... do business with us. Quality control system:Every batches of material will be tested in density, HRA, TRS and magnetic saturation ... , B10, B12, B16, B20, B25, B32, B40, B50 Physical and mechanical properties of main grades: GradeISO gradeDensityHardnessTRS(g/cm3)(HRA)(Mpa)YG6K2014 ...