Key Feature

The Premium Integrity Piping Solution. Homogeneous structure without weld seams ensures maximum reliability for critical high-pressure, high-temperature, and corrosive applications.

The preferred choice for applications where weld integrity concerns or extreme service conditions justify higher cost.

Manufacturing Processes

Extrusion: Solid billet forced through die
Rotary Piercing: Solid bar pierced while rotating
Hot Rolling: At elevated temperatures
Cold Drawing: For precise dimensions

Different processes for different size ranges and quality requirements.

Available Grades

Austenitic: 304/304L, 316/316L, 321, 347, 310S
Ferritic: 430, 446
Martensitic: 410, 420
Duplex: 2205, 2507
Super Austenitic: 904L, 6%Mo grades
Precipitation Hardening: 17-4PH

Complete range of stainless steel grades available.

Size Range

Diameter: Typically 1/8" to 24" (3mm to 600mm)
Wall Thickness: 0.5mm to 50mm+
Length: Standard 6m, up to 12-18m available

More limited in large diameters than welded pipe.

Dimensional Tolerances

OD Tolerance: ±0.5% to ±1.0%
Wall Tolerance: ±12.5% standard, ±10% precision
Concentricity: Superior to welded
Straightness: Good

Generally less precise than welded but more consistent wall thickness.

Surface Quality

ID Surface: Generally rougher than welded
OD Surface: Can be polished to various finishes
Decarburization: Possible on OD surface
Scale: Requires pickling/passivation

Internal surface may require special processing for certain applications.

Mechanical Properties

Uniform Properties: Throughout cross-section
Directional Properties: More isotropic than welded
No Weld HAZ: Consistent microstructure
Higher Pressure Rating: For same dimensions

Superior structural integrity for critical applications.

Pressure Ratings

ASME B31.3: Full compliance
Higher Allowable Stresses: Due to no weld factor
Code Recognition: All major pressure codes
Safety Factor: Often higher than welded

Preferred for high-pressure applications in critical services.

Key Standards

ASTM A312: Seamless Austenitic Pipe (primary standard)
ASTM A213: Seamless Boiler/Heat Exchanger Tubes
ASTM A269: Seamless General Service Tubes
ASTM A789/A790: Seamless Duplex Pipe
EN 10216-5: Seamless Pressure Tubes
ASME SA312: Code Construction

Stringent quality requirements for critical applications.

Common Applications

• Oil & Gas: Downhole tubing, wellhead components, flowlines
• Chemical Processing: High-pressure reactors, corrosive service lines
• Power Generation: Boiler tubes, superheaters, high-pressure steam lines
• Aerospace: Hydraulic systems, fuel lines, structural components
• Pharmaceutical: High-purity process systems, critical utility lines
• Nuclear: Primary coolant lines, reactor components
• Marine: Critical seawater systems, naval applications

Specifically selected where maximum reliability is essential.