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
CN101326301AActive Publication Date: 2008-12-17浦项股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
浦项股份有限公司
Publication Date
2008-12-17

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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.
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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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