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ASTM A302 Alloy Steel vs. AISI 308 Stainless Steel

Both ASTM A302 alloy steel and AISI 308 stainless 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 ASTM A302 alloy steel and the bottom bar is AISI 308 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 190
160
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 20 to 23
45
Fatigue Strength, MPa 250 to 280
210
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Shear Strength, MPa 370 to 390
410
Tensile Strength: Ultimate (UTS), MPa 590 to 620
590
Tensile Strength: Yield (Proof), MPa 350 to 390
230

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 410
990
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39 to 51
15
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2 to 7.4
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2 to 8.4
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4 to 3.0
17
Density, g/cm3 7.8 to 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.5 to 1.6
3.2
Embodied Energy, MJ/kg 20 to 21
46
Embodied Water, L/kg 48 to 50
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 120
210
Resilience: Unit (Modulus of Resilience), kJ/m3 330 to 410
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 22
21
Strength to Weight: Bending, points 20 to 21
20
Thermal Diffusivity, mm2/s 10 to 14
4.1
Thermal Shock Resistance, points 17 to 18
13