Aluminum-plated steel sheet for hot pressing with rapid heating, process for producing same, and method of hot-pressing same with rapid heating

一种快速加热、制造方法的技术，应用在制造工具、热浸镀工艺、照明和加热设备等方向，达到杜绝流挂、提高生产性、降低延迟破坏的风险的效果

Active Publication Date: 2011-06-08
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Hot pressing is expected to be a forming method for ultra-high-strength parts, but since the steel plate is usually heated in the atmosphere, oxides (fouling) are generated on the surface of the steel plate

Method used

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  • Aluminum-plated steel sheet for hot pressing with rapid heating, process for producing same, and method of hot-pressing same with rapid heating
  • Aluminum-plated steel sheet for hot pressing with rapid heating, process for producing same, and method of hot-pressing same with rapid heating
  • Aluminum-plated steel sheet for hot pressing with rapid heating, process for producing same, and method of hot-pressing same with rapid heating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142] The present invention will be further specifically described below in conjunction with examples.

[0143] Hot-dip aluminum plating was performed using cold-rolled steel sheets (thickness 1.2 mm) having steel compositions shown in Table 1 that had undergone conventional hot-rolling and cold-rolling steps as materials. As hot-dip aluminum plating, a non-oxidizing furnace-reduction furnace type pipeline is used, and the amount of plating on one side is adjusted to 20 to 100 g / m by the gas wiping method after plating 2 , and then cooled. The plating bath composition at this time was Al-9%Si-2%Fe. The Fe in the bath comes from the plating equipment and steel strip in the bath and is inevitably introduced. The plating appearance was good, and non-plating and the like did not occur.

[0144] Then, the steel sheet was subjected to box annealing in a coiled state. Conditions of box annealing are set to air atmosphere, 540 to 780° C., and 1 to 100 hours. After annealing, a b...

Embodiment 2

[0156] In the same manner as in Example 1, cold-rolled steel sheets (thickness 1.2 mm) having various steel components shown in Table 3 were subjected to hot-dip aluminum plating. Make the coating weight 60g / m on one side 2 . These aluminum-coated steel sheets were heated at 620° C. for 8 hours using a box anneal.

[0157] Then, it heated to the attainment temperature of 900 degreeC by electric heating at the average temperature increase rate of 60 degreeC / sec, and then performed die hardening. Table 3 shows the results of measuring the hardness (Vickers hardness, load 10 kg) after quenching. It can be seen that if the amount of C in the steel is low, the hardness after quenching will decrease, so the amount of C is preferably 0.10% by mass or more. It should be noted that, at this time, no sagging occurred in any of the test pieces.

[0158] [Table 3] Steel composition (mass%) of sample material

[0159]

Embodiment 3

[0161] According to the method same as embodiment 1, to the cold-rolled steel plate (thickness 1.6mm) that has the steel composition shown in table 1, with single side 80g / m 2 Aluminum plating is implemented. Then, to the ZnO microparticle suspension (nanotek slurry manufactured by CI Chemicals Co., Ltd.), a water-soluble acrylic resin was added in a weight ratio of 20% relative to ZnO, and the amount of Zn was 1 g / m 2 The resulting solution was applied in a target amount, and then dried at 80°C. This material was annealed at 630° C. for 7 hours under box annealing conditions until the surface was alloyed. The L* value at this time was 52.

[0162] Using this sample, the temperature was raised to 900° C. by the energization heating method, and the holding time was not elapsed, followed by rapid cooling in the mold. The average temperature increase rate at this time was 60°C / sec. The post-coating corrosion resistance of the material thus produced was evaluated in the same m...

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Abstract

An aluminum-plated steel sheet for hot pressing is provided which is free from the conventional problem that an aluminum-plated steel sheet, when applied to hot pressing, suffers aluminum melting during preheating for the hot pressing. The steel sheet is further free from the problem concerning delayed fracture caused by residual hydrogen. Also provided are: a process for producing the aluminum-plated steel sheet; and a method of hot pressing with rapid heating in which the aluminum-plated steel sheet is used. The aluminum-plated steel sheet for hot pressing is produced by annealing an aluminum-plated steel sheet in a coiled state in an annealing box furnace under holding-time and temperature conditions which are within the range shown in Fig 5, whereby the aluminum deposit is alloyed with the steel sheet. The method of hot pressing with rapid heating is characterized in that a blank cut out of the aluminum-plated steel sheet for hot pressing is preheated at a heating rate of 40 DEG C / sec or higher on the average so that the time period over which the blank is exposed to an environment of 700 DEG C or higher is 20 seconds or shorter, and the preheated blank is hot-pressed.

Description

technical field [0001] The present invention relates to an aluminized steel sheet for rapid heating and hot pressing, a method for producing the same, and a method for rapid heating and hot pressing using the same , and excellent productivity. Background technique [0002] In recent years, applications of steel sheets for automobiles (for example, automobile pillars, door impact beams, bumper beams, etc.) have been expected to have both high strength and high formability. As one of the steel sheets satisfying the demand, there is TRIP (Transformation Induced Plasticity) steel utilizing martensitic transformation of retained austenite. From the above-mentioned TRIP steel, a high-strength steel sheet having excellent formability and a strength on the order of 1000 MPa can be obtained, whereby the above-mentioned automobile parts can be manufactured. However, it is currently difficult to ensure formability when using ultra-high-strength steel with higher strength, for example...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/12C23C2/28C21D9/54C21D9/00C21D9/663C21D9/46C22C38/38C22C38/00
CPCC21D8/0278C21D8/0205C21D1/673C22C38/06C22C38/02C23C2/12C23C2/28C22C38/28C22C38/04C22C38/001C23C26/00C22C38/32C23C2/29C22C38/38C21D8/0473C21D8/0405C21D8/0457C23C2/0224
Inventor 真木纯阿部雅之楠见和久塚野保嗣
Owner NIPPON STEEL CORP
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