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High-strength steel plate for acid-resistant line pipe, method for producing the same, and high-strength steel pipe using high-strength steel plate for acid-resistant line pipe

A technology of high-strength steel plate and manufacturing method, applied in the field of high-strength steel plate for acid-resistant line pipe and its manufacture and high-strength steel pipe using high-strength steel plate for acid-resistant line pipe, capable of solving cooling stop temperature deviation, steel plate material deviation, oxidation Uneven skin thickness, etc., to achieve excellent HIC resistance and SSCC resistance

Active Publication Date: 2022-01-04
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 local cooling stop temperature variation 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 plate for acid-resistant line pipe, method for producing the same, and high-strength steel pipe using high-strength steel plate for acid-resistant line pipe
  • High-strength steel plate for acid-resistant line pipe, method for producing the same, and high-strength steel pipe using high-strength steel plate for acid-resistant line pipe
  • High-strength steel plate for acid-resistant line pipe, method for producing the same, and high-strength steel pipe using high-strength steel plate for acid-resistant line pipe

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Experimental program
Comparison scheme
Effect test

Embodiment

[0108] Steels (steel grades A to K) having the composition shown in Table 1 were made into slabs by continuous casting, heated to the temperature shown in Table 2, and then rolled at the end temperature shown in Table 2 Steel sheets with the thicknesses shown in Table 2 were prepared by hot rolling at the rolling reduction ratio. Then, under the conditions shown in Table 2, the cooling control of the steel plates was performed using a water-cooling type cooling control device.

[0109] [determination of organization]

[0110] 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 0.5 mm below the surface of the steel plate and the structure at the center of the plate thickness.

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Abstract

The present invention provides an acid-resistant high-strength steel sheet for line pipe that is excellent not only in HIC resistance but also in SSCC resistance in a severer corrosion environment. The high-strength steel plate for acid-resistant line pipe of the present invention is characterized in that it has the following composition: C: 0.02-0.08%, Si: 0.01-0.50%, Mn: 0.50-1.80%, P: 0.001-0.015% by mass % %, S: 0.0002 to 0.0015%, Al: 0.01 to 0.08%, and Ca: 0.0005 to 0.005%, and the rest is composed of Fe and unavoidable impurities. The steel structure of 0.5mm 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 0.5 mm below the surface of the steel plate is 30 HV or less in terms of 3 σ when the standard deviation is σ, and has a tensile strength of 520 MPa or more.

Description

technical field [0001] The present invention relates to an acid-resistant high-strength steel plate for line pipe, which is suitable for line pipe in the fields of construction, marine structures, shipbuilding, civil engineering, and construction industrial machinery, and has excellent material uniformity in the steel plate, 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 produced by a thick plate rolling mill or a hot rolling mill into a steel pipe by UOE forming, press bending, roll forming, or the like. [0003] Among them, line pipes used to transport 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D8/02C22C38/06C22C38/58
CPCC21D8/02C22C38/00C22C38/06C22C38/58C22C38/02C22C38/04C22C38/12C22C38/14C22C38/16C22C38/18C22C38/20C22C38/24C22C38/26C22C38/28C21D9/46C21D8/0263C21D1/02C21D1/19C21D6/005C21D8/0231C21D9/08C21D9/085
Inventor 横田智之嶋村纯二太田周作田村雄太上冈悟史长谷和邦
Owner JFE STEEL CORP
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