04-23-2016, 10:03 PM
The type of steel has virtually no effect on a boring bar. They all have the same modulus of elasticity which determines their stiffness. Tungsten Carbide on the other hand is about 3 times stiffer. I have a few of those inserts and also made a boring bar to use them. They eat metal for breakfast.
Free advice is worth exactly what you payed for it.
Greg
Greg