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S43940 Stainless Steel vs. S33550 Stainless Steel

Both S43940 stainless steel and S33550 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 S43940 stainless steel and the bottom bar is S33550 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

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
1400
Melting Onset (Solidus), °C 1400
1360
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
15
Thermal Expansion, µm/m-K 10
16

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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