Title:
GALVANNEALED STEEL SHEET WITH EXCELLENT WORKABILITY
Document Type and Number:
Japanese Patent JP2002309358
Kind Code:
A
Abstract:
To provide a new high-Si containing galvannealed steel sheet which has retained γ and which has excellent mechanical properties such as total elongation and improved slidability of a plated surface.
The galvannealed steel sheet has a galvannealing layer on a steel sheet, and this steel sheet contains ≥0.8 mass% Si and also contains ≥3% retained austenite by space factor. Further, with respect to Zn-Fe alloy crystal grains existing in the surface of the galvannealing layer, the length of the major axis of the crystal grains is two or less times that of the mirror axis and the number of the crystal grains of ≥4 μm mean grain size is controlled to ≤5 pieces/70 μm×50 μm.
Inventors:
YAMAMOTO TAKAYUKI (JP)
SHIMIZU MASAFUMI (JP)
HASHIMOTO SHUNICHI (JP)
SHIMIZU MASAFUMI (JP)
HASHIMOTO SHUNICHI (JP)
Application Number:
JP2001117381A
Publication Date:
October 23, 2002
Filing Date:
April 16, 2001
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
International Classes:
C23C2/06; C22C38/00; C22C38/02; C22C38/50; C23C2/28; (IPC1-7): C23C2/06; C22C38/00; C22C38/02; C22C38/50; C23C2/28
Attorney, Agent or Firm:
Etsushi Kotani (1 person outside)