What is the difference between Hastelloy C4 and C276?
Hastelloy C4
Hastelloy C4 is an iron-based alloy that has good corrosion resistance in both oxidizing and reducing environments. This grade of Hastelloy is often used in chemical processing applications at high temperatures (up to 1300°F). It also has good strength and toughness as well as corrosion resistance.
Hastelloy C276
Hastelloy C276 is an alloy made primarily of nickel and molybdenum, with chromium as the primary addition. The presence of chromium gives this grade of Hastelloy excellent oxidation resistance and superior corrosion resistance. In addition, it has excellent weldability, making it ideal for fabrication projects where welding may be required.
C276 can be used in temperatures ranging from cryogenics (-320°F) to 1800°F. It also exhibits good strength at high temperatures and good ductility in cold working operations such as bending or forming. These properties make it ideal for applications that require high temperature strength, such as turbine blades or exhaust systems.
Differences between Hastelloy C4 and C276
Chemical Composition
The first difference between Hastelloy C4 and C276 is their chemical composition. Hastelloy C4 has less carbon content than C276, which makes it more corrosion resistant in high temperature environments. In addition, C4 has a higher chromium content than C276, which makes it more resistant to oxidation.
Mechanical Properties
The second difference between these two alloys is their mechanical properties. Hastelloy C4 has a higher yield strength than C276, which means it can withstand greater forces before deforming. In addition, C4 has a higher melting point than C276, which means it can withstand higher temperatures before melting.
Manufacturing Methods
The third difference between Hastelloy C4 and C276 is their manufacturing methods. Hastelloy C4 can be manufactured using standard methods such as welding and machining. However, due to its high carbon content, C276 is not suitable for welding and must be machined using special techniques.
Corrosion Resistance
The fourth difference between these two alloys is their corrosion resistance. Both alloys are highly corrosion resistant in most environments. However, Hastelloy C4 is particularly corrosion resistant in high temperature environments, while C276 is more corrosion resistant in acidic environments.
Applications
The absolute difference between these two alloys lies in their applications. Hastelloy C4 is often used in high temperature environments, such as power plants and chemical processing plants. Meanwhile, C276 is often used in the chemical industry and storage tanks due to its excellent corrosion resistance in acidic environments.
