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Steel hot-stamped product with aluminum or aluminum alloy plating layer and manufacturing method thereof

A manufacturing method and aluminum alloy technology, applied in metal material coating process, coating, hot-dip plating process, etc., can solve problems such as unspecified stamping process, different appearance and color of stamped products, and changes in furnace atmosphere

Active Publication Date: 2017-03-01
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN101583486 discloses hot stamping products and methods of coated steel strips, including heating, transfer and cooling, but does not involve the hot stamping process, including stamping parameters such as mold clamping speed and holding time, which will cause stamping products Unstable quality, such as shrinkage, cracking, etc., does not control the atmosphere of the furnace during the heating process, resulting in changes in the atmosphere in the furnace during the heating process, especially a large change in the oxygen content, resulting in easy changes in the appearance and color of the product. The actual production It is found that the appearance and color of the stamped products obtained from the same incoming material under the same process are quite different
[0005] Chinese patent CN104384283 discloses a hot stamping forming process of 22MnB5 high-strength thin steel plate, which is mainly aimed at bare plate hot stamping steel, and the stamping process is not specified

Method used

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  • Steel hot-stamped product with aluminum or aluminum alloy plating layer and manufacturing method thereof
  • Steel hot-stamped product with aluminum or aluminum alloy plating layer and manufacturing method thereof
  • Steel hot-stamped product with aluminum or aluminum alloy plating layer and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The 1.2mm aluminum alloy coated steel plate is laser blanked into a billet of a certain size and shape. The hot-dip plating solution consists of Si: 8.5%, Fe: 2.6%, and the rest is aluminum and unavoidable impurities. The billet enters the heating furnace, and the heating furnace The temperature is 950°C, the residence time is 3.5min, the oxygen content in the atmosphere in the furnace is 20%, it is transferred to the mold within 10s, the clamping speed is 100mm / s, the holding time is 10s, and the holding pressure is 10MPa. The appearance of the obtained product is as follows: image 3 As shown, the cross-sectional microstructure of the coating is as Figure 4 As shown, the proportion of martensite in the microstructure of the obtained hot stamping product substrate is higher than 95%, the hardness HV10 is 450, the total thickness of the coating is 43 μm, and the thickness of the alloy layer is 12 μm.

Embodiment 2

[0063] The 0.9mm aluminum alloy coated steel plate is laser blanked into a billet of a certain size and shape. The hot-dip plating solution consists of Si: 8.3%, Fe: 2.4%, and the rest is aluminum and unavoidable impurities. The billet enters the heating furnace, and the heating furnace The temperature is 940°C, the residence time is 5min, the oxygen content of the atmosphere in the furnace is 22%, it is transferred to the mold within 5s, the mold clamping speed is 50mm / s, the holding time is 4s, and the holding pressure is 8MPa. The proportion of martensite in the microstructure of the obtained hot stamping product substrate is higher than 97%, the hardness HV10 is 480, the total thickness of the coating is 50 μm, the thickness of the alloy layer is 15 μm, and the microstructure of the coating cross section is as follows: Figure 5 shown.

Embodiment 3

[0065] The 1.0mm aluminum alloy coated steel plate is laser blanked into a billet of a certain size and shape. The hot-dip plating solution consists of Si: 9.0%, Fe: 2.7%, and the rest is aluminum and unavoidable impurities. The billet enters the heating furnace, and the heating furnace The temperature is 930°C, the residence time is 7min, the oxygen content of the atmosphere in the furnace is 18%, it is transported to the mold within 8s, the mold clamping speed is 70mm / s, the holding time is 6s, and the holding pressure is 12MPa. The proportion of martensite in the microstructure of the substrate of the obtained hot stamping product is higher than 96%, the hardness HV10 is 490, the total thickness of the plating layer is 41 μm, and the thickness of the alloy layer is 11 μm. Figure 6 is the surface SEM morphology of hot stamping products, from Figure 6 It can be seen that the SEM appearance of the hot stamping product described in Example 3 of the present invention has certa...

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Abstract

The invention discloses a manufacturing method of a steel hot-stamped product with an aluminum or aluminum alloy plating layer. The manufacturing method comprises the following steps: 1) blanking: a steel plate with the aluminum or aluminum alloy plating layer is machined to a part blank with a needed shape by a blanking or laser cutting method; and the thickness of the steel plate with the plating layer is not more than 2.8 mm; 2) blank heat treatment: the blank is put in a heating furnace for heating and insulation; the temperature of the heating furnace is 900-950 DEG C; the atmosphere in the heating furnace guarantees the oxygen content to be more than 15%; and the total stop time of the blank in the heating furnace is 2.5-10 minutes; 3) blank transmission: the heated blank is quickly conveyed into a mold for punching; the conveying time is 4-12 seconds; and the temperature of the blank before punching is 680-750 DEG C; and 4) blank hot stamping: the heated blank is directly punched in the mold; the mold is cooled in the punching process; and the surface temperature of the mold before punching is lower than 100 DEG C.

Description

technical field [0001] The invention relates to a hot stamping product and a manufacturing method thereof, in particular to a steel hot stamping product with an aluminum or aluminum alloy coating and a manufacturing method thereof. Background technique [0002] In recent years, high-strength thinning, energy saving and emission reduction have been the main development trends of the automotive industry. Among them, hot stamping is a common way to achieve high-strength products. It is a combination of heat treatment and high-temperature forming to achieve high-strength products. . Commonly used hot stamping products mainly include: front and rear door left and right anti-collision bars (beams), front and rear bumpers, A-pillar reinforcement plates, B-pillar reinforcement plates, C-pillar reinforcement plates, floor middle channels, roof reinforcement beams, etc. Structural parts, these hot stamping products have the characteristics of high strength, complex shape, good formab...

Claims

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Application Information

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IPC IPC(8): B21D53/88C22C38/02C22C38/04C22C38/06C22C38/32C22C38/60C23C2/12C23C2/40
CPCB21D53/88C22C38/02C22C38/04C22C38/06C22C38/32C22C38/60C23C2/12C23C2/40
Inventor 刘昕洪振军谭宁金鑫焱刘俊祥洪继要
Owner BAOSHAN IRON & STEEL CO LTD
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