X42 X52 X60 X65 X70 X80 Q355B P265GH LSAW Carbon Steel Welded Pipe | GB/T 9711 API 5L EN 10217 Longitudinal Submerged‑Arc Welded Tube

LSAW plate‑bending longitudinal submerged‑arc welding, high weld quality and excellent dimensional roundness
Cover API5L line‑pipe X42‑X80, structural Q355B and pressure‑vessel grade P265GH
Suitable for critical heavy‑duty projects: offshore piling, nuclear auxiliary piping, high‑pressure trunk pipeline
Strict full‑body plate inspection + weld multi‑NDT test, meet API & European EN standard requirements
Support customized heavy wall thickness, various anti‑corrosion coating and bevel end for site welding

Product Overview

X42, X52, X60, X65, X70, X80, Q355B, P265GH LSAW Carbon Steel Welded Pipe is longitudinal submerged‑arc welded pipe, manufactured by heavy steel plate bending & forming, double‑sided submerged‑arc welding. Compare with SSAW spiral pipe, LSAW has straight weld seam, better roundness, lower residual stress, higher comprehensive mechanical performance for critical heavy‑duty working conditions.

X42‑X80 are API 5L line pipe grades for onshore and offshore oil & gas trunk transmission pipeline. Q355B is high‑strength structural grade for heavy steel column and offshore foundation piles. P265GH is European pressure‑vessel grade for pressure vessel shells and high‑temperature circulating water piping.

Typical application includes oil‑gas trunk pipelines, nuclear power circulating water piping, heavy steel structural columns, offshore platform foundation piles, pressure vessel shells.

Carbon Steel Welded Steel Pipe

Chemical & Mechanical Property Snapshot

Item	Q355B LSAW	P265GH LSAW	X42‑X60 LSAW	X65‑X80 LSAW
Carbon(C)	≤0.22%	≤0.20%	≤0.24%	≤0.26%
Manganese(Mn)	1.00‑1.60%	0.60‑1.40%	0.80‑1.50%	0.80‑1.70%
Silicon(Si)	≤0.50%	≤0.40%	≤0.45%	≤0.45%
Sulfur(S)	≤0.030%	≤0.030%	≤0.030%	≤0.025%
Phosphorus(P)	≤0.030%	≤0.030%	≤0.030%	≤0.025%
Min Yield Strength(MPa)	355	265	415‑485	450‑555
Tensile Strength(MPa)	470‑630	410‑530	520‑700	535‑760
Min Elongation	≥17%	≥23%	≥17%	≥16%
Weld Seam Test	Pass	Pass	Pass	Pass
MOQ	10 Metric Tons	10 Metric Tons	10 Metric Tons	10 Metric Tons
Lead Time	25‑30 working days	25‑30 working days	25‑30 working days	25‑30 working days

Detailed Technical Specifications

Item	Details
Product Name	X42 X52 X60 X65 X70 X80 Q355B P265GH LSAW Longitudinal Submerged‑Arc Welded Pipe
Welding Type	LSAW Longitudinal Submerged‑Arc Welded
Applicable Standards	GB/T 9711, API 5L, EN 10217
Material Grades	X42, X52, X60, X65, X70, X80, Q355B, P265GH
Outer Diameter	406 mm ‑1626 mm
Wall Thickness	6 mm ‑50 mm
Standard Length	6 m /12 m, custom length available
Pipe End	30°/37.5° welding bevel end
Surface & Coating	Bare black, 3PE,FBE epoxy anti‑corrosion coating
Inspection	Plate incoming inspection, weld UT/RT, hydrostatic test, full dimension check
Documentation	Mill Test Certificate, API 5L related documents
MOQ	10 Ton
Payment Terms	T/T, L/C at Sight
Delivery Time	25‑30 working days after receiving deposit
Package	Waterproof wrapping + heavy steel strapping, bulk shipment for large‑diameter pipe

Shape Table

Shape Type	Description	Applicable Pipe Type
Round / Circular Tube	Standard circular cross-section, most widely used	ERW, SSAW, LSAW Carbon Welded Pipe
Straight End	Plain ends, no threading, cut flat	ERW, SSAW, LSAW
Beveled End	30° / 37.5° welding bevel for butt welding	SSAW, LSAW (large-diameter pipeline)
Threaded End	Thread + coupling for connection	Small-size ERW pipe
Grooved End	Groove for mechanical coupling connection	Medium-size ERW pipe for fire & water systems
Cut to Fixed Length	6 m, 12 m, or custom fixed cut length	ERW / SSAW / LSAW

Dimension Table

Pipe Type	Outer Diameter Range	Wall Thickness Range	Standard Length	Tolerance
ERW Welded Pipe	12.7 mm–610 mm	0.8 mm–20 mm	6 m / 12 m	OD ±0.5%, WT ±10%
SSAW Spiral Welded Pipe	219 mm–3620 mm	5 mm–25.4 mm	6 m / 12 m or custom	OD ±1.0%, WT -5% to +12.5%
LSAW Longitudinal Welded Pipe	406 mm–1626 mm	6 mm–50 mm	6 m / 12 m or custom	OD ±0.75%, WT -5% to +10%

Product Comparison Table

Product Grade Group	Manufacturing Process	Main Standards	Size Range	Typical Applications	Selection Advantage
Q355B LSAW	LSAW Longitudinal Submerged‑Arc Welded	GB/T9711, EN10217	OD406‑1626mm WT6‑50mm	Heavy‑duty steel column, offshore foundation piles	High strength, excellent roundness for heavy structural load
P265GH LSAW	LSAW Longitudinal Submerged‑Arc Welded	EN10217	OD406‑1626mm WT6‑50mm	Pressure vessel shell, high‑temperature circulating water pipe	European pressure‑vessel certified grade
X42‑X60 LSAW	LSAW Longitudinal Submerged‑Arc Welded	GB/T9711, API5L	OD406‑1626mm WT6‑50mm	Regional oil‑gas transmission trunk pipeline	Stable comprehensive performance for medium‑strength pipeline
X65‑X80 LSAW	LSAW Longitudinal Submerged‑Arc Welded	GB/T9711, API5L PSL2	OD406‑1626mm WT6‑50mm	Main long‑distance oil‑gas trunk line, offshore pipeline	High strength & low impurity for critical energy engineering

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Product Packaging

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FAQs

What is difference between LSAW and SSAW welded pipe?

LSAW is plate‑bending longitudinal weld pipe with better roundness and lower residual stress, used for critical high‑requirement projects. SSAW spiral pipe is more cost‑effective for general large‑diameter piling & municipal pipeline.

What project will choose API 5L X80 LSAW pipe?

X80 high‑strength LSAW pipe is applied for long‑distance high‑pressure oil & gas trunk transmission pipeline.

Can LSAW pipe be used for offshore foundation piling?

Yes, Q355B and X‑series LSAW pipe are popular for offshore platform foundation piles with anti‑corrosion coating.

What wall‑thickness range for LSAW pipe?

Wall thickness 6‑50mm, heavy wall LSAW can be supplied upon project requirement.

What is production lead‑time for LSAW pipe?

Normally 25‑30 working days after deposit, subject to raw steel plate availability.

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X42 X52 X60 X65 X70 X80 Q355B P265GH LSAW Carbon Steel Welded Pipe | GB/T 9711 API 5L EN 10217 Longitudinal Submerged‑Arc Welded Tube