ASTM A790 UNS S31803 ERW Pipes

ASTM A790 UNS S31803 ERW Pipes

ASTM A790 UNS S31803 ERW Pipes are duplex stainless steel welded pipes combining austenitic and ferritic microstructures to deliver high strength and excellent resistance to stress corrosion cracking, pitting, and crevice corrosion. These pipes are ideal for aggressive chemical and marine environments.

Duplex 31803 provides nearly double the yield strength of conventional austenitic stainless steels, making it suitable for high-pressure applications while maintaining excellent corrosion resistance and durability.

Specifications

Standard	ASTM A790 / ASME SA790
Grade	UNS S31803 (Duplex 2205)
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

• High Strength: Nearly twice the yield strength of standard austenitic grades.
• Excellent Pitting Resistance: Performs well in chloride-rich environments.
• Superior Stress Corrosion Resistance: Ideal for marine and chemical industries.
• Cost Efficient: Higher strength allows thinner wall design, reducing material usage.
• Long Service Life: Reduced maintenance and enhanced durability.

Chemical Composition (Typical)

Element	S31803 (%)
Carbon	0.03 Max
Chromium	21.0 – 23.0
Nickel	4.5 – 6.5
Molybdenum	2.5 – 3.5
Nitrogen	0.08 – 0.20

Applications

• Oil & Gas Pipelines
• Offshore Platforms
• Chemical Processing Plants
• Marine Equipment
• Desalination Plants

Quality Testing

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

Conclusion

ASTM A790 UNS S31803 ERW Pipes provide exceptional strength, superior corrosion resistance, and long-term performance, making them a reliable solution for demanding industrial and marine applications.