Whether you are an engineer, a materials scientist or a procurement manager, understanding the benefits and applications of Hastelloy C276 fasteners can significantly impact the success and longevity of your projects. Hastelloy C276 is a nickel-chromium-molybdenum alloy renowned for its exceptional resistance to corrosion. It is a critical component in industries where materials are regularly exposed to extreme chemical, thermal and mechanical stresses.
Nickel Systems is a leading provider of Hastelloy C276 fasteners, delivering high-quality products tailored to your specific operational requirements.
Hastelloy C276’s success in demanding industrial applications is largely due to its unique characteristics. If your question isn’t answered below, download the technical data sheet here.
Chemical Composition |
|
| Element | Percent Composition |
| Nickel (Ni) | Balance |
| Molybdenum (Mo) | 15% – 17% |
| Chromium (Cr) | 14.5% – 16.5% |
| Iron (Fe) | 4% – 7% |
| Tungsten (W) | 3% – 4.5% |
| Cobalt (Co) | 2.5% |
| Manganese (Mn) | 1% |
| Silicon (Si) | 0.08% |
| Phosphorus (P) | ≤0.04% |
| Sulfur (S) | ≤0.03% |
| Carbon (C) | ≤0.010% |
Physical Properties |
||||
| Temperature | Thermal Conductivity | Coeff. of Expansiona | Electrical Resistivity | Young’s Modulus |
|---|---|---|---|---|
| °F | Btu•in./ft2•h°F | 10-6 in/in•°F | ohm•cmil/ft | 103 ksi |
| -270 | 50 | — | — | — |
| -100 | 60 | — | 0 | — |
| 0 | 65 | — | — | — |
| 77 | — | — | 739.2 | 29.8 |
| 100 | 71 | — | — | — |
| 200 | 77 | 6.8 | 734.8 | 29.5 |
| 400 | 90 | 7.0 | 749.3 | 28.6 |
| 600 | 104 | 7.2 | 757.7 | 27.8 |
| 800 | 117 | 7.4 | 760.3 | 26.7 |
| 1000 | 132 | 7.5 | 772.5 | 25.7 |
| 1200 | 145 | 7.7 | 781.5 | 24.8 |
| 1400 | 159 | 8.1 | 773.9 | 23.5 |
| 1600 | 173 | 8.5 | 768.3 | 22.0 |
| 1800 | 185 | — | 766.2 | 20.6 |
| 2000 | 195 | — | 757.7 | 19.1 |
| °C | W/m•°C | µm/m•°C | µΩ•cm | GPa |
| -168 | 7.2 | — | — | — |
| -73 | 8.7 | — | — | — |
| 20 | 69.8 | — | — | — |
| 25 | — | — | 122.9 | 205 |
| 100 | 11.2 | 12.2 | 123.7 | 203 |
| 200 | 12.8 | 12.4 | 124.5 | 198 |
| 300 | 14.7 | 12.9 | 125.7 | 192 |
| 400 | 116.4 | 13.2 | 126.0 | 186 |
| 500 | 18.2 | 13.5 | 127.7 | 180 |
| 600 | 20.0 | 13.6 | 129.9 | 178 |
| 700 | 21.9 | 14.1 | 129.7 | 167 |
| 800 | 23.7 | 14.8 | 128.2 | 159 |
| 900 | 25.4 | — | 127.4 | 150 |
| 1000 | 27.0 | — | 127.1 | 141 |
| 1100 | 28.3 | — | — | — |
aMean coefficient of linear expansion between 77°F (25°C) and temperature shown.
