With its property profile, the bainitic chassis steel CH-W® is particularly suitable for complex chassis components such as single-skin control arm, spring plates and similarly demanding parts.
Hot-rolled bainitic chassis steel
from _ to in mm
from _ to in mm
|CH-W® 660Y760T||HR660Y760T-CP||2.00 – 4.20||940 – 1,300|
|Yield strength||Tensile strength||Elongation||Hole expansion2|
|Steel grade||Rp0.2 [MPa]||Rm [MPa] min.||A [%] min.||A80 [%] min.||λ [%] min.|
|CH-W® 660Y760T||660 – 820||760||14||12||60|
Notes on applications and processing
Due to its selected chemical composition and the special rolling process, the bainitic chassis steel has a very fine microstructure. The desired properties of the steel are created by the specific microstructure with nanoprecipitations. The low Si content guarantees a flawless surface.
Microstructure of CH-W®
Hot-rolled bainitic chassis steel is often used in the vehicle chassis area. It offers high resistance to local necking thanks to favorable work hardening behavior. Due to its extremely fine and homogeneous microstructure, CH-W® steel also exhibit guaranteed hole expansion properties of at least 60% to ISO 16630. Furthermore bainitic chassis steel provides a favorable bending behavior, bending angles of well over 130° (to VDA 238-100) are typically possible.
Bainitic chassis steel is very suitable for welding both same-grade joints and hybrid joints with other common steel grades. The precondition is welding parameters matched to the material. Test results in accordance with SEP 1220-x are available and attest CH-W® good ability to join in any joining process. Of particular note are the excellent results of the typically even and fine-flaked MAG welding seams without cracking tendency or significant hardening. Consequently, the high demands placed on the fatigue strength of the seams are fulfilled.
The bainitic chassis steel CH-W® 660Y760T displays a comparably good fatigue strength like standard chassis grades.
Stress-strain curve of CH-W® 660Y760T compared to HR660Y760T-CP and S700MC