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ACI-ASTM CK20 Steel vs. S42300 Stainless Steel

Both ACI-ASTM CK20 steel and S42300 stainless steel are iron alloys. Both are furnished in the heat treated (HT) condition. They have 66% 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 S42300 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
330
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 37
9.1
Fatigue Strength, MPa 220
440
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
77
Tensile Strength: Ultimate (UTS), MPa 530
1100
Tensile Strength: Yield (Proof), MPa 260
850

Thermal Properties

Latent Heat of Fusion, J/g 310
270
Maximum Temperature: Corrosion, °C 440
380
Maximum Temperature: Mechanical, °C 1100
750
Melting Completion (Liquidus), °C 1400
1470
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 14
25
Thermal Expansion, µm/m-K 15
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
4.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
5.2

Otherwise Unclassified Properties

Base Metal Price, % relative 25
9.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.4
3.2
Embodied Energy, MJ/kg 62
44
Embodied Water, L/kg 190
110

Common Calculations

PREN (Pitting Resistance) 26
21
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
93
Resilience: Unit (Modulus of Resilience), kJ/m3 170
1840
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
39
Strength to Weight: Bending, points 19
30
Thermal Diffusivity, mm2/s 3.7
6.8
Thermal Shock Resistance, points 13
40

Alloy Composition

Carbon (C), % 0 to 0.2
0.27 to 0.32
Chromium (Cr), % 23 to 27
11 to 12
Iron (Fe), % 46.7 to 58
82 to 85.1
Manganese (Mn), % 0 to 2.0
1.0 to 1.4
Molybdenum (Mo), % 0 to 0.5
2.5 to 3.0
Nickel (Ni), % 19 to 22
0 to 0.5
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 2.0
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.025
Vanadium (V), % 0
0.2 to 0.3