A zinc-coated hot-formed member with a tensile strength above 1800mpa and excellent cold-bending performance and a preparation method thereof

A technology for tensile strength and cold bending performance, applied in the field of zinc-coated thermoforming components and their preparation, can solve the problems of premature brittle fracture, increased strength, and adverse occupant safety of cold bending performance parts

Active Publication Date: 2020-10-27
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the strength increases, the corresponding plastic toughness will decrease. The important index for evaluating the plastic toughness of thermoformed steel is the three-point bending performance (refer to VDA238-100 for test standards)
Insufficient cold bending performance (bending limit angle) of materials or parts used in automobiles will lead to premature brittle fracture of parts during vehicle collision, which cannot effectively absorb the energy generated by the collision, and is not conducive to the safety of occupants

Method used

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  • A zinc-coated hot-formed member with a tensile strength above 1800mpa and excellent cold-bending performance and a preparation method thereof
  • A zinc-coated hot-formed member with a tensile strength above 1800mpa and excellent cold-bending performance and a preparation method thereof
  • A zinc-coated hot-formed member with a tensile strength above 1800mpa and excellent cold-bending performance and a preparation method thereof

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0053] Table 2 Preparation process parameters before thermoforming

[0054]

[0055] Table 3 Properties of steel sheet or strip before hot forming

[0056]

[0057] Table 4 Thermoforming process parameters

[0058]

[0059] Table 5 Mechanical properties after thermoforming

[0060]

[0061] The thermoforming heating temperature and heating holding time in Example 1 were respectively changed to the values ​​in Table 6, and the Γ phase ratio (%) of the resulting zinc-coated thermoformed member is shown in Table 6.

[0062] The relationship between table 6Γ phase ratio and heating temperature and time

[0063] Example Heating temperature °C Holding time min Γ phase ratio% 1 860 5 24.63 2 880 5 8.04 3 890 3 40.44 4 890 4 23.07 5 890 5 7.27 6 890 6 1.17 7 890 7 0.00

[0064] It can be seen from Table 6 that under the same holding time condition, the Γ phase decreases with the increase of the heating...

Embodiment 3

[0067] The microstructures of the thermoformed member containing the zinc coating layer obtained in Example 3 before and after thermoforming are respectively as follows: figure 1 , 2 As shown in Figures 1 and 2, it can be seen that the thickness of the decarburized layer of the steel strip after annealing is 25 μm, and the thickness of the decarburized layer after hot forming is 15 μm. ≈25%.

[0068] The polarization curve of the thermoformed member containing the zinc coating layer obtained in Example 3, the thermoformed member containing the Al-Si coating in Comparative Example 1, and the thermoformed member without the coating plate are as follows Figure 4 As shown, it can be seen from the figure that the electrode potential of the Zn-containing coating is lower than that of the substrate and the Al-Si coating. Therefore, it has a sacrificial anode protection effect in a corrosive environment, thereby improving corrosion resistance.

[0069] The corrosion performance and...

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Abstract

The invention discloses a thermal forming member containing a zinc coating layer and with tensile strength of grade 1800MPa and above and excellent cold bending property, and a preparation method thereof. A substrate of the thermal forming member containing the zinc coating layer comprises the following chemical components in percentage by weight: 0.29%-0.35% of C, not greater than 0.5% of Si, 0.5%-1.5% of Mn, not greater than 0.020% of P, not greater than 0.010% of S, not greater than 0.50% of Cr, 0.01%-0.06% of Al, 0.01%-0.06% of Nb, 0.01%-0.06% of V, not greater than 0.5% of Mo, and the balance Fe and inevitable impurities; and the substrate is prepared through the steps of smelting, continuous casting, hot rolling, acid washing, annealing, hot-dip galvanizing, online alloying, trimmingand thermal forming. The thermal forming member containing the zinc coating layer is excellent in mechanical property, corrosion resistance and welding property.

Description

technical field [0001] The invention belongs to the technical field of thermoformed steel, and in particular relates to a zinc-coated thermoformed component with a tensile strength above 1800 MPa and excellent cold bending performance and a preparation method thereof. Background technique [0002] Automobile lightweight technology is one of the key technologies to adapt to the trend of modern automobile safety, energy saving and environmental protection. At present, more and more automobile body parts use thermoforming technology (such as: automobile bumpers, anti-collision beams, A-pillars, B-pillars , door bumper, etc.). Thermoforming technology is a new process that divides forming and strengthening into two steps to produce ultra-high-strength auto parts. The produced parts have the advantages of ultra-high strength, high forming precision, and no springback. [0003] With the continuous development of hot forming technology, the amount of hot stamping steel is also inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C21D8/02C21D1/74C21D1/26C23C2/06C23C2/40
CPCC21D1/26C21D1/74C21D8/0226C21D2211/008C22C38/002C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C23C2/06C23C2/40
Inventor 崔磊晋家春刘永刚詹华谷海容李子涛王蕾陈乐王伟峰肖洋洋董标
Owner MAANSHAN IRON & STEEL CO LTD
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