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Longitudinal Submerged Arc Welded(LSAW) Steel Pipe is manufactured by taking thick steel plate as raw material, forming the plate into a cylindrical shape via edge milling, pre-bending, plate forming, joint squeezing, then adopting double-sided submerged arc welding technology for longitudinal seam welding.It is a heavy-caliber, heavy-wall welded steel pipe with strict production standards, stable weld performance, high overall mechanical properties. Widely recognized as the preferred pipe for large-diameter high-pressure oil & gas transmission, municipal engineering, and offshore engineering.
2.1 Raw material is whole steel plate, no strip lap joint, uniform material performance.
2.2 Adopt double-sided submerged arc automatic welding, deep weld penetration, flawless weld seam.
2.3 High dimensional accuracy, roundness & straightness are far better than SSAW spiral pipe.
2.4 Wide range of outer diameter and wall thickness, suitable for super large caliber and heavy wall thickness requirements.
2.5 Low residual stress, good pressure resistance, impact resistance and low-temperature toughness.
2.6 Can be made into anti-corrosion coating: 3PE, 2PE, FBE epoxy powder, cement mortar lining, galvanized etc.
2.7 Strict non-destructive testing: X-ray, ultrasonic, hydrostatic pressure full inspection.
Outer Diameter (OD) | 406.4mm–1219mm |
Wall Thickness (WT) | 8mm-40mm |
Standard Length | 6m/12m |
Steel Grade | GRADE B,X42–X70,S275-S460,L245-L485 |
Execution Standards | API 5L,ASTM A53,ASTM A572,EN10219,EN10210,EN10217 |
Welding Process | Double-sided submerged arc longitudinal welding |
Testing Method | Hydrostatic test, Ultrasonic testing, X-ray flaw detection, Mechanical property test |
Surface & Coating | Black painted, Varnish, Galvanized, 3PE/2PE/FBE anti-corrosion, Cement mortar lining |
End Type | Plain end, Beveled end, Grooved end, Flange connection |
4.1 Super high pressure bearing capacity
Integral steel plate forming, stable weld structure, suitable for high-pressure long-distance pipeline projects.
4.2 Excellent low-temperature performance
Available in low-temperature grades Q355D/E, API X65/X70, adapt to cold region and offshore harsh environment.
4.3 High safety & reliability
No spiral weld stress concentration; longitudinal weld is short and easy for 100% nondestructive testing, low leakage risk.
4.4 Large specification coverage
Can produce large diameter + heavy wall pipes that HFW and SSAW cannot achieve.
4.5 Good construction adaptability
High roundness and straightness, easy for on-site docking, welding and installation.
4.6 Long service life
With professional external & internal anti-corrosion treatment, service life up to 30–50 years.
5.1 Oil & Gas Pipeline:Long-distance crude oil, natural gas, refined oil transmission trunk lines, oilfield gathering and transportation pipelines.
5.2 Offshore & Marine Engineering:Offshore platform jacket pipe, marine dredging pipeline, submarine pipeline riser.
5.3 Municipal Engineering:Urban large-diameter water supply and drainage pipeline, urban heating pipeline, underground comprehensive pipe gallery.
5.4 Bridge & Steel Structure:Bridge pile foundation pipe, port wharf piling pipe,high-rise building steel structure column pipe.
5.5 Chemical & Power Industry:Chemical medium conveying pipeline, power plant cooling water pipeline, thermal engineering pipeline.
5.6 Hydraulic Engineering:Reservoir water delivery, river diversion, water conservancy hub pressure pipeline.
