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AISI 321 Stainless Steel vs. Automotive Grey Cast Iron

Both AISI 321 stainless steel and automotive grey cast iron are iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is AISI 321 stainless steel and the bottom bar is automotive grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 210
160 to 280
Elastic (Young's, Tensile) Modulus, GPa 200
180
Elongation at Break, % 34 to 50
9.6 to 14
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
69 to 70
Tensile Strength: Ultimate (UTS), MPa 590 to 690
140 to 290
Tensile Strength: Yield (Proof), MPa 220 to 350
94 to 200

Thermal Properties

Latent Heat of Fusion, J/g 290
260 to 280
Melting Completion (Liquidus), °C 1430
1380 to 1390
Melting Onset (Solidus), °C 1400
1340 to 1350
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 16
41 to 43
Thermal Expansion, µm/m-K 17
12 to 14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
7.4 to 7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
8.8 to 9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 16
1.9 to 3.0
Density, g/cm3 7.8
7.5 to 7.6
Embodied Carbon, kg CO2/kg material 3.2
1.5 to 1.7
Embodied Energy, MJ/kg 45
21 to 24
Embodied Water, L/kg 140
44 to 51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190 to 230
18 to 25
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 310
25 to 110
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21 to 25
5.2 to 11
Strength to Weight: Bending, points 20 to 22
8.0 to 13
Thermal Diffusivity, mm2/s 4.1
11 to 12
Thermal Shock Resistance, points 13 to 15
4.2 to 8.6