ALLOY PIPE CHROME MOLY

Alloy Steel Pipe is carbon steel that has been alloyed with other elements—primarily Chromium and Molybdenum—to improve its mechanical properties. Unlike standard carbon pipe, Alloy pipe is designed specifically to maintain its strength and resist corrosion at extremely high temperatures.

High Temp: Chrome Moly (ASTM A335)

Often referred to as "P-Grade" pipe, ASTM A335 is the standard for the power generation and petrochemical industries. The addition of Chromium improves oxidation resistance, while Molybdenum increases the pipe's tensile strength and creep resistance at high temperatures.

Low Temp: Carbon Steel (ASTM A333)

While Chrome Moly handles the heat, ASTM A333 is the industry standard for extreme cold. This "Low Temp" carbon pipe is subjected to rigorous impact testing to ensure it does not become brittle and crack in freezing environments.

• Grade 1: Impact tested via Charpy V-Notch at -50°F (-45°C).
• Grade 6: Impact tested at -50°F (-45°C). This is the most common low-temp grade.
• Common Applications: Compressed gas piping, cryogenic services, and arctic pipelines.

Matching Fittings

When welding Alloy pipe, you cannot use standard carbon steel fittings. You must use fittings that precisely match the chemistry of the pipe to ensure the weld holds under extreme pressure and temperature cycling.