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Haynes Hastelloy® C-4 alloy, welded plate 12.7 mm (1/2 in.) thick, aged 1000 hours at 649°C (1200°F)
Categories: Metal; Nonferrous Metal; Nickel Alloy; Superalloy
Material Notes: Nickel-chromium-molybdenum alloy with outstanding high-temperature stability as evidenced by high ductility and corrosion resistance even after aging in the 1200 to 1900°F (649 to 1038°C) range. 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. C-4 alloy also has excellent resistance to stress-corrosion cracking and to oxidizing atmospheres up to 1900°F (1038°C).

HASTELLOY C-4 alloy has exceptional resistance to wide variety of chemical process environments. These include hot contaminated mineral acids, solvents, chlorine and chlorine contaminated media (organic and inorganic), dry chlorine, formic and acetic acids, acetic anhydride, and seawater and brine solutions. Laboratory precipitation studies on C-4 alloy indicate that the intermetallic precipitates (Mu phase) associated with other nickel alloys in the 1200 to 2000°F (649 to 1093°C) temperature range have not been detected. Fine intergranular M6C carbides can form but their damaging effect is minimal.

HASTELLOY C-4 alloy can be forged, hot-upset, and impact extruded. Although the alloy tends to work-harden, it can be successfully deep-drawn, spun, press formed or punched. All of the common methods of welding can be used to weld HASTELLOY C-4 alloy, although the oxy-acetylene and submerged arc processes are not recommended when the fabricated item is intended for use in corrosion service. Special precautions should be taken to avoid excessive heat input.

Wrought forms of HASTELLOY C-4 alloy are furnished in the solution heat-treated condition unless otherwise specified. C-4 alloy is solution heat-treated at 1950°F (1066°C) and rapid quenched.

Data provided by the manufacturer, Haynes International, Inc.
Key Words: UNS N06455; ASME SB-574, ASME SB-575, ASME SB-6119, SB-622 and ASME SB-626
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Physical PropertiesOriginal ValueComments
Density 8.64 g/ccat RT
 
Mechanical PropertiesOriginal ValueComments
Tensile Strength, Ultimate 818 MPa
Tensile Strength, Yield 411 MPa
@Strain 0.2 %
Elongation at Break 46 %in 50.8 mm
Modulus of Elasticity 211 GPaRT
 141 GPa
@Temperature 982 °C
 152 GPa
@Temperature 871 °C
 162 GPa
@Temperature 760 °C
 171 GPa
@Temperature 649 °C
 179 GPa
@Temperature 538 °C
 187 GPa
@Temperature 427 °C
 194 GPa
@Temperature 316 °C
 201 GPa
@Temperature 204 °C
 207 GPa
@Temperature 93.0 °C
 
Electrical PropertiesOriginal ValueComments
Electrical Resistivity 0.000125 ohm-cm
@Temperature 23.0 °C
 0.000125 ohm-cm
@Temperature 100 °C
 0.000126 ohm-cm
@Temperature 200 °C
 0.000127 ohm-cm
@Temperature 300 °C
 0.000128 ohm-cm
@Temperature 400 °C
 0.000129 ohm-cm
@Temperature 500 °C
 0.000132 ohm-cm
@Temperature 600 °C
 
Thermal PropertiesOriginal ValueComments
CTE, linear 10.8 µm/m-°C
@Temperature 20.0 - 93.0 °C
 11.9 µm/m-°C
@Temperature 20.0 - 204 °C
 12.6 µm/m-°C
@Temperature 20.0 - 316 °C
 13.3 µm/m-°C
@Temperature 20.0 - 427 °C
 13.3 µm/m-°C
@Temperature 20.0 - 538 °C
 13.5 µm/m-°C
@Temperature 20.0 - 649 °C
 14.4 µm/m-°C
@Temperature 20.0 - 760 °C
 14.9 µm/m-°C
@Temperature 24.0 - 871 °C
 15.7 µm/m-°C
@Temperature 20.0 - 982 °C
Specific Heat Capacity 0.406 J/g-°C
@Temperature 0.000 °C
 0.427 J/g-°C
@Temperature 100 °C
 0.448 J/g-°C
@Temperature 200 °C
 0.465 J/g-°C
@Temperature 300 °C
 0.477 J/g-°C
@Temperature 400 °C
 0.490 J/g-°C
@Temperature 500 °C
 0.502 J/g-°C
@Temperature 600 °C
Thermal Conductivity 10.1 W/m-K
@Temperature 23.0 °C
 11.4 W/m-K
@Temperature 100 °C
 13.2 W/m-K
@Temperature 200 °C
 15.0 W/m-K
@Temperature 300 °C
 16.7 W/m-K
@Temperature 400 °C
 18.4 W/m-K
@Temperature 500 °C
 20.5 W/m-K
@Temperature 600 °C
 
Component Elements PropertiesOriginal ValueComments
Carbon, C <= 0.010 %
Chromium, Cr 14 - 18 %
Cobalt, Co <= 2.0 %
Iron, Fe <= 3.0 %
Manganese, Mn <= 1.0 %
Molybdenum, Mo 14 - 17 %
Nickel, Ni 58 %As Remainder
Phosphorus, P <= 0.025 %
Silicon, Si <= 0.080 %
Sulfur, S <= 0.010 %
Titanium, Ti <= 0.70 %
 
Descriptive Properties
Average Oxidation Rate per 100-hour test period (mm)0.004at 1038°C
Thermal Diffusivity0.028 cm2/sat 23°C
 0.031 cm2/sat 100°C
 0.033 cm2/sat 200°C
 0.037 cm2/sat 300°C
 0.04 cm2/sat 400°C
 0.043 cm2/sat 500°C
 0.047 cm2/sat 600°C

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