| Temp. | Young’s Modulus | Shear Modulus | Poisson’s Ration |
|---|---|---|---|
| °F | 103 ksi | 103 ksi | |
| 70 | 31.30 | 11.81 | 0.33 |
| 100 | 31.18 | 11.75 | 0.33 |
| 200 | 30.77 | 11.57 | 0.33 |
| 300 | 30.35 | 11.40 | 0.33 |
| 400 | 29.92 | 11.23 | 0.33 |
| 500 | 29.42 | 11.05 | 0.33 |
| Density | lb/in3 | 0.321 |
|---|---|---|
| g/cm3 | 8.89 | |
| Melting Range | °F | 2,415 – 2,500 |
| °C | 1,325 – 1,370 | |
| Thermal Conductivity | Btu•in./ft2•h°F | 67.9 |
| W/m•°C | 9.8 | |
| Specific Heat | Btu•lb•°F | 0.102 |
| J/kg•°C | 427 | |
| Young’s Modulus | 103 ksi | 29.8 |
| GPa | 205 | |
| Shear Modulus | 103 ksi | 11.4 |
| GPa | 79 | |
| Permeability at 200 oersted (15.9 kA/m) | 1.0002 | |
| Poisson’s Ratio | 0.307 | |
| Product Form | Tensile Strength | Yield Strength (0.2% Offset) | Elongation | Hardness | ||
|---|---|---|---|---|---|---|
| ksi | MPa | ksi | MPa | % | Rb | |
| Tubing | 105.4 | 727 | 45.4 | 313 | 70 | 92 |
| Plate | 107.4 | 741 | 50.3 | 347 | 67 | 89 |
| Bar | 110.0 | 758 | 52.6 | 363 | 62 | 88 |
| Sheet | 115.5 | 796 | 54.6 | 376 | 60 | 86 |
| Solution | Temperature | Corrosion Rate, mpy (mm/a) | ||||
|---|---|---|---|---|---|---|
| °F | °C | Alloy C-276 | Alloy 22 | Alloy 625 | Alloy 686 | |
| 10% H2SO4 | Boiling | Boiling | 20 (0.51) | 22 (0.56) | 17 (0.43) | 3 (0.08) |
| 20% H2SO4 | 176 | 80 | 3 (0.08) | 1 (0.03) | 1 (0.03) | — |
| 40% H2SO4 | 176 | 80 | 5 (0.13) | 10 (0.25) | 5 (0.13) | — |
| 80% H2SO4 | 176 | 80 | 4 (0.10) | 9 (0.23) | 6 (0.15) | 4 (0.10) |
| 95% H2SO4 | 122 | 50 | 0.1 (0.003) | — | 48 (1.2) | — |
| 5% H2SO4 + 0.1% HCl | Boiling | Boiling | 22 (0.56) | 24 (0.61) | — | — |
| 10% H2SO4 + 1% HCl | Boiling | Boiling | 70 (1.78) | 201 (5.11) | 465 (11.68) | — |
| 10% H2SO4 + 2% HCl | Boiling | Boiling | 138 (3.51) | 281 (7.14) | — | 132 (3.35) |
| 10% H2SO4 + 2% HCl | 122 | 50 | 0.2 (0.005) | 0.1 (0.003) | 0.1 (0.003) | 0 (0) |
| 10% H2SO4 + 5% HCl | Boiling | Boiling | 256 (6.50) | 456 (11.58) | — | — |
| 40% H2SO4 + 10% HCl | 176 | 80 | 26 (0.66) | 32 (0.81) | — | — |
| 2% HCl | Boiling | Boiling | 43 (1.09) | 52 (1.32) | — | 6 (0.15) |
| 5% HCl | 140 | 60 | 10 (0.25) | — | 46 (1.17) | 1.2 (0.30) |
| 20% HCl | 212 | 100 | 154 (3.91) | 269 (6.83) | 385 (9.78) | — |
| 5% HCl + 2% HF | 158 | 70 | 18 (0.46) | 40 (1.02) | 102 (2.59) | — |
| 85% H3PO4 | Boiling | Boiling | 10 (0.25) | 13 (0.33) | >180 (>4.57) | 16 (0.41) |
| 10% HNO3+ 3% HF | Boiling | Boiling | 95 (2.41) | 23 (0.61) | 28 (0.71) | — |
a168 h tests.
