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S33550 Stainless Steel vs. S43940 Stainless Steel

Both S33550 stainless steel and S43940 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 73% of their average alloy composition in common.

For each property being compared, the top bar is S33550 stainless steel and the bottom bar is S43940 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
160
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
21
Fatigue Strength, MPa 270
180
Poisson's Ratio 0.27
0.28
Rockwell B Hardness 82
76
Shear Modulus, GPa 79
77
Shear Strength, MPa 470
310
Tensile Strength: Ultimate (UTS), MPa 680
490
Tensile Strength: Yield (Proof), MPa 310
280

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Corrosion, °C 470
540
Maximum Temperature: Mechanical, °C 1100
890
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1360
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
25
Thermal Expansion, µm/m-K 16
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
3.4

Otherwise Unclassified Properties

Base Metal Price, % relative 24
12
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 4.3
2.6
Embodied Energy, MJ/kg 61
38
Embodied Water, L/kg 190
120

Common Calculations

PREN (Pitting Resistance) 30
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
86
Resilience: Unit (Modulus of Resilience), kJ/m3 250
200
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
18
Strength to Weight: Bending, points 22
18
Thermal Diffusivity, mm2/s 3.9
6.8
Thermal Shock Resistance, points 15
18

Alloy Composition

Carbon (C), % 0.040 to 0.1
0 to 0.030
Cerium (Ce), % 0.025 to 0.070
0
Chromium (Cr), % 25 to 28
17.5 to 18.5
Iron (Fe), % 48.8 to 58.2
78.2 to 82.1
Lanthanum (La), % 0.025 to 0.070
0
Manganese (Mn), % 0 to 1.5
0 to 1.0
Nickel (Ni), % 16.5 to 20
0
Niobium (Nb), % 0.050 to 0.15
0.3 to 0.6
Nitrogen (N), % 0.18 to 0.25
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015
Titanium (Ti), % 0
0.1 to 0.6