LSAW Steel Pipe

Longitudinal Submerged Arc Welded Steel Pipe – Large diameter, high-pressure transmission pipeline with superior weld quality.

OD: 16″ – 60″WT: 6.0–50mmAPI 5L PSL1/PSL2ASTM A671/A672EN 10217

LSAW Steel Pipe

LSAW (Longitudinal Submerged Arc Welding) steel pipes are manufactured from wide steel plates through the JCOE process: the plate edges are first crimped (J), then step-bent into a C-shape, an O-shape, and finally expanded (E) to the precise diameter. The longitudinal seam is welded using submerged arc welding (SAW) from both inside and outside.

With superior dimensional accuracy achieved through mechanical expansion, LSAW pipes are the preferred choice for high-pressure oil and gas trunk lines, water transmission mains, and structural applications requiring large diameters and heavy walls.

JCOE Process Longitudinal Weld API 5L X42-X80 Heavy Wall Thickness High Strength Oil & Gas Pipeline

Technical Specifications

Applicable Standards

Standard	Steel Grade	Description
API SPEC 5L	Gr.B, X42, X46, X52, X56, X60, X65, X70, PSL1 / PSL2	Specification for line pipe used in oil & gas transportation systems
ASTM A252	GR.1, GR.2, GR.3	Standard for welded and seamless steel pipe piles
ASTM A139	GR.A, GR.B, GR.C, GR.D, GR.E	Standard for electric-fusion (arc)-welded steel pipe (NPS 4 and over)
ASTM A671	CA55, CB60, CB65, CB70, CC60, CC65, CC70	Electric-fusion-welded steel pipe for atmospheric and lower temperatures
ASTM A672	B60, B65, B70, C60, C65, C70	Electric-fusion-welded steel pipe for high-pressure service at moderate temperatures
EN 10219	S235JRH, S275J0H/J2H, S355J0H/J2H, S355K2H	European standard for cold-formed welded structural hollow sections
EN 10217	P195TR1/TR2, P235TR1/TR2, P265TR1/TR2, P235GH, P265GH	European standard for welded steel tubes for pressure purposes
ISO 3183	L245, L290, L360, L415, L485	International standard for petroleum and natural gas industries – steel pipe for pipelines
GOST 20295	K34, K38, K42, K50, K52, K55, K60	Russian standard for steel welded pipes for main pipelines, heating systems, and industrial installations
EN 10210	S235JRH, S275J0H, S355J2H, S355NH, S420NH	European standard for hot finished structural hollow sections of non-alloy and fine grain steels

LSAW Pipe Dimensions

OD (mm)	NPS (in)	6.0	7.0	8.0	9.0	10.0	11.0	12.0	13.0	14.0	15.0	16.0	18.0	20.0	22.0	25.0	30.0
406.4	16.0	•	•	•	•	•	•	•
426.0		•	•	•	•	•	•	•
457.0	18.0	•	•	•	•	•	•	•
478.0		•	•	•	•	•	•	•
508.0	20.0	•	•	•	•	•	•	•	•	•
529.0		•	•	•	•	•	•	•	•	•
559.0	22.0	•	•	•	•	•	•	•	•	•
610.0	24.0	•	•	•	•	•	•	•	•	•	•	•
630.0		•	•	•	•	•	•	•	•	•	•	•
660.0	26.0	•	•	•	•	•	•	•	•	•	•	•	•	•
711.0	28.0	•	•	•	•	•	•	•	•	•	•	•	•	•
720.0		•	•	•	•	•	•	•	•	•	•	•	•	•
762.0	30.0	•	•	•	•	•	•	•	•	•	•	•	•	•
813.0	32.0	•	•	•	•	•	•	•	•	•	•	•	•	•
820.0		•	•	•	•	•	•	•	•	•	•	•	•	•
864.0	34.0		•	•	•	•	•	•	•	•	•	•	•	•
914.0	36.0			•	•	•	•	•	•	•	•	•	•	•
920.0				•	•	•	•	•	•	•	•	•	•	•
965.0	38.0			•	•	•	•	•	•	•	•	•	•	•
1016.0	40.0			•	•	•	•	•	•	•	•	•	•	•	•
1020.0				•	•	•	•	•	•	•	•	•	•	•	•
1067.0	42.0			•	•	•	•	•	•	•	•	•	•	•	•
1118.0	44.0			•	•	•	•	•	•	•	•	•	•	•	•
1168.0	46.0			•	•	•	•	•	•	•	•	•	•	•	•
1219.0	48.0			•	•	•	•	•	•	•	•	•	•	•	•
1220.0				•	•	•	•	•	•	•	•	•	•	•	•
1321.0	52.0				•	•	•	•	•	•	•	•	•	•	•
1420.0						•	•	•	•	•	•	•	•	•	•	•	•
1422.0	56.0					•	•	•	•	•	•	•	•	•	•	•	•
1524.0	60.0					•	•	•	•	•	•	•	•	•	•	•	•
1620.0						•	•	•	•	•	•	•	•	•	•	•	•

