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ACI-ASTM CK20 Steel vs. S44635 Stainless Steel

Both ACI-ASTM CK20 steel and S44635 stainless steel are iron alloys. They have 83% 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 CK20 steel and the bottom bar is S44635 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
240
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 37
23
Fatigue Strength, MPa 220
390
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 78
81
Tensile Strength: Ultimate (UTS), MPa 530
710
Tensile Strength: Yield (Proof), MPa 260
580

Thermal Properties

Latent Heat of Fusion, J/g 310
300
Maximum Temperature: Corrosion, °C 440
610
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 14
16
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
22
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.4
4.4
Embodied Energy, MJ/kg 62
62
Embodied Water, L/kg 190
170

Common Calculations

PREN (Pitting Resistance) 26
39
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
150
Resilience: Unit (Modulus of Resilience), kJ/m3 170
810
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
25
Strength to Weight: Bending, points 19
23
Thermal Diffusivity, mm2/s 3.7
4.4
Thermal Shock Resistance, points 13
23

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.025
Chromium (Cr), % 23 to 27
24.5 to 26
Iron (Fe), % 46.7 to 58
61.5 to 68.5
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
3.5 to 4.5
Nickel (Ni), % 19 to 22
3.5 to 4.5
Niobium (Nb), % 0
0.2 to 0.8
Nitrogen (N), % 0
0 to 0.035
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 0.75
Sulfur (S), % 0 to 0.040
0 to 0.030
Titanium (Ti), % 0
0.2 to 0.8