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Steel plate with excellent hydrogen-induced cracking resistance and toughness of the weld heat affected zone, and steel tube for use as line pipe

A welding heat-affected and hydrogen-induced crack resistance technology, applied in the field of pipeline steel pipes, can solve the problems of toughness deterioration and brittle fracture, and achieve the effect of excellent toughness

Inactive Publication Date: 2015-11-18
KOBE STEEL LTD
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Problems solved by technology

[0005] In these conventional technologies, although HIC can be suppressed, brittle fracture may occur in the heat-affected zone of the surface layer, and the toughness will deteriorate significantly. It is difficult to achieve a balance between hydrogen-induced cracking resistance and toughness of the heat-affected zone (HAZ toughness).

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  • Steel plate with excellent hydrogen-induced cracking resistance and toughness of the weld heat affected zone, and steel tube for use as line pipe
  • Steel plate with excellent hydrogen-induced cracking resistance and toughness of the weld heat affected zone, and steel tube for use as line pipe

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Embodiment

[0107] Hereinafter, the present invention will be described in more detail by way of examples, but it goes without saying that the present invention is not limited to the following examples, and can of course be appropriately modified and implemented within the scope that can meet the foregoing and the following principles, and these are all included in the present invention. range of technologies.

[0108] The steel of the composition shown in Table 1 was melted, and a slab (slab) having a thickness of 280 mm was obtained by the following Ca addition method and casting method. Table 2 shows the conditions for adding Ca to continuous casting in the manufacturing process. That is, in the Ca addition step after LF and RH treatment, when the addition rate of Ca is set to be 0.002 kg / min·t to 0.020 kg / min·t, the column of “(1) Ca addition rate” in Table 2 It is "○", and other cases are "x". In addition, when the time from the addition of Ca to the start of supply of molten steel...

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Abstract

This steel plate has excellent hydrogen-induced cracking resistance and toughness of the weld heat affected zone (HAZ toughness), and this steel tube is obtained using said steel plate. This steel plate is characterized by comprising prescribed elements with the remainder being iron and unavoidable impurities, wherein the ratio (Ca / S) of Ca content to S content is 2.0 or greater, and the Ca content, S content and O content satisfy (Ca-1.25S) / O ≰ 1.8, and further, in the region from the surface to 5mm deep in the thickness direction, there are 2.0 per mm2 or fewer Ca-based inclusions that have a 50μm or longer major axis or long side, and 5×102 per μm2 or more TiN's that have a 300nm or shorter major axis or long side.

Description

technical field [0001] The present invention relates to a steel sheet excellent in hydrogen cracking resistance and heat-affected zone toughness suitable for natural gas and crude oil transportation line pipes, pressure vessels, storage tanks, etc., and hydrogen cracking resistance and Line pipe with excellent toughness in the welded heat-affected zone. Background technique [0002] With the development of inferior resources such as crude oil and gas containing hydrogen sulfide, pipelines, pressure vessels and storage tanks used for their transportation, refining and storage need to have so-called resistance to hydrogen-induced cracking and stress corrosion cracking. Sulfur. Hydrogen-induced cracking (Hydrogen-Induced Cracking, hereinafter referred to as "HIC") is known to be accompanied by the corrosion reaction caused by the above-mentioned hydrogen sulfide, etc., and hydrogen intrudes into the steel, and the intruded hydrogen is in the form of MnS and Nb (C, N ), where ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/14C22C38/58C21C7/04C21D8/02
CPCC22C38/00C21C7/04C21D8/02C22C38/14C22C38/58C21D8/0226C21D2211/004
Inventor 田代喜一郎加藤拓佐藤进佑三宅孝司川野晴弥
Owner KOBE STEEL LTD
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