SAE-AISI P21 Steel vs. S21460 Stainless Steel

Both SAE-AISI P21 steel and S21460 stainless steel are iron alloys. They have 66% of their average alloy composition in common. There are 19 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI P21 steel and the bottom bar is S21460 stainless steel.

SAE-AISI P21 (T51621) Low-Carbon Mould Steel UNS S21460 (XM-14) Stainless Steel

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		190
Elastic (Young's, Tensile) Modulus, GPa		200

Poisson's Ratio		0.29
Poisson's Ratio		0.28

Shear Modulus, GPa		73
Shear Modulus, GPa		77

Tensile Strength: Ultimate (UTS), MPa		1130
Tensile Strength: Ultimate (UTS), MPa		830

Thermal Properties

Latent Heat of Fusion, J/g		250
Latent Heat of Fusion, J/g		290

Melting Completion (Liquidus), °C		1450
Melting Completion (Liquidus), °C		1380

Melting Onset (Solidus), °C		1410
Melting Onset (Solidus), °C		1330

Specific Heat Capacity, J/kg-K		470
Specific Heat Capacity, J/kg-K		480

Thermal Expansion, µm/m-K		12
Thermal Expansion, µm/m-K		18

Otherwise Unclassified Properties

Base Metal Price, % relative		6.5
Base Metal Price, % relative		14

Density, g/cm³		7.9
Density, g/cm³		7.6

Embodied Carbon, kg CO₂/kg material		2.3
Embodied Carbon, kg CO₂/kg material		3.0

Embodied Energy, MJ/kg		32
Embodied Energy, MJ/kg		43

Embodied Water, L/kg		62
Embodied Water, L/kg		160

Common Calculations

Stiffness to Weight: Axial, points		13
Stiffness to Weight: Axial, points		14

Stiffness to Weight: Bending, points		24
Stiffness to Weight: Bending, points		25

Strength to Weight: Axial, points		40
Strength to Weight: Axial, points		30

Strength to Weight: Bending, points		31
Strength to Weight: Bending, points		26

Thermal Shock Resistance, points		37
Thermal Shock Resistance, points		17

Alloy Composition

Carbon (C), %		0.18 to 0.22
Carbon (C), %		0 to 0.12

Chromium (Cr), %		0 to 0.5
Chromium (Cr), %		17 to 19

Cobalt (Co), %		1.1 to 1.3
Cobalt (Co), %		0

Copper (Cu), %		0 to 0.25
Copper (Cu), %		0

Iron (Fe), %		92.1 to 94.2
Iron (Fe), %		57.3 to 63.7

Manganese (Mn), %		0.35 to 0.72
Manganese (Mn), %		14 to 16

Nickel (Ni), %		3.9 to 4.3
Nickel (Ni), %		5.0 to 6.0

Nitrogen (N), %		0
Nitrogen (N), %		0.35 to 0.5

Phosphorus (P), %		0 to 0.030
Phosphorus (P), %		0 to 0.060

Silicon (Si), %		0.2 to 0.4
Silicon (Si), %		0 to 1.0

Sulfur (S), %		0 to 0.030
Sulfur (S), %		0 to 0.030

Vanadium (V), %		0.15 to 0.25
Vanadium (V), %		0