sales@dspballs.in Steel Balls Stainless Steel Balls Carbide Balls Ceramics Balls Brass / Copper Balls Gauge Balls Modified Balls Burnishing Media Other Material Balls Other Precision Products                 DSP Precision Products Pvt. Ltd. Manufacturer & Exporter of Precision Balls & Allied Products Helpdesk || About Us || Contact Us || Career || Disclaimer       Si3N4 ZrO2 SiC Al2O3 STEELS Item Unit         Bearing Steel Stainless Steel Density g/cm3 3.2~3.3 6.00 3.1~3.2 3.95 7.85 7.90 Coefficient of linear expansion 10-6/K 3.20 10.50 4.50 8.50 10.0 11.0 Young's modulus Gpa 300~320 210 350 380 208 200 Poisson's ratio 0.26 0.30 0.20 0.22 0.30 0.30 HRC Hardness 1400~1600 1000~1200 ≥2500 1600~1800 700 ≤30-62 Bending sdreagth Mpa ≥800 950~1200 ≥350 300~500 2400   Fracture toughness MPam1/2 5.0~8.0 8.0~10.0 3.0~4.0 3.0~4.0 25   Thermal conductivity W/mk 35 2~3 150 30 30~40 15 Special electrical Resitance Ωmm2/m 1018 1015 1013 1018 0.1~1 0.75 Corrosion Resistance   good good good good poor poor Self-lubrication   good good good   poor poor Magnetism           magnetic magnetic Centrfngal force   little       high high Rolling Contact fatigue   spalling crush crush crush spalling