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ASTM A203 Steel vs. SAE-AISI 4340 Steel

Both ASTM A203 steel and SAE-AISI 4340 steel are iron alloys.

For each property being compared, the top bar is ASTM A203 steel and the bottom bar is SAE-AISI 4340 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 180
210 to 360
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 22 to 26
12 to 22
Fatigue Strength, MPa 210 to 280
330 to 740
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 330 to 370
430 to 770
Tensile Strength: Ultimate (UTS), MPa 520 to 590
690 to 1280
Tensile Strength: Yield (Proof), MPa 290 to 390
470 to 1150

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
430
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 52
44
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4 to 7.6
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5 to 8.7
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 3.2 to 4.0
3.5
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.6 to 1.7
1.7
Embodied Energy, MJ/kg 21 to 23
22
Embodied Water, L/kg 50 to 52
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 120
79 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 230 to 410
590 to 3490
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
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 14
12
Thermal Shock Resistance, points 15 to 17
20 to 38