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Your present location:Home >> Products >> Cold Work Tool Steel >> O2, 1.2842 >> O2/1.2842 knife steel, tool steel
  • Product Name: O2/1.2842 knife steel, tool st...
  • Product ID: 20171107
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AISI O2 is an Oil-Hardening Cold Work Steel grade Tool Steel. It is composed of (in weight percentage) 0.85-0.95% Carbon (C), 1.40-1.80% Manganese (Mn), 0.50% Silicon (Si), 0.35% Chromium (Cr), 0.30% Nickel (Ni), 0.30% Molybdenum (Mo), 0.30% Vanadium (V), 0.25% Copper (Cu), 0.03% Phosphorus (P), 0.03% Sulfur (S), and the base metal Iron (Fe). Other designations of AISI O2 tool steel include UNS T31502 and AISI O2.


Typical applications for O2 tool steel include medium run dies, press tools, drawing punches, broaches, bushings, lathe centres, chuck jaws, master cavity sinking hobs, plug gauges, thread gauges, thread cutting tools and precision measuring tools. It is also a popular tool steel for cams, cloth cutting knives, cold taps, reamers, collets, cutting hobs, strip slitting cutters, trimmer dies, tube expander rolls, plastic moulds and woodworking knives.


Heat uniformly to 1000°C. Forge within a range of 850-1050°C reheating if necessary. Cool slowly (preferably in a furnace) to avoid setting up stresses.


O2 tool steel is supplied in the annealed and machineable condition. Re-annealing will only be necessary if the steel has been forged or hardened. To anneal, heat uniformly to 720°C, equalise, then furnace cool (hardness about 229 Brinell). Fully machined tools in grade O2 should be packed during annealing.


Heat uniformly to 790-820°C until heated through. (If possible pre-heat at 300-500°C). Allow thirty minutes per 25 millimetre of ruling section and quench immediately in oil.


Martempering of O2 is an alternative hardening procedure which may be used when suitable salt bath equipment is available.

Heat Treatment

Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each O2 steel component. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Please consult your heat treatment provider for full guidance on heat treatment of tool steels.

Final Grinding

Select the correct grade of wheel in consultation with the grinding wheel manufacturer. Ensure the grinding wheel is in good condition by means of a suitable dressing tool. Wet grinding is a preferable option using a copious supply of coolant. If dry grinding is resorted to then use a very soft wheel.