I am thinking of developing a durable and less brittle hobby knife blade, x-acto.
What metals would be suitable for that? I would like a blade that is .5mm thick, I know it's quite thin, not a lot of material to work with.
So the aim would be to get a blade that is strong enough and won't snap.
Also, x-acto blades are quite affordable, others can be 50 times more expensive, so I would take price into consideration as well.
What are your suggestions for the blade metal?

Thank you so much

http://www.mr-hobby.com/en/itemDetail.php?iId=1859

The Japs already did it

If you gonna proceed with this, then try some high carbon steel (1095 or analogues like LAW 100 X by Carpenter). They will give the blade the hardness and strength needed to hold up against impact and wear.