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S31277 Stainless Steel vs. SAE-AISI H21 Steel

Both S31277 stainless steel and SAE-AISI H21 steel are iron alloys. They have 45% of their average alloy composition in common. There are 20 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 S31277 stainless steel and the bottom bar is SAE-AISI H21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 80
76
Tensile Strength: Ultimate (UTS), MPa 860
720 to 1790

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Melting Completion (Liquidus), °C 1460
1630
Melting Onset (Solidus), °C 1410
1580
Specific Heat Capacity, J/kg-K 460
440
Thermal Expansion, µm/m-K 16
11

Otherwise Unclassified Properties

Base Metal Price, % relative 36
23
Density, g/cm3 8.1
8.5
Embodied Carbon, kg CO2/kg material 6.7
4.5
Embodied Energy, MJ/kg 90
68
Embodied Water, L/kg 220
72

Common Calculations

PREN (Pitting Resistance) 51
19
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 29
23 to 58
Strength to Weight: Bending, points 25
21 to 38
Thermal Shock Resistance, points 19
24 to 59

Alloy Composition

Carbon (C), % 0 to 0.020
0.28 to 0.36
Chromium (Cr), % 20.5 to 23
3.0 to 3.8
Copper (Cu), % 0.5 to 1.5
0 to 0.25
Iron (Fe), % 35.5 to 46.2
87.6 to 93.8
Manganese (Mn), % 0 to 3.0
0.15 to 0.4
Molybdenum (Mo), % 6.5 to 8.0
0
Nickel (Ni), % 26 to 28
0 to 0.3
Nitrogen (N), % 0.3 to 0.4
0
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0 to 0.5
0.15 to 0.5
Sulfur (S), % 0 to 0.010
0 to 0.030
Tungsten (W), % 0
8.5 to 10
Vanadium (V), % 0
0.3 to 0.6