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S17400 Stainless Steel vs. SAE-AISI 81B45 Steel

Both S17400 stainless steel and SAE-AISI 81B45 steel are iron alloys. They have 76% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is S17400 stainless steel and the bottom bar is SAE-AISI 81B45 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280 to 440
160 to 200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 21
12 to 24
Fatigue Strength, MPa 380 to 670
250 to 350
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
73
Shear Strength, MPa 570 to 830
340 to 400
Tensile Strength: Ultimate (UTS), MPa 910 to 1390
540 to 670
Tensile Strength: Yield (Proof), MPa 580 to 1250
350 to 560

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 850
410
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 17
40
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 14
2.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.7
1.5
Embodied Energy, MJ/kg 39
20
Embodied Water, L/kg 130
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 160
77 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 880 to 4060
320 to 840
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 32 to 49
19 to 24
Strength to Weight: Bending, points 27 to 35
19 to 22
Thermal Diffusivity, mm2/s 4.5
11
Thermal Shock Resistance, points 30 to 46
17 to 21

Alloy Composition

Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 0 to 0.070
0.43 to 0.48
Chromium (Cr), % 15 to 17
0.35 to 0.55
Copper (Cu), % 3.0 to 5.0
0
Iron (Fe), % 70.4 to 78.9
97 to 98
Manganese (Mn), % 0 to 1.0
0.75 to 1.0
Molybdenum (Mo), % 0
0.080 to 0.15
Nickel (Ni), % 3.0 to 5.0
0.2 to 0.4
Niobium (Nb), % 0.15 to 0.45
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040