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Steel Sheet for Formed Member Having Enhanced Ductility, Formed Member, and Method for Manufacturing the Formed Member

a technology of formed members and enhanced ductility, which is applied in the direction of metal layered products, metal coating processes, thin material processing, etc., can solve the problems of limited increase in the strength of steel sheets for automobiles, increased costs and abrasion of cold forming dies, and difficulty in adjusting the shape of steel sheets, etc., to achieve high strength and ductility

Inactive Publication Date: 2013-11-07
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention introduces a formed product with high strength and ductility that can be used to create automotive structural components, reinforcing parts, or heat-treatable impact-resistant components.

Problems solved by technology

However, high-strength steel sheets for automobiles may be difficult to form into desired shapes, and thus there is a limit on increasing the strength of steel sheets for automobiles.
However, large amounts of substances such as carbon (C) and manganese (Mn) have to be added to increase the strength of the steel sheet up to 1000 MPa grade, which increases costs and abrasion of cold forming dies and makes it difficult to correct the shape of the steel sheet.
However, steel sheets obtained by the techniques have low degrees of elongation at less than 10%, and thus cannot have sufficient resistance against impacts generating in automobiles.

Method used

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  • Steel Sheet for Formed Member Having Enhanced Ductility, Formed Member, and Method for Manufacturing the Formed Member
  • Steel Sheet for Formed Member Having Enhanced Ductility, Formed Member, and Method for Manufacturing the Formed Member
  • Steel Sheet for Formed Member Having Enhanced Ductility, Formed Member, and Method for Manufacturing the Formed Member

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example

[0063]Steel slabs having compositions as shown in table 1 and formed by vacuum melting were heated at 1000° C to 1300° C. for 1 hour in a heating furnace, and were hot-rolled to form hot-rolled steel sheets. The hot-rolled steel sheets were cooled at a predetermined temperature in a furnace. The hot rolling was finished at a temperature range of 850° C. to 950° C., and the cooling temperature at the furnace was 680° C. Thereafter, the hot-rolled steel sheets were pickled and cold-rolled at a reduction ratio of 50%. The cold-rolled steel sheets were annealed at 780° C. Thereafter, the cold-rolled steel sheets were finally continuously annealed at an overaging temperature of 400° C.

TABLE 1Chemical Composition (weight %)Nos.CSiMnPSAlNOthers*IS 10.111.63.030.00270.00530.0340.0033—IS 20.311.61.540.00230.00380.0320.0022—IS 30.311.63.030.00250.00430.0390.0153—IS 40.321.63.000.00290.00540.0320.0037—IS 50.311.72.980.00350.00450.5650.0027—IS 60.311.11.540.01600.00710.0130.0039—IS 70.311.72.97...

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Abstract

Provided is a steel sheet for a formed member having enhanced ductility, a formed member, and a method for manufacturing the formed member, and more particularly, to a steel sheet for making a formed member having high strength and ductility such as an automotive structural member and a reinforcing member, a formed member, and a method for manufacturing the formed member. The steel sheet for a formed member has enhanced ductility, and includes, by weight %, C: 0.1% to 1.0%, Si+Al: 0.4% to 3.0%, Mn: 0.1% to 5.0%, P: 0.0001% to 0.1%, S: 0.0001% to 0.03%, N: 0.03% or less (but not 0%), and the balance of Fe and inevitable impurities. The formed member having high strength and ductility that can be used for forming an automotive structural member, a reinforcing member, etc. In addition, the formed member can be used for a heat-treatable impact resistant member.

Description

TECHNICAL FIELD[0001]The present invention relates to a steel sheet for a formed member having enhanced ductility, a formed member, and a method for manufacturing the formed member, and more particularly, to a steel sheet for making a formed member having high strength and ductility such as an automotive structural member and a reinforcing member, a formed member, and a method for manufacturing the formed member.BACKGROUND ART[0002]As safety requirements and weight-reduction demands made on automobiles increase, research has been conducted into developing high strength and impact-resistant steel sheets as automotive body materials. However, high-strength steel sheets for automobiles may be difficult to form into desired shapes, and thus there is a limit on increasing the strength of steel sheets for automobiles.[0003]To address these problems, Korean Patent Application Publication No. 2007-0110914 discloses a steel sheet having enhanced formability and 800-MPa grade tensile strength...

Claims

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Application Information

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IPC IPC(8): C21D8/00C22C38/04C22C38/06C22C38/18C22C38/12C22C38/14C22C38/16C22C38/02C22C38/08
CPCC21D8/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18C21D1/18C21D1/673C21D8/0205C21D9/46C21D2211/001C21D2211/008C22C38/00C22C38/001C23C2/06C23C2/12B32B15/012B32B15/013C22C38/002C22C38/34C22C38/38C22C38/60Y10T428/12972Y10T428/12757Y10T428/12049Y10T428/12799Y10T428/31678
Inventor OH, JIN-KEUNKWAK, JAI-HYUNCHO, YEOL-RAEKIM, KI-SOO
Owner POHANG IRON & STEEL CO LTD
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