LSAW (Longitudinal submerge arc welding) is a type of SAW pipe made of steel plates that were hot rolled by JCOE or UOE forming technology. JCOE technology represents the shaping and forming processes involved during manufacturing as well as the inner and outer welding and cold expansion carried out after welding.

Steel pipes are mainly produced by two different manufacturing methods, namely welded pipes or seamless pipes. LSAW – longitudinal submerged arc welding is a special welding technique used in the production of welded pipes, LSAW is usually the most economical solution when operating conditions require high wall thickness due to high internal or external pressure.

Grades of LSAW Steel Pipe:

For pipeline: API 5L GR A, GR.B, X42, X45, X50, X60, X60, X65, X70, X80

For piles: ASTM A252 GR 1, GR 2, GR 3

ASTM A53: GR A, GR B, GR C, GR D
BS 4360: Grade 43, Grade 50
EN 10219/10210: S235JR, S275JR, S355JRH, S355J2H

EN 10217: S235JR, S275JR, S355JRH/J2H

Application of LSAW Steel Pipe:
Used for oil/gas/water
Transmission
Engineering
Offshore projects.

When building high-strength, high-toughness, high-quality long-distance oil and gas pipelines, the steel pipes required are mostly large-diameter thick-walled straight seam submerged arc welded pipes. According to API standards, in large oil and gas pipelines, when passing through Class 1 and Class 2 areas such as high-cold areas, seabeds, and densely populated urban areas, straight seam submerged arc welded pipes are the only designated applicable pipe type.

Advantages of LSAW Steel Pipes:
1) High production efficiency: Compared with traditional long welded pipes, LSAW straight seam welded pipes have higher production efficiency.
2) Stable welding quality: The use of submerged arc welding technology can ensure the stability of welding quality.
3) High weld quality: The quality of the weld is high and can meet higher requirements.
4) Suitable for large-diameter welded pipes: LSAW straight seam welded pipes are suitable for the manufacture of large-diameter pipes.
5) Simple process control: Compared with other welding methods, the process control of LSAW straight seam welded pipes is relatively simple.