Hastelloy® C4 (Alloy C-4) Wire UNS N06455

Alloy C-4 is a nickel-chromium-molybdenum alloy with outstanding high temperature stability.

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Forms: Shaped, Flat, Square, Round, Fine Wire, Plated and
Bare Wire

Specifications: ASTM B 575

Hastelloy® C4 Description

Alloy C-4 is a nickel-chromium-molybdenum alloy with outstanding high temperature stability. This alloy resists the formation of grain-boundary precipitates in the weld heat-affected zone, thus making it suitable for most chemical process applications in the as-welded condition. Alloy C-4 alloy also has excellent resistance to stress-corrosion cracking and to oxidizing atmospheres up to 1900°F (1038°C).


Components used in wastewater treatment
Components used in chemical processing
Nuclear fuel processing

Chemistry Typical

Nickel: Balance
Molybdenum: 14.00-17.00
Iron: 3.00 max
Cobalt: 2.00 max
Manganese: 1.00 max
Carbon: 0.015 max
Silicon: 0.08 max
Phosphorus: 0.04 max
Sulfur: 0.03 max
Titanium: 0.70 max

Physical Properties

Density: 0.312 lb/in³, 8.64 g/cm³

Electrical Resistivity: micro-ohm-in, (micro-ohm-m):
At 74°F (23°C): 49.1(1.25)
At 212°F (100°C): 49.3 (1.25)
At 392°F (200°C): 49.6 (1.26)
At 572°F (300°C): 49.9 (1.27)
At 752°F (400°C): 50.2 (1.28)
At 932°F (500°C): 50.8 (1.29)
At 1112°F (600°C): 51.8 (1.32)

Specific Heat: BTU/lb-°F (J/Kg-K)
At 32°F (0°C): 97 (406)
At 212°F (100°C): 102 (427)
At 392°F (200°C): 107 (448)
At 572°F (300°C): 111 (465)
At 752°F (400°C): 114 (477)
At 932°F (400°C): 117 (490)
At 1112°F (500°C): 120 (502)

Thermal Conductivity: BTU-in/hr-ft²-°F (W/m•K)
At 74°F (23°C):70(10.1)
At 212°F (100°C):79 (11.4)
At 392°F (200°C):92 (13.2)
At 572°F (300°C):104 (15.0)
At 752°F (400°C):116 (16.7)
At 932°F (500°C):128 (18.4)
At 1112°F (600°C):142 (20.5)

Mean Coefficient of Thermal Expansion: µin/in-°F, (m/m-K)
68-200°F (20-93°C): 6.0 (10.8 x 10 )
68-400°F (20-204°C): 6.6 (11.9 x 10 )
68-600°F (20-316°C): 7.0 (12.6 x 10 )
68-800°F (20-427°C): 7.2 (13.0 x 10 )
68-1000°F (20-538°C): 7.4 (13.3 x 10 )
68-1200°F (20-649°C): 7.5 (13.5 x 10 )
68-1400°F (20-760°C): 8.0 (14.4 x 10 )
68-1600°F (20-871°C): 8.3 (14.9 x 10 )
68-1800°F (20-982°C): 8.7 (15.7 x 10 )

Modulus of Elasticity: KSI (MPa)
30.8 x 10³(211 x 10³) in tension

Melting Point: 2550°F (1399°C):

Mechanical Properties at Room Temperature

Properties: Annealed Typical

Ultimate Tensile Strength: 100 KSI min (690 MPa min)

Yield Strength: 40 KSI min (276 MPa min)

Elongation: 40% min

Hardness: Rb 100 max (aim)

Properties: Tempered

Alloy C-4can be cold rolled to achieve the temper properties required by specific customers and/or manufacturing requirements. Contact Ulbrich Wire for details.

Additional Properties

Corrosion Resistance

Refer to NACE (National Association of Corrosion Engineers) for recommendations.

Heat Treatment

Alloy C-4 is non-hardenable by heat treatment.


For best results refer to: SSINA’s “Welding of Stainless Steels and Other Joining Methods”.

Hastelloy® C-4 is a registered trademark of Haynes International

Limitation of Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels and Special Metals, Inc., be liable for any damages arising from the use of the information included in this document or that it is suitable for the ‘applications’ noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is
considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. Ulbrich assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.

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