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ACI-ASTM CA40 Steel vs. AISI 309 Stainless Steel

Both ACI-ASTM CA40 steel and AISI 309 stainless steel are iron alloys. They have 76% of their average alloy composition in common. There are 32 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 ACI-ASTM CA40 steel and the bottom bar is AISI 309 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
180 to 210
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 10
34 to 47
Fatigue Strength, MPa 460
250 to 280
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 76
78
Tensile Strength: Ultimate (UTS), MPa 910
600 to 710
Tensile Strength: Yield (Proof), MPa 860
260 to 350

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 390
440
Maximum Temperature: Mechanical, °C 750
980
Melting Completion (Liquidus), °C 1440
1450
Melting Onset (Solidus), °C 1500
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
16
Thermal Expansion, µm/m-K 10
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
19
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.0
3.6
Embodied Energy, MJ/kg 28
51
Embodied Water, L/kg 100
170

Common Calculations

PREN (Pitting Resistance) 14
23
Resilience: Ultimate (Unit Rupture Work), MJ/m3 89
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 1910
170 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 33
21 to 25
Strength to Weight: Bending, points 27
20 to 23
Thermal Diffusivity, mm2/s 6.7
4.3
Thermal Shock Resistance, points 33
14 to 16

Alloy Composition

Carbon (C), % 0.2 to 0.4
0 to 0.2
Chromium (Cr), % 11.5 to 14
22 to 24
Iron (Fe), % 81.5 to 88.3
58 to 66
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 1.0
12 to 15
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.5
0 to 0.75
Sulfur (S), % 0 to 0.040
0 to 0.030