EDELSTAHL SCHNEIDTECHNIK RHEIN-RUHR

Alloy C-276

Nickel-Molybdenum-Chromium alloy with exceptional corrosion resistance in aggressive chemical environments

Alloy C-276 (also known as Hastelloy C-276) is a nickel-molybdenum-chromium alloy, particularly known for its outstanding corrosion resistance in aggressive chemical environments. It was specifically developed to withstand extremely corrosive conditions, making it a preferred material in the chemical industry, petrochemicals, power generation, and other industries dealing with aggressive media.

Chemical Composition (in %):

Element

Content

Nickel (Ni)

57 – 63 %

Chromium (Cr)

14,5 – 16,5 %

Molybdenum (Mo)

15 – 17 %

Iron (Fe)

up to 6.0 %

Manganese (Mn)

up to 1.0 %

Carbon (C)

up to 0.01 %

Silicon (Si)

up to 0.08 %

Sulfur (S)

up to 0.01 %

Tungsten (W)

up to 4.0 %

Properties:

Corrosion resistance:

  • Alloy C-276 is known for its exceptional corrosion resistance in a wide range of aggressive environments. It is especially resistant to:
  • Acids such as sulfuric, hydrochloric, and phosphoric acid
  • Oxidizing media such as chlorides and chlorine
  • Stress corrosion cracking and pitting corrosion
  • Heavy metal corrosion (e.g., from chlorides and halogen compounds)

Heat resistance:

  • C-276 shows excellent resistance to oxidation at high temperatures. It can be used in environments up to 1,100 °C (2,000 °F) without significant loss of performance.

Strength and toughness:

  • Alloy C-276 maintains good strength and toughness at both high and low temperatures. It retains its strength up to about 1,100 °C (2,000 °F) and is resistant to stress corrosion cracking.

Weldability:

  • The material is easy to weld, suitable for manufacturing and repairing complex components. It can be welded using TIG or MIG, ensuring corrosion resistance in weld seams is preserved.

Resistance to pitting and crevice corrosion:

  • This alloy demonstrates outstanding resistance to pitting and crevice corrosion, particularly in strongly acidic or chloride-containing environments.

Applications:

  • Chemical industry: reactors, kettles, heat exchangers, and pipelines exposed to highly corrosive substances.
  • Petrochemicals: refining oil and gas under aggressive chemicals and high temperatures, including tanks and filters.
  • Pharmaceutical industry: production requiring high hygiene standards and chemical resistance.
  • Power plants: especially in environments with aggressive exhaust gases or wastewater.
  • Aerospace: aircraft engines and components exposed to corrosive atmospheres.
  • Water treatment: desalination plants and degassing systems, resistant to seawater and saltwater corrosion.

Conclusion:

Alloy C-276 (Hastelloy C-276) is one of the best materials for use in the chemical and petrochemical industries, as well as many other fields requiring high chemical resistance, due to its exceptional corrosion resistance in many aggressive environments. With its superior resistance to pitting, crevice corrosion, and oxidation in aggressive media at high temperatures, this material remains a preferred choice for demanding industrial applications.

Note: The information in this datasheet is provided for description purposes only; no liability is assumed!