It is an excellent general purpose tool steel often used where the expense of high C high Cr tool steel won’t be justified.
Typical Analysis
Element Content%
Carbon 0.95
Manganese 1.25
Tungsten 0.50
Chromium 0.50
Vanadium 0.20
O1 tool steel is heated slowly and forging is done at 980-1000°C (not below 800°C). After forging,the component is cooled slowly in the furnace
O1 tool steel is supplied in the annealed condition and in the machineable condition. If forging or hardening of the component is done, then it has to be re-annealed. Annealed hardness will be about 229 Brinell.Annealing of O1 tool steel is done slowly and uniformly at 740-760°C. Then it is soaked well and cooled in the furnace at 500°C or below before the component is withdrawal.Hardness after annealing will be 229 Brinell.
O1 tool steel is heated slowly and if possible, it should be pre heated(especially when there are complex sections) at 300-500°C before it is raised to the hardening temperature of 780-820°C. Soaking needs to be done thoroughly allowing 30 minutes / 25mm of ruling section before the quenching process. Light sections must beoil quenched from the lower end of hardening temperature range. Tempering must be done after hardening.
This process is done to reduce internal strain,distortion and also cracking risk.The component is pre-heated to360°C and then the temperature is increased at 800°C for sectios 3mm thick or less/ or to 820°C for over 3mm thick sections. This procedure is an alternative procedure used when suitable salt bath equipments are available . Soaking is done according tothe sections and then quenching is done into molten salt, which is held at 210°C. Sufficient time to be given to thecentre of the piece in order to reach bath temperature, then it is withdrawed and cooled in the air. Tempering is to be done. Hardening in a neutral salt bath reduces the possibility of scaling /decarburisation. The component is heated to 830-850°C and after equalization, oil quenching is done.
It needs to be done in good condition using a suitable dressing tool.We recommend wet grinding. If dry grinding is done, then must use a very soft wheel for the same.
Tempering for O1 tool steel is done between 100°C and 350°C. Then the steel component is soaked well at the selected temperature for at least 1 hour / 25mm of total thickness.
With our material,we provide mill test certificate and ultrasonic ok certificate(Note: Provided only if mentioned before placing the order).
