Tool steel

Tool steel refers to a variety of carbon and alloy steels that are particularly well-suited to be made into tools. Their suitability comes from their distinctive toughness, resistance to abrasion, their ability to hold a cutting edge, and/or their resistance to deformation at elevated temperatures (red-hardness).

With a carbon content between 0.7% and 1.4%, tool steels are manufactured under carefully controlled conditions to produce the required quality. The manganese content is often kept low to minimise the possibility of cracking during water quenching. However, proper heat treating of these steels is important for adequate performance, and there are many suppliers who provide tooling blanks intended for oil quenching.

Tool steels are made to a number of grades for different applications. Choice of grade depends on, among other things, whether a keen cutting edge is necessary, as in stamping dies, or whether the tool has to withstand impact loading and service conditions encountered with such hand tools as axes, pickaxes, and quarrying implements. In general, the edge temperature under expected use is an important determinant of both composition and required heat treatment. The higher carbon grades are typically used for such applications as stamping dies, metal cutting tools, etc..

Tool steels are also used for special applications like moulding (for plastics injection). This type of steel is weel-suited for this kind of use because the resistance to abrasion is an important criteria for a mould that will be used to produce 500,000 to 1,000,000 injected parts.

A typical composition is:

Carbon (C)	1.0%
Phosphorus (P)	0.04%
Manganese (Mn)	0.3%
Sulphur (S)	0.04%
Silicon (Si)	0.25%

See also

• High speed steel

External links

• Industeel page for tool/mould steel

References

Ferrous metallurgy sections in Machinery's Handbook, current edition