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S38100 Stainless Steel vs. AISI 309 Stainless Steel

Both S38100 stainless steel and AISI 309 stainless steel are iron alloys. They have a moderately high 94% of their average alloy composition in common.

For each property being compared, the top bar is S38100 stainless steel and the bottom bar is AISI 309 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
180 to 210
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 45
34 to 47
Fatigue Strength, MPa 210
250 to 280
Poisson's Ratio 0.28
0.27
Rockwell B Hardness 84
84
Shear Modulus, GPa 76
78
Shear Strength, MPa 400
420 to 470
Tensile Strength: Ultimate (UTS), MPa 580
600 to 710
Tensile Strength: Yield (Proof), MPa 230
260 to 350

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Corrosion, °C 410
440
Maximum Temperature: Mechanical, °C 970
980
Melting Completion (Liquidus), °C 1400
1450
Melting Onset (Solidus), °C 1350
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 16
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 20
19
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.8
3.6
Embodied Energy, MJ/kg 54
51
Embodied Water, L/kg 160
170

Common Calculations

PREN (Pitting Resistance) 18
23
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 140
170 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21
21 to 25
Strength to Weight: Bending, points 20
20 to 23
Thermal Diffusivity, mm2/s 4.0
4.3
Thermal Shock Resistance, points 13
14 to 16

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.2
Chromium (Cr), % 17 to 19
22 to 24
Iron (Fe), % 57.9 to 64
58 to 66
Manganese (Mn), % 0 to 2.0
0 to 2.0
Nickel (Ni), % 17.5 to 18.5
12 to 15
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 1.5 to 2.5
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030