Hardened SAE-AISI A6 vs. Hardened SAE-AISI H43

Both hardened SAE-AISI A6 and hardened SAE-AISI H43 are iron alloys. Both are furnished in the hardened (H) condition. They have 88% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is hardened SAE-AISI A6 and the bottom bar is hardened SAE-AISI H43.

Hardened A6 Tool Steel Hardened H43 Tool Steel

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		190
Elastic (Young's, Tensile) Modulus, GPa		200

Poisson's Ratio		0.29
Poisson's Ratio		0.29

Rockwell C Hardness		62
Rockwell C Hardness		66

Shear Modulus, GPa		73
Shear Modulus, GPa		77

Tensile Strength: Ultimate (UTS), MPa		1990
Tensile Strength: Ultimate (UTS), MPa		2140

Thermal Properties

Latent Heat of Fusion, J/g		250
Latent Heat of Fusion, J/g		270

Melting Completion (Liquidus), °C		1460
Melting Completion (Liquidus), °C		1530

Melting Onset (Solidus), °C		1410
Melting Onset (Solidus), °C		1480

Specific Heat Capacity, J/kg-K		470
Specific Heat Capacity, J/kg-K		460

Thermal Conductivity, W/m-K		41
Thermal Conductivity, W/m-K		30

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

Otherwise Unclassified Properties

Base Metal Price, % relative		3.7
Base Metal Price, % relative		14

Density, g/cm³		7.8
Density, g/cm³		7.9

Embodied Carbon, kg CO₂/kg material		1.8
Embodied Carbon, kg CO₂/kg material		8.2

Embodied Energy, MJ/kg		24
Embodied Energy, MJ/kg		120

Embodied Water, L/kg		57
Embodied Water, L/kg		100

Common Calculations

PREN (Pitting Resistance)		4.8
PREN (Pitting Resistance)		31

Stiffness to Weight: Axial, points		13
Stiffness to Weight: Axial, points		14

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

Strength to Weight: Axial, points		71
Strength to Weight: Axial, points		75

Strength to Weight: Bending, points		45
Strength to Weight: Bending, points		46

Thermal Diffusivity, mm²/s		11
Thermal Diffusivity, mm²/s		8.3

Thermal Shock Resistance, points		65
Thermal Shock Resistance, points		62

Alloy Composition

Carbon (C), %		0.65 to 0.75
Carbon (C), %		0.5 to 0.65

Chromium (Cr), %		0.9 to 1.2
Chromium (Cr), %		3.8 to 4.5

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

Iron (Fe), %		93 to 95.8
Iron (Fe), %		83.2 to 85.9

Manganese (Mn), %		1.8 to 2.5
Manganese (Mn), %		0.15 to 0.4

Molybdenum (Mo), %		0.9 to 1.4
Molybdenum (Mo), %		7.8 to 8.5

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

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

Silicon (Si), %		0 to 0.5
Silicon (Si), %		0.2 to 0.45

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

Vanadium (V), %		0
Vanadium (V), %		1.8 to 2.2