Hard Faces

MECHANICAL SEAL HARD FACE MATERIALS

Hard Face Material Hardness Elastic Modulus E Tensile Strength Thermal Expansion Thermal Conductivity Density Temperature Limit Coeff.of Friction
Mohs GN/m2 MN/m2 µm/mK Watts/m°K mg/mm3 °C(a) vs. Carbon
Gray cast iron 5 100 200 10 45 7.2 200
Hastelloy “B” 6 230 1300 18 45 8.9 800
M-2 Tool steel 7 200 2000 11 25 8.2 500
Niresist 4 100 400 18 15 7.4 500
316 Stainless 4 200 600 16 16 8 600
440C Stainless 5 200 800 10 25 7.8 600
Stellite 7 220 1000 14 15 8.4 1000
T/C – Cobalt 8 600 1400 4 100 15 400 0.07
T/C – Nickle 8 600 600 5 90 15 250 0.07
Ceramic 85% 8 200 150 5 12 3.4 1400 0.07
Ceramic 99.5% 8 350 250 7 25 3.9 1700 0.07
SiC Alpha Sintered 9.7 400 250 4 130 3.1 1000 0.02
Sic Reaction Bonded 9.7 400 250 4 150 3.1 1000 0.02
(a) Severe oxidation in air, or significant loss of hardness, or changed microstructure.
Hard Face Material
Vickers N/mm2 Watts/m°C Gm/cc. °C(a)
Siliconized graphite
PE-8148 2000 16 50 1.95 232
Reaction Bonded
PR9242 2400 365 145 3.08 1372
Reaction Bonded
plus graphite PG9723 152 153 2.8 538
Alpha sintered
PS-10070 3000 400 130 3.1 1649
PS-10138 3000 407 130 3.1 1649

Posted

  • On February 09, 2018