SAE-AISI 4118 Steel vs. SAE-AISI H43 Steel

Both SAE-AISI 4118 steel and SAE-AISI H43 steel are iron alloys. They have 86% of their average alloy composition in common. There are 21 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4118 steel and the bottom bar is SAE-AISI H43 steel.

SAE-AISI 4118 (G41180) Cr-Mo Steel SAE-AISI H43 (T20843) Molybdenum Hot-Work 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

Shear Modulus, GPa		73
Shear Modulus, GPa		77

Tensile Strength: Ultimate (UTS), MPa		500
Tensile Strength: Ultimate (UTS), MPa		710 to 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		1420
Melting Onset (Solidus), °C		1480

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

Thermal Conductivity, W/m-K		46
Thermal Conductivity, W/m-K		30

Thermal Expansion, µm/m-K		13
Thermal Expansion, µm/m-K		12

Otherwise Unclassified Properties

Base Metal Price, % relative		2.3
Base Metal Price, % relative		14

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

Embodied Carbon, kg CO₂/kg material		1.5
Embodied Carbon, kg CO₂/kg material		8.2

Embodied Energy, MJ/kg		20
Embodied Energy, MJ/kg		120

Embodied Water, L/kg		49
Embodied Water, L/kg		100

Common Calculations

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		18
Strength to Weight: Axial, points		25 to 75

Strength to Weight: Bending, points		18
Strength to Weight: Bending, points		22 to 46

Thermal Diffusivity, mm²/s		13
Thermal Diffusivity, mm²/s		8.3

Thermal Shock Resistance, points		15
Thermal Shock Resistance, points		21 to 62

Alloy Composition

Carbon (C), %		0.18 to 0.23
Carbon (C), %		0.5 to 0.65

Chromium (Cr), %		0.4 to 0.6
Chromium (Cr), %		3.8 to 4.5

Iron (Fe), %		97.5 to 98.4
Iron (Fe), %		83.2 to 85.9

Manganese (Mn), %		0.7 to 0.9
Manganese (Mn), %		0.15 to 0.4

Molybdenum (Mo), %		0.2 to 0.3
Molybdenum (Mo), %		7.8 to 8.5

Phosphorus (P), %		0 to 0.035
Phosphorus (P), %		0 to 0.030

Silicon (Si), %		0.15 to 0.35
Silicon (Si), %		0.2 to 0.45

Sulfur (S), %		0 to 0.040
Sulfur (S), %		0 to 0.030

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