Chemical Composition (%)

Grade	C max	Si max	Mn max	P max	S max	Cu max	Others max
API 5L PSL1 Gr.B (L245)	0.26	—	1.20	0.030	0.030	0.50	①
API 5L PSL1 X42 (L290)	0.26	—	1.30	0.030	0.030	0.50	①
API 5L PSL2 X46 (L320M)	0.22	0.45	1.30	0.025	0.015	0.50	②
API 5L PSL2 X52 (L360M)	0.22	0.45	1.40	0.025	0.015	0.50	②
API 5L PSL2 X56 (L390M)	0.22	0.45	1.40	0.025	0.015	0.50	②
API 5L PSL2 X60 (L415M)	0.12	0.45	1.60	0.025	0.015	0.50	②
API 5L PSL2 X65 (L450M)	0.12	0.45	1.60	0.025	0.015	0.50	②
API 5L PSL2 X70 (L485M)	0.12	0.45	1.70	0.025	0.015	0.50	②
ASTM A252 Gr.2	—	—	—	0.050	—	—	③
ASTM A252 Gr.3	—	—	—	0.050	—	—	③
ASTM A139 Gr.B	0.26	—	1.00	0.035	0.035	—	—
ASTM A139 Gr.C	0.28	—	1.20	0.035	0.035	—	—
ASTM A671 CC60	0.23	0.15–0.40	0.85–1.20	0.025	0.025	—	④
ASTM A671 CC65	0.26	0.15–0.40	0.85–1.20	0.025	0.025	—	④
ASTM A672 B60	0.24	0.15–0.40	0.90	0.025	0.025	—	④
ASTM A672 C65	0.26	0.15–0.40	0.85–1.20	0.025	0.025	—	④
EN 10219 S235JRH	0.17	—	1.40	0.040	0.040	—	N 0.009
EN 10219 S355J0H	0.22	0.55	1.60	0.035	0.035	—	N 0.009
EN 10217-1 P235TR1	0.16	0.35	1.20	0.025	0.020	0.30	⑤
EN 10217-1 P235TR2	0.16	0.35	1.20	0.025	0.020	0.30	⑤ Al 0.020 min
ISO 3183 L360	0.26	—	1.40	0.030	0.030	0.50	①
ISO 3183 L450	0.26	—	1.45	0.030	0.030	0.50	①
GOST 20295-85 K52	—	—	—	—	—	—	⑥
GOST 20295-85 K60	—	—	—	—	—	—	⑥
EN 10210 S235JRH	0.17	—	1.40	0.040	0.040	—	N 0.009
EN 10210 S355J2H	0.22	0.55	1.60	0.030	0.030	—	—

