continued from part 1 - Controller General of Patents, Designs, and ...

(12) PATENT APPLICATION PUBLICATION (21) Application No.6481/DELNP/2008 A
(19) INDIA
(22) Date of filing of Application :24/07/2008 (43) Publication Date : 24/10/2008
(54) Title of the invention : "METHOD FOR MANUFACTURING HIGH STRENGTH STEEL STRIPS WITH SUPERIOR
FORMABILITY AND EXCELLENT COATBILITY"
(51) International classification :C12D 8/02 (71)Name of Applicant :
(31) Priority Document No :10-2005-0129515 1)POSCO
(32) Priority Date :26/12/2005
Address of Applicant :1 KOEDONG-DONG NAM-KU,
(33) Name of priority country :Republic of Korea POHANG, KYUNGSANGBOOK-DO 790-300, REPUBLIC OF
(86) International Application No :PCT/KR2006/005655 KOERA. Republic of Korea
Filing Date
:22/12/2006 (72)Name of Inventor :
(87) International Publication No :WO 2007/075008 1)KIM, SEONG-JU
(61) Patent of Addition to Application
Number
Filing Date
:NA
:NA
2)SOHN, IL-RYOUNG
3)HWANG, HYUN-GYU
4)LEE, SEUNG-BOK
(62) Divisional to Application Number :NA
Filing Date
:NA
(57) Abstract :
A method for manufacturing a steel sheet used for structural members, elements, etc. of au-tomobiles, such as a variety of members of
automobiles including a front side member, pillar, and the like, and more particularly, a method for manufacturing a steel sheet having
a high strength and formability as well as hot-dip galvanizing properties is disclosed. In the method, after an aluminum killed steel
slab, which comprises, by weight %, ; C: 0.05% to 0.25%; Si: 0.1% to 1.5%; S; 0.02% or less; N; 0.01% or less; Al; 0.02% to 2.0%;
Mn; 1.0% to 2.5%; P; 0.001% to 0.1%; Sb; 0.005% to 0.10%; the balance of Fe and other unavoidable impurities, is subjected to a
homogenization treatment at a temperature range of 10500C to 13000C, the aluminum killed steel slab is subjected to a hot rolling
under a finishing hot rolling temperature of 8500ºC to 9500ºC and a coiling temperature of 4000ºC to 7000ºC, followed by a cold
rolling under a cold rolling reduction ratio of 30% to 80%, and annealing the cold rolled steel sheet.
No. of Pages : 15 No. of Claims : 3
The Patent Office Journal 24/10/2008 25931