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Low-carbon-equivalent 1180 MPa-grade hot galvanizing dual-phase steel and production method thereof

A production method and carbon equivalent technology, applied in hot-dip plating process, coating, metal material coating process, etc., can solve the problems of low cost, steel cannot meet high strength and high yield strength at the same time, and achieve hardenability improvement properties, significant nano-precipitation effects, and excellent mechanical properties

Active Publication Date: 2021-03-19
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is that the existing steel cannot satisfy the problem of high strength, high yield strength and low cost at the same time.

Method used

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  • Low-carbon-equivalent 1180 MPa-grade hot galvanizing dual-phase steel and production method thereof
  • Low-carbon-equivalent 1180 MPa-grade hot galvanizing dual-phase steel and production method thereof
  • Low-carbon-equivalent 1180 MPa-grade hot galvanizing dual-phase steel and production method thereof

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Embodiment

[0042] The scheme of the present invention can specifically be implemented in the following manner:

[0043] This embodiment provides two groups of low-carbon equivalent 1180MPa grade hot-dip galvanized dual-phase steels as Example 1 and Example 2, and its composition is as shown in Table 1;

[0044] Table 1 Chemical Composition of Duplex Steel (wt.%)

[0045]

[0046] The production method of the above-mentioned 1180MPa grade hot-dip galvanized dual-phase steel whose tensile strength is low carbon equivalent, the specific process is as follows:

[0047] a. Smelting process: through the smelting process, prepare a dual-phase steel slab with the chemical composition shown in Table 1;

[0048] b. Hot rolling process: the slab is heated, dephosphorized, hot rolled and laminar cooled to obtain a hot rolled coil. The specific hot rolling process parameters are shown in Table 2.

[0049] Table 2 Main process parameters of hot rolling of dual-phase steel

[0050] exam...

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Abstract

The invention discloses low-carbon-equivalent 1180 MPa-grade hot galvanizing dual-phase steel and a production method thereof, and belongs to the technical field of cold-rolled plate strip production.The low-carbon-equivalent 1180 MPa-grade hot galvanizing dual-phase steel comprises the following chemical components including, by mass percent, 0.05-0.14% of C, 0.05-0.40% of Si, 1.20-2.50% of Mn,less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.015-0.070% of Als, less than or equal to 0.0060% of N, 0.006-0.20% of Mo, 0.010-0.040% of Nb, 0.010-0.040% of Ti, 0.20-0.67% ofCr, larger than 0 and less than 0.005% of B, and the balance Fe and inevitable impurities. The production method comprises the processes of smelting, hot rolling, acid rolling, hot galvanizing and thelike. According to the low-carbon-equivalent 1180 MPa-grade hot galvanizing dual-phase steel and the production method thereof, the steel has excellent mechanical properties, the yield strength is 880-960 MPa, the tensile strength is 1193-1276 MPa, the elongation A80 is 6.0-10.0%, and the problem that the steel cannot meet the requirements of high strength, high yield strength and low cost at thesame time can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of cold-rolled strip production, and in particular relates to a 1180MPa dual-phase steel produced by continuous hot-dip galvanizing and a production method thereof. Background technique [0002] At present, the tensile strength grades of the research and application of galvanized advanced high-strength steel are mostly below 1000MPa, and there are few reports on galvanized advanced high-strength steel with tensile strength of 1200MPa. The highest level of steel used in cold-formed auto parts is 1200MPa, which is mainly used in anti-collision beams, B-pillars, door sills and other parts for collision safety to prevent deformation of the cockpit and improve collision safety. At the same time, the use of 1200MPa grade cold-rolled dual-phase steel will further meet the needs of automobile lightweight and energy emission reduction. [0003] The Chinese national standard GB / T20564.2-2017 stipulates that the mecha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/38C22C38/06C22C38/22C22C38/26C22C38/28C22C38/32C21D8/02C23C2/06C23C2/40
CPCC22C38/02C22C38/04C22C38/38C22C38/06C22C38/22C22C38/26C22C38/28C22C38/32C21D8/0205C21D8/0226C21D8/0447C23C2/06C23C2/40C21D2211/005C21D2211/008C21D2211/002
Inventor 余灿生郑之旺王敏莉郑昊青
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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