1K0615301S For Audi disc brake disc rotor manufacturer

For Audi disc brake   Quality Standard---GG20     Material Requirements      1) Must meet Grade GG20 for gray iron castings.     2) Chemical Composition (Percent)          * Total Carbon:     3.0 - 3.50%        * Silicon:             1.90 - 2.30%        * Manganese:       0.60 - 0.90%        * Phosphorus:      0.12% Max.        * Sulfur:               0.10% Max.       3) Microstructure:          Graphite Structure-  Predominantly type A, size 3-5.           Matrix- Pearlitic with max. 15 ferrite. Free from chill       4) Physical Properties:          Tensile Strength-     Min. 200 N/mm        Brinell Hardness-     190 - 230  

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