API 5L GRB seamless and welded pipes are pipeline steel pipes manufactured according to the American Petroleum Institute (API) 5L standard. The steel grade is GRB (Grade B), which is a medium-strength pipeline steel. They are manufactured by hot rolling or cold drawing processes and are mainly used for long-distance transportation of fluids such as oil, natural gas, and water.
Api 5l Grade B Line Pipe Chemical Composition
| Chemical Composition of API 5L Grade B PSL1 Pipe | PSL2 | |||||||
|---|---|---|---|---|---|---|---|---|
|
Grade |
P (Max) |
Mn (Max.) |
C (Max) |
C (Max) |
S (Max) |
P (Max) |
Mn (Max) |
S (Max) |
|
B |
0.003 |
1.020 |
0.026 |
0.022 |
0.003 |
0.0025 |
1.030 |
0.0015 |
What is the tensile strength of API 5L Grade B?
Minimum 415 MPa
|
Tolerance on dimension |
|||||
|---|---|---|---|---|---|
|
Outside Diameter Tolerance |
Wall thickness Tolerance |
||||
|
A, B |
X42 ~ X70 |
||||
|
+0.41/-0.40 milimeter |
D<60.3 milimeter |
D<73 milimeter |
+20%/-12.5% |
D<73 milimeter |
+15%/-12.5% |
|
+0.75/-0.40 milimeter |
D>=60.3 milimeter |
D>=73 milimeter |
+15%/-12.5% |
D>=73 milimeter |
+15%/-12.5% |
|
Pipes Grade |
Seam of Welded Pipes |
Tensile Properties - B Pipes Body of SMLS and Welded Pipes PSL 1 |
||
|---|---|---|---|---|
|
Tensile Strength b |
Tensile Strength a |
Yield Strength a |
Elongation |
|
|
B |
60,200 |
60,200 |
35,500 |
c |
What is API 5L X42?
API 5L X42 steel pipe is a carbon steel pipe manufactured according to API Spec 5L standard, used for transporting natural gas, water, oil, and for pipelines in the petroleum industry, including low-pressure and medium-pressure vessels and boilers.
What is the difference between API 5L grade B and X42?
| Comparison Item | API 5L Grade B (PSL2) | API 5L X42 (PSL2) |
|---|---|---|
| ▸ Chemical Composition | ||
| Carbon (C) | ≤0.26% | ≤0.26% |
| Manganese (Mn) | ≤1.20% | ≤1.30% |
| Phosphorus (P) | ≤0.025% | ≤0.025% |
| Sulfur (S) | ≤0.015% | ≤0.015% |
| Carbon Equivalent (Ceq) | ≤0.43% | ≤0.43% |
| ▸ Mechanical Properties | ||
| Yield Strength (MPa) | ≥241 | ≥290 |
| Tensile Strength (MPa) | 414~758 | 414~758 |
| Yield-to-Tensile Ratio | ≤0.93 | ≤0.93 |
| Elongation (50mm gauge) | ≥21% | ≥21% |
| Impact Energy (-30°C) | ≥27J | ≥34J |
| Hardness (HV10) | ≤265 | ≤265 |
| ▸ Key Differences | ||
| Strength Grade | Entry-level (240 ksi) | Upgraded (290 ksi) |
| Pressure Range | ≤7.5 MPa | ≤10.3 MPa |
| Wall Thickness Economy | Baseline | 18% reduction |
