TYPICAL ANALYSIS: 100MnCrW4(Germany) or SKS3(Japan)

BS4659 BO1 is a high quality non-distorting cold work tool steel.

Forging: Heat slowly and uniformly to 1000°C. Forge within a range of 1000/800°C reheating if necessary. Cool slowly (preferably in a furnace) to avoid setting up stresses.

Annealing: Heat uniformly to 770°C equalise, then furnace cool. Hardness after annealing will be approx. 229 brinell. Fully machined tools should be packed during annealing.

Stress Relieving: If machining operations have been heavy or if the tool has an unbalanced section, remove stresses before hardening by heating up to 650°C, equalise, then cool slowly.

Hardening: Heat uniformly to 780/820°C until heated through. (If possible pre-heat at 300/500°C) Allow 30 minutes per inch of ruling section and quench immediately in oil.

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

Tempering: Heat uniformly and thoroughly at the selected tempering temperatures and hold for at least one hour per inch of total thickness. For your guidance refer to our colour charts for forging, hardening and tempering.

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