What is the difference between seamless tubing and seamless pipe?

Seamless tubing is measured by OD (Outside Diameter) and wall thickness is specified in BWG (Birmingham Wire Gauge) or fractions of an inch. Seamless pipe is measured by NPS (Nominal Pipe Size) and wall thickness is specified by Schedule numbers (SCH 5S, 10S, 40S, 80S, 160, XXH). Tubing is typically used for instrumentation and precision applications, while pipe is used for process piping and fluid transport.

What grades of stainless steel are available?

Available grades include: TP304/TP304L (general purpose, corrosion resistant), TP316/TP316L (enhanced corrosion resistance for seawater and chemicals), TP321/TP347 (stabilized grades for high temperature up to 900°F), TP310S (high temperature to 1150°F), Duplex 2205 (double the yield strength of 316L with good corrosion resistance), and Super Duplex 2507 (higher strength and better corrosion resistance for harsh environments).

What ASTM standards apply to SS seamless tubes and pipes?

ASTM A213 covers seamless boiler, superheater, and heat exchanger tubes. ASTM A269 covers general corrosion-resistant and vacuum service tubing. ASTM A312 covers seamless and welded pipe for high temperature and general corrosion service. ASTM A511 covers seamless mechanical tubing used in demanding applications.

What is the temperature and pressure range?

Temperature range is -196°C (cryogenic) to +600°C depending on grade. Pressure ratings vary by size and wall thickness, with small high-pressure tubes rated up to 10000 PSI. TP321 and TP347 are recommended for high temperature applications up to 900°F (480°C). TP310S handles temperatures up to 1150°F (620°C).

What testing is performed on seamless tubes and pipes?

Standard testing includes: Hydrostatic testing (pressure test to verify integrity), Eddy Current testing (detects surface and near-surface defects), and Visual inspection. For pipe, additional hydrostatic pressure testing is standard. Material test certificates (MTC) EN 10204 3.1 or 3.2 are provided with each shipment.

Premium Quality

SS Seamless Tubes and Pipes

Name: SS Seamless Tubes and Pipes
Brand: Supreme Valves
SKU: SV-SSSEAMLESS-TP
Rating: 4.8 (89 reviews)

Stainless steel seamless tubes (OD based) and seamless pipes (NPS based) for industrial applications. Available in TP304, TP316, TP321, TP347, TP310S, Duplex 2205, and Super Duplex 2507. Size range 1/4 to 12 inch. Wall thickness from SCH 5S to XXH. Temperature rating -196°C to +600°C. Pressure up to 10000 PSI for small high-pressure sizes. Standards: ASTM A213, A269, A312, A511.

Quick Summary

SS Seamless Tubes and Pipes = Seamless construction (no weld seam) for maximum reliability. Tubes are OD-based with BWG wall thickness; Pipes are NPS-based with Schedule wall thickness. Grades range from general-purpose 304/316L to high-performance Duplex 2205 and Super Duplex 2507. Used in Oil & Gas, Chemical, Petrochemical, Power, Food & Beverage, Pharmaceutical, and Water Treatment.

Key Specifications

Tubing OD: 1/4 to 4 inch

Pipe NPS: 1/8 to 12 inch

Tubing Wall: BWG 22 to XXH

Pipe Wall: SCH 5S to XXH

Temperature: -196°C to +600°C

Pressure: Up to 10000 PSI

Standards: ASTM A213, A269, A312, A511

Testing: Hydrostatic, Eddy Current

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Product Overview

Our SS seamless tubes and pipes are manufactured using advanced hot rolling and cold drawing processes to achieve precise dimensions and superior surface finish. The seamless construction eliminates weld seams, providing maximum reliability in demanding applications.

We supply a comprehensive range of stainless steel seamless tubing (OD based) for instrumentation, hydraulic, and precision applications, and seamless pipes (NPS based) for process piping systems.

All materials are supplied with complete material test certificates (MTC) per EN 10204 3.1/3.2, ensuring full traceability and quality assurance for critical applications.

Types: Seamless Tubing vs Seamless Pipe

Seamless Tubing (OD Based)

Size Range: 1/4 to 4 inch OD (6mm to 101.6mm)
Measurement: Outside Diameter (OD)
Wall Thickness: BWG or fraction (e.g., 0.035", 0.065")
Applications: Instrumentation, hydraulics, precision applications
Standards: ASTM A213, A269
Common Uses: Oil & gas instrumentation, process sampling lines, hydraulic control lines

Seamless Pipe (NPS Based)

Size Range: 1/8 to 12 inch NPS (DN6 to DN300)
Measurement: Nominal Pipe Size (NPS)
Wall Thickness: Schedule (SCH 5S to XXH)
Applications: Process piping, fluid transport, steam systems
Standards: ASTM A312, A511
Common Uses: Chemical processing, oil & gas pipelines, power plant piping

Materials of Construction (MOC)

Component	Material Specification
Body & Bonnet	Ductile Iron (ASTM A536 / EN-GJS-400-15)
Stem / Spindle	SS 410 / SS 420
Seat / Trim	EPDM / NBR / Bronze

Technical Specifications

Parameter	Specification / Standard
Manufacturing / Design Standard	EN 1171 / AWWA C509 / BS 5163
Testing Standard	API 598 / EN 12266-1
Pressure Rating	PN16 / PN25