Invention Grant
- Patent Title: High strength hot rolled steel sheet excellent in bore expanding workability and method for production thereof
- Patent Title (中): 孔膨胀加工性优异的高强度热轧钢板及其制造方法
-
Application No.: US13210807Application Date: 2011-08-16
-
Publication No.: US08486205B2Publication Date: 2013-07-16
- Inventor: Motoo Satou , Tetsuo Soshiroda
- Applicant: Motoo Satou , Tetsuo Soshiroda
- Applicant Address: JP Kobe-shi
- Assignee: Kobe Steel, Ltd.
- Current Assignee: Kobe Steel, Ltd.
- Current Assignee Address: JP Kobe-shi
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2005-092610 20050328; JP2005-092611 20050328
- Main IPC: C22C38/44
- IPC: C22C38/44 ; C22C38/48 ; C22C38/50

Abstract:
A high-strength hot-rolled steel sheet containing C: 0.05 to 0.15%, Si: no more than 1.50% (excluding 0%), Mn: 0.5 to 2.5%, P: no more than 0.035% (excluding 0%), S: no more than 0.01% (including 0%), Al: 0.02 to 0.15%, and Ti: 0.05 to 0.2%, which is characterized in that its metallographic structure is composed of 60 to 95 vol % of bainite and solid solution-hardened or precipitation-hardened ferrite (or ferrite and martensite) and its fracture appearance transition temperature (vTrs) is no higher than 0° C. as obtained by impact tests (% in terms of % by weight).
Public/Granted literature
Information query