C110 steel graded petroleum casing pipe containing rare earth and production method thereof

A technology of oil casing and production method, which is applied in the field of metallurgical steel pipes, can solve the problems of short service life and low hydrogen sulfide corrosion resistance of oil casing, and achieve the effects of improving SSC resistance, improving SSC resistance, and reducing center porosity

Inactive Publication Date: 2018-08-07
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the petroleum casing in the prior art has low hydrogen sulfide corrosion resistance and short service life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0046] Example, preparation of rare earth-containing C110 steel grade petroleum casing

[0047] Use desulfurized molten iron that meets the requirements, molten iron requirements: P≤0.120%, S≤0.050%, and the quality of all alloys and raw materials must meet the standard requirements;

[0048] Single-slag process is used for smelting, and the final slag basicity is controlled at 3.2; silicon-manganese, ferromanganese and ferrochromium alloys are used for deoxidation and alloying, and aluminum deoxidation is used for final deoxidation; In the process, add an appropriate amount of white ash blocks (after the alloy is added);

[0049] When necessary, the molten steel is subjected to slag removal, and the entire refining process is normally blown with argon; the method of gradually increasing the heating rate from low to high levels is adopted; according to the composition and temperature of the molten steel in the converter, slagging and desulfurization, composition adjustment and h...

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Abstract

The invention discloses a C110 steel graded petroleum casing pipe containing rare earth. The petroleum casing pipe is prepared from the following components in percentage by weight: 0.27 to 0.30 percent of C, 0.15 to 0.30 percent of Si, 0.35 to 0.50 percent of Mn, 1.35 to 1.45 percent of Cr, 0.60 to 0.70 percent of Mo, 0.02 to 0.04 percent of V, 0.10 to 0.20 percent of Ni, 0.02 to 0.05 percent ofAl, 0.02 percent of Re, less than or equal to 0.020 percent of P and less than or equal to 0.005 percent of S. The invention further discloses a production method of the petroleum casing pipe. According to the petroleum casing pipe and the production method thereof, inner tissues of the petroleum casing pipe are uniform and chemical components are not segregated; the SSC resistance of the petroleum casing pipe is improved; the obtained petroleum casing pipe has good quality, the service life is prolonged, the transportation safety of a pipeline is increased and requirements on social development are easy to met.

Description

technical field [0001] The invention relates to the technical field of metallurgical steel pipes, in particular to a rare earth-containing C110 steel grade petroleum casing and a production method thereof. Background technique [0002] With the continuous and rapid development of society, the demand for energy such as oil and natural gas is increasing. The continuous growth of energy demand, structural adjustment and optimization have driven the overall development of the oil and natural gas industry. The transportation of oil is usually carried by pipelines. Pipeline transportation is an economical, safe and uninterrupted transportation method, which has the advantages of large transportation volume, low cost, high safety, convenience and high efficiency. To meet future oil and gas demand, H 2 The number of S oil and gas fields being developed has greatly increased compared to the past, and at the same time, the demand for pipeline steel for sour service has also increase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C38/06C21D8/10
CPCC21D8/105C22C38/005C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46
Inventor 郭智韬宋江波
Owner BAOTOU IRON & STEEL GRP
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