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Preparation method of rare earth-containing seamless steel pipe for h2s corrosion resistant pipeline

A technology for seamless steel pipes and pipelines, which is applied in the field of preparation of seamless steel pipes for H2S corrosion-resistant pipelines containing rare earth, can solve the problems of high impurity element content, low melting point, difficulty in smelting and rolling, etc., and achieves excellent anti-HIS performance, The effect of excellent SCC performance

Active Publication Date: 2016-04-20
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology

[0003] Chinese invention patent CN1351189A discloses a gas transmission pipeline steel with ultra-low carbon, high toughness and hydrogen sulfide resistance, but the content of impurity element Cu (wt%≤0.20%) is high
This is a deficiency that cannot be overcome by the process of using scrap steel as raw material for electric furnace production. Due to the low melting point of Cu element, this will cause certain difficulties in the smelting and rolling process.

Method used

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  • Preparation method of rare earth-containing seamless steel pipe for h2s corrosion resistant pipeline
  • Preparation method of rare earth-containing seamless steel pipe for h2s corrosion resistant pipeline

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Embodiment Construction

[0014] The invention adopts blast furnace molten iron and high-quality scrap steel as raw materials. The mass percentage content of blast furnace molten iron is 90%, and the mass percentage content of high-quality steel scrap is 10%. The preparation method of the invention comprises: the production process of the continuous casting round tube billet and the tube making process. The specific production process is as follows:

[0015] The production process of continuous casting round billet includes: molten iron pretreatment→top-bottom combined blowing converter smelting→LF furnace refining→VD vacuum treatment→round billet continuous casting→cutting

[0016] Step S1: Hot metal pretreatment

[0017] 90 tons of blast furnace molten iron is pretreated with "metal magnesium powder" for desulfurization and deoxidation, so that the mass percentage of S in the molten iron after the pretreatment of the molten iron is ≤0.010%.

[0018] Step S2: Converter Smelting with Top and Bottom ...

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Abstract

The invention discloses a seamless steel tube material for a rare-earth-containing H2S corrosion-resistant pipeline. The seamless steel tube material for the rare-earth-containing H2S corrosion-resistant pipeline comprises chemical components in percentage by mass: 0.06-0.12 of C, 0.05-0.30 of Si, 0.80-1.10 of Mn, 0.10-0.30 of Cr, 0.10-0.20 of Mo, 0.03-0.10 of V, 0.01-0.03 of Ti, 0.01-0.04 of Al, 0.0005-0.0100 of rare earth element RE, not more than 0.015 of Cu, not more than 0.015 of P, and not more than 0.005 of S, and the balance of matrix Fe and impurity elements. The invention further discloses a preparation method for the seamless steel tube material for the rare-earth-containing H2S corrosion-resistant pipeline. The prepared seamless steel tube is higher in H2S stress corrosion resistance property.

Description

technical field [0001] The invention relates to the field of ferrous metal smelting and metal pressure processing, in particular to a rare earth-containing H 2 A method for preparing seamless steel pipes for corrosion pipelines. Background technique [0002] Pipeline transportation has been widely used because of its economical, high-efficiency, uninterrupted and pollution-free characteristics. In order to realize long-distance transportation of pipelines, high-grade steel line pipes are required. Due to the existence of water and H 2 S gas, which brings serious corrosion problems to the pipeline and is difficult to predict. Low temperature wet hydrogen sulfide corrosion mainly has two damage types: stress corrosion corrosion (SSC) and hydrogen induced cracking (HIC). Both of these two types of damage have caused serious accidents in oil and gas pipelines. For this reason, the anti-humidity H 2 S corrosion L290NS high-grade steel line pipe, the application of these mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28C22C33/04C21D8/10
Inventor 石晓霞丰小冬刘金郝振宇姜涛马爱清
Owner INNER MONGOLIA BAOTOU STEEL UNION
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