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| Material | UNS | Density in Lb./In3 (G/CM3) | Chemical Composition, % |
|---|---|---|---|
| Inconel 600 | N06600 | 0.304 (8.42) | Nickel 76.0, Fe 8.0, Cr 15.0 |
| Inconel 625 | N06625 | 0.305 (8.44) | Nickel 59.0, Mo 14.2, Cr 20.5, Fe 2.3, W 3.2 |
| Inconel 625LCF | N06626 | 0.315 (8.72) | Nickel 58.0, Mo 16.3, Cr 20.5, Fe 1.0, W 3.8 |
| Inconel 718 | N07718 | 0.296 (8.19) | Nickel 54.0, Cr 18.0, Fe 18.5 |
| Hastelloy C-276 | N10276 | 0.321 | Nickel 57.0, Mo 16.0, Cr 15.5, Si 1.1 |
Difference Between Alloy 625 and C276
Resistance to Pitting
| Material | Pitting | Crevice Corrosion | ||
|---|---|---|---|---|
| °F | °C | °F | °C | |
| Inconel 625 | 212 | 100 | 104 | 40 |
| Hastelloy C276 | >302 | >150 | 131 | 55 |
| Material | Seawater Plus 1 ppm Cl2 | Natural Sea Water | ||
|---|---|---|---|---|
| - | Creviced Sides Attacked (% ) | Max Depth of Attack (mils) | Creviced Sides Attacked (%) | Max Depth of Attack (mils) |
| 316L | 100 | 18 | 100 | 37 |
| Inconel 625 | 100 | 0.8 | 50 | 0.8 |
| Hastelloy C276 | 12 | 0.4 | 0 | 0 |
| Hastelloy C22 | 0 | 0 | 0 | 0 |
Inconel Vs Hastelloy in Seawater
Hastelloy C22 Features and Advantages
Difference Between Hastelloy And Inconel Chemical Composition
| Alloy | Ni | Cr | Fe | Mo | Mn (Max) | Cu | Co (Max) | C (Max) | P (Max) | Si (Max) | S (Max) | Other |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hastelloy C4 | Balance | 18 | 3.0 | 17 | 1.0 | - | 2.0 | 0.01 | 0.02 | 0.08 | 0.01 | Ti 0.7 |
| Hastelloy C22 | Balance | 22 | 3.0 | 13 | 0.5 | - | 2.5 | 0.01 | 0.02 | 0.08 | 0.01 | V 0.3, W 3 |
| Hastelloy C276 | Balance | 17 | 7.0 | 17 | 1.0 | - | 2.5 | 0.01 | 0.02 | 0.08 | 0.01 | V 0.3, W 4.5 |
| Hastelloy B2 | Balance | 1 | 2.0 | 28 | 1.0 | - | 1.0 | 0.01 | 0.02 | 0.1 | 0.01 | - |
| INCONEL 600 | Balance | 16 | 8.0 | - | 1.0 | 0.5 | - | 0.15 | - | 0.5 | 0.01 | - |
| INCONEL 625 | Balance | 23 | 5.0 | 10 | 0.5 | - | 1.0 | 0.10 | 0.01 | 0.5 | 0.01 | Cb 4.1 |
| INCONEL 825 | Balance | 21 | 22.0 | 3 | 1.0 | 2.5 | - | 0.05 | - | 0.5 | 0.03 | - |
Inconel 625 vs Hastelloy C276 Electrochemical Corrosion
| Material | Ecorr | Ep | Ec | Weight Loss | Area of Loop |
|---|---|---|---|---|---|
| - | V | V | V | mg | C |
| Hastelloy C22 | -0.106 | 0.866 | 0.820 | 0.3 | 1.00 |
| Hastelloy C276 | -0.108 | 0.840 | 0.840 | 0.3 | 1.00 |
| Hastelloy C4 | -0.098 | 0.870 | 0.800 | 0.3 | 1.00 |
| INCONEL 625 | -0.058 | 0.908 | 0.870 | 0.6 | 3.00 |
Inconel 625 vs Hastelloy C276 corrosion and wear resistance
Corrosion Data in Boiling Environment
| Media | Corrosion Rate in mpy | ||
|---|---|---|---|
| - | Inconel 625 | Hastelloy C276 | Hastelloy C22 |
| 1% HCl | 1.2 | 21 | 3.2 |
| 2.5% H2SO4 + 5% HNO3 | 724 | 65 | 12 |
| 99% CH3CO2H | 0.4 | 0.4 | 0.4 |
| 65% HNO3 | 20 | 860 | 54 |
| 10% H2SO4 | 26 | 20 | 11 |
| 5% HNO3 + 1% HCl | 1.2 | 8.0 | 0.4 |
| ASTM G-28B(2) | 2,843 | 34 | 7.2 |
| ASTM G-28A(1) | 17 | 322 | 24 |
Hastelloy C276 Specification
| Alloy | Density (g/cm3) | Sheet, Plate & Strip | Bar & Rod | Electrodes | Seamless Pipe and Tube | Welded Pipe & Tube | Fittings (BW/ Forged) | Flange & Forging | DIN |
|---|---|---|---|---|---|---|---|---|---|
| HASTELLOY C22 UNS N06022 |
0.314 lb./in3 (8.69) | ASTM B 575/ ASME SB 575 | ASTM B574, B 472, SB 574 | ENiCrMo-10, SFA 5.11/ A 5.11, DIN 2.4638 |
ASTM B622/ SB 622 | ASTM B619, SB 619, B 626/ SB 626 | ASTM B366/ SB 366, B462/ SB 462 | ASTM B564/ SB 564, B462/ SB 462 | EN 2.4602 17744 NiCr21Mo14W |
| HASTELLOY C276 UNS N10276 |
0.321 lb./in3 (8.89) | ASTM B 575/ ASME SB 575 | ASTM B574, B 472, SB 574 | ENiCrMo-4, SFA 5.11/ A 5.11, DIN 2.4887 |
ASTM B622, B983/ SB 622 | ASTM B619/SB 619, ASTM B626/ SB 62 | ASTM B366/ SB 366, B462/ SB 462 | ASTM B564/ SB 564, B462/ SB 462 | EN 2.4819 17744 NiMo16Cr15W |
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