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ACI-ASTM CA40 Steel vs. S31655 Stainless Steel

Both ACI-ASTM CA40 steel and S31655 stainless steel are iron alloys. They have 82% 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 S31655 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
210
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 10
39
Fatigue Strength, MPa 460
300
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
78
Tensile Strength: Ultimate (UTS), MPa 910
710
Tensile Strength: Yield (Proof), MPa 860
350

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 390
430
Maximum Temperature: Mechanical, °C 750
1010
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1500
1380
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 3.0
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
17
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.0
3.3
Embodied Energy, MJ/kg 28
46
Embodied Water, L/kg 100
160

Common Calculations

PREN (Pitting Resistance) 14
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 89
230
Resilience: Unit (Modulus of Resilience), kJ/m3 1910
310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 33
25
Strength to Weight: Bending, points 27
23
Thermal Diffusivity, mm2/s 6.7
4.0
Thermal Shock Resistance, points 33
16

Alloy Composition

Carbon (C), % 0.2 to 0.4
0 to 0.030
Chromium (Cr), % 11.5 to 14
19.5 to 21.5
Copper (Cu), % 0
0 to 1.0
Iron (Fe), % 81.5 to 88.3
63.2 to 71.9
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
0.5 to 1.5
Nickel (Ni), % 0 to 1.0
8.0 to 9.5
Nitrogen (N), % 0
0.14 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.015