Invention Grant
- Patent Title: High tensile steel for deep drawing and manufacturing method thereof and high-pressure container produced thereof
- Patent Title (中): 用于深冲压的高强度钢及其制造方法和由其制造的高压容器
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Application No.: US12741703Application Date: 2008-09-12
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Publication No.: US08652273B2Publication Date: 2014-02-18
- Inventor: Soon Taik Hong , Sung Ho Jang , Ki Hyun Bang
- Applicant: Soon Taik Hong , Sung Ho Jang , Ki Hyun Bang
- Applicant Address: KR
- Assignee: Posco
- Current Assignee: Posco
- Current Assignee Address: KR
- Agency: The Webb Law Firm
- Priority: KR10-2007-0113290 20071107
- International Application: PCT/KR2008/005432 WO 20080912
- International Announcement: WO2009/061073 WO 20090514
- Main IPC: C22C38/22
- IPC: C22C38/22 ; C22C38/28 ; C22C38/32 ; C22C38/50 ; C21D1/28 ; C21D1/32

Abstract:
There are provided a steel for deep drawing, and a method for manufacturing the steel and a high pressure container. The steel for deep drawing includes, by weight: C: 0.25 to 0.40%, Si: 0.15 to 0.40%, Mn: 0.4 to 1.0%, Al: 0.001 to 0.05%, Cr: 0.8 to 1.2%, Mo: 0.15 to 0.8%, Ni: 1.0% or less, P: 0.015% or less, S: 0.015% or less, Ca: 0.0005 to 0.002%, Ti: 0.005 to 0.025%, B: 0.0005 to 0.0020% and the balance of Fe and inevitable impurities, wherein a microstructure of the steel has a triphase structure of ferrite, bainite and martensite. The steel for deep drawing may be useful to further improve the strength without the deterioration of the toughness by adding a trace of Ti and B, compared to the conventional steels having a strength of approximately 1100 MPa. Also, the a method for manufacturing a steel may be useful to save the manufacturing cost and time by significantly curtailing time used in the spheroidization heat treatment during the deep drawing process, and to manufacture a steel for deep drawing that is used for a low-temperature, high-pressure container having a tensile strength of approximately 1200 Mpa by reducing a depth of the softening layer to prevent the deterioration in strength of the steel.
Public/Granted literature
- US20100236672A1 HIGH TENSILE STEEL FOR DEEP DRAWING AND MANUFACTURING METHOD THEREOF Public/Granted day:2010-09-23
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