Innovative bainitic steel grades for the most demanding chassis components

picture of a track control arm made of bainitic steel

General:

The innovative bainitic, hot-rolled strip steels SZBS600 and SZBS800 belong to the group of multi-phase steels and are characterized by a unique microstructure architecture which results in a very homogeneous hardness distribution. This means fewer starting points for crack propagation than in conventional multi-phase steels.

Highlights:

Illustration function enhancement

Function enhancement

Overview evolution of material requirements

Customer benefits:

very high hole expansion ratio up to 75 %
low edge crack sensitivity
good fatigue properties
high yield strength

Characteristics:

SZBS600:

Yield strength R_p0,2(in MPa): 480 -580
Tensile strength R_m (in MPa): 590 -670
Elongation A₈₀ (in %): ≥16¹

SZBS800:

Yield strength R_p0,2(in MPa): ≥680
Tensile strength R_m (in MPa): 800-980
Elongation A₈₀ (in %): ≥10¹

¹ to nominal thickness e ≥ 3mm applies A_5.

Diagram characteristics bainitic steel

Applications:

Chassis:

Axle crossmember

Photo transverse control arm

Transverse control arm

Photo trailing arm

Trailing arm

Photo toe link

Toe link

Photo spring control arm

Spring control arm