SS 904L pipes, also known as UNS N08904, are manufactured with high chromium, nickel, and iron content, providing superior corrosion resistance, strength, and toughness. The low carbon content, combined with copper and molybdenum, contributes to excellent resistance against pitting and crevice corrosion. This material is well-suited for environments requiring resistance to elevated temperatures and high corrosion levels.

• Chemical processing
• Oil and gas
• Pharmaceutical

The high chromium content promotes and maintains a passive film that protects the material in numerous corrosive environments. 904L offers greater resistance to precipitation of ferrite and sigma phases during cooling and welding compared to other molybdenum-containing stainless steels like 316L and 317L. The low carbon content eliminates the risk of intercrystalline corrosion during cooling or welding, with a maximum service temperature of 450°C.

904L offers good formability and weldability characteristics due to its low carbon content. It provides excellent toughness and strength at both room temperature and elevated temperatures, along with superior fatigue strength even after prolonged exposure to high temperatures.

This steel type features good ductility and excellent machinability properties, making it easy to work with during fabrication of parts or components. It also exhibits excellent thermal expansion properties, making it suitable for cryogenic environments or high-temperature applications where thermal shock may occur.

• Energy Chemical industry
• Mechanical Engineering
• Automobile Industry
• Rail Transit Equipment
• Steamship production
• Bridge Engineering

Annealing: The recommended annealing temperature for 904L wrought steel is 1095°C (2000°F).

• Size control
• Chemical composition control
• Ultrasonic testing of steel tube
• Hydraulic testing machine