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The BDS process is not a coating, heat treatment or other form of mechanical, chemical or alloying bonding to the surface like plasma impingement. The process diffuses into the host material to form an inter-metallic structure which improves the resistance to impact, wear, corrosion and erosion as required by the specific application for:

  • Boiler Feedwater Startup
  • Boiler Feedwater
  • Regulator
  • Condensate Recirculation
  • Deaerator Level Control
  • Reheat Spray
  • Desuperheater
  • Turbine Bypass & Dump

Technical Data

  • Hardness: 1600-2500 KHN (KNOOP), dependent upon base material
  • Wear Resistance: Excellent against all hard surfaces
  • Corrosion Resistance: Excellent against HCL, H2SO4, HF, salt water and molten salts
  • Coefficient of Friction: Approximately 33% of base material
  • Gas Barrier: Excellent against oxygen, hydrogen and H2S
  • Surface Finish: The surface finish will remain unaltered and tolerance changed less than 0.001”
  • Penetration: Up to 0.040” depending on the base material, penetration is uniform and continuous
  • Masking: Surfaces not requiring the processes e.g. threads or welding ends, may be masked

Hardness Values

There are several methods of testing the hardness of metals. The method 
used is based upon the anticipated hardness, metallurgy, temperature and geometry of the component. To compare the results of one method over another is difficult, however the following table lists approximate comparisons of various materials. The hardness values for diffusion hardening is dependent upon the base metal.

Material Rockwell C Knoop
Alloy 20 10 180
304 St. St. 10 180
316 St. St. 14 190
Hastelloy B 14 190
Nickel 16 195
Hastelloy C 20 210
17-4 Nace 28-32 320
Monel 20-35 350
Alloy 25 30 320
CA6NM 30 320
Inconel 36 355
17-4 ph 30-41 400
Stellite 6 40-46 500
416 St. St. 45 500
440C St. St. 50-60 700
Stellite 12 47-51 600
Stellite 1 51-58 660
Colmonoy 6 56-61 700
Tungsten Carbide 70-75 1000-1200
Ceramics 70-75 1000-1200
Hard Chrome Plate 65-72 920-1100
Boron Diffusion 81+ 1500-2500