Brake disc (brake rotor

Auto Part - Brake Disc mechanical properties
1) Tensile strength: 210Mpa
2) Hardness: HB187 - 241
3) Statement of graphite: 90% of the graphite is lamella, with a remainder of no more than 10%, lamella graphite is mostly is type "A"
4) Length of graphite: According to ASTM A247 4 grade - 5 grade
5) Pearlite: More than 90% .