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Dual-phase steels
Usage
Hot-rolled dual-phase steels are predominantly used in the manufacture of passenger car and commercial vehicle wheels (wheel discs). In order to reduce weight at the same time as increasing service life, maximum use is made of the typical properties of these materials, namely great forming and hardening potential at the same time as high strength and good weldability.
Salzgitter Flachstahl delivers steel grades DP550 and DP600 in accordance with the Stahl-Eisen-Werkstoffblatt’ (Iron and steel material sheet) 097-1.
Standards
| Grade | Material no. | D | FK1) |
|---|---|---|---|
| SEW 097 Teil 1 | |||
| DP550 | - | - | D |
| DP600 | 1.0936 | DD33X | D |
1) FK = Tensile strength class, see Chapter 5.1, Dimensions
Chemical composition in percent by weight [%] (Heat analysis)
| Grade | C | Si | Mn | P | S | N | Al | Cu + Cr1) + Ni |
|---|---|---|---|---|---|---|---|---|
| max. | max. | max. | max. | max. | max. | |||
| DP550 | 0,10 | 0,15 | 1,40 | 0,070 | 0,008 | 0,009 | 0,020 - 0,060 | 1,00 |
| DP600 | 0,10 | 0,15 | 1,40 | 0,070 | 0,008 | 0,009 | 0,020 - 0,060 | 1,00 |
1) Cr max. 0,80 %
Mechanical properties
| Grade | Yield point Rp0,2 |
Tensile strength [%] |
Min. total elognation [%] | Nominal thickness |
Rollable width |
|---|---|---|---|---|---|
| MPa | MPa | LO = 5,65 √SO | mm | mm | |
| DP550 | 300 - 400 | 530 - 620 | 24 | 3,00 - 6,00 | 1.130 - 1.500 |
| DP600 | 330 - 470 | 580 - 670 | 24 | 3,00 - 6,00 | 1.130 - 1.500 |
Unless otherwise agreed, tests are performed on longitudinal samples.
