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S43940 Stainless Steel vs. S31100 Stainless Steel

Both S43940 stainless steel and S31100 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 85% of their average alloy composition in common. There are 33 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is S43940 stainless steel and the bottom bar is S31100 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
270
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 21
4.5
Fatigue Strength, MPa 180
330
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 77
79
Shear Strength, MPa 310
580
Tensile Strength: Ultimate (UTS), MPa 490
1000
Tensile Strength: Yield (Proof), MPa 280
710

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Corrosion, °C 540
470
Maximum Temperature: Mechanical, °C 890
1100
Melting Completion (Liquidus), °C 1440
1420
Melting Onset (Solidus), °C 1400
1380
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
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.4
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 12
16
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.6
3.1
Embodied Energy, MJ/kg 38
44
Embodied Water, L/kg 120
170

Common Calculations

PREN (Pitting Resistance) 18
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 86
40
Resilience: Unit (Modulus of Resilience), kJ/m3 200
1240
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
36
Strength to Weight: Bending, points 18
29
Thermal Diffusivity, mm2/s 6.8
4.2
Thermal Shock Resistance, points 18
28

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.060
Chromium (Cr), % 17.5 to 18.5
25 to 27
Iron (Fe), % 78.2 to 82.1
63.6 to 69
Manganese (Mn), % 0 to 1.0
0 to 1.0
Nickel (Ni), % 0
6.0 to 7.0
Niobium (Nb), % 0.3 to 0.6
0
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030
Titanium (Ti), % 0.1 to 0.6
0 to 0.25