Alloy Steel Seamless Pipe ASTM A335 P11

Overview

ASTM A335 P11 chrome-molybdenum alloy seamless pipes are purpose-built for high-temperature, high-pressure environments where standard carbon steel falls short. The 1.25% Cr – 0.5% Mo alloying provides exceptional oxidation resistance and elevated-temperature strength, making these pipes the preferred choice in power generation and refinery service.

Key Features

• Superior creep resistance — maintains structural integrity at sustained temperatures up to 550°C
• Oxidation and hydrogen resistance — ideal for hydrogen-rich and sulfurous process environments
• Heat treatment — normalized and tempered for optimal toughness and mechanical properties
• Weldability — compatible with standard low-hydrogen welding procedures with controlled preheat

Typical Applications

Power boilers, superheaters, reheaters, main steam lines, catalytic reformer piping, and hydrogen service lines in oil refineries.