O1 Tool Steel

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Applications

Typical applications for O1 tool steel include medium run dies, intricate press tools, drawing punches, broaches, bushings, lathe centres, chuck jaws, master cavity sinking hobs, paper cutting machine knives, plug gauges, thread gauges and precision measuring tools. Also commonly used in applications such as cams, cloth cutting knives, cold taps, reamers, collets, cutting hobs, strip slitting cutters, trimmer dies, tube expander rolls, plastic moulds and woodworking knives.

O1 Typical Analysis

Ground Flat Stock

Precision ground flat stock / gauge plate can be supplied in O1 tool steel. Stocks are available in a wide range of sizes. Metric sizes are supplied in 500mm and 1000mm lengths. Imperial sizes are supplied in 18″ and 36″ lengths. Subject to size suitability and availability non standard sizes and lengths can be produced in approximately 2 to 3 weeks.

Forging

Heat slowly and begin forging at 980-1000°C. Do not forge below 800°C. After forging O1 tool steel, cool slowly preferably in a furnace.

Annealing

O1 is supplied in the annealed and machinable condition. Re-annealing will only be necessary if the steel has been forged or hardened by the tool maker. To anneal, heat the O1 tool steel slowly to 740-760°C, soak well and allow to cool in the furnace to 500°C or below, before withdrawing. Annealed hardness will be about 229 Brinell.

Stress Relieving

When parts are heavily machined, ground or otherwise subject to cold work, stress relieving will be beneficial prior to hardening. Heat the O1 steel component carefully to 670-700°C, soak well and allow to cool in air.

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