vitesse
Active member
I think it's more likely that modern melting methods,the ability to keep the carbon content consistent & lower than in the past ,the demand for ventilated discs with their tighter wall thicknesses,coupled with modern moulding plant has led to the producers finding ways to cut cost out of their production methods supplying a harder disc but which can still be machined easily because of ceramic tipped cutting tools on automatic CNC lathes.The innoculation with Chrome would help with rust resistance & so its removal would have a negative effect in aggregation with lower carbon iron. -but normally Chrome is added to improve heat resistance as well as with Nickel to improve corrosion resistance-the more that's added the less machinabilityone gets.
