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AISI 309 Stainless Steel vs. S40945 Stainless Steel

Both AISI 309 stainless steel and S40945 stainless steel are iron alloys. They have 74% of their average alloy composition in common.

For each property being compared, the top bar is AISI 309 stainless steel and the bottom bar is S40945 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 210
160
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 34 to 47
25
Fatigue Strength, MPa 250 to 280
160
Poisson's Ratio 0.27
0.28
Rockwell B Hardness 84
69
Shear Modulus, GPa 78
75
Shear Strength, MPa 420 to 470
270
Tensile Strength: Ultimate (UTS), MPa 600 to 710
430
Tensile Strength: Yield (Proof), MPa 260 to 350
230

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Maximum Temperature: Corrosion, °C 440
450
Maximum Temperature: Mechanical, °C 980
710
Melting Completion (Liquidus), °C 1450
1450
Melting Onset (Solidus), °C 1400
1410
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
26
Thermal Expansion, µm/m-K 15
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 19
8.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.6
2.2
Embodied Energy, MJ/kg 51
31
Embodied Water, L/kg 170
94

Common Calculations

PREN (Pitting Resistance) 23
11
Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
89
Resilience: Unit (Modulus of Resilience), kJ/m3 170 to 310
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21 to 25
15
Strength to Weight: Bending, points 20 to 23
16
Thermal Diffusivity, mm2/s 4.3
6.9
Thermal Shock Resistance, points 14 to 16
15

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.030
Chromium (Cr), % 22 to 24
10.5 to 11.7
Iron (Fe), % 58 to 66
85.1 to 89.3
Manganese (Mn), % 0 to 2.0
0 to 1.0
Nickel (Ni), % 12 to 15
0 to 0.5
Niobium (Nb), % 0
0.18 to 0.4
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 0.75
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0.050 to 0.2