New technologies, new regulations and new expectations require car manufacturers to think outside the box. As a result, a new generation of vehicles is demanding new material solutions to reduce weight, improve safety, cut emissions and lower costs.
To meet this demand, Aperam introduces MaX – the market’s only Advanced High Strength Stainless Steel for body in white and chassis applications.
MaX is available in three grades: MaX1.2HY, MaX1.6 and MaX HSHE (High Strength High Elongation). MaX1.2HY and MaX1.6 are currently being tested by our partners and customers, while MaX HSHE will be available for trials starting in 2019.
MaX1.6 and MaX1.2HY are ferritic stainless steels that, after thermal treatment, achieve a martensite phase, thus giving them an extremely high strength (until 1 600 MPa). Customers are already testing and qualifying this cost-effective material for reducing the weight of targeted parts.
As an ultra-high strength steel formed by hot stamping, MaX has the lightweight performance of aluminium and the cost-effectiveness of carbon steel. As a result, it offers such advantages as:
Front crash - ODB 40 %
Side crash - Oblique Pole
MaX redefines how to design a vehicle’s under body, resulting in a better crash performance and maintaining NVH versus baseline measurements.
MaX - Torsion Mode = 50 Hz
MaX - Static Torsion = 21.9 kNm/°
19 parts - 40.1kg
3 parts - 34.6kg
reduction in thickness
and the number of parts
price of parts manufactured
-25% welding spots
MaX’s simplified production process
can cut investment costs
From 6 parts to 1 using patch technology
6 parts - 10.7kg
1 parts - 9.7kg
Thanks to the enhanced crashworthiness of MaX, one can reduce the thickness of the dashboard and decrease intrusions into the safety cage during an ODB front crash. Due to its excellent formability, local reinforcements of the baseline are directly integrated into the dashboard panel as a patch. Thus, packaging constraints in the baseline are eliminated and the position of the patch is improved, resulting in an even further reduction in intrusions.
The dash panel is completed in two steps. The first step involves cold stamping, which assures the tunnel area. Next, the part is stamped in a hot stamping die with movable pads. This process becomes a hybrid of indirect and direct press hardening.
From 7 parts to 1 using TWB technology
7 parts - 17.8kg
1 parts - 15.4kg
Although not traditionally an energy absorbing part during a crash, using MaX in the front floor panel improves side pole crash performance while also reducing the overall thickness of the floor. With MaX, the entire floor panel is active during a crash: an increase in the stiffness of the tunnel means a more evenly distributed impact in the floor, resulting in lower intrusions on the side.
More and more manufacturers are using hot stamping parts. We propose the innovative concept of joining a low thickness part and a TWB. By taking advantage of reinforcement integration, one only has to produce one part.
From 6 parts to 1 using TWB technology
6 parts - 11.6kg
1 parts - 9.5kg
MaX’s excellent properties allow for the use of thin panels and the integration of all reinforcements into a single part. As a result, not only are rear crash requirements fully met, the overall weight is also reduced. Despite its slender size, the floor helps absorb energy during a crash, allowing the fuel tank to remain intact.
The part can be stamped in a die using multiple movable pads, to be drawn in a certain sequence. The market uses a single die on current hot stamping lines for this process.
Aperam developed MaX by working directly with car manufacturers, which allowed us to understand their challenges and create a solution that satisfies actual application needs.
To produce MaX, Aperam partners with a number of market-leading companies, including simulator, welding and component specialists.
Crash and NVH simulations,
Prototypes and feasibility
Feasibility and real industrial trials
Real industrial trials