H2S corrosion-resistant 80-ksi casing steel for shale gas and preparation method thereof

A technology of 80ksi and a manufacturing method, applied in the field of steel manufacturing, can solve problems such as the manufacturing method of uncorroded casing steel, and achieve the effects of improving H2S stress corrosion resistance, low production cost and high dimensional accuracy

Active Publication Date: 2016-04-13
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently shale gas uses 80ksi anti-H 2 The development of S-corrosion casing steel is still a new field in China, and 80ksi anti-H for shale gas has not been seen. 2 Related reports on S corroded casing steel and its manufacturing method

Method used

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  • H2S corrosion-resistant 80-ksi casing steel for shale gas and preparation method thereof
  • H2S corrosion-resistant 80-ksi casing steel for shale gas and preparation method thereof
  • H2S corrosion-resistant 80-ksi casing steel for shale gas and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0038] steelmaking

[0039] Electric furnace smelting: pig iron and common carbon steel scrap are used as raw materials, smelted in an electric arc furnace, and the end point C0.10%, P0.005%, the initial molten steel at a temperature of 1628 ° C, the furnace is tapped, and the steel process Addition amount of deoxidizer: add CaAlSi2.0kg / t steel, Al block addition amount 1.5kg / t steel to ensure good deoxidation.

[0040]LF refining and VD vacuum treatment: LF refining is performed on the molten steel initially smelted in an electric furnace, and after refining, it is fed into Ca wire 0.08kg / t steel for calcium treatment; after calcium treatment, VD vacuum degassing treatment is carried out, and the degassing is carried out at a vacuum degree ≤ 67Pa Gas treatment for 15 minutes; break the air when the VD vacuum treatment time reaches the requirement, and perform static blowing treatment with the VD vacuum chamber covered with a cover. The static blowing time is 20 minutes, and t...

Embodiment 2

[0051] steelmaking

[0052] Electric furnace smelting: pig iron and common carbon steel scrap are used as raw materials, smelted in an electric arc furnace, and the end point C0.11%, P0.008%, the initial molten steel at a temperature of 1630 ° C, the furnace is tapped, and the steel process Addition amount of deoxidizer: add CaAlSi3.0kg / t steel, Al block addition amount 1.0kg / t steel to ensure good deoxidation.

[0053] LF Refining and VD Vacuum Treatment: LF refining is performed on the molten steel initially smelted in an electric furnace. After refining, 0.10kg / t steel is fed into Ca wire for calcium treatment; after calcium treatment, VD vacuum degassing treatment is carried out, and the degassing is carried out at a vacuum degree ≤ 67Pa. Gas treatment for 15 minutes; break the air when the VD vacuum treatment time reaches the requirement, and perform static blowing treatment with the VD vacuum chamber cover covered. The static blowing time is 25 minutes, and the bottom bl...

Embodiment 3

[0064] steelmaking

[0065] Electric furnace smelting: pig iron and common carbon steel scrap are used as raw materials, smelted in an electric arc furnace, and the end point C0.08%, P0.004%, the initial molten steel at a temperature of 1640 ° C, the furnace is tapped, and the steel process Addition amount of deoxidizer: add CaAlSi3.0kg / t steel, Al block addition amount 1.5kg / t steel to ensure good deoxidation.

[0066] LF refining and VD vacuum treatment: LF refining is carried out on the molten steel initially smelted in an electric furnace. After refining, 0.09kg / t of Ca wire is fed for calcium treatment; after calcium treatment, VD vacuum degassing treatment is carried out, and degassing at a vacuum degree ≤ 67Pa Treat for 15 minutes; break the air when the VD vacuum treatment time reaches the requirement, and perform static blowing treatment with the VD vacuum chamber covered with a cover. The static blowing time is 23 minutes, and the bottom blowing Ar gas flow rate is c...

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Abstract

The invention discloses H2S corrosion-resistant 80-ksi casing steel for shale gas. The casing steel is prepared from, by weight, 0.25%-0.29% of C, 0.20%-0.35% of Si, 0.90%-1.10% of Mn, 0.95%-1.15% of Cr and the balance Fe, residual elements and unavoidable impurities. The invention further discloses a preparation method of the H2S corrosion-resistant 80-ksi casing steel for the shale gas. The preparation method comprises the steps of steelmaking, wherein pig iron and waste plain carbon steel are adopted as raw materials in the steelmaking process, a deoxidizing agent is added in the steel tapping process, static blowing treatment is performed in a VD vacuum chamber, and argon blowing and sealing gasket adding for protection are performed during pouring; pipe manufacturing, wherein the temperature of a heating zone ranges from 1210 DEG C to 1270 DEG C, and the temperature of a soaking zone ranges from 1240 DEG C to 1260 DEG C; heat treating, wherein the heat treatment technologies of spraying and inner axial flow water cooling quenching, air cooling tempering and straightening under the temperature are adopted. According to the casing steel, the yield strength is 552-655 MPa, the tensile strength is larger than or equal to 655 MPa, the transverse 10*10-mm V-shaped impact energy at 0 DEG C is larger than or equal to 40 J, the elongation is larger than or equal to 19%, and the allowed hardness change delta HRC is smaller than or equal to 3.0.

Description

technical field [0001] The invention relates to the technical field of steel manufacturing, in particular to an 80ksi anti-H 2 A manufacturing method of S corroded casing steel, and a casing steel obtained by the manufacturing method. Background technique [0002] As the world's main energy and high-quality chemical raw materials, oil and natural gas are one of the important production factors in today's social and economic development. Oil casing is a steel pipe used in oil exploration and production, and plays an important role in my country's oil industry. As the world's energy consumption continues to rise, a large number of oil and gas fields with harsh corrosive environments and other harsh conditions have been put into development one after another, and the development of unconventional energy including shale gas has received more and more attention. [0003] At present, the exploration and development of shale gas in my country has just started, mainly concentrated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/14C22C38/08C22C38/16C21C5/52C21C7/10C21D8/10C21D1/18
CPCC21C5/52C21C7/10C21D1/18C21D8/105C22C38/02C22C38/04C22C38/08C22C38/14C22C38/16C22C38/18Y02P10/20
Inventor 蒋世川陈坤黄英曾理
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM
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