L415M straight seam steel pipe is made of L415 steel plate or strip steel. Production method: ERW straight seam electric resistance welded steel pipe, LSAW straight seam submerged arc welded steel pipe.
1.L415M straight seam steel pipe product implementation standard: GB/T9711. PSL1, PSL2 steel pipe for oil and gas industry pipeline transportation system.
2. Product specifications of L415M straight seam steel pipe: outer diameter 76mm~1420mm, wall thickness 2mm~80mm.
3. Chemical composition of L415M straight seam steel pipe: carbon: ≤0.12, silicon: ≤0.45, manganese ≤1.60, phosphorus: ≤0.025, sulfur: ≤0.015
4. Mechanical properties of L415M straight seam steel pipe: yield 415mpa~565mpa, tensile strength: 520mpa~760mpa, yield ratio 0.93, weld tensile strength ≥520mpa.
Tensile test specimen
The cutting of plate specimens representing the full wall thickness of the steel pipe shall comply with ISO6892-1 or ASTMA370 requirements as shown in Figure 5. The standard sampling position shall be selected along the length direction of the steel strip (coil)/steel plate by the documented practice. For hot-worked and heat-treated seamless pipes, transverse specimens shall be round ladder specimens and shall be taken from unflattened test blocks. For other steel pipes, transverse specimens can be either plate specimens or round bar specimens. Plate specimens shall be taken from flattened test blocks, while round bar specimens shall be taken from unflattened test blocks. The specimens shall be flattened according to documented procedures.
The diameter of round ladder specimens for transverse tensile tests shall comply with the provisions of Table 21, except that the manufacturer may choose to use adjacent larger diameter specimens. For longitudinal tensile tests on steel pipes with a wall thickness of ≥19.0mm (0.748in), the diameter of the round specimen shall be 12.7mm (0.500in). For steel pipe tests with a D of D~219.1mm (8.625in), the manufacturer may choose to use full-section longitudinal specimens. If agreed, expansion ring specimens may be used to determine the transverse yield strength. Welds may be ground flat and local imperfections may be removed. In addition to ISO148-1 and the required hammer radius (2mm or 8mm) specified in the order contract, the specimen preparation for the CVN impact test shall comply with the provisions of ASTMA370. The notch axis shall be perpendicular to the surface of the steel pipe.
To ensure that the impact test notch of the steel pipe weld and HAZ is opened at the appropriate position, the specimen shall be corroded before opening the notch. When preparing the weld specimens of submerged arc welding (SAW) and combination welding (COW) pipes, the axis of the notch shall be located at or as close as possible to the center line of the outer weld bead shown. The sampling shall be as close to the outer diameter surface of the steel pipe as possible. When preparing the heat-affected zone (HAZ) specimens of submerged arc welding (SAW) and combination welding (COW) pipes, the axis of the notch shall be connected to the fusion line of the outer weld bead as much as possible. The sampling shall be as close to the outer diameter surface of the steel pipe as possible. When preparing the weld specimens of high frequency welding (HFW) pipes, the axis of the notch shall be located at or as close as possible to the weld line. If the absorbed energy is expected to exceed 80% of the full scale of the impact tester, the adjacent smaller-size specimen may be used. In addition, the size, orientation, and source of the specimen shall be by the provisions of the table. Note: Steel pipes with a combination of specified outer diameter and specified wall thickness (size) not included in Table 22 do not need to be subjected to CVN impact testing.
Post time: May-27-2025