A comparison of the wear resistances of Ni-hard 4 and high-chromium (15-3) cast irons has been made under different testing conditions. Several kinds of wear tester were employed (reciprocating grooving tester, dry sand rubber wheel tester, single-pass pendulum impact grooving tester, and blasting erosion tester). The results show that whereas Ni-bard 4 seems to be more suitable to resist blasting erosion, high-chromium cast iron is better at resisting grooving wear, the ranking of materials changing with testing conditions. The measured wear resistance of the irons has been explained in terms of microstructure and hardness. Material removal occurred as a result of different mechanisms. For grooving wear, a harder metal surface is preferable, under blasting erosion conditions, material removal is mainly determined by the matrix.
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