| Solution | Temperature | Corrosion Rate, mpy (mm/a) | |||||
|---|---|---|---|---|---|---|---|
| °F | °C | Alloy C-276 | Alloy 26-6MO | Alloy 27-7MO | Alloy 22 | Alloy 686 | |
| 0.2% HCl | Boiling | Boiling | 0.60 (0.02) | <0.1 (<0.003) | 1.3 (0.03) | <0.1 (<0.003) | 0.20 (0.005) |
| 1% HCl | Boiling | Boiling | 6.5 (0.17) | 119 (3.02) | <0.1 (<0.003) | 2.7 (0.07) | 2.0 (0.05) |
| 194 | 90 | 3.5 (0.09) | 37.0 (0.94) | <0.1 (<0.003) | — | — | |
| 158 | 70 | 0.74 (0.02) | 0.02 (<0.001) | <0.1 (<0.003) | — | — | |
| 5% HCl | 158 | 70 | 13.2 (0.34) | 142 (3.61) | 150 (3.8) | 18.8 (0.48) | 9.8 (0.25) |
| 122 | 50 | 0.5 (0.01) | 43.4 (1.10) | 5 (0.13) | 1 (0.03) | 0 (0) | |
| 85% H3PO4 | Boiling | Boiling | 10.4 (0.26) | 114 (2.90) | 27 (0.69) | 13.0 (0.33) | 16.2 (0.41) |
| 194 | 90 | 0.20 (0.005) | 10.6 (0.27) | <0.1 (<0.003) | 0.21 (0.005) | 0.18 (0.005) | |
| 80% CH3COOH | Boiling | Boiling | 0.15 (0.004) | <0.1 (<0.003) | <1 (<0.03) | <0.1 (<0.003) | <0.1 (<0.003) |
a192 h tests.
| Solution | Temperature | Corrosion Rate | ||
|---|---|---|---|---|
| °F | °C | mpy | mm/a | |
| 10% HNO3 | Boiling | Boiling | 15b | 0.38b |
| 10% HNO3+ 2% HCl | 180 | 82 | 6.5 | 0.17 |
| 15% HNO3+ 3% HF | 140 | 60 | 179 | 4.55 |
| 20% HNO3+ 2% HF | 140 | 60 | 215 | 5.46 |
| 3% HF | 176 | 80 | 53 | 1.35 |
| 10% HF | 75 | 24 | 2 | 0.05 |
| 10% HF | 176 | 80 | 28 | 0.71 |
| Concentrated HF | 75 | 24 | 1 | 0.03 |
| Concentrated HF | 176 | 80 | 34 | 0.86 |
| 20% H3PO4 | Boiling | Boiling | <1 | <0.03 |
| 60% H3PO4 | Boiling | Boiling | 1 | 0.03 |
| 85% H3PO4 | 212 | 100 | <1 | <0.03 |
| 20% H3PO4 | Boiling | Boiling | 10 | 0.25 |
| 99.9% CH3COOH + 0.1% NaCl | Boiling | Boiling | <1 | <0.03 |
| 50% NaOH | Boiling | Boiling | 1 | 0.03 |
| 10% HBr | 176 | 80 | <1 | <0.03 |
| 10% HBr | Boiling | Boiling | <1 | <0.03 |
| 10% NH3Br | 176 | 80 | 0 | 0.00 |
| 10% NH3Br | Boiling | Boiling | 0 | 0.00 |
aTest duration of 168 h except as noted. bTest duration of 24 h.
| Alloy | Method Aa Corrosion Rate | Method Bb Corrosion Rate | ||
|---|---|---|---|---|
| mpy | mm/a | mpy | mm/a | |
| INCONEL C-276 | 175 | 4.45 | 30 | 0.76 |
aBoiling ferric sulfate/50% sulfuric acid. bBoiling 23% H2SO4+ 1.2% HCl + 1% FeCl3+ 1% CuCl2.
| Solution | Temperature | Corrosion Rate, mpy (mm/a) | |||
|---|---|---|---|---|---|
| °F | °C | Alloy C-276 | Alloy 22 | Alloy 625 | |
| 60% H2SO4+ 0.5% HCl + 0.1% HF + 0.1% HNO3 | 185 | 85 | 82 (2.08) | 20 (0.51) | 14 (0.36) |
| 60% H2SO4+ 2.5% HCl + 0.2% HF + 0.5% fly ash | 176 | 80 | 42 (1.07) | 50 (1.27) | 126 (3.20) |
a168 h test.
