API 5L X42 pipeline steel refers to a type of steel with special requirements used to transport petroleum du, natural gas and other pipelines. Depending on the thickness and subsequent formation, API 5L X42 pipeline steel plate can be produced by hot tandem rolling mills, steckel mills or medium and heavy plate rolling mills. Large-diameter
Steel pipes are formed by spiral welding or UOE straight seam welding.
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, the current performance requirements for API 5L X42 pipeline steel plate mainly include the following aspects:
(1) High strength. The strength indexes of pipeline steel mainly include tensile strength and yield strength. While requiring high strength, the yield strength ratio (ratio of yield strength to tensile strength) of pipeline steel is also required, generally within the range of 0.85 to 0.93.
(2) High impact toughness. Pipeline steel requires that the material should have sufficiently high impact toughness (crack initiation, crack arrest toughness). For the base material, when the toughness value of the material meets the requirements of crack arrest, its toughness can generally meet the requirements of preventing cracking.
(3) Low ductile brittle transition temperature. Severe geographical and climatic conditions require pipeline steel to have a sufficiently low ductile brittle transition temperature. Shear area has become the main control index to prevent brittle failure of pipelines. The general specification requires that the shear area of the specimen fracture at the lowest operating temperature F is not less than 85%.
(4) Excellent resistance to hydrogen induced cracking (HIC) and resistance to sulfide stress corrosion cracking (SSCC).
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