API 5L GRB seamless steel pipes are made of carbon steel, have good pressure resistance and corrosion resistance, and are suitable for long-distance transportation of fluids such as oil and natural gas.
Materials: Carbon content is controlled below 0.22%, manganese content is 1.2%-1.5%, and elements such as niobium and vanadium are added through micro-alloying to improve strength while ensuring weldability. Sulfur and phosphorus impurity content must be below 0.025% to ensure low-temperature toughness.
Manufacturing Process Requirements: High-frequency resistance welding (ERW) or submerged arc welding (SAW) processes are used. Welds must undergo 100% ultrasonic testing and X-ray inspection. The production line is equipped with online heat treatment equipment to eliminate residual welding stress.
Mechanical Property Standards: Yield strength ≥ 245 MPa, tensile strength 415-655 MPa, elongation not less than 23%.
What is API 5L Grade B used for
API 5L-B steel conforms to the API SPEC 5L standard and is a grade of pipeline steel, equivalent to L245. Its main applications are in oil and gas transportation projects such as oil pipelines and natural gas pipelines. Due to its excellent mechanical properties and corrosion resistance, it has broad application prospects in these fields.
Tolerances of Outside Diameter, Out of roundness and Wall thickness
|
OD Tolerance |
WT Tolerance |
||||
|---|---|---|---|---|---|
|
A, B |
X42 ~ X70 |
||||
|
D<60.3mm |
+0.41/-0.40mm |
D<73mm |
+20%/-12.5% |
D<73mm |
+15%/-12.5% |
|
D>=60.3mm |
+0.75/-0.40mm |
D>=73mm |
+15%/-12.5% |
D>=73mm |
+15%/-12.5% |
Equivalent Material of API 5L Grade B pipe
|
Standard |
SEAMLESS |
WELDED |
Other standards |
|---|---|---|---|
|
API 5L Gr B PSL1 Equivalent |
EN 10216-1 P265 |
EN 10217-1 P265 |
BS 3601 430 |
| API 5L Grade B PSL2 Equivalent |
EN 10216-1 P265 |
EN 10217-1 P265 |
BS 3601 430 |
API 5L Grade B pipe Factory
