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Hardened SAE-AISI O6 vs. Hardened SAE-AISI P3

Both hardened SAE-AISI O6 and hardened SAE-AISI P3 are iron alloys. Both are furnished in the hardened (H) condition. They have a very high 97% of their average alloy composition in common.

For each property being compared, the top bar is hardened SAE-AISI O6 and the bottom bar is hardened SAE-AISI P3.

Hardened O6 Tool Steel Hardened P3 Tool Steel

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		180
Elastic (Young's, Tensile) Modulus, GPa		190

Poisson's Ratio		0.29
Poisson's Ratio		0.29

Rockwell C Hardness		64
Rockwell C Hardness		61

Shear Modulus, GPa		71
Shear Modulus, GPa		73

Tensile Strength: Ultimate (UTS), MPa		2070
Tensile Strength: Ultimate (UTS), MPa		1980

Thermal Properties

Latent Heat of Fusion, J/g		260
Latent Heat of Fusion, J/g		250

Melting Completion (Liquidus), °C		1430
Melting Completion (Liquidus), °C		1460

Melting Onset (Solidus), °C		1390
Melting Onset (Solidus), °C		1420

Specific Heat Capacity, J/kg-K		480
Specific Heat Capacity, J/kg-K		470

Thermal Conductivity, W/m-K		43
Thermal Conductivity, W/m-K		46

Thermal Expansion, µm/m-K		12
Thermal Expansion, µm/m-K		12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		7.4
Electrical Conductivity: Equal Volume, % IACS		7.3

Electrical Conductivity: Equal Weight (Specific), % IACS		8.6
Electrical Conductivity: Equal Weight (Specific), % IACS		8.3

Otherwise Unclassified Properties

Base Metal Price, % relative		2.3
Base Metal Price, % relative		2.8

Density, g/cm³		7.7
Density, g/cm³		7.9

Embodied Carbon, kg CO₂/kg material		1.5
Embodied Carbon, kg CO₂/kg material		1.5

Embodied Energy, MJ/kg		21
Embodied Energy, MJ/kg		20

Embodied Water, L/kg		47
Embodied Water, L/kg		50

Common Calculations

Stiffness to Weight: Axial, points		13
Stiffness to Weight: Axial, points		13

Stiffness to Weight: Bending, points		25
Stiffness to Weight: Bending, points		24

Strength to Weight: Axial, points		74
Strength to Weight: Axial, points		70

Strength to Weight: Bending, points		47
Strength to Weight: Bending, points		44

Thermal Diffusivity, mm²/s		12
Thermal Diffusivity, mm²/s		12

Thermal Shock Resistance, points		69
Thermal Shock Resistance, points		65

Alloy Composition

Carbon (C), %		1.3 to 1.6
Carbon (C), %		0 to 0.1

Chromium (Cr), %		0 to 0.3
Chromium (Cr), %		0.4 to 0.75

Copper (Cu), %		0 to 0.25
Copper (Cu), %		0 to 0.25

Iron (Fe), %		94.6 to 97.7
Iron (Fe), %		96.3 to 98.4

Manganese (Mn), %		0.3 to 1.1
Manganese (Mn), %		0.2 to 0.6

Molybdenum (Mo), %		0.2 to 0.3
Molybdenum (Mo), %		0

Nickel (Ni), %		0 to 0.3
Nickel (Ni), %		1.0 to 1.5

Phosphorus (P), %		0 to 0.030
Phosphorus (P), %		0 to 0.030

Silicon (Si), %		0.55 to 1.5
Silicon (Si), %		0 to 0.4

Sulfur (S), %		0 to 0.030
Sulfur (S), %		0 to 0.030