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Duplex stainless steel steel bar and preparation method thereof

A technology of duplex stainless steel and steel bar, applied in the field of high-strength stainless steel, can solve the problems of high price, unfavorable popularization and application of duplex stainless steel bar, increase of production cost of stainless steel bar, etc., and achieve the effect of improving yield strength and tensile strength

Active Publication Date: 2019-03-05
CENT IRON & STEEL RES INST +1
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Problems solved by technology

In the prior art, duplex stainless steel is used to produce steel bars. During the rolling process, the cumulative deformation of the steel bars is large, and the yield strength of the steel bars is above 650 MPa. The excessively high strength exceeds the design requirements for the use of 500 MPa grade stainless steel bars.
[0004] Although, by increasing the content of Ni and Cr in stainless steel bars, it can meet the requirements of 500MPa stainless steel bars, but there are no production data and literature reports for 2205 duplex stainless steel bars. The content of Ni and Cr will increase the production cost of stainless steel bars, which is not conducive to the promotion and application of duplex stainless steel bars

Method used

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  • Duplex stainless steel steel bar and preparation method thereof
  • Duplex stainless steel steel bar and preparation method thereof

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Embodiment Construction

[0030] Preferred embodiments of the present invention are specifically described below.

[0031] In the first aspect, the present invention provides a duplex stainless steel bar, which improves the yield strength and tensile strength of the duplex stainless steel bar by adding microalloying elements on the basis of the composition of 2205 stainless steel. The alloy composition of the duplex stainless steel bar consists of The mass percentages are: C≤0.03%, Si 0.20%~0.80%, Mn 0.80%~1.60%, Cr21.00%~23.00%, Ni 4.50%~5.50%, Mo 2.50%~3.50%, Nb 0~0.05 %, V 0-0.16%, Ti 0-0.02%, N 0.15%-0.20%, P≤0.020%, S≤0.010%, and the balance is Fe and unavoidable impurity elements.

[0032] Wherein, the so-called microalloying elements refer to one or more of Nb, V and Ti. It should be noted that since the design idea of ​​the present invention is to increase the yield strength and tensile strength of the solution-treated duplex stainless steel bar by adding microalloy elements, therefore, there ...

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Abstract

The invention relates to a double-phase stainless steel bar and a preparation method thereof and belongs to the technical field of high-strength stainless steel. The alloy components of the double-phase stainless steel bar comprise C, Si, Mn, Cr, Ni, Mo, micro alloy elements, N, P, S and Fe. The micro alloy elements are one or more of Nb, V and Ti. Through smelting, continuous casting, hot rolling, cooling and solution treatment, the double-phase stainless steel bar is obtained. Under the premise that the production cost is basically unchanged, the yield strength of the double-phase stainless steel bar is improved, and thus the double-phase stainless steel bar can meet the 500 MPa-level stainless steel bar requirement; and meanwhile the corrosion resistance of the double-phase stainless steel bar is improved, and thus the double-phase stainless steel bar can meet the marine environment priority project requirement.

Description

Technical field [0001] The invention relates to a high-strength stainless steel, and in particular to a duplex stainless steel steel bar and a preparation method thereof. Background technique [0002] In the marine environment, the corrosion of concrete building structures by chloride ions is the most serious, which makes conventional plain carbon steel and low alloy steel steel bars unable to be used in harsh marine corrosive environments. [0003] Duplex stainless steel has excellent resistance to chloride ion corrosion, making it suitable for the development of steel bar materials of different strength levels. In the existing technology, duplex stainless steel is used to produce steel bars. During the rolling process, the cumulative deformation of the steel bars is large, and the yield strength of the steel bars is above 650MPa. The excessive strength exceeds the design requirements for the use of 500MPa grade stainless steel steel bars. [0004] Although by increasing t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/04C22C38/50C22C38/48C22C38/46C22C38/44C22C33/04C21D8/08
CPCC21D8/065C21D8/08C22C33/04C22C38/001C22C38/04C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 陈颖杨忠民王慧敏李昭东雍岐龙
Owner CENT IRON & STEEL RES INST
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