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For tool steel toughness, resistance to wear and corrosion, strength and resistance to distortion and warping during heat treatment are the most important properties of a tool steel. These properties are the condition under which it is manufactured. For purpose of comparison, the steels used to manufacture tablet press tooling have been grouped in three categories:
General-Purpose, Wear-Resistant and Corrosion-Resistant.

General-Purpose Steel categorizes of :
O.H.N.S. (OIL HARDENED NON SHRINKING STEEL ) i.e. O1 Steel which is commonly used for compression tool's manufacturing.

Wear-Resistant Steel categorizes of :
A2, D2 & D3 grades which are HIGH CARBON HIGH CHROMIUM STEEL used for their excellent wear resistance. Among all the steels commonly used for press tooling's D3 has the highest wear resistance which allows it to be used in dies manufacturing.

Corrosion-Resistant Steel Categorizes of :
S1, S7 & 408 Steels which provide protection against corrosive materials and also avoids problems with tip fractures. One measure of a tool steel's quality is the rate of impurities or voids called inclusions, which are present to some degree in all steels which is at its minimal in the above tool steels allowing it to develop less stress concentration after an undetermined load cycle.