TMCP delivery economical HIC-resistance pipeline steel plate X65MS and manufacturing method thereof

Abstract

The invention discloses a TMCP delivery economical HIC-resistance pipeline steel plate X65MS and a manufacturing method thereof. The TMCP delivery economical HIC-resistance pipeline steel plate X65MScomprises chemical components including 0.06-0.10% of C, 0.3-0.4% of Si, less than or equal to 1.0% of Mn, less than or equal to 0.08% of Nb+Ti+V, 0.1-0.3% of Cr, less than or equal to 0.008% of P, less than or equal to 0.0008% of S, less than or equal to 0.002% of [N], less than or equal to 0.0010% of [O], less than or equal to 0.0001% of [H], and the balance Fe and inevitable impurities. A uniform polygonal ferritic structure is obtained. The preparation method comprises the technological steps of KR molten iron pretreatment, converter smelting, LF refining, RH vacuum degassing, continuous casting, continuous casting billet covering slow-cooling, continuous casting billet inspection and cleaning, casting billet heating, high-pressure water descaling, controlled rolling and controlled cooling, straightening and steel plate pile slow-cooling. Through the preparation method, production of the HIC-resistance pipeline steel plate X65MS with the economical components and HIC resistance isrealized.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a pipeline steel plate X65MS delivered by TMCP with more economical composition and HIC resistance and a manufacturing method thereof. Background technique [0002] At present, with the continuous exploitation of resources, there are more and more oil and gas resources containing corrosive media such as hydrogen sulfide, which are corrosive to the pipeline during the transportation process. If the conventional pipeline steel plate design is adopted, the safety of the pipeline will be seriously affected sex. In order to prevent cracking caused by hydrogen sulfide corrosion, HIC-resistant steel plates that can resist hydrogen sulfide gas corrosion are mostly used in the design. At present, the main steel grade used is BMS-X65MS, and the highest steel grade is X70MS. The higher the steel grade, the higher the strength , the greater the sensitivity of HIC, the steel type involved in...

AI Technical Summary

Problems solved by technology

[0006] For the anti-HIC pipeline steel plate X65MS delivered by TMCP, the use of precious alloy elements is saved through reasonable composition design to improve economy, and at the same time, the heating, rolling and cooling processes are precisely set to ensure the strength and HIC resistance of the steel plate. Focus on solving the technical problems of high manufacturing cost and unstable HIC performance of the HIC-resistant pipeline steel delivered by TMCP

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