Hastelloy C22 / C276 are nickel-chromium-molybdenum based alloys engineered to provide outstanding resistance to corrosion in extremely aggressive chemical environments. These alloys offer exceptional protection against pitting, crevice corrosion, and stress corrosion cracking, even in the presence of chlorides, oxidizing agents, and strong acids. Hastelloy C22 delivers superior resistance to localized corrosion and enhanced weldability, while Hastelloy C276 is known for its excellent overall corrosion resistance and long-term reliability in both oxidizing and reducing conditions. Hastelloy C22 / C276 maintain high mechanical strength and structural stability across a wide temperature range, making them ideal for chemical processing equipment, reactors, heat exchangers, pollution control systems, oil & gas components, pulp and paper plants, and other critical applications where extreme corrosion resistance and operational durability are essential.
CHEMICAL COMPOSITION OF HASTELLOY C22 / C276 ROUND BAR
Grade
C
Mn
Si
S
Co
Ni
Cr
Fe
Mo
P
C22
0.010 max
0.50 max
0.08 max
0.02 max
2.5 max
Balance
20.0 – 22.5
2.0 – 6.0
12.5 – 14.5
0.02 max
C276
0.01 max
1.0 max
0.08 max
0.03 max
2.5 max
Balance
14.5 – 16.5
4.0 – 7.0
15.0 – 17.0
0.04 max
MECHANICAL PROPERTIES OF HASTELLOY C22 / C276 ROUND BAR
Grade
Tensile Strength (ksi)
0.2% Yield Strength (ksi)
Elongation (%)
Hardness (HRB)
C22
115
55
60
≤ 89
C276
110
52.6
62
—
💡 Practical Difference in Use
Use Hastelloy C22 / C276 Round Bars when: extreme resistance to pitting, crevice corrosion, stress corrosion cracking, and aggressive chemical attack is required across both oxidizing and reducing environments. Hastelloy is a nickel-chromium-molybdenum alloy family designed for severe chemical processing and highly corrosive service conditions.
→ Example: chemical reactors, heat exchangers, scrubbers, pollution control equipment, oil & gas processing systems, and pharmaceutical plants.
Bright Finished / Machined Hastelloy Round Bars when: tight dimensional tolerances, smooth surface finish, and high-precision fabrication are essential for critical components. Bright drawn or machined Hastelloy bars improve machinability and ensure consistent performance in corrosive service.
→ Example: valve stems, precision shafts, fasteners, pump components, and CNC-machined chemical processing parts.
Applications of Hastelloy C22 / C276 Round Bars
Hastelloy round bars are extensively used in industries where maximum corrosion resistance, reliability, and long service life are essential.
Chemical Processing: Reactors, heat exchangers, valves, pumps.
Oil & Gas: Sour gas systems, offshore processing equipment.
Pollution Control: Scrubbers, ducting, flue gas systems.
When to Choose Hastelloy C22 / C276 Round Bars?
The selection depends on corrosion severity, operating temperature, fabrication requirements, and service life expectations.
Choose Hastelloy Round Bars when:
Resistance to severe chemical corrosion is critical
Protection against pitting and crevice corrosion is required
Components operate in mixed oxidizing and reducing media
Resistance to stress corrosion cracking is essential
Long-term reliability in aggressive environments is needed
Used in chemical, oil & gas, and pollution control industries
Bright / Machined Hastelloy Round Bars are preferred when:
High dimensional accuracy is required
Smooth surface finish is essential
Precision machining or threading is involved
Uniform mechanical properties are necessary
Used in valves, fasteners, and pump assemblies
Applied in critical chemical processing systems
Industries That Use Hastelloy C22 / C276 Round Bars
Hastelloy alloys are widely used in extreme service environments requiring superior corrosion resistance and operational reliability.
Chemical Processing Industry
Used in highly aggressive chemical environments.
Uses
Reactors, heat exchangers, valves.
Why Hastelloy?
Exceptional resistance to acids, chlorides, and oxidizers.
Oil & Gas Industry
Used in sour gas and offshore processing systems.
Uses
Processing equipment, fasteners.
Why Hastelloy?
Superior corrosion resistance in harsh hydrocarbon environments.
Pollution Control & Power
Used in high-temperature corrosive exhaust systems.
Uses
Scrubbers, ducting, flue gas components.
Why Hastelloy?
Long service life under extreme chemical and thermal exposure.
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