Invention Grant
- Patent Title: Bake hardening steel with excellent surface properties and resistance to secondary work embrittlement, and preparation method thereof
- Patent Title (中): 具有优异的表面性能和耐二次加工脆化性的烘烤硬化钢及其制备方法
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Application No.: US13000655Application Date: 2009-06-09
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Publication No.: US09011615B2Publication Date: 2015-04-21
- Inventor: Seong-Ho Han , Il-Ryoung Sohn , Shin-Hwan Kang , Min-Ki Seun
- Applicant: Seong-Ho Han , Il-Ryoung Sohn , Shin-Hwan Kang , Min-Ki Seun
- Applicant Address: KR Pohang-si
- Assignee: POSCO
- Current Assignee: POSCO
- Current Assignee Address: KR Pohang-si
- Agency: The Webb Law Firm
- Priority: KR10-2008-0059281 20080623; KR10-2009-0049398 20090604
- International Application: PCT/KR2009/003093 WO 20090609
- International Announcement: WO2009/157661 WO 20091230
- Main IPC: C22C38/04
- IPC: C22C38/04 ; C21D8/02 ; C21D9/46 ; C22C38/00 ; C22C38/06 ; C22C38/12
Abstract:
Provided are a bake hardening steel having a crystalline grain size of ASTM No. 9 or more and a method for preparing the bake hardening steel by controlling the winding, rolling and cooling conditions. The bake hardening steel includes: C:0.0016˜0.0025%, Si:0.02% or less, P:0.01˜0.05%, S:0.01% or less, sol.Al:0.08˜0.12%, N:0.0025% or less, Ti:0.003% or less, Nb:0.003˜0.011%, Mo:0.01˜0.1%, B:0.0005˜0.0015% or less, balance Fe and other inevitable impurities, wherein % is weight %, and Mn and P satisfy the relation of −30(° C.)≧803P−24.4Mn−58.
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