Typical Analysis: C 1.00, Mn .40, Si .20. O-1 Tool Steel is a general purpose oil-hardening tool and die steel. Normal care in treatment gives good results in hardening and produces small dimensional changes. It has good abrasion resistance, and sufficient toughness for normal tool and die applications. When compared to a 1 percent carbon steel, 0-1 has a machinability rating of 90. Preheat: 1200°F until thoroughly soaked. Harden at 1475°F. Hold 20 minutes per inch of greatest cross section after tool reaches furnace temperature (minimum holding time - 20 minutes). Quench in warm oil to 150° F. Temper immediately 2 hours per inch of greatest cross-section at temperatures shown to achieve the desired hardness.
