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A method for preparing hot-dip galvanized warm-formed high-strength medium-manganese steel parts

A warm forming, high-strength technology, applied in hot-dip plating process, coating, metal material coating process, etc., to achieve the effect of improving adhesion, improving efficiency, and good surface cleanliness

Active Publication Date: 2018-09-04
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] According to the above-mentioned technical problems in the traditional hot-dip galvanizing process, such as the secondary heating treatment and the influence of the coating on the austenitization heating efficiency of the plate in the subsequent forming process, a combination of hot-dip galvanizing and warm forming process is provided to prepare Preparation method of high-strength medium manganese steel parts

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  • A method for preparing hot-dip galvanized warm-formed high-strength medium-manganese steel parts
  • A method for preparing hot-dip galvanized warm-formed high-strength medium-manganese steel parts
  • A method for preparing hot-dip galvanized warm-formed high-strength medium-manganese steel parts

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preparation example Construction

[0025] A preparation method for hot-dip galvanized warm-formed high-strength medium-manganese steel parts, comprising the following steps (such as figure 1 shown):

[0026] S1. Select the smelted, hot-rolled, and cold-rolled medium manganese steel plate for derusting and degreasing treatment in advance as the steel piece to be used. The chemical composition weight percentage of the medium manganese steel plate is: C: 0.05-0.50%; Mn: 4.0-6.0%; Al: 0.015-0.060%; P≤0.015%; S≤0.02%, the rest is Fe and unavoidable impurities; on the basis of the chemical composition of the medium manganese steel plate, one of the following weight percentages is added Or multiple elements: Ni: 0.1-3.0%; Cr: 0.2-3.0%; Mo: 0.1-0.8%; Cu: 0.5-2.0%; B: 0.0005-0.005%; Nb: 0.02-0.10%; [N] : 0.002-0.25%; Ti: 0.05-0.25%; V: 0.02-0.25%; Re: 0.002-0.005%; Ca: 0.005-0.03%;

[0027] S2. Heat the steel parts to be used in a vacuum heating furnace to the austenitization temperature to avoid oxidation of the stee...

Embodiment 1

[0031] The weight percentage of the chemical composition of the selected medium manganese steel parts is: C: 0.1%; Mn: 5.0%; Al: 0.06%; P: 0.013%; S: 0.01%, the rest is Fe and inevitable impurities; It can be seen from the curve that the high-strength steel M s The point is around 310°C.

[0032] The preparation method comprises the following steps:

[0033] S1, making the medium manganese steel plate of the above composition into a steel piece for use;

[0034] S2. Heat the steel piece to be used to 850°C in a vacuum heating furnace and keep it warm for 4 minutes; in the cooling chamber where the protective gas is nitrogen, cool the steel piece to 500°C at a cooling rate of 20°C / s;

[0035] S3. Put the steel parts to be used into the constant temperature galvanizing tank, the temperature in the tank is 500°C, and keep warm for 50s;

[0036] S4. After the galvanizing is finished, the steel parts to be used are thermally dried and transferred to the mold. According to the in...

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Abstract

The invention provides a method for preparing a high-strength medium manganese steel piece through hot dip galvanizing and warm forming. The method is characterized by including the following steps that a medium manganese steel plate serves as a to-be-used steel piece; the to-be-used steel piece is heated to be at the austenitizing temperature, the heating temperature ranges from 750 DEG C to 850 DEG C, and the temperature is kept for 3 minutes to 5 minutes; the temperature is reduced to be 500 DEG C in a cooling cavity filling with protection gas, then the product is put into a constant-temperature galvanizing bath, the temperature in the bath ranges from 480 DEG C to 500 DEG C, and the temperature is kept for 5 s to 60 s; the to-be-used steel piece is subjected to heat drying treatment in the process that the to-be-used steel piece is transferred to a mold, and then is put on the mold, subjected to warm forming and quenched till the temperature is the room temperature, and the high-strength medium manganese steel piece with the preset shape and a zinc coating layer is obtained. By means of the preparing method, the compound technology that warm-forming medium manganese steel and hot-dip galvanizing treatment are completed at the same time is achieved, the technological process is simplified, the efficiency is improved, and energy is saved.

Description

technical field [0001] The invention belongs to the technical field of high-strength steel plates for automobiles, in particular to a method for preparing hot-dip galvanized warm-formed high-strength medium-manganese steel parts. Background technique [0002] Auto parts are required to have good corrosion resistance while requiring lightweight, energy saving, consumption reduction, and improved collision safety. Generally, surface oxidation occurs during high temperature heat treatment, transfer, and forming of uncoated steel sheets in an environment without vacuum or gas protection. For the warm and hot forming process of high-strength steel for vehicles, usually the stamping and quenching treatments are exposed to the air, and oxidation is difficult to avoid, resulting in the failure of the surface properties of the steel parts, and the resulting scale seriously affects the service life of the mold . At present, hot-dip galvanizing is a relatively mature and effective te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06C23C2/28
CPCC23C2/06C23C2/28
Inventor 常颖李晓东王存宇任大鑫赵坤民郑国君
Owner DALIAN UNIV OF TECH
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