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Steel sheet having excellent uniform elongation and work hardening rate, and method for producing same

A technology of uniform elongation and work hardening, applied in chemical instruments and methods, manufacturing tools, improvement of process efficiency, etc., can solve the problems of dents in the furnace, poor weldability, etc. Effect

Active Publication Date: 2022-04-12
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology has problems in that the carbon content in the steel is as high as 0.2% or more, so the weldability is poor, and it causes dent defects in the furnace due to the large amount of Si contained

Method used

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  • Steel sheet having excellent uniform elongation and work hardening rate, and method for producing same
  • Steel sheet having excellent uniform elongation and work hardening rate, and method for producing same
  • Steel sheet having excellent uniform elongation and work hardening rate, and method for producing same

Examples

Experimental program
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Effect test

Embodiment Construction

[0165] After manufacturing a billet having an alloy composition shown in Table 1 below, the billet was heated to a temperature range of 1100-1300°C, and then hot finish rolling was performed at a temperature shown in Table 2 below to manufacture a hot-rolled steel sheet, The hot-rolled steel sheet was loaded into a coiling furnace and coiled, and then furnace-cooled to room temperature at a rate of 0.002°C / sec. At this time, the coiling temperature of each hot-rolled steel sheet is shown in Table 2 below.

[0166] Thereafter, each hot-rolled steel sheet was pickled, then cold-rolled at a cold-rolling reduction of 40-70%, thereby manufacturing a cold-rolled steel sheet, and then subjected to continuous annealing treatment under the conditions shown in Table 2 below, and then classified. Stage cooling (primary cooling and secondary cooling), and then keep at the secondary cooling termination temperature for more than 30 seconds. The holding time is no more than 200 seconds.

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PUM

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Abstract

The present invention relates to a steel sheet suitable for use in automotive structural members and the like, and more particularly, to a steel sheet having high strength and excellent uniform elongation and work hardening rate, and a method for manufacturing the same.

Description

technical field [0001] The present invention relates to a steel plate suitable for use in automobile structural parts and the like, and more particularly, to a steel plate having high strength and excellent uniform elongation and work hardening rate, and a method for producing the same. Background technique [0002] Environmental and safety regulations are becoming increasingly stringent in the automotive industry, and carbon dioxide (CO 2 ) emission control is gradually becoming stricter, and thus the control of fuel efficiency is also being strengthened. [0003] In addition, the Insurance Institute for Highway Safety has gradually strengthened collision safety regulations for passenger protection, and since 2013 has required harsh collision performance such as a 25% small overlap. [0004] The only solution that can solve such environmental and safety problems is to achieve lightweighting of automobiles. In order to reduce the weight of automobiles, high-strength steel ...

Claims

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Application Information

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IPC IPC(8): C22C38/60C22C38/38C22C38/18C22C38/06C22C38/04C22C38/02C21D8/02C21D1/26C23C2/06
CPCC22C38/38C21D9/46Y02P10/20C22C38/60C22C38/02C22C38/04C22C38/06C21D2211/008C21D2211/005C21D2211/002C21D8/0205C21D8/0226C21D8/0236C21D8/0263C21D8/0247C21D1/185C21D1/84C21D8/0242C21D1/19C22C38/001C21D8/0278C21D6/005C23C2/06C23C2/28C23C2/40C21D8/0273C23C2/29C21D8/02B32B15/013C21D6/002C21D6/008C22C38/002C22C38/26C22C38/28
Inventor 安衍相柳朱炫崔强铉
Owner POHANG IRON & STEEL CO LTD
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