What is another name for carbon steel pipe that has not been galvanized?

What is another name for carbon steel pipe that has not been galvanized?

• A. Black pipe
• B. White pipe
• C. Blue pipe
• D. Grey pipe

Answer: (A)

Ungalvanized carbon steel pipe is commonly known as black pipe. The name comes from its dark, oxide-coated surface left from the manufacturing process before any zinc coating is applied. Because it isn’t galvanized, it isn’t treated with zinc for corrosion resistance, so it’s more prone to rust when exposed to moisture unless it’s painted or otherwise protected. Galvanized pipe, in contrast, has that zinc coating. The other color labels aren’t standard terms for this material, so they don’t fit the description of ungalvanized carbon steel pipe.