① API 5L PSL1 (welded pipe): C max 0.26%; Ni/Cr ≤ 0.50%, Mo ≤ 0.15%, V+Nb+Ti ≤ 0.15% (t ≤ 25 mm). ② API 5L PSL2 (welded pipe, M grades = TMCP): C ≤ 0.22% for X52M/X56M, C ≤ 0.12% for X60M/X65M/X70M; Si ≤ 0.45%. V ≤ 0.10%, Nb ≤ 0.05%, Ti ≤ 0.04%, Ni/Cr ≤ 0.50%, Mo ≤ 0.15%. Carbon equivalents are mandatory for PSL2: CE_IIW ≤ 0.43, CE_Pcm ≤ 0.25. ③ ASTM A252 specifies P ≤ 0.050% only; C/Mn are at the manufacturer’s discretion. ④ A671/A672 chemistry follows the base plate (CC/C = A516, B = A515); C max varies with plate thickness (typical thickness shown); P/S per ASME SA-20. ⑤ EN 10217-1: Ni/Cr ≤ 0.30%, Mo ≤ 0.08%, Nb ≤ 0.010%, Ti ≤ 0.04%, V ≤ 0.02%; TR2 requires total Al ≥ 0.020%. ⑥ GOST 20295-85 does not specify chemical composition by strength grade; the steel grade is selected by the mill per GOST 380/1050/19282 with CE ≤ 0.46%.

Mechanical Properties

Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Impact (Charpy V-notch)
API 5L PSL1 Gr.B (L245)	≥415	≥245	Per formula ①	—
API 5L PSL1 X42 (L290)	≥415	≥290	Per formula ①	—
API 5L PSL2 X46 (L320M)	435–655	320–525	Per formula	Per Table 8 ⑦
API 5L PSL2 X52 (L360M)	460–760	360–530	Per formula	Per Table 8 ⑦
API 5L PSL2 X56 (L390M)	490–760	390–545	Per formula	Per Table 8 ⑦
API 5L PSL2 X60 (L415M)	520–760	415–565	Per formula	Per Table 8 ⑦
API 5L PSL2 X65 (L450M)	535–760	450–600	Per formula	Per Table 8 ⑦
API 5L PSL2 X70 (L485M)	570–760	485–635	Per formula	Per Table 8 ⑦
ASTM A252 Gr.2	≥414	≥241	≥25	—
ASTM A252 Gr.3	≥455	≥310	≥20	—
ASTM A139 Gr.B	≥415	≥240	≥30	—
ASTM A139 Gr.C	≥415	≥290	≥25	—
ASTM A671 CC60	415–550	≥220	25 / 21*	—
ASTM A671 CC65	450–585	≥240	23 / 19	—
ASTM A672 B60	415–550	≥220	25 / 21	—
ASTM A672 C65	450–585	≥240	23 / 19	—
EN 10219 S235JRH	360–510	≥235	≥24	27 J @ +20 °C
EN 10219 S355J0H	470–630	≥355	≥20	27 J @ 0 °C
EN 10217-1 P235TR1	360–500	≥235	≥25	—
EN 10217-1 P235TR2	360–500	≥235	≥25	40 J @ 0 °C
ISO 3183 L360	≥460	≥360	Per formula	—
ISO 3183 L450	≥535	≥450	Per formula	—
GOST 20295-85 K52	≥510	≥353	≥20 (δ₅)	Per pipe type/diameter
GOST 20295-85 K60	≥588	≥412	≥16 (δ₅)	Per pipe type/diameter
EN 10210 S235JRH	340–470 (t≥3)	≥235 (t≤16)	≥26 (long.)	27 J @ +20 °C
EN 10210 S355J2H	490–630 (t≥3)	≥355 (t≤16)	≥22 (long.)	27 J @ −20 °C

* 2 in. / 8 in. gauge length. ① API 5L PSL1 elongation is determined by the standard formula (varies with specimen size and wall thickness); PSL1 grades have no mandatory Charpy impact requirement. ⑦ API 5L PSL2: yield-to-tensile ratio ≤ 0.93; CVN impact energy is mandatory and per API 5L Table 8 (varies with OD and wall thickness). Values for EN 10210/10219/10217 apply to thickness ≤ 16 mm unless noted; elongation is longitudinal (L₀ = 5.65√S₀). A671/A672 elongation differs by gauge length (transverse). All values are minimum unless shown as a range; actual properties depend on plate specification, delivery condition and pipe dimensions.

