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A kind of hot continuous rolling steel strip for n80 oil casing pipe and its production method

A technology for oil casing pipes and production methods, applied in the field of hot rolling steel strips for N80 grade oil casing pipes and its production field, can solve the problems of high heat treatment cost, pollution, large energy consumption and environment, and achieve the guarantee of strength and toughness indicators, process performance The effect of low consumption and low cost

Active Publication Date: 2015-10-28
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition of the steel used in this production method is relatively simple, but the cost of heat treatment is high, and the production process consumes a lot of energy and causes serious pollution to the environment.

Method used

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  • A kind of hot continuous rolling steel strip for n80 oil casing pipe and its production method
  • A kind of hot continuous rolling steel strip for n80 oil casing pipe and its production method
  • A kind of hot continuous rolling steel strip for n80 oil casing pipe and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The chemical composition is: C0.25wt%, Si0.10wt%, Mn1.20wt%, P0.01wt%, S0.002wt%, Nb0.018wt%, Cr0.30wt%, Ti0.010wt%, the rest is Fe and not For the steel that avoids impurities, the continuous casting slab production is completed according to the steelmaking process route of "full three removal" smelting, LF refining, and slab casting to obtain a slab with a thickness of 230mm.

[0025] Then, the surface of the cast slab is flame-cleaned and sent to the heating furnace for heating. The heating temperature is 1240°C, and the temperature equalization time is ≥30min. After being released from the furnace, it is rough-rolled. Rack continuous rolling, the final rolling temperature is 800°C, the middle pyrometer value of the two-stage cooling process system is 630°C, the air cooling time is 7s, and the coiling temperature is 510°C, so as to produce N80 grade hot-rolled steel strip for oil casing, and the obtained N80 The chemical composition and composition content of the hot...

Embodiment 2

[0027] The chemical composition is: C0.29wt%, Si0.25wt%, Mn1.46wt%, P0.01wt%, S0.002wt%, Nb0.029wt%, Cr0.38wt%, Ti0.016wt%, the rest is Fe and not The steel with impurities to be avoided is sequentially followed by the steelmaking process route of "full three removal" smelting, LF refining, and slab pouring to complete continuous casting slab production to obtain a 232mm thick casting slab.

[0028] Then the surface of the slab is flame-cleaned, and sent to the heating furnace for heating. The heating temperature is 1230°C, and the temperature equalization time is ≥30min. After being released from the furnace, it is rough-rolled. Rolling, the final rolling temperature is 820°C, the middle pyrometer value of the two-stage cooling process system is 650°C, and the coiling temperature is 530°C, so as to produce N80 hot-rolled steel strip for oil casing, and the obtained N80 hot-rolled steel for oil casing The chemical composition of the tape is: C0.29wt%, Si0.25wt%, Mn1.46wt%, P0....

Embodiment 3

[0030]The chemical composition is: C0.35wt%, Si0.30wt%, Mn1.80wt%, P0.02wt%, S0.005wt%, Nb0.050wt%, Cr0.50wt%, Ti0.020wt%, the rest is Fe and not For the steel to avoid impurities, the continuous casting slab production is completed according to the steelmaking process route of "full three removal" smelting, LF refining, and slab pouring to obtain a slab with a thickness of 235mm.

[0031] Then the cast slab is flame-cleaned on the surface, and sent to the heating furnace for heating. The heating temperature is 1220°C, and the temperature equalization time is ≥30min. Rolling, the final rolling temperature is 840°C, the middle pyrometer value of the two-stage cooling process system is 680°C, and the coiling temperature is 560°C, so as to produce N80 hot-rolled steel strip for oil casing, and the obtained N80 hot-rolled steel for oil casing The chemical composition of the belt is: C0.35wt%, Si0.30wt%, Mn1.80wt%, P0.02wt%, S0.005wt%, Nb0.050wt%, Cr0.50wt%, Ti0.020wt%, V0.003wt% ...

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Abstract

The invention provides a hot-continuous-rolled steel belt for an oil casing of grade N80. The hot-continuous-rolled steel belt contains the following chemical components in percentage by weight: 0.25-0.35 weight percent of C, 0.10-0.30 weight percent of Si, 1.2-1.8 weight percent of Mn, 0-0.020 weight percent of P, 0-0.0050 weight percent of S, 0.018-0.050 weight percent of Nb, 0.30-0.50 weight percent of Cr, 0.010-0.020 weight percent of Ti, 0-0.005 weight percent of V and 0-0.005 weight percent of Mo, and the balance of Fe and inevitable impurities. The hot-continuous-rolled steel belt for the oil casing of grade N80 adopts a two-segment cooling and hot-rolling process and is directly obtained through hot continuous rolling. The matrix structure of the hot-continuous-rolled steel belt is a ferrite + bainite dual phase structure, the grain size is at least 12 grade, the yield strength is 552MPa<= Rt0.5<=758MPa, the tensile strength Rm is at least 689MPa, the elongation A50mm is at least 20 percent, and the mechanical property can meet the API5CT standard requirement.

Description

technical field [0001] The invention belongs to the technical field of oil casing pipes, and in particular relates to a hot continuous rolling steel strip for N80 oil casing pipes and a production method thereof. Background technique [0002] Oil casing is an important equipment for oil drilling. According to the API5CT standard, oil casing can be produced with seamless steel pipe and longitudinal welded pipe manufacturing process. For straight seam welded pipes, the traditional production process is: design the appropriate chemical composition according to the performance requirements of the casing; smelt the slab and roll it into a coil; make the coil by forming and high-frequency straight seam resistance welding Tube material and heat treatment for the whole tube. The composition of the steel used in this production method is relatively simple, but the cost of heat treatment is high, a large amount of energy is consumed in the production process and serious pollution is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/28C22C33/04
Inventor 王超孙大庆缪成亮崔阳王志鹏张宏艳程政徐芳阳代军
Owner SHOUGANG CORPORATION
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