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Preparation method of high-strength hot galvanizing Q&P steel

A hot-dip galvanizing, high-strength technology, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problems of reducing the amount of paralyzed, destroying the strong plastic accumulation and formability of steel plates, and achieving cost savings , excellent mechanical properties, the effect of simplifying the production process

Inactive Publication Date: 2015-05-20
DALIAN UNIV OF TECH
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Problems solved by technology

[0004] The traditional hot-dip galvanizing process is aimed at ordinary steel plates (including steel plates made by Q&P process). Heating and dipping process steps in the galvanizing tank at ℃, which will inevitably lead to secondary heating of the steel plate, and the amount of residual metal will be reduced when the temperature is raised again, so as to destroy the strong plastic product and formability of the steel plate

Method used

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  • Preparation method of high-strength hot galvanizing Q&P steel
  • Preparation method of high-strength hot galvanizing Q&P steel

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preparation example Construction

[0027] A preparation method of high-strength hot-dip galvanized Q&P steel, comprising the steps of:

[0028] S1, low-carbon alloy steel is made into ready-to-use steel piece, and the chemical composition weight percentage of this low-carbon alloy steel is:

[0029] C: 0.1-0.51%; Al: 1.0-2.5%; Si: 0-2.0%; Mn: 0-1.5%; Cr: 0-1.1%; Ni: 0-3.0%; V: 0-0.2%; Mo : 0~0.7%; Nb: 0~0.05%; P≤0.015%; S≤0.005%; N≤0.006%; O≤30ppm; the balance is Fe and unavoidable impurities;

[0030] S2. Heat the steel piece to be used in a vacuum high-temperature furnace to austenitizing temperature 780°C-950°C, and keep it warm for 3-5 minutes; in a cooling chamber using nitrogen or argon as a protective gas, it is cooled to M after one quenching s Dot and M f Between points, keep warm for 0.5 to 3 minutes, and the cooling rate for primary quenching is not less than 10°C / s;

[0031] S3. After one heating, the heating rate is 10°C / s, heating to 450°C-500°C, carrying out partitioning treatment, keeping the...

Embodiment 1

[0034] The chemical composition of selected low-carbon alloy steel is calculated by weight percentage: C: 0.21%; Al: 2.0%; Si: 0.8%; Mn: 0.20%; Cr: 1.0%; Ni: 2.86%; Mo: 0.31%; V : 0.08%; Nb: 0.04%; S: 0.0007%; P: 0.006%, and the rest are Fe and unavoidable impurities.

[0035] The preparation method comprises the following steps:

[0036]S1, making the low-carbon alloy steel of the above composition into a ready-to-use steel piece;

[0037] S2. Heat the steel piece to 900°C in a vacuum high-temperature furnace and keep it warm for 5 minutes; in the cooling chamber where the protective gas is nitrogen, cool the steel piece to 330°C at a cooling rate of 10°C / s, that is, M s with M f Between temperatures, keep warm for 60s;

[0038] S3. Heat the steel piece to 460°C at a heating rate of 10°C / s, and immerse it directly and quickly (that is, when holding for 0 minutes) into a constant temperature galvanizing tank at 460°C for dipping and partitioning treatment, and the holding t...

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Abstract

The invention discloses a preparation method of high-strength hot galvanizing Q&P steel. The preparation method is characterized by comprising the following steps: preparing low-carbon alloy steel into a to-be-used steel product; heating the to-be-used steel product to an austenitizing temperature and keeping the temperature for 3-5 minutes; performing primary quenching cooling in a cooling cavity with a protective gas until the temperature is between an Ms point and an Mf point, and keeping the temperature for 0.5-3 minutes; heating to 450-500 DEG C, performing distribution processing, keeping the temperature for 0-5 minutes, quickly adding into a constant-temperature galvanizing bath isothermal with the steel product, performing hot galvanizing, further performing distribution processing, and keeping the temperature for 10-60 seconds; and performing secondary quenching cooling until the temperature is reduced to the room temperature. By adopting the preparation method disclosed by the invention, the aim of simultaneously finishing a Q&P process and hot galvanizing treatment is achieved, the process flow is simplified, the production efficiency is improved, and high-strength hot galvanizing alloy steel is prepared.

Description

technical field [0001] The invention belongs to the technical field of high-strength steel plates for automobiles, and relates to a preparation method of high-strength hot-dip galvanized Q&P (Quenched and Partitioned) steel. Background technique [0002] In recent years, in order to meet the technical requirements of automobile lightweight and safety, in terms of automobile steel, the development and large-scale adoption of high-strength and ultra-high-strength steel plates have become the joint efforts of major scientific research institutes, automobile manufacturers and steel manufacturers. According to the direction, the first, second and third generation of automotive steels have been successively developed, including dual-phase steels (DP steels) and TRIP steels of different strength levels. As an advanced third-generation automotive steel, Q&P steel has the advantages of high strength, high strength and plasticity due to the ability to obtain a certain amount of retain...

Claims

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Application Information

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IPC IPC(8): C22C38/48C21D1/18C23C2/06C23C2/40
CPCC21D1/18C22C38/02C22C38/04C22C38/06C22C38/08C22C38/18C23C2/06
Inventor 常颖赵坤民任大鑫王存宇李晓东李冠中郑国君李树娟靳菲
Owner DALIAN UNIV OF TECH
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