Q1: What is Alloy C-276 and what makes it unique?
A1: Alloy C-276, also known as Hastelloy C276, is a nickel-molybdenum-chromium alloy with excellent corrosion resistance. Its key feature is outstanding resistance to strong oxidizing and reducing agents, making it one of the most versatile corrosion-resistant materials available. It also contains tungsten, which enhances its resistance to localized corrosion such as pitting and crevice attack.
Q2: In what industries and applications is Alloy C-276 precision pipe commonly used?
A2: Alloy C-276 precision pipe is widely used in chemical processing, pulp and paper production, flue gas scrubbers, air pollution control, marine engineering, and wastewater treatment. It is ideal for handling aggressive chemicals like hydrochloric acid, sulfuric acid, and chlorides.
Q3: What are the temperature and corrosion resistance characteristics of Alloy C-276?
A3: Alloy C-276 offers excellent resistance to a wide range of chemicals and can be used in both oxidizing and reducing environments. It performs well at temperatures up to 1100 °C (2010 °F). It is particularly resistant to pitting, crevice corrosion, and stress-corrosion cracking, even in harsh chloride environments.
Q4: What are the typical mechanical properties of Alloy C-276 precision pipe?
A4: Typical mechanical properties include:
Tensile strength: ~760 MPa
Yield strength (0.2% offset): ~350 MPa
Elongation: ~40%
Hardness: Approx. 90 HRB
These properties give the pipe excellent strength and durability in demanding industrial environments.
Q5: How can Alloy C-276 precision pipes be processed and welded?
A5: Alloy C-276 has good fabricability and can be easily formed and welded using standard welding techniques such as TIG, MIG, and shielded metal arc welding. It does not require post-weld heat treatment, although thorough cleaning after welding is recommended to maintain corrosion resistance. The alloy is typically supplied in solution-annealed condition for optimal performance.
