
Here is a quick technical overview of stainless steel round pipes, broken down by grades, manufacturing types, and wall thickness standards.
| Grade | Composition Highlights | Key Characteristics | Common Applications |
| SS 201 | High Mn, lower Ni (~1%) | Low cost, moderate strength, lower corrosion resistance | Indoor furniture, handrails, decorative trim |
| SS 304 | 18% Cr, 8% Ni | Standard austenitic grade, excellent formability & general corrosion resistance | Food processing, chemical piping, water supply |
| SS 316 | 16% Cr, 10% Ni, 2-3% Mo | Added molybdenum prevents pitting corrosion from chlorides & acids | Marine fittings, pharmaceutical, offshore plants |
| SS 310 | 25% Cr, 20% Ni | High heat resistance (up to 1150C), resists oxidation | Heat exchangers, furnace parts, boiler tubes |
Seamless (SMLS): Extruded from a solid steel billet without any weld seams. Handles significantly higher internal pressure rating, ideal for boilers, high-pressure hydraulics, and critical oil & gas applications.
Welded (ERW / EFW): Formed from rolled stainless steel strip/plate and longitudinal seam welded. More cost-effective, tighter wall thickness tolerances, and suitable for structural, architectural, and moderate-pressure fluid transport.
Pipes are specified using Nominal Pipe Size (NPS) and Schedule (Sch) per ASME B36.19M:
Wall Thickness Schedules:
Sch 5S / 10S: Light wall used primarily for sanitary tubing, HVAC, and low-pressure drainage.
Sch 40S: Standard wall general industrial fluid piping and structural applications.
Sch 80S: Extra heavy wall high-pressure environments, high vibration, or corrosive allowance.
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