35CrMo2: good for outsourcing, but not good for polishing and engraving.
40CrMnMo7: materials processing slightly difficult but easy to hit the ball as well as carvings.
40NiCrMoV4: this is the type commonly used to make pieces or sheets completely hardened.
40Cr13: this type of corrosion resistant and good polishing, high hardness heat gain.
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