Economical H2S corrosion-resistant normalized pipeline steel and production method

Abstract

The invention discloses economical H2S corrosion-resistant normalized pipeline steel. The economical H2S corrosion-resistant normalized pipeline steel comprises the following chemical components in percentage by weight (wt%): 0.04-0.07% of C, 0.10-0.20% of Si, 0.7-0.9% of Mn, P not more than 0.01%, S not more than 0.002%, 0.06-0.12% of Nb, 0.04-0.07% of V, B not more than 0.0005, and RE not more than 0.0005. A production method comprises the production steps of casting blank heating, rough rolling, finish rolling, cooling, coiling and normalization. Besides of guaranteeing use mechanical performance and excellent weldability, the hydrogen sulfide corrosion resistance is excellent; cracks are not observed under the condition of the loading load being 0.80*actual yield strength load; the alloy cost is simple; and the cost can be reduced by 20% or above.

Description

technical field [0001] The invention relates to a pipeline steel and a production method, in particular to a H-resistant 2 A normalized pipeline steel with excellent corrosion performance and a production method thereof. Background technique [0002] Oil and natural gas are important energy sources for the development of the national economy, and their proportions in energy consumption are increasing day by day. At present, pipeline transportation is still the most economical, safe and efficient long-distance transportation method for oil and natural gas. However, with the depletion of easy-to-exploit oil and natural gas resources, H 2 The development of natural gas with high S content is increasing. [0003] h 2 S is one of the most corrosive and harmful media in oil and gas. When pipeline steel is exposed to moisture containing H 2 When in the conveying medium of S, the material is very prone to H 2 S acid corrosion, causing sudden failure of the delivery pipeline, ...

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Problems solved by technology

[0005] After searching, before the present invention, the Chinese patent application numbers are CN201010235925.6, CN201510297590.3, CN20160419909.X, CN2012101168133.0, CN201410233997.5 documents, the involved normalizing pipeline steel chemical composition is low C Or the composition system of medium C + medium Mn, and adding an appropriate amount of precious alloys such as Cr and Ni at the same time, is not economical and does not have corrosion resistance

[0006] Chinese patent application numbers are CN201210271608.9, CN201610025494.8, CN201310146465.3, CN201010130911.8, CN201410130811.3 documents, the involved normalizing pipeline steel adopts the composition system of Cu+Cr+Mo+Ni or high Cr, not economical

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