In the annealed condition, ULTIMET alloy is not very hard. However, it has a high work-hardening rate, and even stretching of sheets and flattening of plates during mill processing can increase its hardness. The hardnesses in this table were measured on mill sheets, and indicate how rapidly the alloy hardens upon cold working.

Condition Hardness, HRC
Mill Annealed 30
10% Cold-Work 40
20% Cold-Worked 43
40% Cold-Worked 49

HRC = Hardness Rockwell “C”.