Hot-continuous-rolled steel belt for oil casing of grade N80 and production method thereof

A technology for oil casing and production method, which is applied in the field of hot continuous rolling steel strip for N80 grade oil casing and its production, can solve the problems of high heat treatment cost, pollution, consumption of large energy and the environment, etc. Low consumption and low cost effect

Active Publication Date: 2014-02-19
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The composition of the steel used in this production method is relatively simple, but the cost of heat treatmen

Method used

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  • Hot-continuous-rolled steel belt for oil casing of grade N80 and production method thereof
  • Hot-continuous-rolled steel belt for oil casing of grade N80 and production method thereof
  • Hot-continuous-rolled steel belt for oil casing of grade N80 and production method thereof

Examples

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Example Embodiment

[0023] Example 1

[0024] The chemical composition is: C0.25wt%, Si0.10wt%, Mn1.20wt%, P0.01wt%, S0.002wt%, Nb0.018wt%, Cr0.30wt%, Ti0.010wt%, the rest are Fe and non For the steel to avoid impurities, the continuous casting billet production is completed according to the steelmaking process route of "full three removal" smelting, LF refining, and slab casting to obtain a cast slab with a thickness of 230mm.

[0025] Then the cast slab is subjected to surface flame cleaning and sent to a heating furnace for heating. The heating temperature is 1240℃, and the temperature equalization time is ≥30min. After being discharged from the furnace, rough rolling is carried out. The thickness of the intermediate slab is 38mm, and the roughing exit temperature is 1000℃. Stand continuous rolling, the final rolling temperature is 800℃, the intermediate pyrometer value of the two-stage cooling process system is 630℃, the air cooling time is 7s, and the coiling temperature is 510℃, so as to obtain ...

Example Embodiment

[0026] Example 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 non For the steel with avoided impurities, the continuous casting billet is produced according to the steelmaking process route of "full three-removal" smelting, LF refining, and slab casting to obtain a slab with a thickness of 232mm.

[0028] Then the cast slab is subjected to surface flame cleaning and sent to a heating furnace for heating. The heating temperature is 1230℃, and the temperature equalization time is ≥30min. After being discharged from the furnace, rough rolling is carried out. The thickness of the intermediate slab is 40mm, and the rough rolling outlet is 1040℃. Rolling, the final rolling temperature is 820℃, the middle high temperature value of the two-stage cooling process system is 650℃, and the coiling temperature is 530℃, so as to obtain the N80 grade petroleum casing hot continuous rolled steel stri...

Example Embodiment

[0029] Example 3

[0030] The chemical composition is: C0.35wt%, Si0.30wt%, Mn1.80wt%, P0.02wt%, S0.005wt%, Nb0.050wt%, Cr0.50wt%, Ti0.020wt%, the rest are Fe and non For the steel with avoided impurities, the continuous casting billet production is completed according to the steelmaking process route of "full three removal" smelting, LF refining, and slab casting to obtain a cast billet with a thickness of 235mm.

[0031] Then the cast slab is subjected to surface flame cleaning, and then sent to a heating furnace for heating. The heating temperature is 1220℃, the temperature equalization time is ≥30min, and the rough rolling is carried out after being discharged. The thickness of the intermediate slab is 42mm, and the rough rolling outlet is 1060℃. Rolling, the final rolling temperature is 840℃, the middle high temperature value of the two-stage cooling process system is 680℃, and the coiling temperature is 560℃, so as to produce N80 grade petroleum casing hot continuous rolled s...

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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 petroleum casing, and particularly relates to a hot continuous rolled steel strip for N80 grade petroleum casing and a production method thereof. Background technique [0002] Petroleum casing is an important equipment for oil drilling. According to the API5CT standard, oil casing can be produced using seamless steel pipe and longitudinally welded pipe manufacturing processes. For the longitudinally welded pipe, the traditional production process is: design the appropriate chemical composition according to the needs of the casing performance; smelt the slab and roll it into a coil; the coil is made by forming and high-frequency longitudinal resistance welding Pipe material and heat treatment of the whole pipe. The steel grade used in this production method is relatively simple in composition, but the heat treatment cost is high, and the production process needs to consume a lot of energy and cause serious env...

Claims

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Application Information

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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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