Brake drum for Audi  made of meterial G3000 cast iron as buyer OEM1. Must meet G3000 for gray iron castings2. 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,Website: , size 3-5.Matrix: Pearlite with max.15 ferrite. Free from chill4. Physical PropertiesTensile Strength: Min. 200 N/mmBrinell Hardness: 190 ~ 230HB