High-strength martensite ferrite two-phase stainless steel anti-corrosion oil casing pipe and manufacturing method thereof

A technology of duplex stainless steel and manufacturing method, applied in the field of oil casing, can solve the problems of high alloy content, difficult to meet the requirements of deep wells, and high cost

Active Publication Date: 2013-12-25
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] This patent improves corrosion resistance by low carbon and adding a large amount of alloy elements, but due to the high content of alloys such as Ni and Mo,

Method used

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  • High-strength martensite ferrite two-phase stainless steel anti-corrosion oil casing pipe and manufacturing method thereof
  • High-strength martensite ferrite two-phase stainless steel anti-corrosion oil casing pipe and manufacturing method thereof
  • High-strength martensite ferrite two-phase stainless steel anti-corrosion oil casing pipe and manufacturing method thereof

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Embodiment Construction

[0051] The present invention will be further described below by embodiment.

[0052] After the molten steel with the chemical composition in Table 1 was cast into a round ingot, it was pierced and rolled into a steel pipe by a small rolling mill, and then air-cooled to make a seamless steel pipe with an outer diameter of 73.02mm×a wall thickness of 7.01mm.

[0053] The values ​​of formula (1) and formula (2) listed in Table 1 are calculated according to the following two formulas respectively:

[0054] Cr+1.5Mo+2Ni+16N (1)

[0055] Ni+30(C+N)+8Nb (2)

[0056] Among them, Cr, Mo, Ni, N, C, Nb, etc. are mass %.

[0057] After heating the above seamless steel pipe at 950°C for 30 minutes and air cooling to room temperature, temper at the temperature in Table 2, holding time for 60 minutes, and air cooling.

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Abstract

The invention provides a high-strength martensite and ferrite two-phase stainless steel anti-corrosion oil casing pipe and a manufacturing method of the high-strength martensite ferrite two-phase stainless steel anti-corrosion oil casing pipe. The high-strength martensite ferrite two-phase stainless steel anti-corrosion oil casing pipe comprises, by weight, 0.05% to 0.10% of C, 0.1% to 0.4% of Si, 0.20% to 1.0 % of Mn, less than 0.03% of P, less than 0.01% of S, 13.5% to 15.0% of Cr, 0.5% to 1.5% of Ni, 0.2% to 1.0% of Mo, 0.005% to 0.02% of Nb, 0.01% to 0.10% of N and less than 0.004% of O, wherein the compositions satisfies the inequality that Cr+1.5Mo+2Ni+16N>=17 and the inequality that Ni+30(C+N)+8Nb>=3.5, Cr, Ni, Mo, Si, Nb, Mn, C and N stand for the weight relative content of the elements, and the rest of the oil casing pipe comprises Fe and inevitable impurities. The oil casing pipe has good corrosion resistance performance, and the yield strength is more than 110ksi. The oil casing pipe is quenched and tempered, a martensite phase is used as the main body of a metallographic structure, and the metallographic structure contains 2% to 10% of ferrite phases. The steel pipe has good carbon dioxide corrosion resistance performance and low temperature impact toughness.

Description

technical field [0001] The invention relates to an oil casing for crude oil or natural gas oil wells and gas wells, in particular to a high-strength martensitic ferritic duplex stainless steel corrosion-resistant oil casing and a manufacturing method thereof, suitable for containing carbon dioxide gas (CO 2 ), chloride ion (Cl - ) and other oil wells and gas wells in very severe corrosive environments, with excellent corrosion resistance and impact toughness. Background technique [0002] With the intensification of my country's oil and gas development, oil well casings and tubing for collecting oil and gas are facing high temperature, high pressure, and high CO content. 2 , Cl - Coexisting strong corrosive environment. In addition, since many oil and gas resources are located in relatively cold regions, the temperature can reach minus 20 degrees or even lower during winter operations. For such an environment, high-alloy products are generally required to meet the corros...

Claims

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Application Information

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IPC IPC(8): C22C38/48C21D8/10
Inventor 张春霞刘耀恒张忠铧
Owner BAOSHAN IRON & STEEL CO LTD
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