ASTM A387 Grade 9 Class 1 vs. Annealed SAE-AISI T2

Both ASTM A387 grade 9 class 1 and annealed SAE-AISI T2 are iron alloys. Both are furnished in the annealed condition. They have 79% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (10, 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 T2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness		150
Brinell Hardness		230

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		79

Tensile Strength: Ultimate (UTS), MPa		500
Tensile Strength: Ultimate (UTS), MPa		780

Thermal Properties

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

Melting Completion (Liquidus), °C		1460
Melting Completion (Liquidus), °C		1820

Melting Onset (Solidus), °C		1410
Melting Onset (Solidus), °C		1760

Specific Heat Capacity, J/kg-K		470
Specific Heat Capacity, J/kg-K		410

Thermal Conductivity, W/m-K		26
Thermal Conductivity, W/m-K		19

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		46

Density, g/cm³		7.8
Density, g/cm³		9.3

Embodied Carbon, kg CO₂/kg material		2.1
Embodied Carbon, kg CO₂/kg material		11

Embodied Energy, MJ/kg		28
Embodied Energy, MJ/kg		170

Embodied Water, L/kg		87
Embodied Water, L/kg		98

Common Calculations

PREN (Pitting Resistance)		12
PREN (Pitting Resistance)		36

Stiffness to Weight: Axial, points		14
Stiffness to Weight: Axial, points		12

Stiffness to Weight: Bending, points		25
Stiffness to Weight: Bending, points		21

Strength to Weight: Axial, points		18
Strength to Weight: Axial, points		23

Strength to Weight: Bending, points		18
Strength to Weight: Bending, points		20

Thermal Diffusivity, mm²/s		6.9
Thermal Diffusivity, mm²/s		4.9

Thermal Shock Resistance, points		14
Thermal Shock Resistance, points		23

Alloy Composition

Carbon (C), %		0 to 0.15
Carbon (C), %		0.8 to 0.9

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

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

Iron (Fe), %		87.1 to 90.8
Iron (Fe), %		70.8 to 75.8

Manganese (Mn), %		0.3 to 0.6
Manganese (Mn), %		0.2 to 0.4

Molybdenum (Mo), %		0.9 to 1.1
Molybdenum (Mo), %		0 to 1.0

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

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

Silicon (Si), %		0 to 1.0
Silicon (Si), %		0.2 to 0.4

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

Tungsten (W), %		0
Tungsten (W), %		17.5 to 19

Vanadium (V), %		0 to 0.040
Vanadium (V), %		1.8 to 2.4