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Steel sheet and method for producing same

A steel plate and steel slab technology, applied in the field of steel plate preparation, can solve problems such as aging, lower steel quality, and surface defects

Inactive Publication Date: 2015-11-18
HYUNDAE STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, if the amount of solid solution carbon is large or if a low reduction ratio is applied or if proper temper rolling cannot be performed due to operating conditions, a certain elongation of the yield point will be maintained to cause surface defects, or rapid aging in a short period of time to reduce the quality of the steel

Method used

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  • Steel sheet and method for producing same
  • Steel sheet and method for producing same
  • Steel sheet and method for producing same

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Embodiment

[0083] Hereinafter, the structure and effects of the present invention will be described in further detail with reference to preferred embodiments. It should be understood, however, that these examples are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Those skilled in the art can easily conceive of matters not described herein, and thus a detailed description thereof is omitted.

[0084] 1. Preparation of steel plate samples

[0085] The steel slabs containing the components shown in Table 1 below and remaining iron and impurities were reheated at a temperature of 1200° C. for 2 hours, and then hot-rolled to obtain hot-rolled steel sheets. Hot rolling was performed at 870° C. (corresponding to a temperature equal to or higher than the Ar3 point) under finish rolling conditions. Each hot-rolled steel sheet was cooled and coiled at 700°C. Then, the coiled steel sheet was pickled and cold rolled at a reduction ratio of 60...

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Abstract

Disclosed are a steel sheet having excellent aging resistance and low yield ratio properties, and a method for producing same. The steel sheet according to the present invention is characterized by: consisting of, in wt%, C: 0.005-0.06%, Si: 0.2% or less, Mn: 1.0-2.0%, P: 0.08% or less, S: 0.01% or less, Al: 0.2-2.0%, at least one of Cr and Mo such that 0.3 <= [Cr]+0.3[Mo] <= 2.0, N: 0.008% or less, and Fe and inevitable impurities as the remainder; having a single phase structure of ferrite in a state of hot-rolled steel sheet; and having a dual phase structure of ferrite and martensite in a state of cold-rolled steel sheet.

Description

technical field [0001] The present invention relates to steel sheet manufacturing technology, and more particularly to a steel sheet having excellent aging resistance and low yield ratio properties without being subjected to temper rolling and a manufacturing method thereof. Background technique [0002] Exterior panels of motor vehicles need to have low yield ratio properties to ensure shape stability during the forming process. On the other hand, the formed outer panel of a motor vehicle needs to have impact resistance so that it is not easily deformed by external stress. [0003] Bake hardening steel is a steel that can satisfy both properties stated, in which solid solution carbon remains in the steel so that the yield strength of the final product can be increased by diffusion of carbon to dislocations during paint baking, so Guarantees the impact resistance of the final product. Normally, bake-hardened steel guarantees an increase in yield strength of 3kgf / mm 2 Or m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C22C38/00C21D9/46B21B3/00
CPCB21B3/00C21D1/84C21D6/002C21D6/005C21D6/008C21D8/02C21D8/0205C21D8/0226C21D8/0236C21D8/0263C21D8/0273C21D9/46C21D2211/005C21D2211/008C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/22C22C38/38C22C38/00
Inventor 姜春求朴振圣具南勋金成柱
Owner HYUNDAE STEEL CO LTD
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