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Martensitic stainless steel for oil casing and manufacturing method thereof

A martensitic stainless steel and manufacturing method technology, applied in manufacturing tools, heat treatment equipment, heat treatment furnaces, etc., can solve the problem of high cost and achieve the effects of high production efficiency, good hardenability and good toughness

Inactive Publication Date: 2012-07-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although duplex stainless steel (22-25% Cr) can meet the requirements, but the cost is higher

Method used

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  • Martensitic stainless steel for oil casing and manufacturing method thereof
  • Martensitic stainless steel for oil casing and manufacturing method thereof
  • Martensitic stainless steel for oil casing and manufacturing method thereof

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Embodiment

[0030] Table 1 shows the chemical composition of the steels A1-A8 of the examples of the present invention and the steels B1-B3 of the comparison. Among them, B1 steel does not add N, Cu and other elements, and the matrix contains more than 10% high-temperature ferrite.

[0031]The processing and manufacturing methods of the steel in the embodiment of the present invention and the reference steel are as follows: 1) smelting in a vacuum furnace, protective pouring into a round ingot, and forming by hot rolling after casting the ingot. 2) Carry out modulated heat treatment, the heat treatment quenching temperature is 950-1100°C, keep warm for 45 minutes, then take out the furnace and air cool to around room temperature; tempering temperature is 550-650°C, keep warm for 60 minutes, and air cool.

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Abstract

The invention relates to a martensitic stainless steel for an oil casing and a production method thereof. The artensitic stainless steel comprises the following chemical components in percentage by weight: at most 0.04% of C, 0.20-1% of Si, 0.30-1% of Mn, at most 0.02% of P, at most 0.010% of S, 14-17% of Cr, less than 5% and at most 7% of Ni, 1.5-2.3% of Mo, 0-0.16% of N, 0.05-2.5% of Cu, one or more of 0.01-0.10% of Nb, 0.01-0.10% of V and 0.01-0.10% of Ti, and the balance of iron and inevitable trace impurity elements. The manufacturing method of the steel comprises the following steps: heating the oil casing to 950-1100 DEG C, cooling to below 200 DEG C by air cooling, oil cooling or water cooling, and heating to 550-650 DEG C to implement tempering. The steel has a microstructure which uses a tempered martensite phase as a base phase, and contains high-temperature ferrite (delta-ferrite), austenite and other second phases of which the volume contents are respectively below 10% or the total content is below 15%. The steel provided by the invention has the characteristics of high strength (the yield strength is up to Grade 110-150ksi), strong carbon dioxide / chloride ion corrosion resistance and the like, and can partially substitute double-phase stainless steel to be used in deep wells, superdeep wells and other severe well conditions.

Description

technical field [0001] The invention relates to a super-martensitic stainless steel and a manufacturing method thereof, in particular to an ultra-low carbon martensitic stainless steel for oil casings with a yield strength of 110-150ksi steel grade and high resistance to carbon dioxide and chloride ion corrosion and a manufacturing method thereof. Background technique [0002] carbon dioxide (CO 2 ) and chloride ion coexistence environment is a long-term and ubiquitous corrosion type in the world petroleum industry. In recent years, the number of deep wells and ultra-deep wells in my country has continued to increase, and the environment at the bottom of the well has become increasingly harsh. High temperature and high pressure environment, the simultaneous presence of CO 2 , chloride ions and water have higher and higher requirements on the corrosion resistance, strength and toughness of oil casing materials. [0003] At high temperature and pressure, high CO content 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C22C38/48C22C38/46C21D9/08
Inventor 张忠铧杨瑞青张春霞
Owner BAOSHAN IRON & STEEL CO LTD
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