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Galvanized steel sheet and manufacturing method therefor

一种热浸镀锌钢板、热浸镀锌的技术，应用在热浸镀工艺、制造工具、化学仪器和方法等方向，能够解决Si和Mn氧化、基材钢板延展性低、热浸镀锌层剥离等问题

Active Publication Date: 2015-04-08
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, Si and Mn are easily oxidizable elements compared with Fe, so there is a problem that, although the treatment atmosphere is an Fe-reducing atmosphere due to the heating for recrystallization annealing in a full-radiant tube type heating furnace, Si and Mn contained in the base steel sheet will still be oxidized
Here, if the ductility of the base steel sheet is low, for example, even if the contact between the hot-dip galvanized layer and the base steel sheet is good, when the hot-dip galvanized steel sheet is processed (such as press forming), the base steel sheet itself or the Cracks also occur at the interface between the base steel plate and the hot-dip galvanized layer, and the hot-dip galvanized layer is easily peeled off from the base steel plate

Method used

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  • Galvanized steel sheet and manufacturing method therefor
  • Galvanized steel sheet and manufacturing method therefor
  • Galvanized steel sheet and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0215] Next, examples (examples and comparative examples) of the present invention will be specifically described.

[0216] Cold-rolled steel sheets with a thickness of 1 mm obtained by performing normal casting, hot rolling, pickling, and cold rolling were used as test materials 1 to 72 (see Table 1). For these test materials, annealing treatment and hot-dip galvanizing treatment are carried out in a continuous hot-dip galvanizing equipment equipped with a full-radiant tube heating furnace. Since the full radiant tube type heating furnace is used, not only is it less likely to cause roll sticking, but the productivity is also good. Corresponding phase transition point A in Table 1 c3 point temperature T Ac3 It calculated using the calculation formula of the transformation temperature provided by the website (http: / / www-it.jwes.or.jp / weld_simulator / cal1.jsp) of the Japan Welding Engineering Society Welding Technology Information Center.

[0217] Table 1

[0218] [Table 1] ...

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PUM

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Abstract

The present invention provides a galvanized steel sheet having excellent plating wettability and plating adhesion even when the base steel sheet contains Si and Mn, and provides a manufacturing method therefor. The galvanized steel sheet pertaining to the present invention includes a base steel plate containing Si, Mn, and other predetermined components, and a galvanized layer formed on at least one surface of the base steel plate. The base steel plate has an HA value and an HB that satisfy all of the following relational expressions, wherein HA is the average hardness of the surface layer that extends to a depth of 50 mum from the interface between the base steel plate and the galvanized layer, and HB is the average hardness of deep portions in excess of 50 mum from the interface. 50 <= HA <= 500 ... (1) 50 <= HB <= 500 ... (2) 0.5 <= HA / HB <= 0.9 ... (3)

Description

technical field [0001] The present invention relates to a hot-dip galvanized steel sheet and a method for producing the same. A hot-dip galvanized steel sheet that can be used as a member of a product in the field, and a manufacturing method thereof. Background technique [0002] As members of products in the automotive field, home appliance field, or building material field, surface-treated steel sheets to which rust resistance has been imparted are generally used. Among them, hot-dip galvanized steel sheets are widely used because they are not only excellent in rust resistance but also inexpensive. [0003] Generally, hot-dip galvanized steel sheets are manufactured by the following methods. [0004] First, a thin steel sheet obtained by subjecting a slab to hot rolling, cold rolling, and heat treatment is prepared as a base steel sheet (base material). Second, degreasing and / or pickling are carried out in the pretreatment process for the purpose of cleaning the surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C21D9/46C22C18/00C22C38/00C22C38/58C23C2/02C23C2/28
CPCC22C38/14C21D8/0278C23C2/02C23C2/28C23C2/06C21D8/0236C23C2/40C22C38/12C21D8/0226C22C38/04C22C18/00C22C38/06C21D9/46C22C38/02B32B15/013C22C38/58C22C38/00Y10T428/12799C21D6/001C21D6/002C21D6/005C21D6/008C21D8/021C21D8/0263C22C38/002C22C38/005C22C38/08C22C38/16C22C38/22C22C38/26C22C38/28C22C38/32C22C38/38C23C2/0222C23C2/024C23C2/0224C23C2/261C23C2/022
Inventor 藤田宗士山中晋太郎
Owner NIPPON STEEL CORP
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