Invention Grant
- Patent Title: High-strength cold-rolled steel sheet excellent in workability and shape freezing property
- Patent Title (中): 高强度冷加工性能优良的冷轧钢板
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Application No.: US12718397Application Date: 2010-03-05
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Publication No.: US08349471B2Publication Date: 2013-01-08
- Inventor: Michitaka Tsunezawa , Yuichi Futamura , Masaaki Miura
- Applicant: Michitaka Tsunezawa , Yuichi Futamura , Masaaki Miura
- 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: JP2009-088088 20090331
- Main IPC: B32B15/04
- IPC: B32B15/04 ; B32B15/18 ; C22C38/00

Abstract:
A high-strength cold-rolled steel sheet with improved TS-EL balance, springback value, workability and shape freezing properties having: a steel content including 0.10-0.20 mass % C, 0.5-2.5 mass % Si, 0.5-2.25 mass % Mn, and 0.01-0.10 mass % Al; a structure comprising (A) a mother phase structure of ferrite and (B) a second phase structure of retained austenite optionally including martensite; and satisfying the following expressions (1) and (2): (Vf×Vγ×Cγ×dis)/dia≧300 (1), dis≧1.0 μm (2); where Vf (%) is the volume fraction of the ferrite, Vγ (%) is the volume fraction of the retained austenite, Cγ (mass %) is the carbon content in the retained austenite, dis (μm) is the shortest distance between the second phase structures, and dia (μm) is the average grain size of the second phase structures.
Public/Granted literature
- US20100247958A1 HIGH-STRENGTH COLD-ROLLED STEEL SHEET EXCELLENT IN WORKABILITY AND SHAPE FREEZING PROPERTY Public/Granted day:2010-09-30
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