BS4659 BO1

UK Deliveries. Contact our well informed sales team. BS4659 BO1 is a high quality non-distorting cold work tool steel. With combined manganese chromium tungsten BS4659 BO1 tool steel is characterised by giving high surface hardness after tempering, good dimensional stability in hardening, and good machinability. 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 about 229 Brinell). Fully machined BS4659 BO1 should be packed during annealing. Stress Relieving: If machining BS4659 BO1operations 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 25 millimetre of ruling section and quench immediately in oil. Martempering: Martempering BS4659 BO1 is an alternative hardening procedure which may be used when suitable salt bath equipment is available. Tempering: Heat BS4659 BO1 uniformly and thoroughly at the selected tempering temperatures and hold for at least one hour per inch of total thickness. General purpose oil hardening tool steel which hardens at a relatively low temperature with minimum distortion.