ArcelorMittal Europe – Flat Products

Online client newsletter | September 2021

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Many into one

ArcelorMittal’s new MPI concept simplifies the vehicle production process

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Multi Part Integration (MPI) is a new concept from ArcelorMittal Tailored Blanks which is designed to incorporate many parts into one laser welded blank (LWB). MPI uses press hardenable steels (PHS), hot stamping LWB technology, and patches (when needed) to create the new part. For OEMs, MPI radically simplifies vehicle production by reducing the number of processes and the factory area required. The concept can be applied to all types of vehicles, including those with multiple powertrains. MPI results in significant gains – including a lighter finished vehicle and potential cost savings of up to 10 percent.

Part integration
Commonality & modularity
Crash management
CO2 emission reduction
Cost saving
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ArcelorMittal’s MPI concept offers advantages in many areas of vehicle production


To prove the practical viability of the MPI concept, teams from ArcelorMittal Tailored Blanks and ArcelorMittal Global R&D completed an MPI analysis of the rear H-frame of an S-in motion® SUV vehicle. The MPI H-frame concept replaces 11 separate parts with one. The solution can be applied to almost any powertrain simply by adding patches to reinforce local areas.

The MPI H-frame concept showed that 136 spot welds could be eliminated for every vehicle, and that the footprint of an OEMs bodyshop could be reduced by half. The weight of each vehicle is also reduced by 1.4 kilograms which means less CO2 emissions from reduced steel production and during the vehicle’s life. The combination of LWB technology and PHS such as Usibor® and Ductibor® has enhanced safety and ensured that the H-frame concept passed global crash test scenarios.

The MPI rear H-frame reduced the number of separate parts from 11 to just one LWB

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MPI door ring saves nearly 10 kg

ArcelorMittal engineers have also applied the MPI concept to a double door ring. The MPI concept combined a total of 13 parts on each side of the vehicle into just four per side. The number of spotwelds was cut by 122 per side, or 244 over the entire vehicle. Overall, the mass of the body-in-white is reduced by around 10 kilograms using the MPI design.

ArcelorMittal is now working on a new MPI concept for the floor panel. The results of this study are expected to be announced later in 2021. The H-frame, double door ring, and floor panel MPI applications have passed relevant IIHS and Euro NCAP tests.



When applied to a double door ring, the MPI concept reduced the number of parts from 13 to 4 per side

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ArcelorMittal believes that the MPI concept will offer a new dimension in vehicle evolution. Over the coming years, many more MPI applications will be identified and developed in cooperation with OEMs.



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