Main characteristics of API5L X42 large diameter spiral pipe line

API 5 l X42 pipeline steel is manufacture of petroleum, gas gathering and long distance pipe or coal, building materials, slurry pipeline, such as use of medium plate and steel coil is called steel for pipeline.
Commonly, it uses the thick plate made of thick wall straight seam welded pipe, the plate roll used in the production of straight seam welded pipe or spiral submerged arc welded pipe resistance.Domestic 700000 t/a diameter within 1800 mm of API 5 l X42 spiral steel pipe production capacity, in recent years has established the diameter straight seam within 1600 mm thick wall welded pipe production line
Modern pipeline belong to low carbon steel or low carbon microalloyed steel, is a high technology content and high value-added products, pipeline steel production used for metallurgy field for nearly 20 years of almost all new technology achievement.Current pipeline engineering is the development trend of large diameter and high pressure rich gas transportation, high cold and service environment of corrosion, the thick wall of seabed pipeline.Therefore the modern pipeline steel should have high strength, low BaoShen lattice effect, high toughness and resistance to brittle fracture, low welding carbon and good weldability, and resistance to HTC and H2S corrosion resistance.Optimal production strategy is progress of steel cleanliness and organization uniformity, C≤0．09％、S≤0．005％、P≤0．01％、O≤0．002％, and take the micro alloying, vacuum degassing + CaSi, light under the pressure of continuous casting process, multi-phase thermal mechanical rolling and multifunctional intermittent accelerated cooling process.Pipeline at home and abroad in the specification without pipeline steel toughness index, is only for the pipe specific requirements:
(1)the lowest use temperature (5 ℃) DWTT acuity 85% SA;
(2)the lowest use temperature (5 ℃) under the charpy impact absorbed energy acuity 145 j.
The current technology condition of pipeline steel widely used American petroleum institute standard APISpec 5L, but domestic specific projects or specific user's order more exacting technical conditions than API standard.