ASTM A312 TP 904L ERW Pipes

ASTM A312 TP 904L ERW Pipes

ASTM A312 TP 904L ERW Pipes are high alloy austenitic stainless steel welded pipes designed for extremely corrosive environments. With high nickel and molybdenum content along with added copper, 904L offers exceptional resistance to strong acids, chloride stress corrosion cracking, and pitting corrosion.

These pipes are widely used in chemical processing industries, marine environments, oil & gas refineries, and fertilizer plants where superior corrosion resistance and long-term durability are critical.

Specifications

Standard	ASTM A312 / ASME SA312
Grade	TP 904L
Manufacturing Process	Electric Resistance Welded (ERW)
Size Range	1/2" NB to 24" NB
Wall Thickness	Schedule 5S to Schedule 80S
Length	6 Meters Standard / Custom Length
Surface Finish	Annealed & Pickled, Polished, Matte Finish
End Type	Plain End, Beveled End, Threaded

Key Benefits

• Exceptional Acid Resistance: Performs well in sulfuric and phosphoric acid environments.
• High Nickel Content: Superior resistance to stress corrosion cracking.
• Improved Pitting Resistance: Enhanced molybdenum content increases durability in chloride conditions.
• Excellent Weldability: Maintains structural integrity after welding.
• Long-Term Reliability: Reduced maintenance and extended service life.

Chemical Composition (Typical)

Element	904L (%)
Carbon	0.02 Max
Chromium	19.0 – 23.0
Nickel	23.0 – 28.0
Molybdenum	4.0 – 5.0
Copper	1.0 – 2.0

Applications

• Chemical Processing Equipment
• Oil & Gas Refineries
• Marine & Offshore Systems
• Fertilizer Plants
• Heat Exchangers & Pressure Vessels

Quality Testing

• Hydrostatic Testing
• Ultrasonic Testing (UT)
• Eddy Current Testing
• PMI Testing
• Dimensional Inspection

Conclusion

ASTM A312 TP 904L ERW Pipes provide outstanding resistance to severe corrosive environments, superior mechanical strength, and long-term performance, making them ideal for critical industrial applications requiring premium stainless steel solutions.