Need Hardox 500 20mm

[RogueTwoRobots]

Have you tried http://www.wearpartsuk.co.uk/ ?
Both Carbide and PP3D got their weapon bars/discs from them at 25mm thickness so I imagine they'd have 20mm, although maybe only in 450 grade.

[EventorizonIan]

Correction-got my suppliers mixed up; Metall Nord are good for cheap Aluminium (unless you have an Aalco account) bought my 7075 from them.
Titanium we've bought from TiTek
http://www.titek.co.uk/
Tel 0121 382 4121
Fax:0121 373 0489

Not the cheapest but they can get you what you want.