LSAW Steel Pipe

LSAW Steel Pipe (Longitudinally Submerged Arc Welding Pipe) , DSAW Steel Pipe

Straight Seam Submerged Arc Welded Steel Pipe


Whatsapp: +8613964179367


Product Description


Outside Diameter:Φ508mm- 1118mm (20″- 44″)

Wall Thickness: 6.0-25.4mm 1/4″-1″
Length: 9-12.3m (30′- 40′)
Grades: API 5L A-X90,GB/T9711 L190-L625


Outside Diameter:Φ406mm- 1626mm (16″ – 64″ )
Wall Thickness:6.0- 75mm (1/4″ – 3″ )
Length:3-12.5m ( 10′- 41′ )
Grades:API 5L A-X100, GB/T9711 L190-L690

Tolerance of Outside Diameter and Wall Thickness

Types Standard
SY/T5040-2000 SY/T5037-2000 SY/T9711.1-1977 ASTM A252 AWWA C200-97 API 5L PSL1
Tube end OD deviation ±0.5%D ±0.5%D -0.79mm~+2.38mm <±0.1%T <±0.1%T ±1.6mm
Wall thickness ±10.0%T D<508mm, ±12.5%T -8%T~+19.5%T <-12.5%T -8%T~+19.5%T 5.0mm<t<15.0mm, ±0.11<=”” p=””></t<15.0mm,>
D>508mm, ±10.0%T T≥15.0mm, ±1.5mm

Chemical Composition and Mechanical Properties of LSAW Steel Pipe


Standard Grade Chemical Composition(max)% Mechanical Properties(min)
C Mn Si S P Yield Strength


Tensile Strength


GB/T700-2006 A 0.22 1.4 0.35 0.050 0.045 235 370
B 0.2 1.4 0.35 0.045 0.045 235 370
C 0.17 1.4 0.35 0.040 0.040 235 370
D 0.17 1.4 0.35 0.035 0.035 235 370
GB/T1591-2009 A 0.2 1.7 0.5 0.035 0.035 345 470
B 0.2 1.7 0.5 0.030 0.030 345 470
C 0.2 1.7 0.5 0.030 0.030 345 470
BS En10025 S235JR 0.17 1.4 0.035 0.035 235 360
S275JR 0.21 1.5 0.035 0.035 275 410
S355JR 0.24 1.6 0.035 0.035 355 470
DIN 17100 ST37-2 0.2 0.050 0.050 225 340
ST44-2 0.21 0.050 0.050 265 410
ST52-3 0.2 1.6 0.55 0.040 0.040 345 490
JIS G3101 SS400 0.050 0.050 235 400
SS490 0.050 0.050 275 490
API 5L PSL1 A 0.22 0.9 0.03 0.03 210 335
B 0.26 1.2 0.03 0.03 245 415
X42 0.26 1.3 0.03 0.03 290 415
X46 0.26 1.4 0.03 0.03 320 435
X52 0.26 1.4 0.03 0.03 360 460
X56 0.26 1.1 0.03 0.03 390 490
X60 0.26 1.4 0.03 0.03 415 520
X65 0.26 1.45 0.03 0.03 450 535
X70 0.26 1.65 0.03 0.03 585 570


LSAW Steel Pipe Manufacturing Process:

LSAW steel pipe(Longitudinally Submerged Arc Welding abbreviated as LSAW) is a professional expression term for LSAW steel pipe. It uses a single medium and thick plate as the raw material, and the steel plate is pressed (rolled) into a tube blank in a mold or a forming machine. The pipe is produced by submerged arc welding and expanded diameter.

UOE LSAW pipe forming process:
The three main forming processes of UOE LSAW steel pipe forming process include: steel plate pre-bending, U forming and O forming. Each process adopts a dedicated forming press to complete the three processes of pre-bending the edge of the steel plate, U forming and O forming in sequence to deform the steel plate into a circular tube.

JCOE LSAW pipe forming process:
Forming: After several steps of stamping on the JCO forming machine, first half of the steel plate is pressed into a “J” shape, then the other half of the steel plate is pressed into a “J” to form a “C” shape, and finally pressurized from the middle to form An open “O”-shaped tube blank is formed.

Tests of LSAW steel pipe
Chemical Component Analysis
Mechanical Properties – Elongation, Yield Strength, Ultimate Tensile Strength
Technical Properties – DWT Test, Impact Test, Blow Test, Flattening Test
X-ray Test
Exterior Size Inspection
Hydrostatic Test
UT Test

Transportation of LSAW steel pipe
When transporting, loading and unloading lsaw welded pipes, special hoisting and transportation tools should be used to avoid scratching the surface.

Production equipment of LSAW steel pipe

Plate edge milling machine
The milling machine mills the two sides of the plate to exacting standards in order to meet width, edging and groove shape specifications.

Edge crimping machine
The crimping machine crimps the edges of the plate to form the required curvature.

Tack welding machine
The two edges of the open seam pipe are brought together by the tack welding machine. then welded by the tack welder using a metal active – gas arc welding(“MAG” )process.

Forming machine
Utilizes the “JCO” process to bend and form the crimped steel plate into a steel pipe.

Interior welding machine
The interior longitudinal seam of the pipe is welded from the inside by fixing 4 welding heads while moving pipe and using submerged-arc welding process.

End facing machine
The machine levels the pipe end with rotating cutter heads to ensure that required groove and edge specifications are met.

Hydrostatic tester
Using end face sealing technology eliminates blind zones during hydrostatic testing. The tester is also equipped with automatic recording and storing functions.

Expanding machine
The pipe is subjected to full-length expansion to increase the precision of the pipe dimensions and to improve the internal stress distribution.

Automated ultrasonic testing equipment
The superiority of phased arrayultra sonic technology:
(1 )Adopting electron control method for fast linear scanning or sector scanning without moving probe or moving less. thus greatlyim prove detection efficiency.
(2)Controlting the sound beam by setting detection angles, its good sound beam reachability can enhances reliability and accuracy of detection.
(3) Dynamic control the deflection and focus of sound beam realizes the detection of pipes with different wall thickness without replacing probes.

Our advantage

Welcome know more about our company.
1.15+rich experiece in steel pipe, sheet,coil and all kinds of bars;
2.The company was awarded the gold product by Ali and vertified by sgs certification;
3.Competive prices with cusomer oriednted
4.Exported to more than 100 countries;
5.Fast delivery in 5 days
Any questions, pls feel free to let me know and I will reply you in 2 hours;
Looking forward to your reply!

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