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Alitizing modified steel used for P110-grade oil sleeve and tubular product manufacturing method of alitizing modified P110-grade steel

A technology of surface aluminizing and manufacturing method, which is applied in the field of surface aluminizing modified P110 grade oil casing steel and its pipe manufacturing field, can solve the problems of decreased anti-corrosion performance of the pipe surface, long supply cycle, complicated process, etc. Low content, saving energy and cost, good corrosion resistance

Active Publication Date: 2015-11-25
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the P110 oil casing steel commonly used for surface aluminizing modification mostly adopts quenching and tempering treatment, the process is complex, the cost is high, and the delivery cycle is long
In addition, after the surface aluminized modification treatment, the pipe needs to be re-tuned and tempered, resulting in a decrease in the anti-corrosion performance of the pipe surface

Method used

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  • Alitizing modified steel used for P110-grade oil sleeve and tubular product manufacturing method of alitizing modified P110-grade steel
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  • Alitizing modified steel used for P110-grade oil sleeve and tubular product manufacturing method of alitizing modified P110-grade steel

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Experimental program
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Effect test

Embodiment 1

[0042] A surface aluminized modified P110 steel for oil casing, its chemical composition (weight percentage) is: 0.079% of C, 2.3% of Mn, 0.7% of Si, 0.0078% of P, 0.0017% of S, 1.1% Cr, 0.019% Ti, and the rest is Fe.

[0043] The method for manufacturing the above-mentioned surface aluminized modified P110 steel pipe for oil casing pipes, according to the percentage by weight, the above-mentioned components are smelted in a converter or an electric furnace, refined outside the refinery, and cast to obtain a tube blank, and the tube blank is heated to 1250°C by an annular heating furnace ;Pierce the heated tube billet through the piercing machine, and the temperature of the tube billet after piercing is 1220°C; then it is rolled through the continuous rolling mill, and the rolling start temperature of the continuous rolling mill is controlled to be 1180°C; then it is sized through the sizing mill , the starting temperature of the sizing unit is controlled to be 870°C; it is st...

Embodiment 2

[0046]A surface aluminized modified P110 steel for oil casing, its chemical composition (weight percentage) is: 0.083% of C, 2.31% of Mn, 0.61% of Si, 0.0088% of P, 0.0024% of S, 1.1% Cr, 0.020% Ti, and the rest is Fe.

[0047] The manufacturing method of the above-mentioned surface aluminized modified P110 grade oil casing steel pipe, according to the weight percentage, the above-mentioned cost is smelted in a converter or an electric furnace, refined outside the refinery, and cast to obtain a tube blank, and the tube blank is heated to 1250°C by an annular heating furnace ;Pierce the heated tube billet through the piercing machine, and the temperature of the tube billet after piercing is 1200°C; then it is rolled through the continuous rolling mill, and the rolling start temperature of the continuous rolling mill is controlled to be 1150°C; then it is sized through the sizing mill , the starting temperature after controlling the sizing unit is 850°C; it is straightened by a ...

Embodiment 3

[0050] A surface aluminized modified P110 steel for oil casing, its chemical composition (weight percentage) is: 0.089% C, 2.31% Mn, 0.71% Si, 0.0078% P, 0.0028% S, 1.2% Cr, 0.020% Ti, and the rest is Fe.

[0051] The method for manufacturing the above-mentioned surface aluminized modified P110 steel pipe for oil and casing, according to the percentage by weight, the above-mentioned components are smelted in a converter or an electric furnace, refined outside the refinery, and cast to obtain a tube blank, and the tube blank is heated to 1250°C by an annular heating furnace ;Pierce the heated tube billet through the piercing machine, and the temperature of the tube billet after piercing is 1220°C; then it is rolled by the continuous rolling mill, and the rolling start temperature of the continuous rolling mill is controlled to be 1150°C; and then sized by the sizing mill , the starting temperature after controlling the sizing unit is 860°C; it is straightened by a straightening...

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Abstract

The invention discloses alitizing modified steel used for a P110-grade oil sleeve and a tubular product manufacturing method of the alitizing modified steel. The alitizing modified steel comprises, by weight, 0.07-0.09% of C, 2.10-2.35% of Mn, 1.0-1.2% of Cr, 0.60-0.80% of Si, not more than 0.03% of S, not more than 0.03% of P, not more than 0.020% of Ti, the balance iron and inevitable impurities. A tubular product is obtained by heating a tube blank, conducting punching, conducting sizing after conducting rolling, and conducting slow refrigeration after conducting air cooling. The manufactured tubular product completely meets the requirements of API SPEC 5CT for performance of steel used for the P110 oil sleeve, the production and manufacture cost can be reduced, and the production manufacturability is improved. In addition, the carbon content of chemical components is low, microalloying is achieved, the impact toughness is high, the welding performance is good, the anti-corrosion performance is good, and the oil sleeve steel has good crack arrest capacity.

Description

technical field [0001] The invention relates to the technical field of oil pipe manufacturing, in particular to a surface aluminized modified P110 oil casing steel and a method for manufacturing the pipe. Background technique [0002] With the development of the petroleum industry, the performance requirements of the anti-corrosion technology for the surface of the oil casing are continuously improved. [0003] At present, the P110 oil casing steel commonly used for surface aluminizing modification mostly adopts quenching and tempering treatment, the process is complex, the cost is high, and the delivery cycle is long. In addition, after the surface aluminized modification treatment, the pipe needs to be quenched and tempered again, resulting in a decrease in the anti-corrosion performance of the pipe surface. The use of non-quenched and tempered steel to produce oil well pipes can simplify the production process and greatly reduce the production cost and lead time. Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C21D8/10
Inventor 冯春韩礼红冯耀荣
Owner BC P INC CHINA NAT PETROLEUM CORP
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