Abrasive Wear Test ASTM G65
Surfaces subjected to low stress abrasion show that material has been removed by hard, sharp particles or other hard, sharp surfaces plowing material out in the furrows. Grinding with a surface grinder can be a controlled form of low stress abrasion. The low stress qualifier means that the abradant is imposed on the surface with relatively low normal forces. The operating forces must be low enough to prevent crushing the abradant. Low stress abrasion rates are directly proportional to the sliding distance and the load on the particles or protuberances. The wear rate is significantly reduced by hard microconstituents within the surface microstructure (embedded carbides for example).
Low Stress Abrasion / Scratching Abrasion
The ASTM G65 (Dry Sand) test approximates low-stress sliding abrasion, the conditions that exist in a feed screw and barrel system conveying filled polymers.
The test allows comparison of wear resistant materials by their volume loss in cubic millimeters. Materials of higher wear resistance will have lower volume loss.
Extreme Coatings G-65 Test Data
Coating or Alloy |
Chemical Composition |
Application Process |
Average Hardness RC |
Volume Loss mm3 |
XC9000 |
88 Wc / 12 Co |
HVOF |
68-71 |
2.4 |
XC1000 |
88 Wc / 12 Co |
HVOF |
68-71 |
3.0 |
XC1000Ni |
90 Wc / 10 Ni |
HVOF |
68-71 |
3.0 |
XC1000-17 |
83 Wc / 17 Co |
HVOF |
67-70 |
4.7 |
XC4000 |
75 CrC / 25 NiCr |
HVOF |
62-64 |
3.2 |
Stellite 6 |
Co/Cr/W |
Weld overlay |
40 |
29.0 |
Stellite12 |
Co/Cr/W |
Weld overlay |
47 |
19.0 |
Stellite 1 |
Co/Cr/W |
Weld overlay |
54 |
12.0 |
Colmonoy 83 |
Ni/Cr/Boron/Wc |
Weld overlay |
48 |
10.0 |
Colmonoy 56 |
Ni/Cr/Boron |
Weld overlay |
49 |
15.0 |
D2 Steel (1.2379) |
Fe/Cr |
Wrought steel |
60 |
12.0 |
CPM-9V (HIP) |
Cr/V/Mo |
Powder Metallurgy |
54-56 |
9.5 |
Nitralloy (1.8550)* |
Fe/Al |
Wrought steel |
70 |
37* |
*Nitralloy estimated
Surface Engineering 
