ASTM A681 O2 is an oil-quenched cold-work tool steel, part of the O series (oil-hardening steel) in the ASTM A681 standard. It is renowned for its high hardness, wear resistance, and good machinability, making it suitable for manufacturing precision tools.
Mechanical Properties:
Hardness: Achieves HRC 60-64 after oil quenching, depending on the heat treatment process.
Tensile Strength: High strength after heat treatment, suitable for high-load applications.
Toughness: Moderate toughness, superior to high-carbon steel but lower than some high-alloy tool steels.
Wear Resistance: High carbon and manganese content provide excellent wear resistance, ideal for cutting and stamping tools.
Machinability:
In the annealed state, it has good machinability, suitable for turning, milling, and grinding.
After hardening, machining becomes more difficult, requiring hard tools or grinding.
Corrosion Resistance:
Lacks special corrosion resistance; protective coatings or proper maintenance are needed in humid or corrosive environments.
Dimensional Stability:
Exhibits good dimensional stability after heat treatment, suitable for manufacturing precision tools.
