First off. There are different grades of steel with different levels of hardness.
• Titanium is not harder than steel. Titanium is about as hard as low grades of steel
• Titanium is relatively strong for its weight/density (which is why people want to make airplane parts out of it)
• Tungsten carbide and fancy steel alloys are the hardest metals in the world.
These super-hard metals would probably make for a poor snowboard edge because they have a poor modulus of elasticity. This means that if you stress the snowboard hard enough to flex it (and the edge), then these super-hard metals would be much more prone to breaking instead of bending. This also means that instead of the edges dulling gradually, little bits might very well break off.
If you were a gazillionaire, you could probably pay someone to make a snowboard with a modular diamond or granite edge. I'm not sure how well it would work in real life... but in theory if you staggered the edge with metal and then a super-hard material, you would be able to get more flex with the more durable edge. However, i'm not sure how much an edge tool capable of sharpening diamond would cost (or how long it would take to tune the board).
MORAL OF THE STORY: Spending 20 minutes tuning your edges every couple of days out probably isn't so bad in the long run
Last edited by Tarzanman; 12-28-2010 at 08:59 PM.