Hastelloy C-22 is a preferred material for offshore oil rigs, shipbuilding, and undersea applications.
Hygiene and contamination prevention are crucial in pharmaceutical and biotech facilities. Fasteners must withstand frequent cleaning with harsh chemicals while maintaining structural integrity.
Facilities such as waste treatment plants, flue gas scrubbers, and pollution control systems handle highly corrosive gases and liquids. Fasteners must resist oxidation and chemical degradation.
Power plants, including nuclear, geothermal, and fossil fuel plants, require materials that can withstand extreme heat, pressure, and corrosive elements.
Nickel Systems Inc. is a trusted stocking supplier of Hastelloy® C-22, offering a reliable inventory of this high-performance corrosion-resistant alloy for a wide range of industrial applications. With a commitment to quality and customer satisfaction, we provide quick turnaround times and competitive pricing to meet your project needs. our experienced team is ready to assist you with expert guidance and tailored solutions for your fastener requirements. Contact us today to start your quotation and let Nickel Systems Inc. be your trusted partner for Hastelloy® C-22 supply!
Does Hastelloy C-22 meet your project requirements? If not, check out some alternatives.
