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SAE-AISI P21 Steel vs. S46910 Stainless Steel

Both SAE-AISI P21 steel and S46910 stainless steel are iron alloys. They have 76% of their average alloy composition in common. There are 20 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI P21 steel and the bottom bar is S46910 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.28
Rockwell C Hardness 35
29 to 63
Shear Modulus, GPa 73
76
Tensile Strength: Ultimate (UTS), MPa 1130
680 to 2470

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
18
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 2.3
4.1
Embodied Energy, MJ/kg 32
55
Embodied Water, L/kg 62
140

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 40
24 to 86
Strength to Weight: Bending, points 31
22 to 51
Thermal Shock Resistance, points 37
23 to 84

Alloy Composition

Aluminum (Al), % 0
0.15 to 0.5
Carbon (C), % 0.18 to 0.22
0 to 0.030
Chromium (Cr), % 0 to 0.5
11 to 13
Cobalt (Co), % 1.1 to 1.3
0
Copper (Cu), % 0 to 0.25
1.5 to 3.5
Iron (Fe), % 92.1 to 94.2
65 to 76
Manganese (Mn), % 0.35 to 0.72
0 to 1.0
Molybdenum (Mo), % 0
3.0 to 5.0
Nickel (Ni), % 3.9 to 4.3
8.0 to 10
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.2 to 0.4
0 to 0.7
Sulfur (S), % 0 to 0.030
0 to 0.015
Titanium (Ti), % 0
0.5 to 1.2
Vanadium (V), % 0.15 to 0.25
0