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Glossary » Materials » Alloys » Steel » Tool Steel » AISI D4
AISI D4 is a High-Carbon, High-Chromium Cold Work Steel grade Tool Steel. It is composed of (in weight percentage) 2.05-2.40% Carbon (C), 0.60% Manganese (Mn), 0.60% Silicon (Si), 11.00-13.00% Chromium (Cr), 0.30% Nickel (Ni), 0.70-1.20% Molybdenum (Mo), 1.00% Vanadium (V), 0.25% Copper (Cu), 0.03% Phosphorus (P), 0.03% Sulfur (S), and the base metal Iron (Fe). Other designations of AISI D4 tool steel include UNS T30404 and AISI D4.
Steel is the common name for a large family of iron alloys. Steels can either be cast directly to shape, or into ingots which are reheated and hot worked into a wrought shape by forging, extrusion, rolling, or other processes. Wrought steels are the most common engineering material used, and come in a variety of forms with different finishes and properties. Tool steels typically have excess carbides (carbon alloys) which make them hard and wear-resistant. Most tool steels are used in a heat-treated state, generally hardened and tempered.

The typical elastic modulus of tool steels at room temperature (25°C) ranges from 190 to 210 GPa. The typical density of tool steels ranges from 7.72 to 8.0 g/cm3. The typical tensile strength varies between 640 and 2000 MPa. The wide range of ultimate tensile strength is largely due to different heat treatment conditions.