In the process of using
API 5L X70 (L485) pipeline steel, in addition to high compressive strength, it also requires high low temperature toughness and excellent welding performance. Generally, medium and thick plates are used to make thick-walled longitudinally welded pipes, while API 5L X70 coils are used to produce longitudinally welded resistance welded pipes or submerged arc spiral welded pipes.
Modern pipeline steel is a low-carbon or carbon microalloyed steel, which is a product with high technical content and high added value. The production of pipeline steel has almost applied all the new technological achievements in the metallurgical field in the past 20 years. The development trend of pipeline engineering is large pipe diameter, high pressure rich gas transportation, high cold and corrosive service environment, and thicker submarine pipelines. Therefore, API 5L X70 (L485) pipeline steel should have high degree, low Bauschinger effect, high toughness and resistance to brittle fracture, low welding carbon content and good weldability, as well as resistance to HIC and H2S corrosion. An important trend in the development of oil and gas pipelines, especially natural gas pipelines, is the use of large-diameter and high-pressure transportation and the selection of high-grade
Steel pipes.
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