Production method for producing shock toughness of pipe coupling material of hot rolled oil well

A technology of impact toughness and production method, applied in the direction of metal rolling, etc., to achieve the effect of excellent toughness, refinement of grains, and inhibition of grain growth

Active Publication Date: 2010-09-15
ANGANG STEEL CO LTD
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Problems solved by technology

[0006] The purpose of the present invention is to provide a production method for improving the impact toughness of hot-rolled oil well pipe coupling material, aiming at the rolling process of thick-walled seamless pipe of oil well pipe coupling material, through controlled rolling and controlled

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  • Production method for producing shock toughness of pipe coupling material of hot rolled oil well

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Embodiment Construction

[0013] The weight percentage of a chemical composition is: C: 0.24% ~ 0.40%, Si: 0.17% ~ 0.60%, Mn: 1.30% ~ 1.70%, P≤0.025%, S≤0.010%, Ti: 0.010% ~ 0.030% , N≤0.008%; the balance is iron and unavoidable impurities. The specifications are: Φ153.67×13.50mm, Φ127×13.50mm, Φ88.9×13mm, Φ93.17×14.5mm, Φ108×14.50mm, Φ133×15.50mm oil well pipe coupling materials as an example.

[0014] During the implementation process, the tube blank of the above-mentioned composition steel is heated to 1250°C-1280°C, and kept for 2h-3h; the tube blank is pierced into a capillary tube at 1200°C-1250°C; The steel pipes after continuous rolling and stripping are rapidly cooled to a certain temperature above Ar3 (850°C-950°C); after rapid cooling, the average temperature of the steel pipes in the traverse chain is 15s-30s; (750°C~850°C) directly into the sizing machine to ensure final rolling in the metastable austenite zone not lower than Ar3; after sizing and final rolling, spray water or steam mist ...

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Abstract

The invention discloses a production method for producing shock toughness of pipe coupling material of a hot rolled oil well. The method comprises the steps of: heating pipe blanks at the temperature of 1250-1280 DEG C, punching at the temperature of 1200-1250 DEG C, and continuously rolling at the temperature of 980-1100 DEG C; quickly cooling to 850-950 DEG C with water after rolling; and then carrying out temperature equilibrium on steel pipes; pressing the steel pipes subject to temperature equalization in a sizing and reducing rolling mill at the temperature of 40-140 DEG C above Ar3; quickly cooling the steel pipes subjected to sizing to the temperature of Ar1 to 70 DEG C above Ar1; and finally, moving the steel pipes to a cooling bed for air cooling. After being continuously rolledand deformed, the steel pipes are quickly cooled with water to an austenite area with lower temperature to inhibit the growth of the crystallized austenite grains; in addition, the two-stage type cooling is carried out after sizing, the increased stress even deformation in the steel pipes caused by the one-stage type forced cooling of the final rolling can be avoided, the recrystallized austenite, the final ferrite and pearlite are fined, the toughness and strength of the steel pipes are both enhanced and the quality rate of the product is enhanced from 43.6% to more than 99%.

Description

technical field [0001] The invention belongs to the technical field of low-alloy steel manufacturing, and relates to a production method for improving the impact toughness of hot-rolled oil well pipe coupling materials. Background technique [0002] Coupling connection is currently the most commonly used method for connecting oil well pipes. The couplings used are usually made of thick-walled seamless steel pipes, which have clear requirements for toughness indicators in addition to strength requirements. [0003] The special production process of hot-rolled seamless steel pipes determines that the impact toughness of thick-walled pipes is low, and a good match between strength and toughness cannot be obtained. One of the current improvement measures is to adjust the composition and increase the content of precious metals; one is to Using heat treatment method. [0004] Both of the above two methods require high cost. In order to reduce the cost and achieve the purpose of s...

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Application Information

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IPC IPC(8): B21B23/00
Inventor 王长顺姜长华解德刚俞平陈克东郭海明马普生李应雄邸军徐咏梅
Owner ANGANG STEEL CO LTD
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