Hot rolled steel plate with excellent low-temperature toughness for thick submerged pipeline and production method of hot rolled steel plate

Abstract

The invention provides a hot rolled steel plate with excellent low-temperature toughness for a thick submerged pipeline and a production method of the hot rolled steel plate. The hot rolled steel plate comprises the following chemical components by weight percentage: 0.02%-0.07% of C, 0.15%-0.40% of Si, 1.0%-1.70% of Mn, less than or equal to 0.020% of P, less than or equal to 0.003% of S, less than or equal to 0.06% of Nb, less than or equal to 0.025% of Ti, less than or equal to 0.06% of V, less than or equal to 0.20% of Mo, less than or equal to 0.25% of Cu, 0.10%-0.30% of Ni, less than orequal to 0.25% of Cr, less than or equal to 0.008% of N, 0.010%-0.040% of Al, more than or equal to 2 of Al/N and the rest Fe and inevitable impurities. According to the steel for the submerged pipeline with the thickness being over 28mm, disclosed by the invention, the transversal and longitudinal bending strength can reach over 480MPa or 510MPa, the transversal and longitudinal tensile strengthcan reach over 560MPa or 600 MPa, the transversal impact toughness at the temperature of 60 DEG below zero is larger than or equal to 400 J, the transversal DWTT (Drop-Weight Tear Test) shearing areaat the temperature of 25 DEG C below zero is larger than or equal to 85%, simultaneously, the corrosion resistant of the steel plate is excellent, and the result of a 96-hour HIC (Hydrogen Induced Cracking) test conforms to the requirements of the standard 0284 of the NACE (National Association of Corrosion Engineers). The hot rolled steel plate is suitable to be as a raw material for manufacturing a pipeline for submerged oil and gas transmission.

Description

technical field [0001] The invention belongs to the technical field of low-carbon micro-alloy steel, and in particular relates to a hot-rolled steel plate for thick-spec submarine pipelines with excellent low-temperature toughness and a production method thereof. Background technique [0002] With the rapid development of economy and society, the world's demand for oil and natural gas is increasing day by day; the seabed is rich in oil and gas resources, accounting for more than 1 / 3 of the world's total oil and gas resources, and most of them are located in deep sea areas. In recent years, countries have paid more and more attention to the exploration and exploitation of seabed resources. The construction and development of submarine oil and gas transmission pipelines have been rapid, and the demand for steel for submarine pipelines is increasing. On the other hand, for the sake of safety and sustainability, submarine pipelines must have excellent strength, weldability, corr...

AI Technical Summary

Problems solved by technology

Therefore, the existing technology is still insufficient in the research of steel for submarine pipelines with thick gauge, low temperature toughness and excellent corrosion resistance.

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