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High-strength steel sheet for acid-resistant line pipe, method of manufacturing same, and high-strength steel pipe using high-strength steel sheet for acid-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 manufacturing and high-strength steel pipe using high-strength steel plate for acid-resistant line pipe, can solve the deviation of steel plate material, the deviation of stopping temperature, the cooling speed problems such as deviation, and achieve the effect of excellent SSCC resistance and excellent HIC resistance

Active Publication Date: 2022-07-22
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] On the other hand, when the thickness of the scale on the surface of the steel plate is uneven, 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 becomes a problem.
As a result, variations in the steel sheet quality in the sheet width direction occur due to variations in scale thickness

Method used

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  • High-strength steel sheet for acid-resistant line pipe, method of manufacturing same, and high-strength steel pipe using high-strength steel sheet for acid-resistant line pipe
  • High-strength steel sheet for acid-resistant line pipe, method of manufacturing same, and high-strength steel pipe using high-strength steel sheet for acid-resistant line pipe
  • High-strength steel sheet for acid-resistant line pipe, method of manufacturing same, and high-strength steel pipe using high-strength steel sheet for acid-resistant line pipe

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Effect test

Embodiment

[0119] The steels (steel types A to M) having the compositions shown in Table 1 were formed into slabs by the continuous casting method, heated to the temperatures shown in Table 2, and then subjected to the rolling end temperature and rolling reduction shown in Table 2. hot-rolled at a rate, and steel sheets having the plate thicknesses shown in Table 2 were prepared. Then, under the conditions shown in Table 2, the steel sheet was controlled-cooled using a water-cooled controlled cooling device. Then, the steel sheet was immediately reheated so that the average temperature of the steel sheet became the "reheating temperature" in Table 2 using an in-line induction heating apparatus.

[0120] [Organization determination]

[0121] The microstructure of the obtained steel sheet 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 sheet and the structure at the center of the ...

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Abstract

The present invention provides a high-strength steel plate for acid-resistant line pipe, which not only has excellent HIC resistance, but also has excellent SSCC resistance in a more severe corrosive environment and SSCC resistance in an environment with a low hydrogen sulfide partial pressure of less than 1 bar. The high-strength steel sheet for acid-resistant line pipe of the present invention is characterized in that it has the following composition: it contains a predetermined amount of C, Si, Mn, P, S, Al, Mo, and Ca, and contains a predetermined amount of More than one type of iron, the rest is composed of Fe and unavoidable impurities; the steel structure of 0.25mm below the surface of the steel plate is a dislocation density of 1.0×10 14 ~7.0×10 14 (m －2 ) bainite structure, the deviation of the Vickers hardness of 0.25 mm below the surface of the steel plate is 30 HV or less when the standard deviation is σ, and the deviation of the Vickers hardness in the thickness direction is 30 HV or less when the standard deviation is σ It is 30 HV or less in terms of 3σ, and has a tensile strength of 520 MPa or more.

Description

technical field [0001] The present invention designs an acid-resistant high-strength steel plate for line pipe with excellent material uniformity in steel plates suitable for line pipes in the fields of construction, marine structures, shipbuilding, civil engineering, and construction industrial machinery, and a manufacturing method thereof. 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] Generally, a line pipe is manufactured by forming a steel plate manufactured by a thick plate mill or a hot rolling mill into a steel pipe by UOE forming, press bending, roll forming, and the like. [0003] Among them, line pipes used in the transportation of crude oil and natural gas containing hydrogen sulfide require not only strength, toughness, weldability, etc., but also resistance to hydrogen-induced cracking (HIC (Hydrogen Induced Cracking) resistan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D8/02C22C38/14C22C38/58
CPCC22C38/14C22C38/02C22C38/04C22C38/06C22C38/12C22C38/16C21D8/0226C21D8/0263C21D2211/002C22C38/001C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C21D6/005C21D6/008C22C38/20C21D9/46C22C38/22C22C38/24C22C38/26C22C38/28C22C38/38C22C38/58
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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