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Low-cost 700 MPa-grade hot-dip galvanized complex-phase steel plate and preparation method thereof

A low-cost, hot-dip galvanizing technology, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problems of poor mechanical properties of hot-dip galvanized composite steel sheets

Active Publication Date: 2021-09-07
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the poor mechanical properties of the existing 700MPa hot-dip galvanized composite steel plate

Method used

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  • Low-cost 700 MPa-grade hot-dip galvanized complex-phase steel plate and preparation method thereof
  • Low-cost 700 MPa-grade hot-dip galvanized complex-phase steel plate and preparation method thereof
  • Low-cost 700 MPa-grade hot-dip galvanized complex-phase steel plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] The preparation method of the above-mentioned low-cost 700MPa hot-dip galvanized composite steel plate comprises the following steps:

[0030] a. Smelting process: smelting according to the chemical composition of low-cost 700MPa hot-dip galvanized composite steel plate, and casting it into a slab;

[0031]b. Hot rolling process: the slab is heated, dephosphorized, rough rolled, finish rolled and laminar flow cooled to obtain hot rolled coils. The final rolling temperature is controlled at 860-910°C. The cooling rate is 45-55% and 70-80% respectively, and the coiling temperature is 500-550°C;

[0032] c. Pickling process: pickling the hot-rolled coils and then cold-rolling them to obtain thin steel strips. The thickness of the steel strips is controlled to be 0.7-2.5mm, and the reduction ratio is 50-74%;

[0033] d. Hot-dip galvanizing process: first, the thin strip steel is heated to 300°C, 700°C and 770-790°C in sections at a rate of 15-20°C / s, 4-10°C / s and 0.5-3°C / s...

Embodiment

[0039] This example provides two sets of low-cost 700MPa grade hot-dip galvanized multiphase steel sheets prepared by the method of the present invention, the chemical composition of which is shown in Table 1.

[0040] Table 1 Chemical composition of cold-rolled dual-phase steel (wt.%)

[0041] C Si mn P S N als Cr V Example 1 0.100 0.35 1.75 0.009 0.002 0.0024 0.035 0.37 0.083 Example 2 0.105 0.42 1.82 0.008 0.002 0.0032 0.043 0.42 0.090

[0042] The preparation method of the above-mentioned low-cost high-strength hot-dip galvanized high-strength steel plate, the specific process is as follows:

[0043] A. Smelting process: Through the smelting process, a dual-phase steel slab with the chemical composition shown in Table 1 is prepared.

[0044] B. Hot-rolling process: hot-rolled coils are obtained after the slab is heated, dephosphorized, hot-rolled and laminar cooling. The specific hot-rolling process parameters are show...

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Abstract

The invention discloses a low-cost 700 MPa-grade hot-dip galvanized complex-phase steel plate and a preparation method thereof, and belongs to the technical field of cold-rolled strip production. The low-cost 700 MPa-grade hot-dip galvanized complex-phase steel plate comprises, by weight, 0.08-0.13% of C, 0.10-0.50% of Si, 1.60-1.90% of Mn, 0.015-0.070% of Als, less than or equal to 0.020% of P, less than or equal to 0.010% of S, less than or equal to 0.0060% of N, 0.06-0.10% of V, 0.20-0.50% of Cr and the balance Fe and inevitable impurities. The preparation method comprises the procedures of smelting, hot rolling, acid rolling, hot dip galvanizing and the like. Through reasonable matching of the components and the process, the yield strength of the prepared steel plate ranges from 410 MPa to 490 MPa, the tensile strength ranges from 720 MPa to 780 MPa, the elongation A80 ranges from 17.0% to 25.0%, and the hole expansion rate ranges from 53.0% to 68.0%. The preparation method is simple in process control and low in production cost, and can effectively solve the problem that an existing 700 MPa-grade hot-dip galvanized complex-phase steel plate is poor in mechanical property.

Description

technical field [0001] The invention belongs to the technical field of cold-rolled strip production, and relates to a hot-dip galvanized composite steel produced by continuous hot-dip galvanizing, in particular to a low-cost 700MPa hot-dip galvanized composite steel sheet and a preparation method thereof. Background technique [0002] In recent years, with the development of the automobile industry and the needs of energy saving and emission reduction, the steel used in automobiles has gradually developed into high-strength steel, and at the same time, the number of formed parts such as bending and flanging used in high-strength steel is increasing. The traditional high-strength steel is mainly dual-phase steel, whose structure is mainly composed of soft ferrite matrix and high-strength martensite, which is suitable for the production of stamping parts; but due to the soft and hard ferrite and martensite The difference in phase hardness is large, and its bending performance ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/38C22C38/06C22C38/24C21D8/02C23C2/06C23C2/40C23F17/00
CPCC22C38/02C22C38/38C22C38/06C22C38/24C22C38/001C21D8/0205C21D8/0226C21D8/0278C21D8/0247C23C2/06C23C2/40C23F17/00C21D2211/005C21D2211/008C21D2211/002
Inventor 余灿生郑之旺王敏莉周伟郑昊青苏冠侨
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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