L360M longitudinal seam steel pipe (L360M steel pipe implements standard GB T9711-PSL2 spot).
L360m longitudinal seam steel pipeClick on the avatar in the spot
L360M pipeline steel is currently a large amount of pipeline steel in the domestic market, this steel has been used in petroleum, chemical, electric power and other industries, such as the domestic North China Power Grid, Jiangsu Power Grid, as well as some foreign nuclear power plants and natural gas pipelines. It is characterized by high strength, good toughness, good corrosion resistance, and is about 20% stronger than similar domestic pipeline steel under the same specificationsGenerally, it is used as a material for pressure-bearing structural parts when producing high-pressure pipeline steel pipes in high-pressure pipeline steel pipe factories.
1. L360M pipeline steel is prone to cracks in welding. The main cause of cracks is that the welded joints cool down too quickly. Cold cracking occurs in the welding joint during the cooling process, resulting in fine cracks in the weld metal, and the crack source is mainly in the weld metal, and may also exist after welding.
L360M technical parameters.
1) Strength level: tensile strength 465 450 MPa (some manufacturers can provide higher tensile strength 450 MPa).
2) Yield strength: 360-440 MPa
3) Elongation: 45%.
4) Impact power: 35j;
5) Hardness: 185 HB
7) Heat treatment system: heating temperature 1220, heat preservation 1 2h, air cooling.
8) The end of the pipe is processed into an arc shape, and a groove is opened on the outer circle.
9) The welding rod adopts SZW EW45 and CSM series electrode, and the welding wire is Q345E and Q235E.
10) The pipeline steel is fixed welded as a whole, and the solution treatment temperature is 1050;Unequal three-sided fixed welding, there is a certain virtual welding phenomenon during welding, and it is required to preheat to 80 before welding.
But the intensity is higher. The ASME rated working pressure of L360m longitudinal seam steel pipe is usually 20% higher than that of welded steel pipe piles. Due to the lower risk of impurities at the joints, stainless steel seamless pipes are more expensive than welded pipes. Therefore, it also has a high resistance to corrosion or damage. Specifically, it is manifested in the following aspects: the raw material of L360M longitudinal seam steel pipe is round steel. Good round steel grades, especially L360M longitudinal seam steel pipe billet steel, have less impurities and good forging effect, so the yield will naturally be higher. The L360M longitudinal seam steel pipe is formed in one step during the rolling process. The processing of L360M longitudinal seam steel pipe is changed from solid round steel to hollow round bar. The process of piercing requires cutting and high temperatures. During the pickling process, wastewater and residue need to be treated. In the annealing process, natural gas is used in each process, which requires post-processing, which also consumes a lot of money. A welded pipe is a steel pipe made of steel plate or strip steel welded by crimping. Spiral welding and direct welding are generally used. The production process is simple, the production efficiency is high, the varieties and specifications are many, the equipment investment is less, and the production process is cheap.