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AISI 446 Stainless Steel vs. ACI-ASTM CK20 Steel

Both AISI 446 stainless steel and ACI-ASTM CK20 steel are iron alloys. They have 79% 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 AISI 446 stainless steel and the bottom bar is ACI-ASTM CK20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
150
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 23
37
Fatigue Strength, MPa 200
220
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 79
78
Tensile Strength: Ultimate (UTS), MPa 570
530
Tensile Strength: Yield (Proof), MPa 300
260

Thermal Properties

Latent Heat of Fusion, J/g 290
310
Maximum Temperature: Corrosion, °C 440
440
Maximum Temperature: Mechanical, °C 1180
1100
Melting Completion (Liquidus), °C 1510
1400
Melting Onset (Solidus), °C 1430
1430
Specific Heat Capacity, J/kg-K 490
480
Thermal Conductivity, W/m-K 17
14
Thermal Expansion, µm/m-K 11
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 12
25
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.4
4.4
Embodied Energy, MJ/kg 35
62
Embodied Water, L/kg 150
190

Common Calculations

PREN (Pitting Resistance) 27
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
160
Resilience: Unit (Modulus of Resilience), kJ/m3 230
170
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 21
19
Strength to Weight: Bending, points 20
19
Thermal Diffusivity, mm2/s 4.6
3.7
Thermal Shock Resistance, points 19
13

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.2
Chromium (Cr), % 23 to 27
23 to 27
Iron (Fe), % 69.2 to 77
46.7 to 58
Manganese (Mn), % 0 to 1.5
0 to 2.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0 to 0.75
19 to 22
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040