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SAE-AISI H12 Steel vs. S44725 Stainless Steel

Both SAE-AISI H12 steel and S44725 stainless steel are iron alloys. They have 78% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI H12 steel and the bottom bar is S44725 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 75
81
Tensile Strength: Ultimate (UTS), MPa 690 to 1850
500

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Melting Completion (Liquidus), °C 1480
1450
Melting Onset (Solidus), °C 1440
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 36
17
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.3
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 9.5
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
15
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 2.9
3.1
Embodied Energy, MJ/kg 41
44
Embodied Water, L/kg 76
170

Common Calculations

PREN (Pitting Resistance) 12
33
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 65
18
Strength to Weight: Bending, points 22 to 42
18
Thermal Diffusivity, mm2/s 9.8
4.6
Thermal Shock Resistance, points 22 to 60
16

Alloy Composition

Carbon (C), % 0.3 to 0.4
0 to 0.015
Chromium (Cr), % 4.8 to 5.5
25 to 28.5
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87.8 to 91.7
67.6 to 73.5
Manganese (Mn), % 0.2 to 0.5
0 to 0.4
Molybdenum (Mo), % 1.3 to 1.8
1.5 to 2.5
Nickel (Ni), % 0 to 0.3
0 to 0.3
Niobium (Nb), % 0
0 to 0.26
Nitrogen (N), % 0
0 to 0.018
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.8 to 1.2
0 to 0.040
Sulfur (S), % 0 to 0.030
0 to 0.020
Titanium (Ti), % 0
0 to 0.26
Tungsten (W), % 1.0 to 1.7
0
Vanadium (V), % 0 to 0.5
0