| Material Condition | Simulated Well Age | Yield Strength (0.2% Offset) |
Hardness, Rockwell C |
Duration, Days |
Sulfide Stress Cracking |
|
|---|---|---|---|---|---|---|
| ksi | MPa | |||||
| Cold Worked | 600°F (315°C)/1000 h | 126.6 | 873 | 32 | 43 | No |
| Cold Worked | 600°F (315°C)/1000 h | 155.1 | 1069 | 38 | 43 | No |
| Cold Worked | 600°F (315°C)/1000 h | 166.8 | 1150 | 35 | 43 | No |
| Cold Worked | 600°F (315°C)/1000 h | 188.7 | 1301 | 43 | 43 | No |
aRoom-temperature tests at 100% of yield strength in 5% NaCl plus 0.5% acetic acid saturated with H2S. All specimens were coupled to carbon steel.
Hot forming should be between 1600 and 2250°F (870 and 1230°C), with all heavy forming above 2000°F (1090°C).
INCONEL alloy C-276 is normally annealed at 2100-2150°F (1150-1175°C) and rapidly cooled such as by water quenching.
| Shielded Metal Arc Welding | Gas Tungsten Arc Welding, Gas Metal Arc Welding |
|---|---|
| INCONEL welding electrode C-276 | INCONEL filler metal C-276 |
| INCO-WELD welding electrode 686CPT | INCO-WELD filler metal 686CPT |
| Environment | Base Metal Alloy (5-6 mm thickness) | Weld Filler Metal | Maximum Pitting Depth of Attack, mm Average Results for Duplicate Specimens |
|||
|---|---|---|---|---|---|---|
| GTAW Process | GMAW Pulsed Process | |||||
| Base Metal | Weld Metal | Base Metal | Weld Metal | |||
| Green Death* | INCONEL alloy C-276 | INCONEL filler metal C-276 | 0 | 6.2 | 0 | 3.4 |
| INCONEL alloy C-276 | INCO-WELD filler metal 686CPT | 0 | 0 | 0 | 0 | |
| ASTM G48C | INCONEL alloy C-276 | INCONEL filler metal C-276 | 0 | 0 | 0 | 0 |
| INCONEL alloy C-276 | INCO-WELD filler metal 686CPT | 0 | 0 | 0 | 0 | |
*11.9% H2SO4 + 1.3% HCl + 1% FeCl3 + 1% CuCl2 boiling at 103°C for 72 h.
Hastelloy C276, often simply called C276, offers an ideal solution to some of the most challenging industrial problems related to corrosion and material degradation.
Hastelloy® C276 is an extremely versatile material that has found usage in a wide variety of severe environments. It has shown corrosion resistance to chloride-containing media, organic acids, oxidizing media, reducing acids, seawater and brine and sulfuric flue gases.
Hastelloy® C276 replaced Alloy C (UNS N10002), which contained slightly less chromium and molybdenum. The high nickel, molybdenum and tungsten content make it expensive when compared to austenitic stainless. By far, it is the most popular Super Alloy.
The alloy’s unique composition allows it to resist pitting, crevice corrosion and stress-corrosion cracking — common issues that can severely compromise other materials. Its versatility and durability make alloy C276 crucial in industries ranging from chemical processing to pollution control.
When compared to stainless steel, Hastelloy® C276 generally offers superior performance:
The chemical makeup of Hastelloy® C276 is what provides its robust resistance to corrosion and its mechanical strength. The alloy primarily consists of the following chemical composition range as defined in ASTM B574 specification:
Please note that this composition follows ASTM material specifications for Alloy N10276 or UNS N10276. Some trademarked alloys chemical compositions may vary slightly within the UNS number range of composition. If you require a specific composition, fastener specification or trademarked alloy, please specify it at the time of quotation. If not specified, our material will conform within the ASTM – UNS chemical composition range.
Hastelloy C276 is used across a broad spectrum of industries due to its remarkable ability to resist corrosion in both oxidizing and reducing environments.
Durable Hastelloy C276 fasteners are essential for maintaining the integrity of structures and equipment exposed to corrosive environments. We have various types of these fasteners available at Nickel Systems, including:
Nickel Systems Inc. is a trusted stocking supplier of Hastelloy C-276, 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-276 supply!
