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Round blank for high-steel level oil bushing and manufacturing process

An oil casing and high-grade steel technology, applied in casing, manufacturing converters, drill pipes, etc., can solve the problems of poor steel strength, toughness and metallographic structure, and increase the cost, and achieve high temperature tempering brittleness reduction. Harm, improve the purity, save the effect of Mo resources

Inactive Publication Date: 2009-06-03
TIANJIN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology solves problems associated with making strong but hardened materials like cathode ray tubular or spiral welded seamless steel plates used on oil well drilling equipment such as wireline tools that are commonly found at sites where they come into contact during operations due to their extreme temperature conditions. These types of steels have been developed through different methods resulting in improved performance without adding extra costly metals. Additionally, this process helps reduce impurities from crude oils being processed while maintaining good quality standards.

Problems solved by technology

The technical problem addressed in this patents relates to improving the mechanical property, stability, reliability, and durable crack behavior of high-quality oil cased tubular drilling plugs made from these materials due to their superior characteristics including improved tensile stress, connectivity between cracks, reduced thermal response, lowered temperatures during use, prevention against rustiness or damage when exposed to severe environments like salt water environment.

Method used

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  • Round blank for high-steel level oil bushing and manufacturing process

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Experimental program
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Effect test

Embodiment 1

[0035] (1) In molten iron, [Si]=0.45%, [P]=0.070%, [S]=0.028%.

[0036] (2) Converter smelting, smelting steel type 30Mn2Cr, adopting high carbon drawing operation, tapping [C]=0.11%, [P]=0.009%; adopting slag retaining to tap, slag thickness 40mm.

[0037] (3) LF refining, composition control [C]=0.30%, [Si]=0.26%, [Mn]=1.59%, [Cr]=0.29%, [Al]=0.0245%, [S]=0.005%; The white slag refining time is 16 minutes; the refining exit temperature is controlled at 1612°C, and the LF refining treatment time is 31 minutes.

[0038] (4) VD refining process, vacuum treatment of molten steel at a vacuum degree of 60Pa for 10 minutes, while blowing argon at a pressure of 0.20MPa and stirring; the outbound hydrogen content is 1.2ppm; feed 150m of CaSi wire to improve the fluidity of molten steel and denature treatment of inclusions; After the end of the CaSi wire, perform a soft blowing operation with a pressure of 0.17MPa for 9 minutes; adjust the continuous casting station temperature to 15...

Embodiment 2

[0041] (1) Furnace molten iron: [Si]=0.50%, [P]=0.075%, [S]=0.025%.

[0042] (2) Converter smelting. The smelting steel is 30Mn2Cr, adopting high carbon drawing operation, tapping [C]=0.12%, [P]=0.010%; tapping with slag blocking, the thickness of the slag is 45mm.

[0043] (3) LF refining. Component control [C]=0.31%, [Si]=0.27%, [Mn]=1.58%, [Cr]=0.27%, [Al]=0.0225%, [S]=0.005%; white slag refining time 17 minutes ; The refining exit temperature is controlled at 1611°C, and the LF refining treatment time is 33 minutes.

[0044] (4) VD refining process. Vacuum treatment of molten steel: Keep the vacuum at 65Pa for 12 minutes, while blowing argon at 0.23MPa and stirring; the outbound hydrogen content is 1.5ppm; feed 135m of CaSi wire to improve the fluidity of molten steel and denature treatment of inclusions; after feeding the CaSi wire, carry out pressure The soft blowing operation is 0.18MPa for 8 minutes; the continuous casting arrival temperature is adjusted to 1567°C....

Embodiment 3

[0047] (1) Furnace molten iron: [Si]=0.55%, [P]=0.067%, [S]=0.026%.

[0048] (2) Converter smelting. The smelting steel is 30Mn2Cr, adopting high carbon drawing operation, tapping [C]=0.12%, [P]=0.011%; tapping with slag blocking, the thickness of slag is 35mm.

[0049] (3) LF refining. Composition control [C]=0.31%, [Si]=0.26%, [Mn]=1.61%, [Cr]=0.28%, [Al]=0.0195%, [S]=0.008%; white slag refining time 19 minutes ; The refining exit temperature is controlled at 1608°C, and the LF refining treatment time is 34 minutes.

[0050] (4) VD refining process. Vacuum treatment of molten steel: Keep the vacuum at 62Pa for 13 minutes, while blowing argon at 0.18MPa and stirring; the outbound hydrogen content is 1.2ppm; feed 140m of CaSi wire to improve the fluidity of molten steel and denature treatment of inclusions; after feeding the CaSi wire, carry out pressure The soft blowing operation is 0.18MPa for 10 minutes; the continuous casting arrival temperature is adjusted to 1562°C. ...

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Abstract

The invention relates to a round bland in a new type of steel and a manufacturing process. An oil bushing, in particular P110 high-steel level oil bushing, is used for deep well and environment having complicated layer conditions, and requires higher demand on quality of round tube blank for the oil bushing. At present, there mainly are C-Mn steel serial, Mo-containing steel serial, the C-Mn steel serial are more economical but relatively more inferior in intensity, toughness and metallurgical structure of the steel; the Mo-containing steel serial has good intensity, toughness and high temperature resistance but with cost thereof being increased dramatically. The invention uses a measure that control C content, higher Mn content and adds a particular amount of Cr, which meets the demand of intensity of the steel pipe, and the invention designs new type of steel and the manufacturing process thereof. The main components are (based on weight percent): C=0.28-0.34%, Si=0.20-0.35%, Mn=1.40-1.80%, Cr=0.25-0.34%, P is not more than 0.025%, S is not more than 0.025%, Al=0.01-0.03%, and Fe in equilibrium amount, diameter of the round blank is 150 to 200 mm; the invention employs the procedures of top-bottom re-blowing rotary furnace-LF refining furnace-VD vacuum refining furnace-round blank continuous caster-turn-over cooling bed-checkup-warehousing.

Description

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Claims

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Application Information

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Owner TIANJIN IRON & STEEL GRP
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