4.8 kg of hardox in bar form.

The only way I see to get that is to ask at a firm that works Hardox that thick. A good guess is heavy mine applications, dredging and simular.

Unless you want to buy a full sheet of it. But that will get you a sheet of 6000*2500*30mm. = 3.6 tons (guesstimate, £20 000)

But I guess SSAB is a very userfriendly firm.