brake disc
The brake disc is made of China's gray cast iron 250 standard, referred to as HT250, equal to the American G3000 standard. The requirements for the three major elements of chemical composition are: C:3.1-3.4 Si:1.9-2.3 Mn:0.6-0.9. Mechanical properties: tensile strength >=206MPa, bending strength >=1000MPa, deflection >=5.1mm, hardness range from 187 to 241HBS.
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