ASME SB622 HASTELLOY C276 Nickel Alloy Steel Heat Exchanger Tube , Power Plants

ASME SB622 HASTELLOY® C-276 tubes are premium corrosion-resistant components designed for critical heat exchange applications, combining robust mechanical properties with exceptional durability in harsh chemical and thermal environments.

HASTELLOY C276 provides exceptional resistance to a wide range of corrosive substances, including chlorides, acids, alkalis, sulfur compounds, and more. This makes it highly suitable for applications where equipment is exposed to aggressive chemicals, acidic environments, or high-salinity waters.HASTELLOY C276 offers superior resistance to stress corrosion cracking (SCC), which is a key consideration in applications where the material is subjected to both mechanical stress and corrosive environments.

Primary Elements:

• Nickel (Ni): ~57% (balance)

• Chromium (Cr): 14.5–16.5%

• Molybdenum (Mo): 15–17%

• Tungsten (W): 3–4.5%

• Iron (Fe): 4–7%

Impurity Limits:

• Carbon (C): ≤0.01% (minimizes sensitization during welding)

• Silicon (Si): ≤0.08%, Manganese (Mn): ≤1%, Sulfur (S): ≤0.03%

• Cobalt (Co): ≤2.5%, Vanadium (V): ≤0.35%

Corrosion Resistance:

• Excellent in both oxidizing and reducing environments.

• Resists pitting, crevice corrosion, and chloride-induced stress corrosion cracking (SCC).

• Performs well in sulfuric, hydrochloric, and acetic acids, chlorides, and sour gas (H₂S).

Physical and Mechanical Properties:

• Tensile Strength: ~100 ksi (690 MPa).

• Yield Strength: ~45 ksi (310 MPa).

• Elongation: ~45% (excellent ductility).

• Thermal Conductivity: 9.8 W/m·K (at 100°C).

• Coefficient of Thermal Expansion: 12.2 μm/m·K (20–100°C).

• Density: 8.69 g/cm³.

• Non-Magnetic: Suitable for sensitive applications.

Mechanical Properties (Room Temperature):

• Tensile Strength: ≥690 MPa

• Yield Strength (0.2% Offset): ≥283 MPa

• Elongation: ≥40%

Application:

• Corrosion Resistance: HASTELLOY C276 provides exceptional resistance to a wide range of corrosive substances, including chlorides, acids, alkalis, sulfur compounds, and more. This makes it highly suitable for applications where equipment is exposed to aggressive chemicals, acidic environments, or high-salinity waters.
• Heat Exchangers in Semiconductor Manufacturing: In the electronics and semiconductor industries, HASTELLOY C276 heat exchangers are used in chemical vapor deposition (CVD) systems, where corrosive gases and high temperatures are involved. The alloy’s resistance to chemicals used in semiconductor manufacturing processes is crucial for maintaining equipment integrity.
• Chemical Recovery Boilers: HASTELLOY C276 is used in chemical recovery boilers and other systems where exposure to sulfur-rich gases and high temperatures can cause degradation in other materials.
• Offshore Oil and Gas: In offshore oil and gas production, HASTELLOY C276 heat exchanger tubes are used in cooling systems, water treatment, and oil recovery systems, where exposure to aggressive chemicals, sour gases, and high temperatures is common.