A detailed explanation of Hastelloy C22 and C276 fasteners?
A detailed explanation of Hastelloy C22 and C276 fasteners?
Hastelloy C22 and C276 fasteners are high-performance nickel-chromium-molybdenum alloys widely used for their excellent corrosion resistance in harsh environments. While similar, their differing chemical compositions make each better suited to specific conditions: C22 performs exceptionally well in oxidizing environments, while C276 is best suited for reducing environments.
What is Hastelloy C276?
Hastelloy C-276 is a nickel-molybdenum-chromium-tungsten alloy that exhibits excellent overall corrosion resistance and good machinability.
What are Hastelloy C22 and C276 fasteners?
Hastelloy C22 fasteners (UNS N06022) are nickel-chromium-molybdenum-tungsten alloy components designed to resist both oxidizing and reducing environments. They perform exceptionally well under highly corrosive conditions. Similarly, Hastelloy C276 fasteners (UNS N10276) are another nickel-based alloy composed of nickel, chromium, molybdenum, and tungsten, capable of withstanding a wide range of corrosive media, exhibiting excellent corrosion resistance, especially in oxidizing environments.
C22/C276 Hastelloy Fasteners Equivalent Grades
| STANDARD | UNS | WNR. | EN | JIS | GOST | OR |
|---|---|---|---|---|---|---|
| Hastelloy C22 | N06022 | 2.4602 | NiCr21Mo14W | NW 6022 | - | - |
| Hastelloy C276 | N10276 | 2.4819 | NiMo16Cr15W | NW 0276 | ХН65МВУ | ЭП760 |
Chemical Composition of Hastelloy C22/C276 Fasteners
| Grade | Ni | C | Mo | Mn | Si | Fe | P | S | Co | Cr | W | V |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hastelloy C22 | 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 | 2.5-3.5 | 0.35 max |
| Hastelloy C276 | Balance | 0.01 max | 15–17 | 1.0 max | 0.08 max | 4–7 | 0.04 max | 0.03 max | 2.5 max | 14.5–16.5 | 3–4.5 | 0.35 max |
Mechanical Properties Of Hastelloy C22/C276 Bolts & Nuts
| Grade | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
|---|---|---|---|---|---|
| Hastelloy C22 | 8.69 g/cm3 | 1399 °C (2550 °F) | Psi – 1,00,000, MPa – 690 | Psi – 45000, MPa – 310 | 45 % |
| Hastelloy C276 | 8.89 g/cm3 | 1370 °C (2500 °F) | Psi – 1,15,000 , MPa – 790 | Psi – 52,000 , MPa – 355 | 40 % |
Physical Properties of Hastelloy C22 Fasteners
| Density | 0.314 lb/in3 |
|---|---|
| Specific Gravity | 8.69 lb/in3 |
| Specific Heat (Btu/lb/Deg F - [32-212 Deg F] | 0.1 |
| Melting Point (Deg F) | 2550 |
| Thermal Conductivity | 70 |
| Mean Coeff Thermal Expansion | 6.9 |
| Modulus of Elasticity Tension | 29.9 |
Physical Properties of Hastelloy C276 Fasteners
| Physical Property | Temp., °F | British Units | Temp., °C | Metric Units |
|---|---|---|---|---|
| Density | 72 | 0.321 lb/in.3 | 22 | 8.89 g/cm.3 |
| Melting Range | 2415-2500 | 1323-1371 | ||
| Electrical Resistivity | 75 | 51 microhm-in. | 24 | 1.30 microhm-m |
| Mean Coefficient of Thermal Expansion |
75-200 | 6.2 microinches/in.-°F | 24-93 | 11.2 x 10-6 m/m•K |
| 75-400 | 6.7 microinches/in.-°F | 24-204 | 12.0 x 10-6 m/m•K | |
