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Application of ultra-high-strength steel on the front bumper of the Peugeot 607
Published September 25, 2000 by ISATA - Dusseldorf Trade Fair in United Kingdom
Event: ISATA 2000
Crash resistance objectives lead PSA Peugeot Citroën to use ultra-high- strength steel for the front bumper of the new Peugeot 607.
The use of a specific high-strength steel with good quenching properties and a hot stamping process allows PSA Peugeot Citroën to lighten this bumper. Indeed, the weight reduction is more than 2 kg compared to a conventional high- strength steel solution.
After a complete austenization of the blank in a 900°C furnace for several minutes, the part is stamped then quenched for a few seconds in the same water- cooled tool to obtain a martensitic structure (yield strength over 950 MPa).
The benefit in crash resistance is high due to the increase in the elastic behavior for low-speed impacts and to the improved stiffness for 15 km/h urban crash.