ASTM A387 Grade 9 Class 1 vs. Annealed SAE-AISI H43

Both ASTM A387 grade 9 class 1 and annealed SAE-AISI H43 are iron alloys. Both are furnished in the annealed condition. They have a moderately high 90% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 9 class 1 and the bottom bar is annealed SAE-AISI H43.

ASTM A387 Grade 9 Class 1 Steel Annealed H43 Tool Steel

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness		150
Brinell Hardness		210

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

Poisson's Ratio		0.28
Poisson's Ratio		0.29

Shear Modulus, GPa		75
Shear Modulus, GPa		77

Tensile Strength: Ultimate (UTS), MPa		500
Tensile Strength: Ultimate (UTS), MPa		710

Thermal Properties

Latent Heat of Fusion, J/g		270
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		26
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		6.5
Base Metal Price, % relative		14

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

Embodied Carbon, kg CO₂/kg material		2.1
Embodied Carbon, kg CO₂/kg material		8.2

Embodied Energy, MJ/kg		28
Embodied Energy, MJ/kg		120

Embodied Water, L/kg		87
Embodied Water, L/kg		100

Common Calculations

PREN (Pitting Resistance)		12
PREN (Pitting Resistance)		31

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

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

Strength to Weight: Axial, points		18
Strength to Weight: Axial, points		25

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

Thermal Diffusivity, mm²/s		6.9
Thermal Diffusivity, mm²/s		8.3

Thermal Shock Resistance, points		14
Thermal Shock Resistance, points		21

Alloy Composition

Carbon (C), %		0 to 0.15
Carbon (C), %		0.5 to 0.65

Chromium (Cr), %		8.0 to 10
Chromium (Cr), %		3.8 to 4.5

Iron (Fe), %		87.1 to 90.8
Iron (Fe), %		83.2 to 85.9

Manganese (Mn), %		0.3 to 0.6
Manganese (Mn), %		0.15 to 0.4

Molybdenum (Mo), %		0.9 to 1.1
Molybdenum (Mo), %		7.8 to 8.5

Phosphorus (P), %		0 to 0.025
Phosphorus (P), %		0 to 0.030

Silicon (Si), %		0 to 1.0
Silicon (Si), %		0.2 to 0.45

Sulfur (S), %		0 to 0.025
Sulfur (S), %		0 to 0.030

Vanadium (V), %		0 to 0.040
Vanadium (V), %		1.8 to 2.2