A2 Tool Steel

A2 is an air-hardening cold-work tool steel offering a good balance of wear resistance, toughness, and dimensional stability. Compared with D2, A2 has slightly lower wear resistance but better toughness and impact resistance, while its relatively low heat-treatment distortion makes it suitable for precision dies and tooling components.

Appearance & Properties

Color: Silver-gray to dark gray

Density: Approx. 7.86 g/cm³

Hardness: Typically approx. 57–62 HRC after heat treatment

Corrosion Resistance: Poor

Machinability: Good when annealed; difficult after hardening

Wear Resistance: Good

Toughness: Good

Weldability: Poor

Magnetism: Magnetic

Heat Treatment: Air hardening, annealing, tempering, etc.

Surface Treatments: Nitriding, PVD coating, black oxide, grinding, polishing, etc.

Typical Applications

A2 Tool Steel is widely used in die making, automotive manufacturing, stamping, metalworking, precision machinery, and industrial tooling.

Typical parts include stamping dies, punches, forming dies, shear tools, gauges, wear inserts, precision fixtures, and high-strength tooling components.

Advantages

• Good balance of wear resistance and toughness

• Better impact resistance than D2

• Air hardening with relatively low distortion

• Good dimensional stability

• Suitable for precision dies and tooling components

Limitations

• Generally lower wear resistance than D2

• Poor corrosion resistance

• Poor weldability

• Difficult to CNC machine after hardening