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AISI 309H Stainless Steel vs. SAE-AISI 1144 Steel

Both AISI 309H stainless steel and SAE-AISI 1144 steel are iron alloys. They have 63% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is AISI 309H stainless steel and the bottom bar is SAE-AISI 1144 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
220 to 230
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 40
11 to 17
Fatigue Strength, MPa 200
280 to 430
Poisson's Ratio 0.27
0.29
Reduction in Area, % 51
34 to 40
Shear Modulus, GPa 78
72
Shear Strength, MPa 400
460 to 510
Tensile Strength: Ultimate (UTS), MPa 580
750 to 840
Tensile Strength: Yield (Proof), MPa 230
420 to 690

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 1080
400
Melting Completion (Liquidus), °C 1420
1450
Melting Onset (Solidus), °C 1370
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
51
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 19
1.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.6
1.4
Embodied Energy, MJ/kg 51
19
Embodied Water, L/kg 170
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
91 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 130
480 to 1290
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21
27 to 30
Strength to Weight: Bending, points 20
23 to 25
Thermal Diffusivity, mm2/s 4.0
14
Thermal Shock Resistance, points 13
22 to 24

Alloy Composition

Carbon (C), % 0.040 to 0.1
0.4 to 0.48
Chromium (Cr), % 22 to 24
0
Iron (Fe), % 58.1 to 66
97.5 to 98
Manganese (Mn), % 0 to 2.0
1.4 to 1.7
Nickel (Ni), % 12 to 15
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 0.75
0
Sulfur (S), % 0 to 0.030
0.24 to 0.33