Method for manufacturing oil casings made of R95-grade steel containing rare earth

A technology of oil casing and production method, applied in the direction of furnace type, furnace, quenching agent, etc., can solve the problems of lack of competitiveness and high cost, and achieve the effects of good high-temperature mechanical properties, low cost, and improved impact toughness

Inactive Publication Date: 2013-02-20
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Now many steel mills mostly use chrome-manganese-molybdenum steel. Due to the addition of molybdenum metal, the cost is high, and it lacks competitiveness under the current market conditions.

Method used

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  • Method for manufacturing oil casings made of R95-grade steel containing rare earth
  • Method for manufacturing oil casings made of R95-grade steel containing rare earth
  • Method for manufacturing oil casings made of R95-grade steel containing rare earth

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Experimental program
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Embodiment 1

[0030] 1. Smelting test parameters

[0031] The following tables 2-5 are the chemical composition of smelting, gas content, control of five harmful elements and inspection results of continuous casting round billet sulfur marks. From the results in the table, it can be seen that the smelting control of steel is very good, creating a good foundation for further production in the next factory. Good raw material condition.

[0032] Table 2 Gas content

[0033] H O N maximum value 1.55 28 48 minimum value 0.38 14 36 average value 1.02 19 40

[0034] Table 3 Chemical Composition of Tube Body

[0035] C Si mn P S Cr Al maximum value 0.30 0.34 1.54 0.019 0.008 0.38 0.038 minimum value 0.25 0.23 1.37 0.012 0.002 0.30 0.020 average value 0.27 0.28 1.42 0.016 0.005 0.33 0.025

[0036] [0036] Table 4 Five harmful elements

[0037] As sn Pb Sb Bi maximum value...

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Abstract

The invention relates to a method for manufacturing oil casings made of R95-grade steel containing rare earth. The method is characterized in that each casing blank comprises, by weight, from 0.24% to 0.30% of C, from 0.15% to 0.35% of Si, from 1.35% to 1.55% of Mn, lower than or equal to 0.020% of P, lower than or equal to 0.010% of S, from 0.30% to 0.40% of Cr, from 0.02% to 0.04% of Al, from 0.0007% to 0.0110% of rare earth elements RE and the balance Fe which is a matrix. A casing heat treatment regime includes that the temperature is 910 DEG C+ / -20 DEG C and is kept for 50 minutes, and then water quenching is performed; and the tempering temperature is 630 DEG C+ / -20 DEG C and is kept for 80 minutes, then air cooling production is carried out, and the steel casings with optional sizes can meet standard requirements. The method has the advantages that the 27Mn2CrRe steel containing carbon manganese steel and the rare earth is reasonable in material constitution design, and is low in cost due to the fact that materials for manufacturing the casings do not contain precious metal elements such as molybdenum; the water quenching and tempering are combined in a heat treatment process, and the water quenching does not affect environments and is low in cost, so that the plasticity of the steel is greatly improved on the premise that the strength of the obtained oil casings made of the R95-grade steel is guaranteed, the impact toughness of the steel casings is improved, and the steel casings are excellent in high-temperature mechanical property and can meet service requirements on oil casings under different working conditions.

Description

1. Technical field: [0001] The invention relates to a method for producing rare earth-containing R95 steel grade petroleum casing, belonging to the technical field of ferrous metallurgy. 2. Background technology: [0002] The API Spec 5CT standard only stipulates the upper limit of some elements for the R95 steel grade oil casing, and the chemical composition can be designed by yourself, and the oil casing that meets the standard requirements can be obtained through heat treatment. [0003] Now many steel mills mostly use chrome-manganese-molybdenum steel. Due to the addition of molybdenum metal, the cost is high, and it lacks competitiveness under the current market conditions. 3. Contents of the invention: [0004] The object of the present invention is to provide a production method of R95 steel grade (27Mn2CrRE steel grade) containing rare earth. The method of the present invention adopts carbon-manganese steel plus rare earth steel after rolling and undergoes a heat ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/18C21D1/18C21D1/60C21D8/10C21D9/08
CPCY02P10/20
Inventor 郭智韬刘金贺景春姜海龙董珍丰小冬
Owner INNER MONGOLIA BAOTOU STEEL UNION
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