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O-1, or oil hardening type 1, is a tool steel that has a place in many industries, including and particularly knife making.
NJSB O-1 is hot rolled with the option to run your pieces through the grinder to remove any decarb.
Easy to forge and grind, O-1 is a great steel for many applications among seasoned makers with the ability to accurately heat treat it. O-1 does require specific temperatures and soak times so it may not be an optimum choice for inexperienced novice makers with limited equipment.
As a deep hardening, high carbon tool steel, O-1 is hard to beat, literally.
From beasty competitions choppers to elegant high-speed kitchen cutlery, NJSB O-1 is the go-to tool steel for any major application you can consider.