What is the maximum carbon content in a low carbon nickel alloy?

What is the maximum carbon content in a low carbon nickel alloy?

• A. 0.01%
• B. 0.02%
• C. 0.05%
• D. 0.10%

Answer: (B)

Keeping carbon very low in nickel alloys is about reducing carbide formation at grain boundaries during welding and high-temperature service. Carbides can embrittle the material and reduce corrosion resistance, so lowering carbon helps preserve toughness and weldability. For a low-carbon nickel alloy, the carbon content is limited to about two hundredths of a percent at most. That’s why this option fits the designation. If carbon were allowed to be higher, such as five hundredths of a percent or a tenth of a percent, the material would no longer be categorized as low-carbon, increasing the risk of carbide precipitation and related performance issues.

Keeping carbon very low in nickel alloys is about reducing carbide formation at grain boundaries during welding and high-temperature service. Carbides can embrittle the material and reduce corrosion resistance, so lowering carbon helps preserve toughness and weldability. For a low-carbon nickel alloy, the carbon content is limited to about two hundredths of a percent at most. That’s why this option fits the designation. If carbon were allowed to be higher, such as five hundredths of a percent or a tenth of a percent, the material would no longer be categorized as low-carbon, increasing the risk of carbide precipitation and related performance issues.