Hastelloy C4：Corrosion Resistance Metal Material in Chemical Processing

2024-12-20

Hastelloy C4 (UNS N06455) is a wrought nickel-chromium-molybdenum alloy. It has high corrosion resistance. This alloy is particularly valuable in industries where metal materials are exposed to harsh environments, such as chemical processing, aerospace.

Chemical Composition

The chemical composition of Hastelloy C4 is a critical factor that contributes to its unique properties. The alloy primarily consists of nickel, chromium, and molybdenum, with trace amounts of other elements that enhance its performance.

Element	Content (%)
Chromium, Cr	14-18
Molybdenum, Mo	14-17
Iron, Fe	3 max
Cobalt, Co	2 max
Manganese, Mn	1 max
Titanium, Ti	0.7 max
Silicon, Si	0.08 max
Phosphorus, P	0.04 max
Sulfur, S	0.03 max
Carbon, C	0.015 max
Nickel, Ni	Remainder

Physical Properties

Properties	Metric	Imperial
Density	8.64 g/cm³	0.312 lb/in³
Melting point	1427°C	2600°F

Mechanical Properties

Properties	Metric	Imperial
Tensile strength	738 MPa	107000 psi
Yield strength ( @ 0.2% offset)	492 MPa	71400 psi
Elastic modulus	211 GPa	30600 ksi
Elongation at break (in 50.8 mm)	42%	42%

Thermal Properties

Properties	Metric	Imperial
Thermal expansion co-efficient (@ 20°C/68°F)	10.8 µm/m°C	6 µin/in°F
Thermal conductivity (@ 23°C/73°F)	10.1 W/mK	70.1 BTU in/hr.ft².°F

Heat treatment, working and machining

Recommended working and heat treatment parameters:

Forging: 1177-954 °C
Soft annealing: 1065±14 °C; 30 min; WQ

Forging - alloy can be hot forged within a rather narrow temperature range, starting at 1177°C and finishing at 954°C. Moderate reductions and frequent re-heating are recommended for optimal results. The alloy is sensitive to strain.

Cold working does not reduce the general corrosion resistance, but it can affect resistance to stress corrosion cracking. Post-working annealing is important for best corrosion performance.

Annealing involves heating to 1066°C and water quenching. A hold time at the annealing temperature of 10 to 30 minutes is recommended, with thicker structures requiring the full 30 minutes. Annealing is essential after hot forming operations and any cold forming that results in an outer fiber elongation of 7% or more.

Postweld heat treatment for caustic applications - Heat the material to 705 °C and maintain this temperature for at least 0.5 hours per 25 mm of thickness. Determine the heating and cooling rates based on the shape of the part. For complex shapes with nonuniform thicknesses, use heating and cooling rates of 111 °C per hour. Shapes with uniform thicknesses can employ faster heating and air cooling.

Application

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

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