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Hastelloy C276

Hastelloy C276

Nickel (Ni) - 57 Balance
Copper (Cu) - 1.5
Chromium (Cr) - 16.0
Molybdenum (Mo) - 16.0
Iron (Fe) - 5.0
Tungsten (W) - 4.0
Manganese (Mn) - 1.0
Cobalt (Co) - 2.5
Other

Key

Nickel
Copper
Chromium
Aluminum
Molybdenum
Iron
Titanium
Manganese
Cobalt
Other
  • Nickel (Ni) 57 Balance
  • Copper (Cu) 1.5
  • Chromium (Cr) 16.0
  • Molybdenum (Mo) 16.0
  • Iron (Fe) 5.0
  • Tungsten (W) 4.0
  • Manganese (Mn) 1.0
  • Cobalt (Co) 2.5
  • Carbon (C) 0.01 Max
  • Vanadium (V) 0.35 Max
  • Silicon (Si) 0.08 Max

UNS N10276

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.

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Summary

  • Environment:
    Severe Environments: Hot Concentrated Acids & Chemicals
  • Temperature Limit:
    1500 °F / 815 °C
  • Ultimate Tensile (Typical):
    107 ksi / 737.73 mpa

Hastelloy C276 Specifications & Technical Data

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.

Specifications

  • Plate, Sheet & Strip: ASTM B575, ASME SB575
  • Rod & Bar: ASTM B574, ASME SB574
  • Seamless Pipe & Tube: ASTM B622, ASME SB622
  • Welded Pipe & Tube: ASTM B619, ASME SB619
  • Fittings: ASTM B366, ASME SB366
  • Forgings: ASTM B564, ASME SB564
  • Technischer Überwachungsverein (TÜV): Werkstoffblatt 400, Kennblatt 320, Kennblatt 319
  • Others: NACE MR0175, ISO 15156

Physical Properties

Temp 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.

Elevated Temperature Dynamic Modulus Properties
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

 

Physical Constants
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

Mechanical Properties

Typical Room-Temperature Tensile Properties of Annealed Material
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

 

Tensile properties of annealed plate.

C-276 Tensile properties of annealed plate.

Effect of cold work on the yield strength of
annealed plate.

c276 Effect of cold work on the yield strength of annealed plate.

Tensile properties of 33.5% cold-worked tubing.

c276 Tensile properties of 33.5% cold-worked tubing.

 

Corrosion Resistance

Corrosion rates in sulfuric acid.

C267 Corrosion rates in sulfuric acid.

Corrosion rates in oxygen-saturated hydrochloric acid.

C267 Corrosion rates in oxygen-saturated hydrochloric acid.

Corrosion rates in hydrochloric acid.

C267 Corrosion rates in hydrochloric acid.

Corrosion rates in hydrochloric acid + 500 ppm Fe+++

Corrosion resistance in hydrochloric acid. The isocorrosion curves show temperatures and concentrations above which the corrosion rate exceeds 0.5 mm/a (20 mpy).

Corrosion resistance in hydrochloric acid. The isocorrosion curves show temperatures and concentrations above which the corrosion rate exceeds 0.5 mm/a (20 mpy).

Comparative behavior of several nickel base alloys in sulfuric acid. The isocorrosion curves show temperatures and concentrations above which the corrosion rate exceeds 0.5 mm/a (20 mpy).

A summary iso-corrosion chart for 20 mpy (0.51 mm/a) data in hydrofluoric acid.

Corrosion Rates in Acid Solutionsa
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.

Corrosion Rates in Hydrochloric, Phosphoric and Acetic Acidsa
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.

Corrosion Rates in Various Mediaa
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.

ASTM G28 Tests for Intergranular Attack
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.

Flue Gas Desulfurization: Corrosion Ratesa in Simulated FGD Mixed-Gas Condensate Solutions
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.

Oilfield Applications: C-Ring Tests in NACE Solutiona
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.

Heat Treatments

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.

Joining

Recommended Welding Products
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

 

Corrosion Resistance of Weldments in INCONEL alloy C-276
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.

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Hastelloy C276 Fasteners

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Overview of Hastelloy C276

Hastelloy C276, often simply called C276, offers an ideal solution to some of the most challenging industrial problems related to corrosion and material degradation.

What Is C276 Hastelloy?

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.

Is Hastelloy Better Than Stainless Steel?

When compared to stainless steel, Hastelloy C276 generally offers superior performance:

  • Corrosion resistance: While stainless steel is known for its corrosion resistance, Hastelloy C276 outperforms this material in harsher environments, particularly those involving chlorides and acidic conditions.
  • Mechanical properties and durability: C276 also offers superior strength and durability over stainless steels, maintaining its integrity under both oxidative and reductive conditions, and high mechanical stress.

Hastelloy C276 Composition

The chemical makeup of Hastelloy C276 is what provides its robust resistance to corrosion and its mechanical strength. The alloy primarily consists of:

  • Nickel: 57%
  • Molybdenum: 15-17%
  • Chromium: 14.5-16.5%
  • Iron: 4-7%
  • Tungsten: 3-4.5%
  • Cobalt: Up to 2.5%
  • Manganese, vanadium, silicon, carbon, phosphorous and sulfur: Less than 1%

Hastelloy C276 Applications

Hastelloy C276 is used across a broad spectrum of industries due to its remarkable ability to resist corrosion in both oxidizing and reducing environments.

  • Chemical processing: In chemical plants where materials are constantly exposed to highly corrosive substances such as sulfuric acid and hydrochloric acid, alloy C276 is indispensable. It is commonly used in reactors, heat exchangers and pressure vessels, where its resistance to aggressive media helps ensure continuous, safe operations.
  • Oil and gas: The oil and gas industry faces significant corrosion challenges due to exposure to sour gas and seawater. Hastelloy C276 is often used in separators, stack liners, scrubbers and flowlines, where its ability to resist both localized corrosion and stress-corrosion cracking is critical.
  • Power generation: In coal-fired and nuclear power plants, Hastelloy C276 is used in components like steam generators and reactors. The alloy’s resistance to oxidation and its ability to maintain strength at high temperatures make it ideal for these applications.

Hastelloy C276 Fasteners

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:

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Industries We Serve

Nickel Systems provides high quality exotic grade materials that hold up in the toughest, most severe heat and corrosive environments. With our large inventory of specialty fasteners in stock, we are always ready to answer the call to serve the most challenging applications.

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