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ASTM A204 Steel vs. S21640 Stainless Steel

Both ASTM A204 steel and S21640 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 A204 steel and the bottom bar is S21640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 180
230
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 18 to 22
46
Fatigue Strength, MPa 200 to 220
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Shear Strength, MPa 330 to 360
520
Tensile Strength: Ultimate (UTS), MPa 520 to 590
740
Tensile Strength: Yield (Proof), MPa 290 to 330
350

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 410
940
Melting Completion (Liquidus), °C 1470
1430
Melting Onset (Solidus), °C 1420 to 1430
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 52
15
Thermal Expansion, µm/m-K 13
17

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
17
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 1.5
3.6
Embodied Energy, MJ/kg 20
51
Embodied Water, L/kg 47
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 90 to 95
280
Resilience: Unit (Modulus of Resilience), kJ/m3 220 to 290
300
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18 to 21
27
Strength to Weight: Bending, points 18 to 20
23
Thermal Diffusivity, mm2/s 14
4.0
Thermal Shock Resistance, points 15 to 17
16