HIGH STRENGTH STEEL SHEET HAVING EXCELLENT RESISTANCE TO POST WELD HEAT TREATMENT AND METHOD FOR MANUFACTURING SAME

Title:

HIGH STRENGTH STEEL SHEET HAVING EXCELLENT RESISTANCE TO POST WELD HEAT TREATMENT AND METHOD FOR MANUFACTURING SAME

Document Type and Number:

WIPO Patent Application WO/2011/081350

Kind Code:

A2

Abstract:

The present invention relates to a steel sheet having excellent resistance to a post weld heat treatment (PWHT), in which the strength and toughness of the steel sheet are not degraded even when the PWHT is performed after a long-time rolling process. More particularly, the present invention relates to a steel sheet having excellent resistance to a PWHT and a method for manufacturing the same, wherein the steel sheet comprises, by weight%, C: 0.1 to 0.3%, Si: 0.15 to 0.50%, Mn: 0.6 to 1.2%, P: 0.035% or lower, S: 0.020% or lower, Al: 0.001 to 0.05%, Cr: 0.01 to 0.35%, Mo: 0.005 to 0.2%, V: 0.005 to 0.05%, Nb: 0.001 to 0.05%, Ti: 0.001 to 0.05%, Ca: 0.0005 to 0.005%, Ni: 0.05 to 0.5%, one or more selected from a group consisting of Cu: 0.005 to 0.5%, Co: 0.005 to 0.2% and W; 0.005 to 0.2%, and the balance Fe and unavoidable impurities.

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Inventors:

HONG SOON-TAIK
JANG SUNG-HO
RO YUN-JO
PARK JAE-HYUN

Application Number:

PCT/KR2010/009225

Publication Date:

July 07, 2011

Filing Date:

December 22, 2010

Export Citation:

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Assignee:

POSCO
HONG SOON-TAIK
JANG SUNG-HO
RO YUN-JO
PARK JAE-HYUN

International Classes:

C22C38/00; B21B1/22; B21B3/02; C21D8/02

Foreign References:

JPH09256037A

1997-09-30

Other References: