Uncoated hot-forming steels for the production of press-hardened components
The excellent material and processing properties of phs-uncoated steels made by voestalpine make them an efficient and flexibly applicable solution for safety-relevant press-hardened components in lightweight automotive designs in which there are only small amounts of corrosion.
Tensile strengths above 1500 MPa
phs press-hardening steels are steels that have been further developed by voestalpine for press-hardened components. There are two manufacturing processes: In the indirect hot forming process, blanks are first formed into components at room temperature and cut to final geometry. The components are then heated to approximately 900 °C and hardened in a subsequent process step in the cooled tool. In the direct process, the blanks are formed at roughly 700 to 800 °C for uncoated steels and at approximately 500 to 600 °C for galvanized steels in order to obtain finalization of the geometry when the material hardens in the tool. Lower wall and/or component thicknesses can be achieved as a result of the high strength. In this manner, phs steels precisely meet the requirements of automotive lightweight design.
The phs‑uncoated 1500 steel grade made by voestalpine provides tensile strengths of 1350–1600 MPa in the hardened state. The tensile strength of the unhardened steel strip is approximately 550 MPa and achieves a high degree of freedom during cold forming in the indirect process.
The phs-uncoated 2000 steel grade with tensile strengths above 1800 MPa in hardened condition is an attractive option, particularly in lightweight components with slightly lower ductility requirements as compared to phs‑uncoated 1500.
Multiple use for crash-relevant components
In addition to their high tensile strength, phs-uncoated steels feature excellent crash behavior, good bending angles and very good joining properties. They are particularly suitable for use in automotive components in which high energy absorption is required with minimal deformation in the event of a crash, including passenger cabins and battery modules. phs-uncoated steels are also used in welded blanks, so-called tailor-welded blanks (TWB) or tailor-rolled blanks (TRB). Tailored-heating and tailored-cooling technologies can also be applied during press hardening.
Overview of benefits
- Best crash behavior
- Very good joining behavior
- Components also available as tailored-property parts (TPP)
|EN 10338 and EN 10346||VDA 239-100||Special voestalpine grade|