AISI O2

I understand, you're referring to AISI O2. My apologies for the confusion. AISI O2 is indeed a cold work tool steel, also known as oil-hardening tool steel. Here's a description of AISI O2:

• Composition: AISI O2 typically contains about 0.9% to 1.05% carbon, 1.0% to 1.4% manganese, 0.5% to 1.0% chromium, 0.1% to 0.3% silicon, and small amounts of phosphorus and sulfur. The exact composition may vary depending on the manufacturer, but these elements contribute to its properties.
• Hardness: AISI O2 can be hardened to relatively high levels, typically achieving a hardness of around 60-62 HRC (Rockwell hardness scale) after heat treatment. This high hardness provides excellent wear resistance, making it suitable for cutting, stamping, and forming applications.
• Wear Resistance: O2 exhibits good wear resistance, particularly in applications involving abrasive wear and moderate impact loads. It maintains its cutting edge well, contributing to extended tool life in demanding cold work environments.

• Toughness: While O2 possesses good toughness, it may not be as high as some other tool steels. However, it still offers sufficient toughness to resist chipping and fracturing during use, especially when properly heat treated.
• Cold Work Applications: AISI O2 is commonly used in various cold work applications such as blanking dies, forming dies, punches, knives, and cutting tools. Its combination of hardness, wear resistance, and toughness makes it suitable for a wide range of tooling requirements.
• Heat Treatment: O2 is typically hardened through oil quenching from austenitizing temperatures (around 790-840°C or 1450-1540°F). After quenching, tempering is often performed to improve toughness and reduce internal stresses.
• Machinability: AISI O2 has good machinability in the annealed condition. It can be machined into complex shapes and forms using conventional machining techniques such as milling, drilling, turning, and grinding.
• Dimensional Stability: O2 exhibits good dimensional stability during heat treatment, minimizing distortion and warping. This property is beneficial for producing precision components with tight tolerances.

In summary, AISI O2 is valued for its combination of hardness, wear resistance, and machinability, making it a suitable choice for various cold work tooling applications where moderate toughness is acceptable.