Stainless steel for oil wells and stainless steel pipe for oil wells

A technology for stainless steel and oil wells, which is applied in the field of stainless steel for oil wells and stainless steel pipes for oil wells. It can solve the problems of high price and achieve the effect of high strength and excellent high temperature corrosion resistance.

Inactive Publication Date: 2014-12-10
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although duplex stainless steel has high strength and high corrosion resistance, it contains a large amount of alloying elements, so it is expensive

Method used

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  • Stainless steel for oil wells and stainless steel pipe for oil wells
  • Stainless steel for oil wells and stainless steel pipe for oil wells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0121] Steels of numbers 1 to 28 having the chemical compositions shown in Table 1 were melted, and cast slabs were produced by continuous casting.

[0122] [Table 1]

[0123]

[0124] Referring to Table 1, steels with numbers 1 to 20 are within the scope of the present invention. On the other hand, the chemical compositions of Nos. 21 to 28 are outside the scope of the present invention.

[0125] Roll the billets of each label with a blooming mill to manufacture round billets. The diameter of the round billet of each steel was 232 mm. Next, the outer surface of each round billet was cut so that the diameter of the round billet was 225 mm.

[0126] Each round billet is heated to 1150-1200°C in a heating furnace. After heating, each round billet is hot rolled. Specifically, a round billet is pierced and rolled using a piercer to manufacture a pipe. The tube blank is stretched and rolled with a mandrel type seamless tube rolling mill, and then the diameter is reduced, s...

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Abstract

Provided is stainless steel for oil wells, which has excellent corrosion resistance at high temperatures and is capable of stably achieving a strength of 758 MPa or more. This stainless steel for oil wells contains, in mass%, 0.05% or less of C, less than 1.0% of Si, 0.01-1.0% of Mn, 0.05% or less of P, 0.002% or less of S, 16-18% of Cr, 1.8-3% of Mo, 1.0-3.5% of Cu, 3.0-5.5% of Ni, 0.01-1.0% of Co, 0.001-0.1% of Al, 0.05% or less of O and 0.05% or less of N, with the balance made up of Fe and impurities. This stainless steel for oil wells satisfies the following formula (1) and formula (2). Cr + 4Ni + 3Mo + 2Cu >= 44 (1) Cr + 3Ni + 4Mo + 2Cu / 3 <= 46 (2) In this connection, the contents (mass%) of corresponding elements are assigned to respective symbols of elements in formula (1) and formula (2).

Description

technical field [0001] The present invention relates to stainless steel for oil wells and stainless steel pipes for oil wells, and more specifically, to stainless steel for oil wells and stainless steel pipes for oil wells that can be used in high-temperature oil well environments and natural gas well environments (hereinafter referred to as high-temperature environments). Background technique [0002] In this specification, oil wells and natural gas wells are collectively referred to as "oil wells". Therefore, in this specification, "stainless steel for oil well" includes stainless steel for oil well and stainless steel for natural gas well. "Stainless steel pipes for oil wells" include stainless steel pipes for oil wells and stainless steel pipes for natural gas wells. [0003] In this specification, unless otherwise specified, "high temperature" means a temperature of 150°C or higher. In this specification, unless otherwise specified, "%" concerning an element means "ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/52C22C38/54C21D9/08
CPCC22C38/54C22C38/002C21D9/08C22C38/04C21D2211/005C22C38/44C21D6/004C22C38/50C22C38/46C21D2211/008C22C38/42C22C38/06C22C38/48C21D6/002C22C38/02C22C38/52C22C38/001C22C38/004C22C38/005E21B17/00
Inventor 中塚信二郎大江太郎天谷尚高部秀树乙咩阳平富尾悠索妹尾昌尚大村朋彦近藤邦夫
Owner NIPPON STEEL CORP
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