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Steel for petroleum sleeve connecting piece and production method of steel

A technology of petroleum casing and manufacturing method, applied in the field of metallurgy, can solve the problems of dense organization, poor composition uniformity, increased cost of raw materials, and high rejection rate, so as to ensure surface quality, reduce structural stress and thermal stress, and avoid internal cracks Effect

Inactive Publication Date: 2014-02-12
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, users mainly use steel ingots as raw materials for forgings. However, due to problems such as low yield, compact structure, and poor composition uniformity of steel ingots, the quality stability of forgings is low, the scrap rate is high, and the cost of raw materials increases.

Method used

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  • Steel for petroleum sleeve connecting piece and production method of steel
  • Steel for petroleum sleeve connecting piece and production method of steel
  • Steel for petroleum sleeve connecting piece and production method of steel

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preparation example Construction

[0041] The preparation method of the continuous casting round billet for petroleum casing connectors provided by the present invention includes the following production steps: electric furnace primary refining process→LF refining process→VD vacuum degassing process→continuous casting process→slab slow cooling process→inspection , Finishing process;

[0042] The following percentages are mass percentages unless otherwise specified.

[0043] The initial smelting process of electric furnace: adopt the furnace material structure of scrap steel and molten iron, in which the mass percentage of molten iron accounts for 50% to 75%; Auxiliary; combined with oxygen blowing, blowing carbon powder or other carbon powder-containing agents to create foam slag; adding slagging materials such as lime to make slag dephosphorization; eccentric furnace bottom tapping, leaving steel and slag operation; during the tapping process , stirring with argon blowing at the bottom;

[0044] Preferably, ...

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Abstract

The invention discloses steel for a petroleum sleeve connecting piece and a production method thereof and belongs to the technical field of metallurgy. The steel for the petroleum sleeve connecting piece comprises the following chemical components in percent by mass: 0.29-0.30% of C, 0.25-0.28% of Si, 0.51-0.54% of Mn, 0.008-0.012% of P, 0.003-0.006% of S, 0.96-0.97% of Cr, 0.190-0.200% of Mo, 0.024-0.030% of Alt, 50*10<-4>-58*10<-4>% of N, 12*10<-4>-14*10<-4>% of T.O and balance of Fe and inevitable impurities. The production method of the steel for the petroleum sleeve connecting piece comprises the following production processes: electric furnace primary smelting, LF (low frequency) refining, VD (vacuum degassing), continuous casting, slowly cooling of a casting blank, testing and finishing. Cleanliness, tissue compactness and uniformity of a continuous casting round billet, obtained by adopting the production method, for the petroleum sleeve connecting piece are greatly improved, and requirements for the steel for the petroleum sleeve connecting piece are met.

Description

[0001] This application is a divisional application of a patent application with an application date of May 23, 2012, an application number of 201210160645.2, and an invention title of "steel for oil casing connectors and its manufacturing method". technical field [0002] The invention belongs to the technical field of metallurgy, and relates to a steel for oil casing connectors and a manufacturing method thereof. Background technique [0003] As the "industrial blood", petroleum work plays an irreplaceable important role in ensuring economic development. With the rapid development of petroleum work, oil well development is developing in the direction of deep wells, ultra-deep wells, and extended displacement. Oil casing is a key equipment widely used in the field of oil exploitation, and its main function is to fix the oil well wall. Due to the particularity of the oil extraction process, the quality of the oil casing directly affects the production safety of the oil well....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C33/04
CPCY02P10/20
Inventor 李法兴徐锡坤蔡朝华翟正龙何庆文李业才刘永昌张伟李顺时振明郑桂芸
Owner LAIWU IRON & STEEL GRP
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