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ACI-ASTM CA40 Steel vs. AISI 446 Stainless Steel

Both ACI-ASTM CA40 steel and AISI 446 stainless steel are iron alloys. They have 87% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (4, 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 446 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 10
23
Fatigue Strength, MPa 460
200
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 76
79
Tensile Strength: Ultimate (UTS), MPa 910
570
Tensile Strength: Yield (Proof), MPa 860
300

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 390
440
Maximum Temperature: Mechanical, °C 750
1180
Melting Completion (Liquidus), °C 1440
1510
Melting Onset (Solidus), °C 1500
1430
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 25
17
Thermal Expansion, µm/m-K 10
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
12
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.0
2.4
Embodied Energy, MJ/kg 28
35
Embodied Water, L/kg 100
150

Common Calculations

PREN (Pitting Resistance) 14
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 89
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1910
230
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
26
Strength to Weight: Axial, points 33
21
Strength to Weight: Bending, points 27
20
Thermal Diffusivity, mm2/s 6.7
4.6
Thermal Shock Resistance, points 33
19

Alloy Composition

Carbon (C), % 0.2 to 0.4
0 to 0.2
Chromium (Cr), % 11.5 to 14
23 to 27
Iron (Fe), % 81.5 to 88.3
69.2 to 77
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 1.0
0 to 0.75
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030