Welded Pipes (ERW, LSAW, SSAW)

We are a professional supplier for and tubes, all grades and dimensions to the oil and gas, petrochemical, Chemical and Power industries.

We can supply all kinds of welded pipes (ERW, , SSAW), we have a huge range of different welded pipes constantly on stock.

ERW (Electric Resistance Welded):

ERW Steel Pipe-Electric Resistance is made of hot-rolled steel coils/sheets that have been put in a process known as cold roll forming. The obvious advantage of ERW steel pipe compared to is the uniform wall thickness. According to API standard or GB/T9711.1 standard, both ends of the steel pipe are beveled and length can be fixed as required

Low Pressure Fluid (water, oil, gas and other liquid) transmission Stress & pressure structural parts and spare parts
Standard & Steel grade:
Line Pipe: API 5L PSL1/PSL2,GR.B-X70,GB/T 9711-1,GB/T9711-2,ISO 3138-1,ISO 3192-2
Structural Pipe: ASTM A53 GR.A/B/C,EN 10219,EN 10217,JIS G3444,AS 1163

LSAW (Longitudinal Submerged Arc-Welded):

LSAW Steel Pipe refers to Longitudinal Submerged-Arc Welded Steel Pipe, which is made of hot-rolled steel plate or coils, LSAW steel pipe always goes to the big-sized welded pipe, which can’t be manufactured by electric resistance welding technique (ERW)

Low Pressure Fluid (water, oil, gas and other liquid) transmission Stress Structural support in industrial construction (bridge building, pile driving, billboard support ,…etc)
Standard & Steel grade:
Line Pipe: API 5L PSL1/PSL2,GR.B/X42/X46/X52/X56/X60/X65/X70
Low pressure fluid conveying Pipe: GB/T3019 Q195/Q215/Q235/Q275/Q295/Q345/IS 3589 Fe330/Fe410/Fe450
Structural Pipe: EN10219 S235JRH/S275JOH/S275J2H/S355JOH/S355J2H
EN10217, ASTM A53 GR.A/B/C, ASTM A252 GR.1/2/3

ASTM A572 GR.42/50/55/60/65,JIS A5525 SKK400/SKK490

SSAW (Spiral Submerged Arc- Welded):

Spiral submerged arc welding(SSAW) is its forward direction and forming tube centerline hose reel molding angle (adjustable), side molding edge welding and weld them into a spiral.

SSAW pipe is made of hot rolled coiled steel by automatic submerged arc weld under normal atmospheric temperature.

These pipes mainly used in petroleum and natural gas industry to transport flammable and non-flammable liquid and steel construction
Standard & Steel grade:
Line Pipe: API 5L PSL1/PSL2,GR.B/X42/X46/X52/X56/X60/X65/X70
Structural Pipe: ASTM A53 GR.A/B/C,ASTM A252 GR.1/2/3,EN 10219 S275,S275JR,EN 10217 S355JR/S355JOH/S355J2H,
JIS A5525 SKK400/SKK490,BS 4360 GR.43/50,AWWAC200

Compare between API 5L PSL1 & PSL2 steel pipelines

API 5L line pipe (Seamless and Welded Pipes) of all grades have PSL1 and PSL2 two product specifications, they are different on chemical composition, manufacturing processes, mechanical strength, heat treatment, test records, traceability etc.

Line pipes in API 5L PSL2 is higher than PSL1

PSL is the short name of product standard level. The product standard level of line pipe has PSL1 and PSL2, also we could say the quality standard divided in PSL1 and PSL2. PSL2 is higher than PSL1, not only the inspection standard is different, also the chemical property, mechanical strength standards are different. So when place the order for the API 5L line pipe, there should be stated clearly for the size, grades these general specification, also have to clarify the production standard level, PSL1 or PSL2.
PSL2 is more strictly than PSL1 on the chemical properties, tensile strength, non-destructive test, and impact test.

Different impact test methods for PSL1 and PSL2

API 5L PSL1 steel line pipe not required to do the impact test.
For API 5L PSL2 steel line pipe, except Grade X80, all the other grades of API 5L line pipe required the impact test at temperature of 0℃. The average value of Akv: longitudinal direction≥41J, transverse direction≥27J.
For API 5L Grade X80 PSL2 line pipe, at 0℃ for all the size, impact test the Akv average value: longitudinal direction≥101J, transverse direction≥68J.

Different hydraulic test for API 5L line pipe in PSL1 and PSL2

For API 5L PSL2 line pipe shall perform the hydraulic test for each single pipe, and in the API standard specification not permit to have Non-destructive test replace the hydraulic test, this also is a big difference between Chinese standard and API 5L standard. For PSL1 not required Non-destructive test, for PSL2 shall do the Non-destructive test for each single pipe.

Different chemical composition for API 5L line pipe in PSL1 and PSL2

Chemical composition and mechanical strength is also different between API 5L PSL1 line pipe and API 5L PSL2 line pipe. For the detailed specification as below. API 5L PSL2 have restrictions with the carbon equivalent content, where for the carbon mass fraction greater than 0.12%, and equal or less than 0.12%. Different CEQ shall be applied. For line pipe in PSL2 tensile strength have maximum limits. More info please review API 5L Specification part 9.2 and 9.3.

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