Steel plate for pressure vessel with yield strength being 345 MPa stage and production method

A production method and technology for pressure vessels, applied in the field of metallurgy, can solve problems such as restricting the construction and development of the national economy, and achieve the effects of good laminar tear resistance, optimized heating and rolling conditions, and excellent low-temperature impact toughness and elongation.

Inactive Publication Date: 2017-04-26
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a long time, due to the lack of necessary production equipment and technical support, and the lack of mature experience in the production of steel plates for pressure vessels with high toughness and high plasticity with a yield strength of 345MPa in China, it cannot meet the needs of the domestic market and seriously restricts the development of my country's national economic construction.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The high-toughness and high-plasticity steel plate for pressure vessels with a yield strength of 345 MPa adopts the following composition ratio and production process.

[0032] Composition ratio (wt): C: 0.15%, Si: 0.23%, Mn: 1.43%, P: 0.007%, S: 0.001%, Al: 0.030%, Nb: 0.023%, O: 0.002%, the balance is Fe and unavoidable impurities. Thickness 60mm.

[0033] Production process: (1) Smelting process: molten steel is first smelted in the primary smelting furnace, then sent to the LF refining furnace for refining, using increased slag volume and multiple slag flow, the slag volume is 1600kg, a small amount of slag is added in multiple batches, and the white slag atmosphere is kept for a long time 25 minutes, Al in slag 2 o 3The content of FeO in the slag is 25%, the content of (FeO) in the slag is 10%, the amount of slag remaining at the end of refining is 1000kg, the argon blowing and stirring intensity of the LF furnace is large, the argon flow is large in the first 1...

Embodiment 2

[0040] The high-toughness and high-plasticity steel plate for pressure vessels with a yield strength of 345 MPa adopts the following composition ratio and production process.

[0041] Composition ratio (wt): C: 0.15%, Si: 0.28%, Mn: 1.48%, P: 0.007%, S: 0.001%, Al: 0.028%, Nb: 0.025%, O: 0.002%, the balance is Fe and unavoidable impurities. Thickness 40mm.

[0042] Production process: (1) Smelting process: molten steel is first smelted in the primary smelting furnace, then sent to the LF refining furnace for refining, using increased slag volume and multiple slag flow, the slag volume is 1600kg, a small amount of slag is added in multiple batches, and the white slag atmosphere is kept for a long time 25 minutes, Al in slag 2 o 3 The content of FeO in the slag is 25%, the content of (FeO) in the slag is 10%, the amount of slag remaining at the end of refining is 1000kg, the argon blowing and stirring intensity of the LF furnace is large, the argon flow is large in the first ...

Embodiment 3

[0049] The high-toughness and high-plasticity steel plate for pressure vessels with a yield strength of 345 MPa adopts the following composition ratio and production process.

[0050] Composition ratio (wt): C: 0.16%, Si: 0.30%, Mn: 1.46%, P: 0.007%, S: 0.001%, Al: 0.025%, Nb: 0.023%, O: 0.002%, the balance is Fe and unavoidable impurities. Thickness 25mm.

[0051] Production process: (1) Smelting process: molten steel is first smelted in the primary smelting furnace, then sent to the LF refining furnace for refining, using increased slag volume and multiple slag flow, the slag volume is 1600kg, a small amount of slag is added in multiple batches, and the white slag atmosphere is kept for a long time 25 minutes, Al in slag 2 o 3 The content of FeO in the slag is 25%, the content of (FeO) in the slag is 10%, the amount of slag remaining at the end of refining is 1000kg, the argon blowing and stirring intensity of the LF furnace is large, the argon flow is large in the first ...

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Abstract

The invention discloses a steel plate for a pressure vessel with the yield strength being the 345 MPa stage and a production method. The steel plate comprises chemical components including, by weight, 0.15%-0.18% of C, 0.15%-0.35% of Si, 1.40%-1.50% of Mn, not larger than 0.008% of P, not larger than 0.002% of S, 0.020%-0.040% of Al, 0.020%-0.035% of Nb, not larger than 0.003% of O and the balance Fe and inevitable impurities. The production method includes the heating process, the rolling process and the heat treatment process. According to the steel plate for the pressure vessel with the yield strength being the 345 MPa stage, the clean steel technology idea is adopted; the steel plate has the beneficial effects that the purity degree is high, and -10 DEG C low temperature impact toughness and plasticity mainly show that the extending rate is excellent, and the lamellar tearing resistance is excellent; and the steel for the pressure vessel can meet the requirement for developing to high plasticity and high toughness, and the steel plate can be widely used for the pressure vessel industry.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a steel plate for a pressure vessel with a yield strength of 345 MPa and a production method. Background technique [0002] In recent years, with the rapid development of national economic construction, the demand for high toughness and high plasticity 345MPa grade pressure vessel steel plate has become increasingly prominent, and the market demand for high toughness and high plasticity 345MPa grade pressure vessel steel plate is increasing . For a long time, due to the lack of necessary production equipment and technical support, and the lack of mature experience in the production of steel plates for pressure vessels with high toughness and high plasticity with a yield strength of 345MPa in China, it cannot meet the needs of the domestic market and seriously restricts the development of my country's national economic construction. . Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D8/02
CPCC22C38/02C21D8/0226C21D8/0247C22C38/04C22C38/06C22C38/12
Inventor 邓建军莫德敏张志勇
Owner WUYANG IRON & STEEL
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