| 75-600 | 7.1 microinches/in.-°F | 24-316 | 12.8 x 10-6 m/m•K | |
| 75-800 | 7.3 microinches/in.-°F | 24-427 | 13.2 x 10-6 m/m•K | |
| 75-1000 | 7.4 microinches/in.-°F | 24-538 | 13.4 x 10-6 m/m•K | |
| Thermal Conductivity | -270 | 50 Btu-in./ft.2 hr.-°F | -168 | 7.2 W/m•K |
| -100 | 60 Btu-in./ft.2 hr.-°F | -73 | 8.6 W/m•K | |
| 0 | 65 Btu-in./ft.2 hr.-°F | -18 | 9.4 W/m•K | |
| 100 | 71 Btu-in./ft.2 hr.-°F | 38 | 10.2 W/m•K | |
| 200 | 77 Btu-in./ft.2 hr.-°F | 93 | 11.1 W/m•K | |
| 400 | 90 Btu-in./ft.2 hr.-°F | 204 | 13.0 W/m•K | |
| 600 | 104 Btu-in./ft.2 hr.-°F | 316 | 15.0 W/m•K | |
| 800 | 117 Btu-in./ft.2 hr.-°F | 427 | 16.9 W/m•K | |
| 1000 | 132 Btu-in./ft.2 hr.-°F | 538 | 19.0 W/m•K | |
| Specific Heat (Calculated) |
Room | 0.102 Btu/lb.-°F | Room | 427 J/kg•K |
Dimensions Of Hastelloy C22/C276 Fasteners
| Nominal Size or Basic Product Diameter |
Full-Size Body Diameter, E |
Width Across Flats, F |
Width Across Corners, G |
Head Height, H Basic | Radius of Fillet, R |
Nominal Thread Length for Bolt Lengths, LT |
|||||||||
| inch | mm | Max | Min | Basic inch |
Max | Min | Max | Min | Basic inch |
Max | Min | Max | Min | 6 in. and Shoter |
Over 6 in. |
| 1⁄4 | 0.25 | 0.26 | 0.237 | 7⁄16 | 0.438 | 0.425 | 0.505 | 0.484 | 11⁄64 | 0.188 | 0.15 | 0.03 | 0.01 | 0.75 | 1 |
| 5⁄16 | 0.3125 | 0.324 | 0.298 | 1⁄2 | 0.5 | 0.484 | 0.577 | 0.552 | 7⁄32 | 0.235 | 0.195 | 0.03 | 0.01 | 0.875 | 1.125 |
| 3⁄8 | 0.375 | 0.388 | 0.36 | 9⁄16 | 0.562 | 0.544 | 0.65 | 0.62 | 1⁄4 | 0.268 | 0.226 | 0.03 | 0.01 | 1 | 1.25 |
| 7⁄16 | 0.4375 | 0.452 | 0.421 | 5⁄8 | 0.625 | 0.603 | 0.722 | 0.687 | 19⁄64 | 0.316 | 0.272 | 0.03 | 0.01 | 1.125 | 1.375 |
| 1⁄2 | 0.5 | 0.515 | 0.482 | 3⁄4 | 0.75 | 0.725 | 0.866 | 0.826 | 11⁄32 | 0.364 | 0.302 | 0.03 | 0.01 | 1.25 | 1.5 |
| 5⁄8 | 0.625 | 0.642 | 0.605 | 15⁄16 | 0.938 | 0.906 | 1.083 | 1.033 | 27⁄64 | 0.444 | 0.378 | 0.06 | 0.02 | 1.5 | 1.75 |
| 3⁄4 | 0.75 | 0.768 | 0.729 | 11⁄8 | 1.125 | 1.088 | 1.299 | 1.24 | 1⁄2 | 0.524 | 0.455 | 0.06 | 0.02 | 1.75 | 2 |
| 7⁄8 | 0.875 | 0.895 | 0.852 | 1 5⁄16 | 1.312 | 1.269 | 1.516 | 1.447 | 37⁄64 | 0.604 | 0.531 | 0.06 | 0.02 | 2 | 2.25 |
| 1 | 1 | 1.022 | 0.976 | 1 1⁄2 | 1.5 | 1.45 | 1.732 | 1.653 | 43⁄64 | 0.7 | 0.591 | 0.09 | 0.03 | 2.25 | 2.5 |
| 1 1⁄8 | 1.125 | 1.149 | 1.098 | 1 11⁄16 | 1.688 | 1.631 | 1.949 | 1.859 | 3⁄4 | 0.78 | 0.658 | 0.09 | 0.03 | 2.5 | 2.75 |
| 1 1⁄4 | 1.25 | 1.277 | 1.223 | 1 7⁄8 | 1.875 | 1.812 | 2.165 | 2.066 | 27⁄32 | 0.876 | 0.749 | 0.09 | 0.03 | 2.75 | 3 |
| 1 3⁄8 | 1.375 | 1.404 | 1.345 | 2 1⁄16 | 2.062 | 1.994 | 2.382 | 2.273 | 29⁄32 | 0.94 | 0.81 | 0.09 | 0.03 | 3 | 3.25 |
| 1 1⁄2 | 1.5 | 1.531 | 1.47 | 2 1⁄4 | 2.25 | 2.175 | 2.598 | 2.48 | 1 | 1.036 | 0.902 | 0.09 | 0.03 | 3.25 | 3.5 |
| 1 5⁄8 | 1.625 | 1.658 | 1.591 | 2 7⁄16 | 2.438 | 2.356 | 2.815 | 2.616 | 1 3⁄32 | 1.116 | 0.978 | 0.09 | 0.03 | 3.5 | 3.75 |
| 1 3⁄4 | 1.75 | 1.785 | 1.716 | 2 5⁄8 | 2.625 | 2.538 | 3.031 | 2.893 | 1 5⁄32 | 1.196 | 1.054 | 0.12 | 0.04 | 3.75 | 4 |
| 1 7⁄8 | 1.875 | 1.912 | 1.839 | 2 13⁄16 | 2.812 | 2.719 | 3.248 | 3.099 | 1 1⁄4 | 1.276 | 1.13 | 0.12 | 0.04 | 4 | 4.25 |
