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SAE-AISI H25 Steel vs. SAE-AISI P21 Steel

Both SAE-AISI H25 steel and SAE-AISI P21 steel are iron alloys. They have 81% of their average alloy composition in common. There are 21 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI H25 steel and the bottom bar is SAE-AISI P21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 79
73
Tensile Strength: Ultimate (UTS), MPa 710 to 1620
1130

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Melting Completion (Liquidus), °C 1750
1450
Melting Onset (Solidus), °C 1700
1410
Specific Heat Capacity, J/kg-K 420
470
Thermal Conductivity, W/m-K 26
41
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 38
6.5
Density, g/cm3 9.1
7.9
Embodied Carbon, kg CO2/kg material 6.2
2.3
Embodied Energy, MJ/kg 93
32
Embodied Water, L/kg 83
62

Common Calculations

Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 22 to 50
40
Strength to Weight: Bending, points 20 to 34
31
Thermal Diffusivity, mm2/s 6.7
11
Thermal Shock Resistance, points 22 to 49
37

Alloy Composition

Carbon (C), % 0.22 to 0.32
0.18 to 0.22
Chromium (Cr), % 3.8 to 4.5
0 to 0.5
Cobalt (Co), % 0
1.1 to 1.3
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 77.2 to 81.3
92.1 to 94.2
Manganese (Mn), % 0.15 to 0.4
0.35 to 0.72
Nickel (Ni), % 0 to 0.3
3.9 to 4.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.15 to 0.4
0.2 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 14 to 16
0
Vanadium (V), % 0.4 to 0.6
0.15 to 0.25