Generally we use grade 17 cast iron for our cast iron brake discs and S.G.Iron 420/12 for our ventilated cast iron discs.
Steel disc brakes can be supplied using any grade of steel required – we usually use EN8 stress-relieved steel, although with some applications, standard mild steel is adequate.
Generally, cast iron discs are preferred to steel discs, because the structure of iron has a deadness characteristic and will not ring or squeal. This noise reduction potential is especially needed in the converting industry, where constant machine noise can cause workplace problems.
If you use a large diameter narrow steel disc, it is likely to squeal unless the application is only used for holding pieces and is not continuously rotating.
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