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SAE-AISI 4340M Steel vs. ASTM A203 Steel

Both SAE-AISI 4340M steel and ASTM A203 steel are iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
160 to 180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.0
22 to 26
Fatigue Strength, MPa 690
210 to 280
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Shear Strength, MPa 1360
330 to 370
Tensile Strength: Ultimate (UTS), MPa 2340
520 to 590
Tensile Strength: Yield (Proof), MPa 1240
290 to 390

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 430
410
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 38
52
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
7.4 to 7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
8.5 to 8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
3.2 to 4.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.9
1.6 to 1.7
Embodied Energy, MJ/kg 26
21 to 23
Embodied Water, L/kg 55
50 to 52

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
110 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
230 to 410
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 84
18 to 21
Strength to Weight: Bending, points 51
18 to 20
Thermal Diffusivity, mm2/s 10
14
Thermal Shock Resistance, points 70
15 to 17