This International Standard defines the grades of abrasion-resistant white cast irons. It specifies the grades in terms of: — chemical composition; — hardness. The types of abrasion-resistant white cast irons covered by this International Standard are: a) unalloyed or low alloy cast irons; b) nickel-chromium cast irons covering two general types: 4 % Ni 2 % Cr cast irons; 9 % Cr 5 % Ni cast irons; c) high chromium cast irons covering five ranges of chromium content: Cr > 11 % to ≤ 14 %; Cr > 14 % to ≤ 18 %; Cr > 18 % to ≤ 23 %; Cr > 23 % to ≤ 30 %; Cr > 30 % to ≤ 40 %.