ArcelorMittal Europe – Flat Products

Online client newsletter | September 2017

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Safely seated

S-in motion® study cuts seat weight by almost 20 percent

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ArcelorMittal’s S-in motion® solutions have helped carmakers achieve significant weight reductions on their vehicles with the most advanced high strength steels available today. Seats are the latest vehicle component to be examined as part of S-in motion®, and the weight saving potential is significant.

The S-in motion® Front Seats project identified where advanced high strength steels (AHSS) could be used to optimise and lightweight components while maintaining safety and performance. The scope of the study was a typical front seat for a C-segment passenger vehicle.

With commercially available seats weighing between 11.5 and 12.8 kilograms, the S-in motion® team first defined a baseline seat which weighed in at 12.4 kilograms. Their goal was to cut this to around 10 kilograms per seat using an optimised design and the latest AHSS.

Design optimisation to reduce weight

The use of AHSS was combined with part redesign to take maximum advantage of the advanced mechanical characteristics of the new steels. These parts included the backrest side-member, cushion side-member, gusset, and brackets. Some parts, such as the backrest side-member were redesigned by the S-in motion® team to reduce the number of parts. This reduced both weight and assembly time without affecting safety.

Significant weight reductions realised

Two S-in motion® Front Seats designs were developed as a part of the project. The first – known as the Ultimate design – reduced the weight of the seat from 12.4 to 10.1 kilograms, a saving of 2.3 kilograms (18.3 percent) per seat. With two front seats, the total saving could be 4.6 kilograms per vehicle.

The second solution – the Efficient design – reduced the weight of the seat to 10.4 kilograms, a saving of 2.0 kilograms (15.5 percent) per seat. However, this solution is achievable at a slightly lower cost to manufacturers. In high-volume production (over half a million seats per year), both S-in motion® Front Seats designs can reduce costs.

To find out more about S-in motion® Front Seats solutions:
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Steel frame structure of S-in motion® Front Seats

The S-in motion® Front Seats designs passed all crash validation tests.

Mouse over to discover the weight reduction per piece

Potential weight savings for each component of the Ultimate S-in motion® Front Seats

Material Breakdown

Baseline mass = 12.4 kg

Efficient Concept = 10.4 kg

Ultimate Concept = 10.1 kg

The Efficient and Ultimate S-in motion® Front Seats options both utilise much higher levels of AHSS than the baseline

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