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ASTM A387 Grade 9 Steel vs. SAE-AISI 4320 Steel

Both ASTM A387 grade 9 steel and SAE-AISI 4320 steel are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 9 steel and the bottom bar is SAE-AISI 4320 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
160 to 240
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20 to 21
21 to 29
Fatigue Strength, MPa 160 to 240
320
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
73
Shear Strength, MPa 310 to 380
370 to 500
Tensile Strength: Ultimate (UTS), MPa 500 to 600
570 to 790
Tensile Strength: Yield (Proof), MPa 230 to 350
430 to 460

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 600
420
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 26
46
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.0
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 10
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
3.4
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.1
1.7
Embodied Energy, MJ/kg 28
22
Embodied Water, L/kg 87
52

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 110
140 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 310
480 to 560
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 18 to 21
20 to 28
Strength to Weight: Bending, points 18 to 20
19 to 24
Thermal Diffusivity, mm2/s 6.9
13
Thermal Shock Resistance, points 14 to 17
19 to 27

Alloy Composition

Carbon (C), % 0 to 0.15
0.17 to 0.22
Chromium (Cr), % 8.0 to 10
0.4 to 0.6
Iron (Fe), % 87.1 to 90.8
95.8 to 97
Manganese (Mn), % 0.3 to 0.6
0.45 to 0.65
Molybdenum (Mo), % 0.9 to 1.1
0.2 to 0.3
Nickel (Ni), % 0
1.7 to 2.0
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.025
0 to 0.040
Vanadium (V), % 0 to 0.040
0

Comparable Variants