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Non-quenched and tempered n80 steel grade oil casing and preparation method thereof

An oil casing, non-quenched and tempered technology, applied in the field of metallurgy, can solve the problem that the non-quenched and tempered N80-1 steel grade oil casing cannot meet the matching requirements of high strength and impact toughness, and avoid excessive grain growth , high rolling elongation and diameter reduction, the effect of improving strength and low temperature impact

Active Publication Date: 2019-11-22
DALIPAL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the existing non-quenched and tempered N80-1 steel grade petroleum casing cannot meet the matching requirements of high strength and impact toughness, the present invention provides a non-quenched and tempered N80 steel grade petroleum casing and a preparation method thereof

Method used

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  • Non-quenched and tempered n80 steel grade oil casing and preparation method thereof
  • Non-quenched and tempered n80 steel grade oil casing and preparation method thereof

Examples

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Effect test

Embodiment 1

[0044] The embodiment of the present invention provides a non-quenched and tempered N80 steel grade petroleum casing, the chemical composition of which is:

[0045] C 0.28%, Si 0.32%, Mn 1.55%, P 0.006%, S 0.004%, Nb 0.016%, V 0.05%, Ti 0.013%, Al 0.040%, N 0.015%, Cr 0.05%, Ni 0.03%, Cu 0.01 %, As 0.020%, Sn0.005%, Pb 0.002%, Sb 0.004%, Bi 0.001%, and the balance is Fe.

[0046] The preparation steps of the above-mentioned non-quenched and tempered N80 steel grade petroleum casing are as follows:

[0047] Step 1. Using steel scrap as raw material, after electric arc furnace smelting, LF refining, and continuous casting, a continuous casting round billet with a specification of Φ180mm is obtained;

[0048] Step 2, after the continuous casting round billet is heat-treated in an annular furnace, it is perforated to obtain a capillary tube;

[0049] The furnace temperature of the heating furnace is: the temperature of the preheating section is 700°C, the temperature of the firs...

Embodiment 2

[0054] The embodiment of the present invention provides a non-quenched and tempered N80 steel grade petroleum casing, the chemical composition of which is:

[0055] C 0.30%, Si 0.40%, Mn 1.70%, P 0.015%, S 0.005%, Nb 0.011%, V 0.06%, Ti 0.007%, Al 0.025%, N 0.013%, Cr 0.08%, Ni 0.10%, Cu 0.06 %, As 0.002%, Sn 0.02%, Pb 0.001%, Sb 0.01%, Bi 0.002%, and the balance is Fe.

[0056] The preparation steps of the above-mentioned non-quenched and tempered N80 steel grade petroleum casing are as follows:

[0057] Step 1. Using steel scrap as raw material, after electric arc furnace smelting, LF refining, and continuous casting, a continuous casting round billet with a specification of Φ180mm is obtained;

[0058] Step 2, after the continuous casting round billet is heat-treated in an annular furnace, it is perforated to obtain a capillary tube;

[0059] The furnace temperature of the heating furnace is: the temperature of the preheating section is 650°C, the temperature of the first...

Embodiment 3

[0064] The embodiment of the present invention provides a non-quenched and tempered N80 steel grade petroleum casing, the chemical composition of which is:

[0065] C 0.32%, Si 0.25%, Mn 1.63%, P 0.002%, S 0.008%, Nb 0.020%, V 0.08%, Ti 0.010%, Al 0.010%, N 0.017%, Cr 0.02%, Ni 0.04%, Cu 0.10 %, As 0.006%, Sn0.003%, Pb 0.01%, Sb 0.002%, Bi 0.01%, and the balance is Fe.

[0066] The preparation steps of the above-mentioned non-quenched and tempered N80 steel grade petroleum casing are as follows:

[0067] Step 1. Using steel scrap as raw material, after electric arc furnace smelting, LF refining, and continuous casting, a continuous casting round billet with a specification of Φ180mm is obtained;

[0068] Step 2, after the continuous casting round billet is heat-treated in an annular furnace, it is perforated to obtain a capillary tube;

[0069] The furnace temperature of the heating furnace is: the temperature of the preheating section is 750°C, the temperature of the first ...

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Abstract

The invention relates to the technical field of metallurgy, and particularly discloses a non-tempered N80 steel-grade petroleum casing pipe and a preparation method thereof. The non-tempered N80 steel-grade petroleum casing pipe comprises the following components in percent by weight: 0.28-0.32% of C, 0.25-0.40% of Si, 1.55-1.70% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.008% of S, 0.011-0.020% of Nb, 0.05-0.08% of V, 0.007-0.013% of Ti, 0.010-0.040% of Al, 0.013-0.017% of N, smaller than 0.10% of Cr, smaller than or equal to 0.10% of Ni, smaller than or equal to0.10% of Cu, smaller than or equal to 0.020% of As, smaller than or equal to 0.020% of Sn, smaller than or equal to 0.01% of Pb, smaller than or equal to 0.01% of Sb, smaller than or equal to 0.01% ofBi, smaller than or equal to 0.035% of Sn, As, Pb, Sb and Bi and the balance of Fe. Through component adjustment and technology optimization, design requirements on the tensile strength, the yield strength, the elongation and the impact energy of the N80 steel-grade petroleum casing pipe are met; the non-tempered N80 steel-grade petroleum casing pipe is stable in performance; compared with the tempering technology, the preparation method provided by the invention has the advantages as follows: the same quality requirements are met, the production process is shortened, energy is saved, the manufacturing cost is low, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a non-quenched and tempered N80 steel grade oil casing and a preparation method thereof. Background technique [0002] N80 steel pipes are generally oil casings, and N80 oil casings are important equipment for oil exploitation. Its main equipment also includes drill pipes, core pipes and oil pipes, drill collars and steel pipes for small-diameter drilling. In recent years, with the rapid development of my country's petroleum industry, the market demand for oil casings has increased year by year. At present, the demand for N80 steel grade oil casings in my country is about 1.5 million tons. N80 steel grade petroleum casing is mainly used as the casing string of oil and gas wells with a depth of 2000-4000m. Therefore, there are strict requirements for its comprehensive strength, toughness and low-temperature impact energy. There are three main indicators for the performance of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/50C22C38/48C22C38/46C22C38/42C22C38/06C22C38/02C22C38/60C22C33/04C21D6/00C21D9/08C21D11/00B21C37/06
CPCB21C37/06C21D6/004C21D6/005C21D6/008C21D9/085C21D11/00C21D11/005C21D2211/005C21D2211/009C22C33/04C22C38/001C22C38/002C22C38/008C22C38/02C22C38/06C22C38/42C22C38/46C22C38/48C22C38/50C22C38/58Y02P10/20
Inventor 胡楚江李健强程凯吕景岩
Owner DALIPAL PIPE
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