EN10219 S355J0H LSAW Steel Pipe Welded CS Pipe

LSAW:Longitudinally Submerged Arc Welded Pipe

1

Core features and advantages

"Welding method:Longitudinal submerged arc welding (SAWL), with a straight weld seam and no spiral weld seam.
"High strength and high toughness:suitable for high pressure, low temperature, and corrosive environments.

Wide range of sizes:
Outer diameter: Φ406mm to Φ1626mm (16"-64"), some manufacturers can achieve Φ3000mm

Wall thickness: 6.0mm to 75mm (approximately 1/4"-3")

Length: typically 6M 12 m

Standard certification: Compliant with international standards such as API 5L, ASTM, EN, ISO, GB, DNV, etc

Manufacturing process:mainly including two forming methodsUOEandJCOE.

2

Main application areas

Oil and gas transmission pipelines:accounting for more than 70% of the usage of LSAW steel pipes, especially suitable for long-distance, large-diameter, and high-pressure transmission
Structural engineering:such as bridges, wind turbine towers, building support piles, etc
Pile casing and foundation structure:Compliant with ASTM A252 standard, used for cast-in-place concrete piles or permanent load-bearing structures
Anticorrosion treatment:Common coatings include 3PE, FBE, epoxy, asphalt, etc., suitable for buried or marine environments

3

Technical Request

EN10219 S355J0H the welded pipe is made of fine-grained unalloyed steel, which requires a minimum yield strength of 355MPa (nominal thickness ≤ 16mm) and a tensile strength of 470-630MPa.

S:Structural Steel.

355:Minimum yield strength (355 MPa) for wall thicknesses ≤ 16mm.

J0:Impact properties. Guarantees a minimum of 27 Joules at 0°C (Charpy V-notch test).

H: Hollow Section (specifically designed for hollow profiles).

Chemical Composition (Cast Analysis)

For trading purposes, it is important to note the Carbon Equivalent (CEV) value, as it affects weldability. The max CEV for this grade is typically0.45 percent

Mechanical Properties

This is the key selling point for S355J0H: it offers high strength with good low-temperature toughness (0°C).

4

Manufacturing Process

LSAW (Longitudinal Submerged Arc Welding) Manufacturing Process
Unlike seamless pipes or ERW (Electric Resistance Welded) pipes, LSAW is specifically used for large diameters and thick walls. It is often referred to as JCOE or UOE depending on the forming process

A. The JCOE Process
1.Edge Milling:Steel plates (skelp) are beveled.

2.Pre-bending:Edges are crimped to ensure weld geometry.

3.J/C/O Forming:The plate is pressed step by step into a "J" shape, then a "C" shape, and finally an "O" shape (cylinder).

4.Submerged Arc Welding (SAW):The seam is welded internally and externally using a granular flux. This process creates a deep penetration weld with a smooth, strong bead.

5.Expanding (Optional):The pipe is mechanically expanded to improve dimensional accuracy and relieve residual stresses

5

Equivalent Grades