API 5L PSL 1 Grade B is commonly used in steel pipe manufacturing. We could manufacturer & supply steel pipe in steel grade B. That is to say, we are Grade B LSAW steel pipe manufacturer. Let’s see the API 5L PSL 1 Grade B Chemical composition and mechanics capability below first:
Grade B in API 5L PSL 1
Chemical Composition (%)
- a. Cu max. is 0.50%; Maximum. Ni 0.50%; Cr equal or less than 0.50%; and Mo not more than 0.15%
- b. For each reduction of 0.01% below the specified max. concentration for carbon, an increase of 0.05% above the specified max. concentration for Mn is permissible, up to a max. of 1.65% for grades≥B, but above Grade X52; up to a max. of 1.75% for grades>X52, but<X70; and up to a maximum of 2.00% for X70.
- c. Unless otherwise agreed NB+V equal or under 0.06%.
- d. Nb+V+Ti not more than 0.15%.
- e. Unless otherwise agreed.
- f. Unless otherwise agreed, NB+V+Ti maxmimum is 0.15%.
- g. No deliberate addition of B is permitted and the residual B largest number is 0.001%.
Mechanics Capability
| Pipe Body | Weld Seam | ||
| Yield Strength | Tensile Strength | Elongation | Tensile Strength |
| min. (MPa) | minimum. (MPa) | % | min. (MPa) |
| 245 | 415 | c | 415 |
- Firstly, a for intermediate grade, the difference between the specified minimum tensile strength and the specified minimum yield for the pipe body shall be as given for the next higher grade.
- Secondly, b for the intermediate grades, the specified minimum tensile strength for the weld seam shall be the same as determined for the body using footnote a.
- Thirdly, c the specified minimum elongation, Af, expressed in percent and rounded to the nearest percent, shall be determined using the following equation:
Moreover, Where C is 1940 for calculation using Si units and 625000 for calculation using USC units
Further, Axc is the applicable tensile test piece cross-sectional area. expressed in square millimeters (square inches), as follows
- Firstly, for circular cross-section test pieces, 130mm2 (0.20-in2) for 12.7mm (0.500-in) and 8.9mm (0.350-in) diameter test pieces; And 65mm2 (0.10-in2) for 6.4 mm (0.250-in) diameter test pieces.
- Secondly, for full-section test pieces, the lesser of a) 485mm2 (0.75-in2) and b) the cross-sectional area of the test piece, derived using the specified outside diameter and the specified wall thickness of the pipe, rounded to the nearest 10mm2 (0.10-in2)
- Thirdly, for strip test pieces, the lesser of a) 485mm2 (0.75-in2) and b) the cross-sectional area of the test piece, derived using the specified width of the test piece and the specified wall thickness of the pipe, rounded to the nearest 10mm2 (0.10-in2)
in addition, U is the specified minimum tensile strength, expressed in megapascals (pounds per square inch)
Differences between API 5L PSL 1 and PSL 2
Above all, in API 5L Specification, there are two product levels (PSL 1 and PSL 2) of seamless and welded steel pipe. But, Level PSL 1 is a standard quality for line pipe. While level PSL 2 contains extra requirements. Such as chemical, mechanical properties, and testing requirements.
When we use a pipeline in the transportation of petroleum and natural gas. However, In Annex H, it indicated the material used in a sour service application. On the other hand, if for offshore service application, refers to Annex J in API 5L 45th Edition.
Ingots, blooms, billets, coils or plates used for the manufacture of pipe. It shall make via basic oxygen, electric furnace. Or open hearth in combination with a ladle refining process. However, for PSL2, the steel should kill. And meanwhile the steel will melt according to a fine grain practice. Most important, the coil or plate used for PSL2 pipe shall not contain any repair welds.
During the description in API 5L Specification. Steel Grades covered by this specification are A25, A, B ( and the following “X” Grades). The two-digit numbers following “X” indicates the Min. Yield Strength (in 000’s psi) of pipe produced to this grade.
To sum up, Winsteel can produce a full range of API 5L PSL-1 & PSL-2 line pipe in welded steel pipe (LSAW).