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High-strength hot-dip galvanized steel sheet and process for producing same

一种热浸镀锌钢板、制造方法的技术，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C浓度测定困难等问题，达到耐氢脆性及弯曲性优良、弯曲性优良、耐氢脆性优良的效果

Active Publication Date: 2012-05-30
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the method of Patent Document 12, it is difficult to measure the C concentration below the interface, especially at a depth within 1 μm.

Method used

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  • High-strength hot-dip galvanized steel sheet and process for producing same
  • High-strength hot-dip galvanized steel sheet and process for producing same
  • High-strength hot-dip galvanized steel sheet and process for producing same

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no. 1 Embodiment approach

[0057] Hereinafter, the first embodiment of the present invention will be described in detail.

[0058] First, the reason for limiting the composition of the steel sheet will be described. In addition, in this invention, unless otherwise specified, % means mass %.

[0059] (steel plate composition)

[0060] C is an essential element when it is intended to increase the strength of a steel sheet by strengthening the structure of martensite or retained austenite. The reason why the C content is specified as 0.05% or more is because: when C is less than 0.05%, it is difficult to use spray or jet water as a cooling medium to perform rapid cooling from the annealing temperature in a hot-dip galvanizing line, and it is easy to generate bleed. Carbon body or pearlite, it is difficult to ensure the necessary tensile strength. In order to achieve a high strength of 770 MPa or more more stably, it is more preferable to make the amount of C more than 0.08%, and it is more preferable to...

Embodiment 1

[0112] Hereinafter, the present embodiment will be specifically described by way of examples.

[0113] Continuous casting was carried out using a continuous casting facility equipped with an electromagnetic brake and a wire supply device for alloy addition in the casting mold to obtain steels with the compositions shown in Table 1. The electromagnetic force of the electromagnetic brake is set to 0.1 to 1.0T, and Fe wire is used as the wire. The amount of Fe filament to be added is adjusted according to its cross-sectional area and supply speed.

[0114]Next, the slab obtained by concentrating Fe on the surface portion produced in this way is hot-rolled at a heating temperature of 1080 to 1150°C, a finish rolling finish temperature of 910 to 930°C, and a coiling temperature of 580 to 690°C to reach Plate thickness 4.0mm. In addition, after pickling, it is cold-rolled to 2.0mm, and hot-dip galvanized with continuous hot-dip galvanizing equipment. The maximum reaching point te...

Embodiment 2

[0122] Steel with the composition shown in J in Table 1 was continuously cast using a continuous casting facility equipped with an electromagnetic brake and a wire supply device for alloy addition in the mold section. The electromagnetic force of the electromagnetic brake is set to 0.1 to 1.0T, and Fe wire is used as the wire. The amount of Fe filament added is adjusted according to its thickness and feeding speed.

[0123] Next, the slab obtained by concentrating Fe of various thicknesses in the surface layer produced in this way is subjected to heating temperature of 1080-1150°C, finishing temperature of 910-930°C, and coiling temperature of 580-690°C. Hot-rolled to a plate thickness of 4.0mm. In addition, after pickling, it is cold-rolled to 2.0mm, and hot-dip galvanized with continuous hot-dip galvanizing equipment. The maximum reaching point temperature of the continuous hot dip galvanizing equipment is 800°C, the average cooling rate from the maximum reaching point tem...

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Abstract

Disclosed is a hot-dip galvanized steel sheet which comprises a steel sheet part and a deposit formed on the surface of the steel sheet part and has a tensile strength of 770 MPa or higher, wherein the deposit is a zinc layer formed by hot-dip plating or an alloyed zinc layer formed by hot-dip plating, the steel sheet part comprises a soft layer, which is in direct contact with the deposit, and an inner layer, which is the part other than the soft layer, and the thickness (D) of the soft layer is 0.001 to 5% of the thickness (t) of the steel sheet part. In a cross-section along the thickness direction of the steel sheet part, when the hardness of the soft layer measured by a nanoindentation method is expressed by H1 and the representative hardness of the steel sheet part measured by the nanoindentation method is expressed by Ha, then H1 is 5-75% of Ha.

Description

technical field [0001] The invention relates to a high-strength alloyed hot-dip galvanized steel sheet and a manufacturing method thereof. [0002] This application is based on Japanese Patent Application No. 2009-200467 filed in Japan on August 31, 2009, Japanese Patent Application No. 2009-217578 filed in Japan on September 18, 2009, and Japanese Patent Application No. 2009 filed in Japan on September 18, 2009. -216986 and claims priority thereto, the contents of which are cited here. Background technique [0003] As a plated steel sheet having good corrosion resistance, there is an alloyed hot-dip galvanized steel sheet. This alloyed hot-dip galvanized steel sheet is usually produced by degreasing the steel sheet, preheating it in a non-oxidizing furnace or an oxidizing furnace, and performing reduction annealing in a reduction furnace to clean the surface and ensure the quality. It is dipped in a hot-dip galvanizing bath, and alloyed after controlling the amount of mol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/02B22D11/00B22D11/11B22D11/115C21D9/46C22C18/00C22C18/04C22C38/00C22C38/58C23C2/06C23C2/28
CPCC21D9/46C22C38/14C22C38/12C22C38/04C21D2211/004C21D1/76C23C2/06C22C18/04C23C2/26C22C38/06C22C38/02B32B15/013C21D1/74B22D11/115C22C38/001Y10T428/12799C23C2/261C23C2/024C23C2/0224C23C2/022C22C18/00C23C2/02
Inventor 森本康秀藤田展弘宫坂明博本田和彦东昌史铃木规之野中俊树
Owner NIPPON STEEL CORP
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