Heat treatment method for low-carbon manganese steel tubes

A heat treatment method and technology for carbon-manganese steel, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems that the performance of steel pipes cannot be fully satisfied, and achieve the effects of high performance qualification rate, small performance fluctuation range and stable performance.

Active Publication Date: 2012-11-21
HENGYANG VALIN STEEL TUBE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When using conventional methods for heat treatment, the fluctuation difference in yield strength of different steel pipes is 130Mpa, resulting in the performance of some steel pipes not fully meeting the requirements of API standards.

Method used

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  • Heat treatment method for low-carbon manganese steel tubes
  • Heat treatment method for low-carbon manganese steel tubes
  • Heat treatment method for low-carbon manganese steel tubes

Examples

Experimental program
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Embodiment 1

[0020] Embodiment 1. In this embodiment, low-carbon manganese steel is used to produce oil well pipes, the specification is 368*24, and the steel grade is L80. The composition of low-carbon manganese steel oil well pipes is expressed in mass %, specifically: Si: 0.10~0.50, Mn: 1.30~1.50, P: ≤0.035, S: ≤0.035, V: 0.08~0.18, Al: 0.01~0.06, and the rest are Fe, trace alloy V, Cr and unavoidable impurities.

[0021] For steel pipes with the above composition, through the statistical analysis of heat treatment test and production data, within the scope of Class III steel pipes, the steel pipes with a specification of 273*22.5 are relatively stable, and the steel pipes with a specification of 273*22.5 are used as a benchmark. Mi heavy craft. The meter weight of the steel pipe is: M=(273-22.5)×22.5×0.02466Kg=139Kg; the heat treatment process is: quenching temperature 915 degrees, heat preservation for 30 minutes, water quenching after the furnace, the cooling water volume of water qu...

Embodiment 2

[0023] Embodiment 2. In this embodiment, low-carbon manganese steel is used to produce oil well pipes, the specification is 219*22, and the steel grade is L80. The composition of low-carbon manganese steel oil well pipes is expressed in mass%, specifically: Si: 0.10~0.50, Mn: 1.30~1.50, P: ≤0.035, S: ≤0.035, V: 0.08~0.18, Al: 0.01~0.06, and the rest are Fe, trace alloy V, Cr and unavoidable impurities.

[0024] For steel pipes with the above composition, through statistical analysis of heat treatment tests and production data, within the scope of Class II steel pipes, the steel pipes with a specification of 196*17 are relatively stable in process, and the steel pipes with a specification of 196*17 are used as a benchmark Mi heavy craft. The meter weight of the steel pipe is: M=(196-17)×17×0.02466Kg=75Kg; the heat treatment process is: quenching temperature 920 degrees, heat preservation for 30 minutes, water quenching after the furnace, the cooling water volume of water quench...

Embodiment 3

[0026] Embodiment 3. In this embodiment, low-carbon manganese steel is used to produce oil well pipes, the specification is 115.3*15.5, and the steel grade is L80. The composition of low-carbon manganese steel oil well pipes is expressed in mass %, specifically: Si: 0.10~0.50, Mn: 1.30~1.50, P: ≤0.035, S: ≤0.035, V: 0.08~0.18, Al: 0.01~0.06, and the rest are Fe, trace alloy V, Cr and unavoidable impurities.

[0027]For the steel pipes with the above composition, through the statistical analysis of heat treatment test and production data, within the scope of Class I steel pipes, the steel pipes with a specification of 89*12.5 are more stable, and the steel pipes with a specification of 89*12.5 are used as a benchmark Mi heavy craft. The meter weight of the steel pipe is: M=(89-12.5)×12.5×0.02466 Kg=23.5Kg; the heat treatment process is: quenching temperature 915 degrees, heat preservation for 30 minutes, water quenching after the furnace, the cooling water volume of water quenc...

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Abstract

The invention discloses a heat treatment method for low-carbon manganese steel tubes. The method comprises steps of quenching and tempering the steel tubes and comprises the following detailed steps of: dividing the steel tubes into three types according to the outer diameter and wall thickness of the steel tubes, namely the I type of which the outer diameter is 40 to 140mm and the wall thicknessis 5 to 20mm, the II type of which the outer diameter is 140 to 250mm and the wall thickness is 5 to 40mm, and the III type of which the outer diameter is more than 250mm and the wall thickness is 10to 50mm; and in each type of steel tubes, through statistic analysis on heat treatment tests and production data, selecting a steel tube of which the performance is stable, the fluctuation range is relatively small and each index takes the tubes in the middle range of a standard requirement as standards, taking the meter weight of the steel tube as the standard meter weight, taking the heat treatment process of the steel tube with the standard meter weight as the standard meter weight process, and technically adjusting the heat treatment processes of the other meter weight steel tubes on the basis of the standard meter weight process.

Description

technical field [0001] The invention relates to a heat treatment method for seamless steel pipes, in particular to a heat treatment method for seamless steel pipes with narrow performance range requirements and low-carbon manganese steel. technical background [0002] With the development of the oil extraction industry, the use environment of seamless steel pipes for oil wells is becoming more and more complex, and the requirements for oil well pipes are getting higher and higher. In the American Petroleum Institute standard "API SPEC 5CT Casing and Tubing Specifications", oil casings The performance indicators have corresponding range requirements, especially the second group of steel grades L80, C90, C95, T95 steel pipes have a narrow range of yield strength (only 103MPa between the maximum value and the minimum value), and also the tensile strength And hardness also has corresponding range requirements. [0003] At present, during the heat treatment of such steel pipes, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/08
Inventor 周勇贺铁山叶君绍
Owner HENGYANG VALIN STEEL TUBE
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