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ASTM A225 Steel vs. S21904 Stainless Steel

Both ASTM A225 steel and S21904 stainless steel are iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is ASTM A225 steel and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 250
210 to 300
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21 to 23
17 to 51
Fatigue Strength, MPa 330 to 390
380 to 550
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Shear Strength, MPa 390 to 520
510 to 620
Tensile Strength: Ultimate (UTS), MPa 620 to 830
700 to 1000
Tensile Strength: Yield (Proof), MPa 460 to 550
390 to 910

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 400
980
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1420
1350
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 52
14
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
15
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.8
3.0
Embodied Energy, MJ/kg 24 to 25
43
Embodied Water, L/kg 48
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 170
160 to 310
Resilience: Unit (Modulus of Resilience), kJ/m3 580 to 820
380 to 2070
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 22 to 29
25 to 36
Strength to Weight: Bending, points 21 to 25
23 to 29
Thermal Diffusivity, mm2/s 14
3.8
Thermal Shock Resistance, points 18 to 24
15 to 21

Comparable Variants