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This guide explains how OD, wall thickness, grade, plate availability, forming capacity, welding qualification and testing affect LSAW pipe manufacturing feasibility. It helps buyers identify technical and commercial constraints before quotation.
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Weld Bevel Types for Steel Pipe Ends: V Bevel, Compound Bevel and Buyer Notes

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Welded Steel Pipe

Welded Steel Pipe for Pipeline and Structural Projects

Forever Steel supplies welded steel pipe for oil and gas pipelines, water transmission, piling, structural engineering, port construction, fire protection and industrial piping projects. The welded pipe range includes ERW steel pipe, LSAW steel pipe and SSAW steel pipe, each suited to different diameter ranges, wall thicknesses, pressure levels and project conditions.

For correct selection, buyers should compare the pipe manufacturing method, weld seam type, outside diameter, wall thickness, steel grade, project standard, coating requirement, inspection plan, packing method and shipping route before confirming the order.

Welded Steel Pipe Types: ERW, LSAW and SSAW

Pipe Type	Welding Method	Best-Fit Application	Common Standards	Key Inspection Point
ERW steel pipe	Electric resistance welding	Medium-diameter pipeline, water, gas, fire protection and structural use	API 5L, ASTM A53, ASTM A500, EN 10217	Weld seam UT, hydrostatic test, flattening or bending test
LSAW steel pipe	Longitudinal submerged arc welding	Large-diameter, heavy-wall, high-pressure and offshore-related projects	API 5L PSL1/PSL2, ASTM A672, ASTM A691	Straight seam quality, RT/UT records, dimensional tolerance
SSAW steel pipe	Spiral submerged arc welding	Long-distance water transmission, piling, structural and large-volume pipeline projects	API 5L, ASTM A252, AWWA C200, EN 10219	Spiral weld control, ovality, end squareness and coating compatibility

Technical Specifications & Size Range

Outside Diameter (O.D.): 1/2" – 24" (21.3mm – 610mm)

Wall Thickness (W.T.): 2.0mm – 20mm (SCH 10, SCH 20, SCH 40, SCH 80, SCH 160, STD, XS)

Single Pipe Length: SRL (Single Random Length): 5m – 7m

DRL (Double Random Length): 10m – 12.8m

Fixed Length: Customized up to 18 meters for special projects.

Global Manufacturing Standards & Steel Grades

We support multi-national standards to facilitate seamless integration into global supply chains:

Region / Standard	Common Standards	Available Steel Grades
American (API/ASTM)	API 5L (PSL1/PSL2), ASTM A53, ASTM A500	Grade B, X42, X46, X52, X56, X60, X70
European (EN/DIN)	EN 10219, EN 10217, DIN 2458	S235JR, S275JR, S355J2H, P235TR1/TR2
Japanese (JIS)	JIS G3444, JIS G3452	STK400, STK500, SGP
Australian (AS/NZS)	AS/NZS 1163, AS/NZS 1074	C250, C350, C450
German (DIN)	DIN 1626, DIN 17120	St37.0, St44.0, St52.0

Pipe End Preparation

To ensure efficient on-site installation, we offer professional end finishing:

Bevelled Ends: Standard 30° (+5°/-0°) with 1.6mm root face (per ANSI B16.25) for easy welding.

Plain Ends: Square cut for structural use or socket welding.

Threaded & Coupled (T&C): Precise threading according to API 5B or ASTM standards.

Grooved Ends: Suitable for rapid mechanical coupling systems.

Surface Treatment & Corrosion Protection

Customized coating solutions to protect against atmospheric and soil corrosion:

Temporary Protection: Black Vanish painting, Light Oiling.

High-Durability Coating: Hot-Dipped Galvanized (HDG) – Zinc coating up to500g/m².

Advanced Anti-Corrosion: 3PE (Three-Layer Polyethylene), FBE (Fusion Bonded Epoxy), or 3PP coating for underground burial.

Packaging & Logistics Excellence

We understand that long-distance international shipping requires superior packaging to prevent damage:

Hexagonal Bundling: Small diameter pipes are bundled with high-tensile steel strips and heavy-duty nylon lifting slings.

End Protection: Heavy-duty plastic caps or metal ring protectors to safeguard bevels and threads.

Sea-Worthy Marking: Each pipe is stenciled withHeat No., Size, Grade, Standard, and Manufacturer Logo(Customized marking supported).

Loading Precautions:

Use of wooden dunnage and rubber separators to prevent steel-on-steel friction.

Rigid bracing and lashing within containers or bulk vessels to prevent shifting during transit.

Quality Assurance (QA/QC)

Mill Test Certificate (MTC):Issued according toEN 10204 3.1or 3.2.

Third-Party Inspection: We welcome and facilitate inspections by SGS, BV, TUV, or Lloyd's Register.

Testing Protocol: 100% Hydrostatic Test, Online Ultrasonic (UT) of weld seams, and Flattening/Bending tests.

RFQ Checklist for Welded Steel Pipe Orders

Pipe type: ERW, LSAW or SSAW.
Standard and grade: API 5L, ASTM A53, ASTM A252, ASTM A500, EN 10217 or EN 10219.
Size: outside diameter, wall thickness, length and quantity.
Pipe end: plain end, bevelled end, threaded end or grooved end.
Surface treatment: black painting, varnish, galvanized, 3PE, FBE or epoxy coating.
Required documents: MTC, inspection report, test records, packing photos and shipping marks.