High Strength Steel Sheets
for Automobile Suspension and Chassis Use
—High Strength Hot-Rolled Steel Sheets
with Excellent Press Formability and Durability
for Critical Safety Parts—
SHIMIZU Tetsuo FUNAKAWA Yoshimasa KANEKO Shinjiro
Abstract
JFE Steel has
developed two new high strength hot-rolled
steel sheets which provide excellent performance
in automobile suspension and chassis parts:
(1) “NANOHITEN,” a new precipitation-hardened
high strength hot-rolled steel sheet in which
precipitates are refined to a size of several
nanometers, giving the material an excellent
balance of elongation and the hole-expansion
ratio, and (2) “BHT steel sheet (bake-hardenable
steel with tensile strength increase),”
a new strain-aging type high strength hot-rolled
steel sheet which features low strength and
high formability during forming and a large
increase in tensile strength after paint baking,
resulting in a higher fatigue limit and improved
crashworthiness. This paper describes the
features and properties of these new products.
