A kind of preparation method of dual-phase hot forming steel

A hot-forming steel and hot-forming technology, applied in the field of high-strength automotive steel, can solve the problems of increased difficulty in surface treatment process, surface oxidation, damage to the surface quality of steel plates, etc., to improve plasticity, low heating temperature, and reduce surface oxidation. Effect

Inactive Publication Date: 2011-12-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the austenitizing process, due to the high temperature, the surface oxidation is serious, which damages the surface quality of the steel plate and increases the difficulty for the subsequent surface treatment process.

Method used

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  • A kind of preparation method of dual-phase hot forming steel
  • A kind of preparation method of dual-phase hot forming steel
  • A kind of preparation method of dual-phase hot forming steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Heat the hot-rolled steel plate to 800°C, keep it warm for 5 minutes, and cool it to room temperature at a rate greater than 40°C / s, as shown in Figure 1(b). The microstructure and mechanical properties of the steel plate after hot forming simulation are as follows: figure 2 And as shown in Table 2. The microstructure of the steel plate after hot forming is ferrite + martensite dual phase microstructure.

Embodiment 2

[0029] Heat the hot-rolled steel plate to 820°C, keep it warm for 5 minutes, and cool it to room temperature at a rate greater than 40°C / s, as shown in Figure 1(b). The mechanical properties of the steel plate after hot forming simulation are shown in Table 2, and the microstructure is the same as that of Example 1. The microstructure of the steel plate after hot forming is ferrite + martensite dual phase microstructure.

Embodiment 3

[0031] Heat the hot-rolled steel plate to 850°C, keep it warm for 5 minutes, and cool to room temperature at a rate greater than 40°C / s, as shown in Figure 1(b). The mechanical properties of the steel plate after hot forming simulation are shown in Table 2, and the microstructure is the same as that of Example 1. The microstructure of the steel plate after hot forming is ferrite + martensite dual phase microstructure.

[0032] The chemical composition of table 1 embodiment (mass fraction / %)

[0033]

[0034] The mechanical property of table 2 embodiment

[0035] Numbering Thermoforming heating temperature / ℃ R p0.2 / MPa R m / MPa Embodiment one 800 720 1155 Embodiment two 820 770 1260 Embodiment three 850 780 1330

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Abstract

The invention provides a preparation method for double-phase forming steel, which belongs to the technical field of high-intensity steel for automobiles. The steel comprises the following ingredients by mass percent: 0.1 to 0.5 percent of C, 0.3 to 2.5 percent of Si, 1.0 to 3.0 percent of Mn, 1.0 to 3.0 percent of Al, at most 0.02 percent of P, at most 0.01 percent of S, at most 0.01 percent of Nand the balance iron and unavoidable impurities. A production process comprises the following steps of: smelting, hot rolling and hot forming process simulation after the hot rolling. The controlled process parameters are as follows: hot rolling plate blanks are heated to 1200 to 1250 DEG C, the heat insulation is carried out for 0.5 to 1 hour, the final rolling temperature is 800 to 900 DEG C, and the coiling temperature is 600 to 700 DEG C. The hot forming process comprises the following steps of: carrying out heat insulation for 5min at the heating temperature being 750 to 850 DEG C and cooling the materials to the room temperature at the speed greater than 40 DEG C/s. The preparation method adopts the Al micro alloying treatment. Compared with the traditional thermal forming manganeseboron steel, the double-phase forming steel has the advantages that: 1, the hot forming heating temperature is low, and the surface oxidation is reduced; and 2, tissues after the hot forming are ferrite and martensite double-phase tissues.

Description

technical field [0001] The invention belongs to the technical field of high-strength automobile steel, and in particular relates to a dual-phase hot forming steel and a preparation method thereof. Background technique [0002] With the development of the automobile industry, energy saving and emission reduction has become the focus of common attention in the world today. Automobile lightweight is the main measure to achieve this goal, and the current research focus of steel plate surface technology. [0003] Usually, ultra-high-strength automotive steel with a tensile strength greater than 1000MPa has a narrow range of plastic deformation due to its high strength, poor formability, and requires a large stamping force. When stamping and deforming at room temperature, it is easy to crack, and the springback of the parts after forming is serious, resulting in poor dimensional and shape stability of the parts, and it is more difficult to stamp and form parts with complex shape...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C21D8/02
Inventor 陈银莉程俊业苏岚靳海亮赵爱民
Owner UNIV OF SCI & TECH BEIJING
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