ASTM A790 TP S31803 Stainless Steel Electropolished Pipes

ASTM A790 TP S31803 Stainless Steel Electropolished Pipes

ASTM A790 TP S31803 Stainless Steel Electropolished Pipes are duplex stainless steel pipes combining austenitic and ferritic microstructures to deliver high strength, excellent toughness, and superior resistance to stress corrosion cracking. Grade S31803 provides outstanding protection against pitting and crevice corrosion, especially in chloride-containing environments.

The electropolishing process enhances the chromium-rich passive layer and produces an ultra-smooth, bright, and contamination-free surface finish. This significantly reduces surface roughness and improves corrosion resistance, making these pipes suitable for demanding industrial and hygienic applications.

Specifications

Standard	ASTM A790 / ASME SA790
Grade	TP S31803 (Duplex 2205)
Type	Seamless / Welded & Electropolished
Size Range	1/8" NB to 24" NB
Wall Thickness	Schedule 5S to Schedule 80S
Surface Roughness	Ra ≤ 0.4 µm (or as per customer requirement)
Length	6 Meters Standard / Custom Length
End Type	Plain End, Beveled End

Key Features

• Duplex Microstructure: High strength with good impact resistance.
• Excellent Corrosion Resistance: Strong protection against chlorides and harsh chemicals.
• Electropolished Surface: Smooth, clean, and hygienic finish.
• Improved Passive Layer: Enhanced durability and long service life.
• Cost Efficiency: Higher strength allows reduced wall thickness.

Chemical Composition (Typical)

Element	TP 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 Processing Plants
• Desalination & Water Treatment Facilities
• Chemical Processing Equipment
• Marine & Offshore Structures
• High-Pressure Piping Systems

Quality Testing

• Hydrostatic Testing
• Ultrasonic Testing (UT)
• Surface Roughness (Ra) Measurement
• Positive Material Identification (PMI)
• Mechanical & Dimensional Inspection

Conclusion

ASTM A790 TP S31803 Stainless Steel Electropolished Pipes offer a balanced combination of high mechanical strength, superior corrosion resistance, and an ultra-smooth electropolished finish. These properties make them ideal for demanding industrial, marine, and high-purity applications requiring durability, reliability, and long-term performance.