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Special grade for hydroforming S320IHU
The mechanical properties of special grade S320IHU are between those of steel grades S275JRC and S355JRC according to EN 10025-2. They feature outstanding flow properties and particular suitability for high-frequency welding. This steel was specially developed for hydroforming and, due to its excellent forming properties, enables the production of high-strength components.
The steel is produced as hot-strip in nominal thicknesses of 2,0 to 7,0 mm in widths according to the Salzgitter Flachstahl delivery program.
S320IHU is melted in the oxygen-blowing process as fine-grained steel.
| Grade | C | Si | Mn | P | S | Altotal |
|---|---|---|---|---|---|---|
| max. | max. | max. | max. | max. | min. | |
| S320IHU | 0,18 | 0,20 | 1,25 | 0,020 | 0,010 | 0,015 |
| Grade | Upper yield strength ReH1) | Tensile strength Rm1) | Total elongation1) A80 |
|---|---|---|---|
| MPa | MPa | % | |
| S320IHU | 320 - 380 | 440 - 500 | ≥ 27 |
1) The given values apply to longitudinal samples.
Hydroforming
The hot strip is split into bands, which are then bent lengthways to form a tube and welded via high-frequency welding.
The tube is then split into sections and, if necessary, pre-bent. These workpieces are inserted into a mold consisting of two parts. The mold is closed and the ends of the tubes are sealed with two axial stamps. The stamps are hollow and have a borehole for filling the tube with an emulsion of water and oil; the necessary internal pressure is built up.
During forming, the two axial stamps press against the ends of the tubes with high force whilst, at the same time, the emulsion (with up to 4.000 bar) presses the wall of the tube against the tool mold. Hydroforming technology is used to produce highly accurate components with extremely precise repeat accuracy. By optimizing component design in accordance with the stresses applied and using strain-hardening, weight reductions are possible. The reduction in the number of parts, as well as the lack of welding seams, also offers cost and manufacturing benefits.
Parts produced by hydroforming are used as rear-axle crossmembers and transverse links, as base assemblies for vehicle bodies (pillars, sills, roof frames), as well as manifolds and headpipes in exhaust systems.
| unpickled | unpickled | pickled | pickled |
| mill edge | sheared | mill edge | sheared |
| unoiled or oiled | unoiled or oiled |
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