01 Carbon Tool Steel, 4 x 50 x 500 mm
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01 Carbon Tool Steel 4 x 50 x 500 mm
O1 knife steel. Manufactured by Bohler-Uddeholm grade K460.
Oil hardening blade and tool steel, popular as a strong tough steel with better edge retention than for instance 1084 but requiring a more controlled heat treatment.
Buying 01 steel and heat treating it like a simple carbon steel like 1084 will be a waste of time and money.
Forging: 1050 C to 850 C, do not forge under 850 C to reduce chance of cracking.
Annealing if forging: from 710-750 C, not more than 20C/hour down to 600 C, then can be air cooled.
Stress relieving: 650 C to slow cool
Hardening: 780-820 C, hold time 15-30 mins, quench in oil for 63-65 HRC
Tempering: 2 x 2 hours at 200 C for 62-63 HRC, 250 C for 60 HRC and 290 C for 56-57 HRC