The 20 cubic meter body was developed for installation in an 8x4 vehicle, mainly to haul the pyrochlore. The initial version weighed 7,426 kg (16,372 lbs.) and was made of conventional carbon steels, with a floor thickness of 8 mm (0.31") and 6 mm (0.24") for the sides of the body. A lightweighting initiative had already been underway when the company first specified 6 mm (0.24") thick Hardox® 450 for the floors and 4 mm (0.16") Hardox® 400 wear plate for the sides, front and rear doors.
“We now use Hardox® 500 Tuf steel and can reduce the body thicknesses even more: The bottom plate has gone from 6 mm (0.24") to 5 mm (0.20"), the sides and doors from 4 mm (0.16") to 3 mm (0.12"), and the vehicle weight down to 4,780 kg (10,538 lbs.). We also replaced medium-strength structural components like the chassis, made in steel with a yield strength of 300–700 MPa, with high-strength Strenx® 700 steel. This allowed us to eliminate the reinforcements and reduce the thickness of the superstructure,” says Hugo Rosa, maintenance manager at CBMM. The sheet thickness reduction was only possible by specifying Hardox® 500 Tuf, which has superior mechanical strength and impact properties compared with other steels in the 500 Brinell class previously on the market.