API & ASTM Carbon Steel Plate


Octal supplies pipeline steel plate (steel coil) in API 5L and API 5CT. Applied for manufacturing line pipes, casing and tubing.

What is pipeline steel plate (steel coil)

As we know line pipe or casing and tubing have two different manufacturing types, seamless and welded. So pipeline steel plate is used to make welded line pipe, including ERW, LSAW, SSAW welding processes. Further more, casing and tubing in API 5CT standard could also be made in welded ERW type, so pipeline steel plate and coils also covers these pipes. (But in most cases, casing and tubing are required in seamless types.)

Why we use pipeline steel plate for making pipes

With the developed market needs for oil and gas energy, the heavy and large diameters line pipes are required more and more in the pipeline transmission systems. But seamless pipe could not be manufactured more than 40 inch diameters (generally OD is below 20”). So in this situation, pipeline steel plate is coming up and has been taken as the raw material for making API 5L line pipes. Same with pipes, There are also have grades from B, X42, X46, X52, X56, X60, X70, in PSL1 and PSL2 levels of pipeline steel plate.

Pipeline steel plate and coils materials in Carbon steel

Through the heat analysis of API 5L pipes, we could find out that the steel plate for making oil and gas line pipe belongs to carbon steel plate.

So what is carbon steel plate? To be simple, carbon steel plate is the steel that didn’t contain any alloy steel elements. And pipeline steel plate is as one of the low carbon steel plate. Which the content value not exceed 0.26%. (When referring pipeline steel plate for sour services the carbon is less than general pipeline steel)

Different types of plates and their usage

Meanwhile, we would like to introduce all types of steel plate for sale.

Steel Plate Types for sale

Other than pipeline steel, steel plate also included below types and industries.

Structural plates
Hull structural plate
Vessel Plate
Plate for High Pressure vessel
Boiler plate
Shipbuilding Steel Plate
Pipeline Steel Plate (API Steel Plate) / Pipeline Steel Coils (API Steel Coil)
Cold Rolled plates and coils
Stainless Steel Plate/ Stainless Steel Coil

Standards and grades we supply

Octal offers pipeline steel plate for sale as below ranges:

API Steel Plate and Coils:
API 5L Grade B to Grade 80 (PSL1 & PSL2) steel plate and coils (For manufacturing oil and gas pipes).
API 5CT J55/K55, N80-1 and N80Q hot rolled steel plate coils

Also we supply steel plate for other industries and standards:

Boiler/Vessel (carbon) plates as below:
a. ASTM A537 CL1/ CL2/ CL3
b. ASTM A 516 GR60/ GR70
c. ASTM A 515 GR60/ 70
d. ASTM A 204 GR.A/B/C
e. ASTM A572 GR50, ASTM A572 GR60
f. ASTM A573 GR58, ASTM A573 GR65/Gr70
g. ASTM A737 GR58/ GR65/ GR70
h. ASTM A738 GR.A/ B/ C/ D/ E

Construction carbon Steel Plates:


Key notes to manufacturing pipeline steel plate

We have to perform enough tests to verify the pipeline steel plate material complied to API 5L standard. So below inspection methods should be done in manufacturing processes.

Hot rolling processes in API 5L pipeline standard
Impacting test
UT (Ultrasonic test and examination)
DWTT (Drop weight test)
Hardness inspection

Chemical and mechanical properties for pipeline steel

We could find details specifications from API SPEC 5L, but generally for PSL1 pipe (up to X70) is C Maximum 0.26, Mn Max 1.2% (to 1.45% for higher grade MX is higher), P and S shall be less than 0.030%.

API, ASTM Carbon Pipeline Steel Plate Sizes

Thickness: 0.4mm to 80mm
Width: 1000mm to 3400mm
Length: to 18m, customized length
Further processing: Flame Cutting SteelLaser Cut SteelWaterjet cutting sheet steelPlasma Cutting Services, Oil and Gas tanks making.

Sourcing with all the famous steel plate manufacturers in China, Octal is engaged on providing the high quality and best price for the API steel plate for pipeline systems.

Applications for API, ASTM Steel Plate

API steel plate is for manufacturing large diameters welded line pipe for the pipelines, welding process including ERW, LSAW, and SSAW, depending on the different welding process, the raw material will be in rectangular steel plate, steel sheet, or be in steel coil.

Besides of the application for the API 5L Plate, steel plates with different material also have been widely applied in oil and gas industries, Construction, Structural, Vessel, Tank, Boiler, Shipbuilding, Machinery manufacturing.


Tel:+86 3552087889
Fax:+86 3552087889
Mobile:+86 18636537776