Seamless stainless steel tube and manufacturing method thereof
A technology of seamless steel pipe and manufacturing method, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of insufficient corrosion resistance of stainless steel, and achieve the effect of high strength and excellent corrosion resistance
Pending Publication Date: 2022-05-06
JFE STEEL CORP
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Problems solved by technology
However, the development of oil wells at higher temperatures (high temperatures as high as 200°C) is currently underway, and the corrosion resistance of 13Cr martensitic stainless steel may be insufficient
Method used
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Experimental program
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Embodiment
[0133] Hereinafter, the present invention will be further described based on examples.
[0134] After casting raw steel pipes using the molten steel (steel No.A to BJ) with the composition shown in Table 1-1 and Table 1-2, the raw steel pipes are heated and made into pipes by hot working using a model seamless rolling mill. A seamless steel pipe having an outer diameter of 83.8 mm x a wall thickness of 12.7 mm was fabricated and air-cooled. At this time, the heating temperature of the steel pipe raw material before hot working was set to 1250°C.
[0135] The raw material of the test piece was cut out from the obtained seamless steel pipe, and subjected to quenching treatment as follows: reheating to a heating temperature of 960° C., setting the soaking time to 20 minutes, and cooling (water cooling) to a temperature of 30° C. Cooling stop temperature. Then, a tempering treatment was further performed by heating to a heating temperature of 575°C or 620°C, setting the soaking ...
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Abstract
Provided is a stainless steel seamless steel pipe having high strength and excellent corrosion resistance. The seamless stainless steel pipe contains, in mass%, 0.06% or less of C, 1.0% or less of Si, 0.05% or less of P, 0.005% or less of S, more than 15.7% and 18.0% or less of Cr, 1.8% to 3.5% or less of Mo, 1.5% to 3.5% or less of Cu, 2.5% to 6.0% or less of Ni, 0.10% or less of Al, 0.10% or less of N, 0.010% or less of O, 0.5% to 2.0% or less of W, and 0.01% to 1.5% or less of Co, with C, Si, Mn, Cr, Ni, Mo, Cu, and N satisfying a prescribed formula, the steel sheet has a structure containing, by volume fraction, 25% or more of a martensite phase, 65% or less of a ferrite phase, and 40% or less of a retained austenite phase, and has a yield strength of 758 MPa or more.
Description
technical field [0001] The present invention relates to a martensitic stainless steel seamless steel pipe suitable for use in oil wells and gas wells (hereinafter simply referred to as oil wells). The present invention is particularly concerned with gas containing carbon dioxide (CO 2 ), chloride ion (Cl - ) and high temperature severe corrosive environment, containing hydrogen sulfide (H 2 Improvement of corrosion resistance under the environment of S). Background technique [0002] In recent years, from the viewpoint of energy depletion that can be expected in the near future, efforts are being made to investigate oil fields that have not been discovered in depth, environments containing carbon dioxide gas, and environments containing hydrogen sulfide called sour environments. Oil wells with lower and harsher corrosive environments are developed. Steel pipes for oil wells used in such environments are required to have high strength and excellent corrosion resistance. ...
Claims
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IPC IPC(8): C22C38/52C22C38/44C22C38/42C22C38/02C21D9/08C21D1/18
CPCC22C38/42C22C38/44C22C38/52C22C38/02C21D1/18C21D9/08C21D2211/008C21D2211/005C21D2211/001C22C38/004C22C38/04C22C38/48C22C38/46C22C38/50C22C38/54C22C38/002C22C38/008C22C38/005C22C38/001C22C38/06C22C38/60C21D8/105C21D9/085C21D6/004C21D1/25C21D8/10
Inventor 加茂祐一柚贺正雄
Owner JFE STEEL CORP