Coating & Surface Treatment Options

3LPE / 3LPP Coating

Three-layer polyethylene or polypropylene (per DIN 30670 / DIN 30678) for oil & gas trunk lines. Service life up to 50 years.

FBE Coating

Fusion bonded epoxy for single-layer or dual-layer protection (per CSA Z245.20 / ISO 21809-2). Excellent adhesion and cathodic disbondment resistance.

Black Paint / Varnish

Standard anti-corrosion coating (per ISO 12944) for general structural and water pipeline applications.

Internal Epoxy Lining

Smooth internal epoxy coating (per AWWA C210) for water supply, improving flow efficiency and preventing corrosion.

Concrete Weight Coating

Concrete coating (per ISO 21809-5) for subsea pipelines providing negative buoyancy and mechanical protection.

Packing & Shipping Details

📦 Packing Methods

Waterproof plastic woven bag wrapping
Steel end caps / bevel protectors
Anti-corrosion VCI paper wrapping
Open-top / flat-rack containers for oversize pipes
Special steel cradle for long pipes

🚢 Shipping Information

MOQ: 10 tons per size
Delivery: 20–40 days after deposit
Port: Tianjin / Xingang, China
Shipping: Bulk carrier / container / pipe carrier
Payment: T/T, L/C accepted
Insurance: CIF includes All Risk

💡 QA/QC: MTC per EN 10204 3.1/3.2, third-party inspection (SGS, BV, TUV, LR), 100% hydrostatic test, 100% UT + RT weld inspection, Charpy V-notch impact test, tensile & bend testing.

Manufacturing Process

JCOE (J-ing, C-ing, O-ing, Expanding) process for manufacturing large-diameter longitudinal submerged arc welded steel pipes with superior weld quality.

Raw Material Inspection

Inspect steel plate chemical composition, mechanical properties, surface quality and dimensional accuracy.

Plate Cutting & Blanking

Cut steel plates into specified size blanks according to production requirements.

Plate Edge Milling

Machine plate edges to standard welding groove for full penetration welding.

Plate Pre-bending

Pre-bend both plate edges to eliminate straight edge defects after forming.

JCO Forming

Press steel plate step by step into tubular blank through JCO forming process.

Pre-welding & Tack Welding

Fix pipe seam position with spot welding to ensure assembly stability.

Internal Submerged Arc Welding

Complete inner seam welding by submerged arc welding process with high penetration.

External Submerged Arc Welding

Weld outer pipe seam to form full-wall welded joint.

Weld Seam Inspection

Preliminarily check welding quality and appearance defects of weld seams.

Pipe Sizing & Straightening

Calibrate pipe diameter and correct pipe bending and ovality.

Pipe End Cutting to Fixed Length

Cut welded long pipes to standard fixed dimensions.

Pipe End Deburring

Remove sharp burrs and metal residues at pipe ends.

Ultrasonic Nondestructive Testing

Detect internal defects of weld seam and pipe body comprehensively.

X-ray Radiographic Inspection

Precisely inspect tiny welding defects for high-standard pipe quality.

Hydrostatic Pressure Test

Test pipe pressure resistance and weld tightness under rated water pressure.

Pipe End Facing & Chamfering

Machine flat pipe ends and process standard chamfers for installation.

Final Surface Inspection

Check overall pipe surface for scratches, pits and welding defects.

Pipe Marking

Print steel grade, specification, batch number and standard information.

Anti-rust Treatment (Optional)

Coat anti-rust oil or protective layer to prevent pipe corrosion.

Packaging & Stacking

Bundle qualified pipes and stack neatly in designated area.

