Production method of 590MPa-grade formability-enhanced hot-dip galvanized dual-phase steel

A production method and hot-dip galvanizing technology, applied in the field of steel rolling, can solve problems such as being unsuitable for mass production in factories, achieve uniform color and no defects, improve the adhesion of zinc layer, good elongation and work hardening characteristics.

Active Publication Date: 2021-07-02
SD STEEL RIZHAO CO LTD
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Problems solved by technology

[0003] At present, the existing technology improves the drawing performance by adding different alloy elements on the basis of the traditional dual-phase steel DP590, and clarifies the production method, processing method or manufacturing method, such as the patent with the publication number CN11117

Method used

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  • Production method of 590MPa-grade formability-enhanced hot-dip galvanized dual-phase steel
  • Production method of 590MPa-grade formability-enhanced hot-dip galvanized dual-phase steel
  • Production method of 590MPa-grade formability-enhanced hot-dip galvanized dual-phase steel

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Embodiment Construction

[0039] Here are the specific embodiments of the present invention, the technical solutions of the present invention are further described, but the scope of the invention is not limited to these embodiments. Any change or equivalent substitution that does not depart from the concept of the present invention is included within the scope of the invention.

[0040] The embodiment of the present invention has a 590 MPa-level enhanced molded hot-dip galvanized double phase steel and its production method, including the following steps:

[0041] 1) Smelting the steel water, and cast into a continuous cast blank with high aluminum steel protection and continuous casting mode; wherein the continuous casting of the whole process is argonized to avoid steel oxidation; using a medium-carbon cover to avoid steel water naked, two cold water according to the model Mode, use high-aluminum steel protection; the continuous casting process uses protective slag, the protective residue composition con...

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Abstract

The invention provides a production method of 590MPa-grade formability-enhanced hot-dip galvanized dual-phase steel. C-Si-Mn-Al-Ti is adopted as a basic alloy system, a certain amount of stable retained austenite is introduced on the basis of a traditional dual-phase steel ferrite and martensite microstructure at a low alloy cost, and through the TRIP effect generated by the retained austenite in the deformation process and optimization to the processes of finish rolling, continuous annealing and galvanizing, the product mechanical properties meet the conditions that the yield strength is 380-390 MPa, the tensile strength is 625-640 MPa, the ductility is 27-29%, and the n value is 0.16-0.18. The galvanized surface is uniform in color and free of defects, an inhibition layer is continuous and compact, zinc layer adhesive force ball punching reaches the first level, the coating and steel base bending experiment is qualified, and the complex part forming requirement and the surface quality requirement are met.

Description

Technical field [0001] The present invention relates to the field of rolling steel, and more particularly to a production method of 590 MPa-level reinforced molded hot-dip galvanized double phase steel. Background technique [0002] In order to realize the use of car safety, improve car safety, advanced high-strength steel in the white car is increasing, and the double phase steel has become the largest steel from advanced high-strength steel due to good comprehensive mechanical properties. However, the strength of the steel sheet is improved, which is usually caused to form a complex stamped structure of the automobile, and the traditional DP steel is difficult to form on many high-alted parts, and it is difficult to meet the complex stamped structural parts of the automobile, and use TRIP steel Then lead to a high alloy content, severe welding problem, and the elongation is wasteful. Therefore, DP steel having a TRIP effect is developed, and high ductility DP steel has good eco...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14B22D11/111C21D8/02C21D1/26C23C2/06C23C2/40C23F17/00
CPCC22C38/02C22C38/04C22C38/06C22C38/14C22C38/001B22D11/111C21D8/0205C21D8/0236C21D8/0226C21D8/0247C21D1/26C23C2/06C23C2/40C23F17/00C21D2211/005C21D2211/008C21D2211/001Y02P10/20
Inventor 田祥省胡华东徐国军刘培星侯晓英任东曹光明雷凯张康查凯董立华
Owner SD STEEL RIZHAO CO LTD
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