WARREN, MI – General Motors develops a new heat-treatment process for its brake-system rotors that the auto maker expects will save customers’ money, reduce warranty costs and keep expensive wheels looking good. Called Ferretic Nitro-Carburizing, the patented process cooks rotors at 1,040° F (560° C) for a day, bonding nitrogen atoms to the steel rotors to strengthen and harden them. Since its introduction on a handful of models in 2008, the “rust-free ...

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