MakeItFrom.com
Menu (ESC)

ASTM A387 Grade 9 Steel vs. SAE-AISI 4340 Steel

Both ASTM A387 grade 9 steel and SAE-AISI 4340 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 4340 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
210 to 360
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20 to 21
12 to 22
Fatigue Strength, MPa 160 to 240
330 to 740
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
73
Shear Strength, MPa 310 to 380
430 to 770
Tensile Strength: Ultimate (UTS), MPa 500 to 600
690 to 1280
Tensile Strength: Yield (Proof), MPa 230 to 350
470 to 1150

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 600
430
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
44
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.0
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 10
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
3.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.1
1.7
Embodied Energy, MJ/kg 28
22
Embodied Water, L/kg 87
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 110
79 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 310
590 to 3490
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 18 to 21
24 to 45
Strength to Weight: Bending, points 18 to 20
22 to 33
Thermal Diffusivity, mm2/s 6.9
12
Thermal Shock Resistance, points 14 to 17
20 to 38

Alloy Composition

Carbon (C), % 0 to 0.15
0.38 to 0.43
Chromium (Cr), % 8.0 to 10
0.7 to 0.9
Iron (Fe), % 87.1 to 90.8
95.1 to 96.3
Manganese (Mn), % 0.3 to 0.6
0.6 to 0.8
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