SAE-AISI H43 Steel vs. SAE-AISI 4340M Steel

Both SAE-AISI H43 steel and SAE-AISI 4340M steel are iron alloys. They have 87% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI H43 steel and the bottom bar is SAE-AISI 4340M steel.

SAE-AISI H43 (T20843) Molybdenum Hot-Work Steel SAE-AISI 4340M (300M, K44220) Silicon-Vanadium Steel

Metric UnitsUS Customary Units

Mechanical Properties

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

Poisson's Ratio		0.29
Poisson's Ratio		0.29

Shear Modulus, GPa		77
Shear Modulus, GPa		72

Tensile Strength: Ultimate (UTS), MPa		710 to 2140
Tensile Strength: Ultimate (UTS), MPa		2340

Thermal Properties

Latent Heat of Fusion, J/g		270
Latent Heat of Fusion, J/g		280

Melting Completion (Liquidus), °C		1530
Melting Completion (Liquidus), °C		1440

Melting Onset (Solidus), °C		1480
Melting Onset (Solidus), °C		1400

Specific Heat Capacity, J/kg-K		460
Specific Heat Capacity, J/kg-K		480

Thermal Conductivity, W/m-K		30
Thermal Conductivity, W/m-K		38

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

Otherwise Unclassified Properties

Base Metal Price, % relative		14
Base Metal Price, % relative		3.9

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

Embodied Carbon, kg CO₂/kg material		8.2
Embodied Carbon, kg CO₂/kg material		1.9

Embodied Energy, MJ/kg		120
Embodied Energy, MJ/kg		26

Embodied Water, L/kg		100
Embodied Water, L/kg		55

Common Calculations

PREN (Pitting Resistance)		31
PREN (Pitting Resistance)		2.2

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

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

Strength to Weight: Axial, points		25 to 75
Strength to Weight: Axial, points		84

Strength to Weight: Bending, points		22 to 46
Strength to Weight: Bending, points		51

Thermal Diffusivity, mm²/s		8.3
Thermal Diffusivity, mm²/s		10

Thermal Shock Resistance, points		21 to 62
Thermal Shock Resistance, points		70

Alloy Composition

Carbon (C), %		0.5 to 0.65
Carbon (C), %		0.38 to 0.43

Chromium (Cr), %		3.8 to 4.5
Chromium (Cr), %		0.7 to 1.0

Iron (Fe), %		83.2 to 85.9
Iron (Fe), %		93.3 to 94.8

Manganese (Mn), %		0.15 to 0.4
Manganese (Mn), %		0.65 to 0.9

Molybdenum (Mo), %		7.8 to 8.5
Molybdenum (Mo), %		0.35 to 0.45

Nickel (Ni), %		0
Nickel (Ni), %		1.7 to 2.0

Phosphorus (P), %		0 to 0.030
Phosphorus (P), %		0 to 0.012

Silicon (Si), %		0.2 to 0.45
Silicon (Si), %		1.5 to 1.8

Sulfur (S), %		0 to 0.030
Sulfur (S), %		0 to 0.012

Vanadium (V), %		1.8 to 2.2
Vanadium (V), %		0.050 to 0.1