High strength thin steel sheet having excellent plating and elongation property and the method for manufacturing the same

A high-strength, thin steel plate technology, applied in the field of deep-drawn thin steel plates, can solve problems such as damage to the properties of plated steel plates, and achieve the effects of excellent plating properties, improved deep drawability, and excellent elongation properties

Active Publication Date: 2008-12-17
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because of the addition of Mn, Si, and B, manganese oxides and silicon oxides migrate to the surface of the steel sheet during annealing to cause serious damage to the characteristics of the plated steel sheet, making it difficult to make the plated product have an attractive surface

Method used

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  • High strength thin steel sheet having excellent plating and elongation property and the method for manufacturing the same
  • High strength thin steel sheet having excellent plating and elongation property and the method for manufacturing the same
  • High strength thin steel sheet having excellent plating and elongation property and the method for manufacturing the same

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Effect test

Embodiment approach

[0080] The present invention will now be described in more detail with reference to the following examples. These examples are provided only to illustrate the present invention and should not be construed as limiting the scope and spirit of the present invention.

Embodiment

[0082] Thick steel plates having the steel composition shown in Table 1 below were reheated at 1200°C, and at 910°C (higher than Ar 3 Transformation point) hot finish rolling. Then, the hot-rolled steel sheets were bent under the production conditions shown in Table 2 below, and then cold-rolled. At the continuous annealing temperature given in Table 2, the cold-rolled steel sheet was heated to the crack temperature at a rate of 10° C. / second and held at this temperature for 40 seconds.

[0083] For the inspection of mechanical properties, the annealed steel sheets obtained as above were treated as standard test specimens in accordance with the ASTM E-8 standard. The yield strength, tensile strength, elongation (property) and plastic anisotropy coefficient (r m value) and plane anisotropy coefficient (△r value).

[0084] In this paper, r is calculated by the following equation m value and △r value:

[0085] r m =(r 0 +2r 45 + r 90 ) / 4;

[0086] △r=(r 0 +2r 45 ten r...

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Abstract

Provided is a high-strength, thin steel sheet for deep-drawing which is largely used for automotive interior panels and has excellent plating and elongation properties, and a method for manufacturing the same. The thin steel sheet for deep-drawing having excellent plating and elongation properties comprises (i) less than 0.01 wt% of carbon, less than 0.3 wt% of silicon, 0.03-0.2 wt% of manganese, less than 0.15 wt% of phosphorus, 0.003-0.015 wt% of sulfur, 0.1-0.4 wt% of soluble aluminum (Sol.Al), less than 0.01 wt% of nitrogen, 0.003-0.01 wt% of titanium, 0.003-0.04 wt% of niobium, 0.0002-0.002 wt% of boron, less than 0.05 wt% of molybdenum, 0.005-0.2 wt% of copper, 0.05-0.5 wt% of chromium, 0.02-0.1 wt% of antimony, and the balance of Fe with inevitable impurities, and ii) more than 75% MnS, CuS and (Mn,Cu)S precipitates having a size of less than 20 nm. The present invention can provide a thin steel sheet for deep-drawing, having tensile strength of more than 440 MPa and excellent plating and elongation properties.

Description

field of invention [0001] The present invention relates to thin steel sheets widely used in automotive interior panels. More particularly, the present invention relates to a thin steel sheet for deep-drawing capable of securing a tensile strength greater than 440 MPa and having excellent plating and elongation characteristics, and to a manufacturing method thereof. Background technique [0002] Recently, applications and uses of high-strength steel sheets for deep drawing have rapidly increased, and these steel sheets are widely used as automotive interior panels because of their excellent formability. This is because since these high-strength, deep-drawn steel sheets have high strength and excellent elongation characteristics, they are less likely to show poor formability when processed, [0003] These excellent characteristics of deep-drawn steel sheets are closely related to the trend of demand for steel sheets with higher strength and better formability in order to be a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04
CPCC22C38/20C21D8/02C21D8/04C22C38/001C22C38/02C22C38/04C22C38/06C22C38/22C22C38/26C22C38/28C22C38/32
Inventor 韩箱浩
Owner 浦项股份有限公司
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