Finished Product Storage & Delivery

Store qualified products and arrange delivery according to orders.

Applications

Where our products deliver proven performance across industries worldwide.

OIL & GAS

Long-Diameter High-Pressure Trunk Lines

LSAW (JCOE/UOE) pipe is the premium choice for large-diameter, high-pressure transmission pipelines — arctic, desert, and mountain routes — where superior weld toughness and low defect rates are non-negotiable.

✓ API 5L PSL2 X42–X100

OFFSHORE

Offshore & Submarine Pipelines

Longitudinal welds with excellent low-temperature toughness and full-body ultrasonic inspection make LSAW the default for offshore export lines, landfalls and deepwater projects.

✓ DNV-ST-F101 compliant options

STRUCTURAL

Critical Structural Columns

High-rise mega-columns, bridge arches, and offshore jacket legs use thick-wall LSAW for its uniform wall, straightness, and reliable weld properties under compression and bending.

✓ EN 10225 / EN 10219 thick-wall

ENERGY

Hydro & Penstock Applications

Thick-wall LSAW serves hydropower penstocks and surge lines, where high head pressures and site temperatures demand top-tier toughness and weld quality.

✓ Wall thickness to 40 mm+

SOUR

Sour Service Pipelines

HIC/SSC-tested LSAW in restricted-chemistry steels transports sour crude and natural gas, meeting NACE MR0175 / ISO 15156 material requirements.

✓ NACE MR0175 sour service

SPECIAL

Specialty & Custom Projects

Large diameters, extreme wall thicknesses, and special lengths beyond ERW and SSAW capability are rolled to order on LSAW lines, from wind tower sections to rammed pipe piles.

✓ Diameter 406–1422 mm, WT to 40 mm+

Frequently Asked Questions

What is LSAW steel pipe?＋

LSAW (Longitudinal Submerged Arc Welded) pipe is formed from a single steel plate pressed into a tube (JCOE or UOE process) and welded along one longitudinal seam — offering superior toughness for critical, high-pressure service.

What standards does your LSAW pipe comply with?＋

We produce to API 5L PSL2 (X42–X100), DNV-ST-F101, EN 10225, GB/T 9711 and ASTM A671/A672, with complete material traceability.

What diameter and wall thickness range is available?＋

Outside diameter 406 mm to 1422 mm (16"–56"), wall thickness 6.4 mm to 40 mm+, in grades from Gr.B to X100 including sour-service chemistries.

LSAW vs ERW vs SSAW — which should I choose?＋

Choose LSAW for the highest pressures, thick walls, low temperatures, and offshore/critical lines; ERW for small-to-medium diameters at moderate pressures; SSAW for large diameters at moderate pressures where cost matters.

What is the JCOE forming process?＋

JCOE progressively presses the plate edges (J), forms the middle (C), opens to an O-shape (O), then expands (E) the pipe — producing uniform geometry, low residual stress, and consistent wall thickness.

How is LSAW weld quality verified?＋

Double-sided submerged arc welding followed by 100% X-ray and ultrasonic inspection of weld and HAZ, hydrostatic testing of every joint, and mechanical testing including Charpy at design temperature.

Do you offer sour service (HIC/SSC) LSAW pipe?＋

Yes. Restricted-chemistry steels with HIC and SSC testing per NACE MR0175 / ISO 15156 are available for sour crude and natural gas transmission.

What is the minimum order quantity and lead time?＋

MOQ depends on diameter and plate availability — typically 100+ tons for special sizes. Lead time is usually 4–10 weeks. Contact us for a firm quotation.

Can you supply LSAW with anti-corrosion coating?＋

Yes — FBE, dual-FBE, 3PE/3PP, concrete weight coating, and internal linings, applied in-house with single-source responsibility.

What documentation do you provide?＋

EN 10204 3.1/3.2 certificates, full NDT records, hydro test data, Charpy/HIC/SSC reports where applicable, plus third-party inspection options (SGS, BV, TUV, DNV).