| JFE Steel has
developed two types of formable high-carbon
steel sheets for automotive power train parts
which are suitable for one-piece forming.
The non-oriented high-carbon cold-rolled steel
sheet has extremely low planar anisotropy
of the r-value (Dr=0.06),
resulting in high formability, and excellent
hardenability in low-temperature, short-time
heat treatment. This new sheet displays high
dimensional accuracy in press forming of cylindrical
rotating parts. Hyper-burring high-carbon
hot-rolled steel sheet (Hyper-Burring SC)
has excellent burring properties (hole expansion,
punching) due to fine dispersion of spheroidized
cementites, which was made possible by applying
a rapid cooling system (Super-OLAC
H) in the run-out table of the hot-rolling
process, and is an optimum product for thickness-addition
forming. |
