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S81921 Stainless Steel vs. ASTM A356 Grade 2

Both S81921 stainless steel and ASTM A356 grade 2 are iron alloys. They have 73% of their average alloy composition in common. There are 30 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 S81921 stainless steel and the bottom bar is ASTM A356 grade 2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 260
150
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 29
25
Fatigue Strength, MPa 370
200
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 79
73
Tensile Strength: Ultimate (UTS), MPa 710
510
Tensile Strength: Yield (Proof), MPa 500
270

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 990
410
Melting Completion (Liquidus), °C 1430
1470
Melting Onset (Solidus), °C 1390
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
51
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 14
2.4
Density, g/cm3 7.7
7.9
Embodied Carbon, kg CO2/kg material 2.9
1.5
Embodied Energy, MJ/kg 41
20
Embodied Water, L/kg 150
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
110
Resilience: Unit (Modulus of Resilience), kJ/m3 630
190
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25
18
Strength to Weight: Bending, points 23
18
Thermal Diffusivity, mm2/s 4.0
14
Thermal Shock Resistance, points 20
15

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.25
Chromium (Cr), % 19 to 22
0
Iron (Fe), % 66.7 to 75.9
97.7 to 99.55
Manganese (Mn), % 2.0 to 4.0
0 to 0.7
Molybdenum (Mo), % 1.0 to 2.0
0.45 to 0.65
Nickel (Ni), % 2.0 to 4.0
0
Nitrogen (N), % 0.14 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030