Economical anti-HIC pipeline steel plate X52NS delivered in normalized state and manufacturing method for same

Abstract

The invention discloses an economical anti-HIC pipeline steel plate X52NS delivered in a normalized state. Chemical compositions are as follows: C <= 0.12%, Si 0.3 - 0.4; Mn <= 1.25%; Nb + Ti <= 0.03;P <= 0.008; S <= 0.0008; [N] <= 0.002,[O] <= 0.0010, [H] <= 0.0001, the remains are Fe, and unavoidable impurities; Cr, Ni, Mo, and Cu are not intentionally added to the chemical compositions; the steel plate is delivered in a normal state with ferrite-pearlite structure. The technical process comprises: KR melted iron pretreating, converting, LF refining, RH vacuum degassing, slab continuous casting, slow cooling, rolling, cooling, fine inspecting, performance testing, and packaging and storing. On the basis of this component design, the focus is on a design of a normalized process. By precisely controlling the temperature rise and the heat preservation process in the normalized process, the manufacturing method for the economical anti-HIC pipeline steel plate X52NS delivered in the normalized state is developed on the basis of ensuring the uniform intensity of the normalized steel plate and the anti-HIC performance.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a pipeline steel plate X52NS delivered in a normalized state with more economical composition and HIC resistance, and a manufacturing method thereof. Background technique [0002] With the continuous exploitation of oil and natural gas, more and more newly exploited resources contain corrosive media such as hydrogen sulfide, which has a significant impact on the service life of pipelines. At the same time, pipeline transportation is still the main transportation method for energy media such as oil and natural gas. Therefore, there is an increasing demand for pipeline steel plates resistant to hydrogen sulfide corrosion in the market. In some engineering designs, considering the uniformity and safety of the overall pipeline, the designer did not use the TMCP process, but specified the normalizing process to produce hydrogen sulfide-resistant pipeline steel plates. At present, th...

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Problems solved by technology

[0005] For the anti-HIC pipeline steel plate X52NS delivered by normalizing, the precious alloy elements are removed through reasonable composition design to improve the economy, and the normalizing process is precisely set to ensure the strength and HIC resistance of the steel plate, focusing on solving the current normalizing delivery High manufacturing cost of anti-HIC pipeline steel and technical problems of unstable HIC performance

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