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S43940 Stainless Steel vs. S31803 Stainless Steel

Both S43940 stainless steel and S31803 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 87% of their average alloy composition in common. There are 33 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 S43940 stainless steel and the bottom bar is S31803 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
260
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 21
29
Fatigue Strength, MPa 180
370
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 77
80
Shear Strength, MPa 310
460
Tensile Strength: Ultimate (UTS), MPa 490
710
Tensile Strength: Yield (Proof), MPa 280
500

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Corrosion, °C 540
430
Maximum Temperature: Mechanical, °C 890
1060
Melting Completion (Liquidus), °C 1440
1450
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
16
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 3.4
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 12
17
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.6
3.6
Embodied Energy, MJ/kg 38
49
Embodied Water, L/kg 120
160

Common Calculations

PREN (Pitting Resistance) 18
34
Resilience: Ultimate (Unit Rupture Work), MJ/m3 86
180
Resilience: Unit (Modulus of Resilience), kJ/m3 200
630
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
25
Strength to Weight: Bending, points 18
23
Thermal Diffusivity, mm2/s 6.8
4.3
Thermal Shock Resistance, points 18
20

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.030
Chromium (Cr), % 17.5 to 18.5
21 to 23
Iron (Fe), % 78.2 to 82.1
63.7 to 71.9
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 0
4.5 to 6.5
Niobium (Nb), % 0.3 to 0.6
0
Nitrogen (N), % 0
0.080 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.020
Titanium (Ti), % 0.1 to 0.6
0