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Tool steel O1

(submitted by the website administration)

USA: AISI O1, UK: BO1, Sweden: 2140, Germany: 1.2510, Japan: SKS3
Chemical composition: C=0.95%, Mn=1.1%, W=0.5%, Si=0.3%, Cr=0.5%
Property Value in metric unit Value in US unit
Density 7.81 *10³ kg/m³ 487.8 lb/ft³
Modulus of elasticity 193 GPa 28000 ksi
Thermal expansion (20 ºC) 10.7*10-6 ºCˉ¹ 6.0*10-6 in/(in* ºF)
Specific heat capacity 461 J/(kg*K) 0.11 BTU/(lb*ºF)
Thermal conductivity 32 W/(m*K) 222 BTU*in/(hr*ft²*ºF)
Annealing temperature 740...760 ºC 1365...1400 ºF
Quenching temperature 790...830 ºC 1455...1530 ºF
Tempering temperature 100...300 ºC 210...570 ºF
Hardness (annealed) 91 RB 91 RB
Hardness (hardened) 65 RC 65 RC
Quenching medium Oil
Hardening depth Medium
Resistivity to distortion High
Resistivity to cracking High
Machinability High
Toughness High
Wear resistance Medium

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