| 2 | 2 | 2.039 | 1.964 | 3 | 3 | 2.9 | 3.464 | 3.306 | 1 11⁄32 | 1.388 | 1.175 | 0.12 | 0.04 | 4.25 | 4.5 |
| 2 1⁄4 | 2.25 | 2.305 | 2.214 | 3 3⁄8 | 3.375 | 3.262 | 3.897 | 3.719 | 1 1⁄2 | 1.548 | 1.327 | 0.19 | 0.06 | 4.75 | 5 |
| 2 1⁄2 | 2.5 | 2.559 | 2.461 | 3 3⁄4 | 3.75 | 3.625 | 4.33 | 4.133 | 1 21⁄32 | 1.708 | 1.479 | 0.19 | 0.06 | 5.25 | 5.5 |
| 2 3⁄4 | 2.75 | 2.827 | 2.711 | 4 1⁄8 | 4.125 | 3.988 | 4.763 | 4.546 | 1 13⁄16 | 1.869 | 1.632 | 0.19 | 0.06 | 5.75 | 6 |
| 3 | 3 | 3.081 | 2.961 | 4 1⁄2 | 4.5 | 4.35 | 5.196 | 4.959 | 2 | 2.06 | 1.815 | 0.19 | 0.06 | 6.25 | 6.5 |
| 3 1⁄4 | 3.25 | 3.335 | 3.21 | 4 7⁄8 | 4.875 | 4.712 | 5.629 | 5.372 | 2 3⁄16 | 2.251 | 1.936 | 0.19 | 0.06 | 6.75 | 7 |
| 3 1⁄2 | 3.5 | 3.589 | 3.461 | 5 1⁄4 | 5.25 | 5.075 | 6.062 | 5.786 | 2 5⁄16 | 2.38 | 2.057 | 0.19 | 0.06 | 7.25 | 7.5 |
| 3 3⁄4 | 3.75 | 3.858 | 3.726 | 5 5⁄8 | 5.625 | 5.437 | 6.495 | 6.198 | 2 1⁄2 | 2.572 | 2.241 | 0.19 | 0.06 | 7.75 | 8 |
| 4 | 4 | 4.111 | 3.975 | 6 | 6 | 5.8 | 6.928 | 6.612 | 2 11⁄16 | 2.764 | 2.424 | 0.19 | 0.06 | 8.25 | 8.5 |
Hastelloy C22 and C276 Fasteners: Main Characteristics and Applications
Hastelloy C22 Fasteners
Characteristics: C22 contains more chromium, enhancing its ability to form a stable passive layer, resulting in excellent corrosion resistance to strong oxidizing agents such as wet chlorine, ferric chloride, and cupric chloride, as well as mixtures of nitric acid and chloride ions. It also exhibits better resistance to localized corrosion, such as pitting, crevice corrosion, and stress corrosion cracking.
Applications: Suitable for multi-purpose plants in the chemical and pharmaceutical industries where operating conditions may fluctuate between oxidizing and reducing environments, and product purity is critical. Common uses include herbicide production equipment, high-level radioactive waste treatment, and processes involving high-temperature contaminated organic and inorganic acids.
Hastelloy C276 Fasteners
Characteristics: C276 contains higher molybdenum and tungsten content, making it highly effective in strongly reducing environments, such as those involving hydrochloric acid, sulfuric acid, and acid gases. It is a versatile and reliable alloy suitable for a wide range of demanding industrial conditions and performs well at elevated temperatures.
Applications: Widely used in the oil and gas industry (for tubing and casing in sour wells), pollution control (flue gas desulfurization systems), and chemical processing (reactors, heat exchangers). Its reliability and performance make it suitable for applications requiring a single material to handle multiple corrosive chemicals.
Gnee Steel is a professional manufacturer of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power, automotive, and nuclear energy industries, and we can provide customized alloy material solutions according to customer needs. For alloy material price inquiries or to request customized alloy material solutions, please feel free to contact us at ru@gneesteelgroup.com for a quote.