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Production method of low-cost low-temperature high-strength container steel 07MnNiVDR

A production method and technology for container steel are applied in the production field of low-cost, low-temperature, high-strength container steel 07MnNiVDR, which can solve the problems of increasing the cost of heat treatment of steel plates and unfavorable market competition, and achieve the effect of avoiding mixed crystal phenomenon and ensuring mechanical properties.

Active Publication Date: 2022-04-26
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the existing production method of pressure vessel steel, in order to ensure the low-temperature performance of the steel plate, the process of quenching and tempering is adopted in the heat treatment of the steel plate, such as Chinese patents CN110184531A and CN111363973B, which will relatively increase the heat treatment cost of the steel plate and is not conducive to market competition

Method used

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  • Production method of low-cost low-temperature high-strength container steel 07MnNiVDR
  • Production method of low-cost low-temperature high-strength container steel 07MnNiVDR
  • Production method of low-cost low-temperature high-strength container steel 07MnNiVDR

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Composition design: In the technical plan, the steel plate 07MnNiVDR with a thickness of less than 60mm and a high-strength tempered pressure vessel contains the following mass percentages (unit, wt%): C: 0.07%, Si: 0.20%, Mn: 1.42%, P: 0.012%, S: 0.003%, Als: 0.020%, Ni: 0.35%, Cr: 0.22%, Mo: 0.15%, V: 0.025, others are Fe and residual elements, crack sensitivity coefficient Pcm = 0.18.

[0026] (2) Heating process: use 210mm cross-section steel billet to produce 15mm thick finished steel plate, the temperature of preheating section is controlled at 1050°C, the temperature of secondary heating is controlled at 1250°C, the temperature of soaking section is controlled at 1230°C, and the heating time is 210min.

[0027] (3) Controlled rolling and controlled cooling: the starting rolling temperature is 1100°C. In order to realize the refinement of the core grain structure of the billet, the single-pass reduction in the rough rolling link is 30mm, the thickness of the i...

Embodiment 2

[0031] (1) Composition design: In the technical plan, the steel plate 07MnNiVDR with a thickness of less than 60mm and a high-strength tempered pressure vessel contains the following mass percentages (unit, wt%): C: 0.08%, Si: 0.25%, Mn: 1.45%, P: 0.012%, S: 0.003%, Als: 0.022%, Ni: 0.36%, Cr: 0.23%, Mo: 0.17%, V: 0.030, others are Fe and residual elements, crack sensitivity coefficient Pcm = 0.19.

[0032] (2) Heating process: 300mm cross-section steel billet is used to produce 60mm thick finished steel plate, the temperature of the preheating section is controlled at 1040°C, the temperature of the second heating section is controlled at 1260°C, the temperature of the soaking section is controlled at 1250°C, and the heating time is 300min.

[0033] (3) Controlled rolling and controlled cooling: the starting rolling temperature is 1108°C. In order to realize the refinement of the core grain structure of the billet, the single-pass reduction in the rough rolling link is 25mm, t...

Embodiment 3

[0037] (1) Composition design: In the technical plan, the steel plate 07MnNiVDR with a thickness of less than 60mm and a high-strength tempered pressure vessel contains the following mass percentages (unit, wt%): C: 0.08%, Si: 0.25%, Mn: 1.41%, P: 0.011%, S: 0.003%, Als: 0.025%, Ni: 0.32%, Cr: 0.26%, Mo: 0.15%, V: 0.029, others are Fe and residual elements, crack sensitivity coefficient Pcm = 0.19.

[0038] (2) Heating process: use 300mm cross-section steel billet to produce 38mm thick finished steel plate, the temperature of preheating section is controlled at 1038°C, the temperature of secondary heating is controlled at 1255°C, the temperature of soaking section is controlled at 1247°C, and the heating time is 300min.

[0039](3) Controlled rolling and controlled cooling: the starting rolling temperature is 1110°C. In order to realize the refinement of the core grain structure of the steel billet, the single-pass reduction in the rough rolling link is 27mm, the thickness of ...

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Abstract

The invention discloses a production method of low-cost low-temperature high-strength steel 07MnNiVDR for containers, the thickness of a steel plate is smaller than or equal to 60 mm, the internal structure of the steel plate is tempered sorbite and bainite, the steel plate comprises the following chemical components: C, Si, Mn, P, S, Als, Ni, Cr, Mo, V and the balance Fe and residual elements, and the welding crack sensitivity coefficient Pcm of the steel plate is smaller than or equal to 0.21; the production method comprises the steps of heating, controlled rolling and controlled cooling, stack cooling and tempering. The mechanical property of the obtained steel plate at the 1 / 4 thickness position and the 1 / 2 thickness position meets GB / T19189-2011, the 5% strain aging impact property is guaranteed, the performance of the steel plate subjected to 620 DEG C simulated postweld heat treatment still meets the requirements of the GB / T19189-2011 standard, and specifically, the yield strength is larger than or equal to 490 MPa, the tensile strength is 610-730 MPa, the ductility is larger than or equal to 17%, and the transverse impact energy at-40 DEG C is larger than or equal to 80 J; and 5% strain aging-40 DEG C transverse impact energy is greater than or equal to 80J. Meanwhile, a controlled rolling, controlled cooling and tempering process is adopted to replace a traditional rolling, quenching and tempering process, the quenching process is omitted, and on the premise that the performance is guaranteed, shortening of the steel plate manufacturing period is facilitated, and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of medium and heavy plate production, in particular to a production method of low-cost low-temperature high-strength container steel 07MnNiVDR. Background technique [0002] 07MnNiVDR steel is widely used in petroleum, chemical industry, power station and other industries. It is mainly used to make reactors, heat exchangers, separators, spherical tanks, oil and gas tanks, boiler drums and other equipment components. It has many advantages: low welding crack sensitivity steel , with high yield strength and tensile strength, excellent low temperature toughness, etc. Therefore, it has become the most important structural material for pressure vessels, and our country is a country with large oil reserves, and its application range is wide and the demand is large. [0003] In the existing production method of pressure vessel steel, in order to ensure the low-temperature performance of the steel plate, the process of quenc...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C21D8/02
CPCC22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C21D8/0226C21D8/0263C21D2211/00C21D2211/002
Inventor 朱书成杨阳许少普李忠波刘庆波唐郑磊康文举薛艳生杨东全微波屈晓彬朱先兴任义王喜攀
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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