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Steel Sheet For Hot Stamping, Method For Manufacturing Same, And Hot Stamp Molded Article

A technology of hot stamping forming and manufacturing method, which is applied in the field of hot stamping steel plate and its manufacturing, and hot stamping forming body, and can solve the problems of adhesion in a heating furnace, lack of strength, and high strength of steel plate

Active Publication Date: 2017-12-01
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when considering the forming of a high-strength steel sheet of 780 MPa or more, there is a problem that even if the forming temperature is increased, the strength of the steel plate is still high and it is difficult to form, or there is a problem that the strength of the steel plate after forming by heating is reduced and obtained. When it is less than prescribed strength
However, since the zinc plating layer or the Al plating layer melts during heating and turns into a liquid phase, there is a problem that zinc or Al adheres to the inside of the heating furnace and the mold during conveyance or pressing of the steel sheet.
Adhered zinc or Al deposits cause indentation flaws in the hot stamped body, and there is a problem that it adheres to the formed body and deteriorates the appearance

Method used

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  • Steel Sheet For Hot Stamping, Method For Manufacturing Same, And Hot Stamp Molded Article
  • Steel Sheet For Hot Stamping, Method For Manufacturing Same, And Hot Stamp Molded Article
  • Steel Sheet For Hot Stamping, Method For Manufacturing Same, And Hot Stamp Molded Article

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Embodiment

[0220] Next, examples of the present invention will be described. The conditions in the examples are examples of conditions employed to confirm the practicability and effects of the present invention, and the present invention is not limited to the examples of conditions. The present invention can adopt various conditions as long as the object of the present invention can be achieved without departing from the gist of the present invention.

[0221] First, cast slabs with the composition of A~S, a~n shown in Table 1, cool to room temperature, and then heat for 220 minutes in a furnace with a furnace temperature of 1230°C. Hot rolling was performed at °C to 960°C, and coiling was performed under the temperature conditions shown in Table 2.

[0222]

[0223] Table 2

[0224]

[0225] *1: FH: cold-rolled state, HR: hot-rolled steel sheet, CR: cold-rolled steel sheet annealed after cold rolling.

[0226] *2: Means that C and Mn are too high, many cracks are generated durin...

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Abstract

A steel sheet for hot stamping contains, in percentage by weight, C: 0.100%-0.600%, Si: 0.50%-3.00%, Mn: 1.20%-4.00%, Ti: 0.005%-0.100%, B: 0.0005%-0.100%, P: 0.100% or less, S: 0.0001%-0.0100%, Al: 0.005%-1.000%, and N: 0.100% or less, with the remainder comprising Fe and impurities. The steel sheet surface roughness is such that Rz > 2.5 mum, and the surface is coated with 50 mg / m2 1,500 mg / m2 of oil coated thereon.

Description

technical field [0001] The present invention relates to a steel sheet for hot stamping excellent in scale adhesion during hot stamping, a method for producing the same, and a hot stamped formed body thereof. Background technique [0002] In order to cope with the trend of increasing combustion efficiency in recent years, the weight reduction of components such as door armrests and side members of automobiles has been studied. In terms of materials, from the viewpoint of ensuring strength and crash safety even with thinner walls, we are promoting high strength of the steel plate. Hereinafter, strength means both tensile strength and yield strength. However, since the formability of the material deteriorates as the strength increases, it is necessary to manufacture a steel plate that satisfies both formability and high strength in order to reduce the weight of the above-mentioned members. As a method of obtaining high formability with high strength, there is TRIP (TRansforma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/20B21D24/00C21D9/46C22C38/00C22C38/14C22C38/58C23F11/00C23G1/08
CPCB21D22/20B21D24/00C22C38/00C22C38/14C22C38/58C23F11/00C23G1/08C21D9/46C21D6/005C21D6/008C21D8/0205C21D8/0226C21D8/0236C21D8/0278C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C22C38/28C22C38/32C22C38/38B21B3/00B21B45/0242B21D22/022C22C38/004B21B1/04B21B1/463B21B2001/028
Inventor 东昌史诹访嘉宏近藤雄介佐藤浩一
Owner NIPPON STEEL CORP
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