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ACI-ASTM CK20 Steel vs. S45000 Stainless Steel

Both ACI-ASTM CK20 steel and S45000 stainless steel are iron alloys. They have 75% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CK20 steel and the bottom bar is S45000 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
280 to 410
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 37
6.8 to 14
Fatigue Strength, MPa 220
330 to 650
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
76
Tensile Strength: Ultimate (UTS), MPa 530
980 to 1410
Tensile Strength: Yield (Proof), MPa 260
580 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 310
280
Maximum Temperature: Corrosion, °C 440
400
Maximum Temperature: Mechanical, °C 1100
840
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1430
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
17
Thermal Expansion, µm/m-K 15
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 25
13
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.4
2.8
Embodied Energy, MJ/kg 62
39
Embodied Water, L/kg 190
130

Common Calculations

PREN (Pitting Resistance) 26
17
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
94 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 170
850 to 4400
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
35 to 50
Strength to Weight: Bending, points 19
28 to 36
Thermal Diffusivity, mm2/s 3.7
4.5
Thermal Shock Resistance, points 13
33 to 47

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.050
Chromium (Cr), % 23 to 27
14 to 16
Copper (Cu), % 0
1.3 to 1.8
Iron (Fe), % 46.7 to 58
72.1 to 79.3
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
0.5 to 1.0
Nickel (Ni), % 19 to 22
5.0 to 7.0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030