Requirements for L245 pipeline steel pipe
In order to ensure that L245 pipeline steel pipe has high fatigue strength, compressive strength, surface hardness and long service life, various non-metallic inclusions such as oxide inclusions, sulfide inclusions, and point inclusions in the steel should be strictly controlled; The non-uniformity of various carbides in steel (such as carbide liquid precipitation, strip carbides, ribbon carbides and network carbides, etc.) should be controlled within the level.
The thickness of the decarburized layer on the surface of the finished bearing steel after hot processing should be reduced as much as possible; the macroscopic low-magnification structure of the steel should be small, that is, the level of general looseness, loose center, and segregation should be small, subcutaneous bubbles, shrinkage holes, inclusions and cracks are not allowed.
The annealed steel is required to have a uniform and fine spherical pearlite structure.