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ASTM A204 Steel vs. AISI 420 Stainless Steel

Both ASTM A204 steel and AISI 420 stainless steel are iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ASTM A204 steel and the bottom bar is AISI 420 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 180
190
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 18 to 22
8.0 to 15
Fatigue Strength, MPa 200 to 220
220 to 670
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Shear Strength, MPa 330 to 360
420 to 1010
Tensile Strength: Ultimate (UTS), MPa 520 to 590
690 to 1720
Tensile Strength: Yield (Proof), MPa 290 to 330
380 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 410
620
Melting Completion (Liquidus), °C 1470
1510
Melting Onset (Solidus), °C 1420 to 1430
1450
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 52
27
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
3.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
3.5

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
7.5
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 1.5
2.0
Embodied Energy, MJ/kg 20
28
Embodied Water, L/kg 47
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 90 to 95
88 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 220 to 290
380 to 4410
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18 to 21
25 to 62
Strength to Weight: Bending, points 18 to 20
22 to 41
Thermal Diffusivity, mm2/s 14
7.3
Thermal Shock Resistance, points 15 to 17
25 to 62