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High-strength hot-rolled plated steel sheet and method for manufacturing same

A hot-rolled steel sheet, high-strength technology, applied in the field of hot-rolled steel sheet, can solve problems such as material deterioration, and achieve the effect of ensuring strength and improving electroplatability

Active Publication Date: 2016-04-13
HYUNDAE STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of usual hot-rolled plated steel sheets, material deterioration may occur at the time of plating
Therefore, electroplating is only applicable to hot-rolled steel sheets with a tensile strength of 440MPa or less

Method used

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  • High-strength hot-rolled plated steel sheet and method for manufacturing same
  • High-strength hot-rolled plated steel sheet and method for manufacturing same
  • High-strength hot-rolled plated steel sheet and method for manufacturing same

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Embodiment approach

[0085] Hereinafter, the structure and operation of the present invention will be described in detail with reference to preferred embodiments. However, the embodiments are only examples and do not limit the scope of the present invention.

[0086] Since those not described herein are easily understood by those skilled in the art, descriptions thereof are omitted herein.

[0087] 1. Fabrication of samples of hot-rolled plated steel sheets

[0088] Steel ingots having the composition of Table 1 below were fabricated and then reheated at a temperature of 1250° C. for 120 minutes. Then, rough rolling is performed at a temperature of about 1000°C, and finish rolling is performed at a temperature of 850°C. Then, the steel ingot was cooled to 600°C at an average cooling rate of 150°C / sec, and maintained at 600°C for 30 seconds. Then, the steel ingot was naturally cooled to manufacture a sample of the hot-rolled steel sheet base material.

[0089] Then, the sample of the base mater...

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Abstract

Disclosed are a high-strength hot-rolled plated steel sheet capable of suppressing the occurrence of material deterioration at the time of plating while having high strength, and a method for manufacturing the same. The high-strength hot-rolled plated steel sheet according to the present invention comprises: a hot-rolled steel sheet base material composed of, in terms of wt%, 0.03-0.1% of C, no more than 0.06% of Si, 0.7-2.0% of Mn, no more than 0.02% of P, no more than 0.01% of S, 0.1-0.5% of at least one precipitate forming element, 0.3-1.0% of Al, 0.1-0.5% of Mo, and the residual water, and unavoidable impurities; and a plated layer formed on a surface of the hot-rolled steel sheet base material.

Description

technical field [0001] The present invention relates to a technique for manufacturing a hot-rolled steel sheet having an electroplated layer formed thereon, and more particularly to a high-strength hot-rolled electroplated steel sheet capable of suppressing The material deteriorates while having a high tensile strength of 780 Ma or more. Background technique [0002] In order to overcome the era of high oil prices, the automobile industry tried to reduce the weight of the car body. Therefore, much research has been conducted on the development of high-strength steels to reduce the weight of components. [0003] A typical example of an automotive component that requires high-strength steel might include the chassis. The material of the chassis requires high tensile strength for durability and high elongation and rimming properties for achieving complex component shapes. Snow removal using calcium chloride is frequently performed in winter. Therefore, the chassis may be co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C22C38/00C21D9/46B21B3/00
CPCC21D9/46C22C38/00C22C38/04C21D8/0226C21D8/0263C21D2211/004C21D2211/005C21D2251/02C22C38/06C22C38/12C22C38/14B21B1/22B21B2001/225
Inventor 高康熙都亨侠
Owner HYUNDAE STEEL CO LTD