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Duplex and multiphase steels
1. Bumper DP1180
2. Front cross member DP780
3. Middle channel DP450
4. Side beam DP980/CP1000
5. B-pillar reinforcement DP600
Illustrate: Due to their special microstructure (high-hardness martensite and bainite phases dispersed in a softer ferrite matrix), duplex and multiphase steels combine strength and formability perfectly. These grades have high strain hardenability, good strain redistribution and formability. In addition, the mechanical properties of the finished part, such as yield strength, are far superior to those of the original sheet. The multi-phase steel has good roll formability, better bending performance and hole expansion performance than the dual-phase steel.
The yield strength of duplex and multiphase steels is further enhanced by a paint bake (also known as bake hardening, BH) process. In addition, the mechanical strength of the finished product gives these grades excellent fatigue strength and good energy absorption, making them suitable for use in structural parts and reinforcements.
Application: Thanks to their high energy absorption capacity and fatigue strength, cold-rolled dual-phase and multi-phase steels are particularly suitable for automotive structural and safety components such as longitudinal beams, cross members and various types of reinforcement.
| STANDARD | PrEN 10338:2013 | EN 10346:2015 |
| DP 450 | HCT450X | HCT450X +Z/ZF |
| DP 600 | HCT590X | HCT590X +Z/ZF |
| DP 780 | HCT780X | HCT780X +Z/ZF |
| DP 980 | HCT980XG | HCT980X +Z/ZF |
| *DP 1180 | HCT1180X | |
| CP 1000 | HCT980C | HCT980C +Z |
*DP1180 is available in uncoated material.
Mechanical properties: Guaranteed value of 20x80mm tensile specimen
>L-rolling direction
| GRADE | YS(MPa) | UTS(MPa) | E(%)L=80mm | n | BH2 | Direction |
| DP 450 | 280-340 | 450-530 | >= 27 | 0.16 | 30 | L |
| DP 600 | 330-410 | 600-700 | >= 21 | 0.14 | 30 | L |
| DP 780 | 450-550 | 780-900 | >= 15 | 0.1 | 30 | L |
| DP 980 | 700-850 | 980-1080 | >= 8 | 30 | L | |
| DP 1180 | 900-1100 | 1180-1380 | >= 5 | 30 | L | |
| CP 1000 | 780-950 | 980-1130 | >= 6 | 30 | L |
*The yield requirement of DP600/780/980 is different from the range in the table, and can be supplied by negotiation.
