High-tensile steel

[magicniner]

What sort of steel would you classify as High-tensile steel

Bolts marked 8.8 or higher probably con-rods and drive shafts in old style rigid rear axles with differentials

What sort of steel would you classify as High-tensile steel, and if you have any experience in machining High-tensile steel, what sort of problems does it give?

I've made the odd part from high tensile bolts, they can give a rough finish when turning but I just crank up the speed, use inserted tooling and avoid fine cuts. HSS might give a good finish at lower speeds but I tend to save HSS for jobs where I know I'll get plenty of work out of the tool before re-grinding,

- Nick