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AISI 321H Stainless Steel vs. SAE-AISI A9 Steel

Both AISI 321H stainless steel and SAE-AISI A9 steel are iron alloys. They have 77% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is AISI 321H stainless steel and the bottom bar is SAE-AISI A9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
74
Tensile Strength: Ultimate (UTS), MPa 580
770 to 2030

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Melting Completion (Liquidus), °C 1430
1460
Melting Onset (Solidus), °C 1380
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
35
Thermal Expansion, µm/m-K 17
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
9.2

Otherwise Unclassified Properties

Base Metal Price, % relative 16
7.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.2
4.7
Embodied Energy, MJ/kg 46
70
Embodied Water, L/kg 140
82

Common Calculations

PREN (Pitting Resistance) 18
10
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21
28 to 73
Strength to Weight: Bending, points 20
24 to 46
Thermal Diffusivity, mm2/s 4.0
9.6
Thermal Shock Resistance, points 12
25 to 66

Alloy Composition

Carbon (C), % 0.040 to 0.1
0.45 to 0.55
Chromium (Cr), % 17 to 19
4.8 to 5.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 65.4 to 74
87 to 90.5
Manganese (Mn), % 0 to 2.0
0 to 0.5
Molybdenum (Mo), % 0
1.3 to 1.8
Nickel (Ni), % 9.0 to 12
1.3 to 1.8
Phosphorus (P), % 0 to 0.045
0 to 0.030
Silicon (Si), % 0 to 0.75
1.0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0 to 0.7
0
Vanadium (V), % 0
0.8 to 1.4