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C276 Stainless Steel Sheet

C276 stainless steel sheet, more accurately referred to as Alloy C-276 or Hastelloy C276, is a nickel-molybdenum-chromium superalloy with an exceptional resistance to a wide range of severe environments. While commonly confused with stainless steel due to its sheet form and corrosion-resistant properties, C276 is actually a nickel-based alloy, not a traditional stainless steel.

Composition and Properties

Alloy C276 is known for its unique combination of elements that contribute to its superior performance in aggressive conditions:

  • Nickel (Ni): ~57%

  • Molybdenum (Mo): ~15-17%

  • Chromium (Cr): ~14.5-16.5%

  • Iron (Fe): ~4-7%

  • Cobalt (Co): ~2.5% max

  • Tungsten (W): ~3-4.5%

  • Carbon (C): 0.01% max

These elements work synergistically to provide excellent resistance to a wide range of corrosive environments, including strong oxidizers, reducing agents, and even wet chlorine gas.

Key Mechanical Properties

Property Value
Tensile Strength ≥ 690 MPa (100 ksi)
Yield Strength ≥ 283 MPa (41 ksi)
Elongation ≥ 40%
Hardness (Rockwell B) ~ 89

Corrosion Resistance

One of the hallmark features of C276 sheet is its outstanding corrosion resistance, particularly in harsh chemical environments. The alloy resists:

  • Oxidizing and reducing agents

  • Hydrochloric acid and sulfuric acid

  • Chloride-induced pitting and crevice corrosion

  • Stress corrosion cracking

  • Acidic and caustic solutions

This makes it especially suitable for industries where material failure due to corrosion can lead to costly downtime or safety hazards.

Applications of C276 Sheet

Thanks to its durability and resistance, C276 is widely used in critical and high-risk environments:

  1. Chemical Processing
    Used in reactors, heat exchangers, and evaporators due to its resistance to acidic and caustic chemicals.

  2. Pollution Control
    Common in scrubbers, ducting, and stack liners in flue gas desulfurization (FGD) systems.

  3. Marine Industry
    Suitable for use in saltwater environments and offshore platforms.

  4. Pharmaceutical and Food Industries
    Preferred in systems that require high purity and resistance to cleaning agents and sanitizers.

  5. Pulp and Paper Industry
    Used in digesters and bleach plants where corrosive chlorine compounds are present.

Fabrication and Machinability

C276 sheet can be cold-worked and welded using standard techniques. However, due to its high strength and work-hardening rate, it requires careful machining practices. The alloy can be joined using TIG, MIG, and shielded metal arc welding (SMAW), making it versatile in structural applications.

C276 stainless steel sheet, though technically a nickel-based alloy, is a top choice for industries requiring extreme corrosion resistance and durability. Its proven performance in aggressive chemical and high-temperature environments makes it a reliable solution where standard stainless steels would fail.

Whether it’s used in chemical processing, pollution control, or marine engineering, C276 remains a premium material with a strong track record of safety and performance.

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