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High-strength steel sheet for sour-resistant line pipe, method for producing same, and high-strength steel pipe using high-strength steel sheet for sour-resistant line pipe

A high-strength steel plate and a technology for manufacturing method, which are applied in the field of high-strength steel plate for acid-resistant line pipe and its manufacture and high-strength steel pipe using the high-strength steel plate for acid-resistant line pipe, can solve the problem of stopping temperature deviation, steel plate material deviation, cooling rate problems such as deviation, and achieve the effect of excellent HIC resistance and SSCC resistance

Active Publication Date: 2021-05-04
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] On the other hand, when the thickness of the scale on the surface of the steel plate is not uniform, the cooling rate of the steel plate below it also varies during cooling, and the variation of the local cooling stop temperature in the steel plate also becomes a problem.
As a result, variations in steel sheet quality occur in the sheet width direction due to variations in scale thickness

Method used

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  • High-strength steel sheet for sour-resistant line pipe, method for producing same, and high-strength steel pipe using high-strength steel sheet for sour-resistant line pipe
  • High-strength steel sheet for sour-resistant line pipe, method for producing same, and high-strength steel pipe using high-strength steel sheet for sour-resistant line pipe
  • High-strength steel sheet for sour-resistant line pipe, method for producing same, and high-strength steel pipe using high-strength steel sheet for sour-resistant line pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0112] Steels (steel grades A to M) with the composition shown in Table 1 were made into slabs by continuous casting, heated to the temperatures shown in Table 2, and then rolled at the end temperature and reduction ratio shown in Table 2. hot rolled to produce steel plates with the thicknesses shown in Table 2. Thereafter, the steel plates were controlled and cooled under the conditions shown in Table 2 using a water-cooled controlled cooling device.

[0113] [organization specific]

[0114] The microstructure of the obtained steel plate was observed with an optical microscope and a scanning electron microscope. Table 2 shows the structure at a position 0.25 mm below the surface of the steel plate and the structure at the center of the plate thickness.

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Abstract

Provided is a high-strength steel sheet for sour-resistant line pipe which has not only excellent HIC resistance but also excellent SSCC resistance in severely corrosive environments and excellent SSCC resistance in environments with a low hydrogen sulphide partial pressure of less than 1 bar. This high-strength steel sheet for sour-resistant line pipe is characterized by having a component composition containing predetermined amounts of C, Si, Mn, P, S, Al, Mo and Ca, and further containing Nb and / or Ti at predetermined amounts, with the remainder being made up of Fe an unavoidable impurities, the steel microstructure at 0.25 mm below the surface of the steel plate being a bainite microstructure having a dislocation density of 1.0*10<14> to 7.0*10<14> (m<-2>), the variation in Vickers hardness at 0.25 mm below the surface of the steel plate not exceeding 30 HV at 3 standard deviations, the variation in Vickers hardness in the plate thickness direction not exceeding 30 HV at 3 standard deviations, and the tensile strength being at least 520 MPa.

Description

technical field [0001] The present invention relates to an acid-resistant high-strength steel sheet for linepipe that is suitable for use in the fields of construction, marine structures, shipbuilding, civil engineering, and construction industrial machinery, and has excellent material uniformity in steel sheets for linepipes and its manufacturing method. In addition, the present invention relates to a high-strength steel pipe using the above-mentioned high-strength steel plate for acid-resistant linepipe. Background technique [0002] In general, line pipe is manufactured by forming a steel plate produced by a thick plate mill or hot rolling mill into a steel pipe by UOE forming, press bending, roll forming, or the like. [0003] Here, in addition to strength, toughness, weldability, etc., the line pipes used for the transportation of crude oil and natural gas containing hydrogen sulfide also need to be resistant to hydrogen-induced cracking (HIC (Hydrogen Induced Cracking)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D8/02C22C38/14C22C38/58
CPCC22C38/14C22C38/58C22C38/001C22C38/02C22C38/04C22C38/06C22C38/12C22C38/42C22C38/46C22C38/48C22C38/50C21D8/0226C21D8/0263C21D9/46C21D2211/002C21D6/005C21D6/008C22C38/002C22C38/22C22C38/24C22C38/26C22C38/28C22C38/38C22C38/44
Inventor 嶋村纯二横田智之上冈悟史石川信行
Owner JFE STEEL CORP
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