AISI O1

Typical analysis

C	Mn	Cr	W	V
0.90	1.00	0.50	0.50	0.15

An economical medium-alloy oil hardening steel. Safe and uniform hardening with good machinability, minimum size change. This steel has excellent ability to keep a keen cutting edge. It has high wear resistance with satisfactory toughness.

Typical applications

Machine taps, staybolt taps, thread chasers, milling cutters, reamers, precision shaping knives and woodworking tools, die plates and punches, high-production cutters for paper and similar thin materials, roller dies, cold work dies and roll forming applications.

Forging and Heat treating processing

Thermal Treatments	Degrees Celsius
Forging	1050°C - 850°C
Annealing	740°C - 760°C Tensile strength as Annealed ( 41 - 48 tons per Sq. inch ) Hardness: 191 - 219 BHN
Hardening	780°C - 820°C in Oil or hot bath ( 200°C - 230°C ) min. Soak 10 minutes
Tempering ( maximum wear )	150°C - 205°C
Tempering ( maximum toughness )	230°C - 315°C
Quenching medium	Oil
Obtainable hardness ( HRC )	63 - 66
Wear resistance	Medium
Toughness	Medium
Distortion in heat treating	Very low
Machinability	High
Red hardness	Low