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ACI-ASTM CK20 Steel vs. EN 1.4951 Stainless Steel

Both ACI-ASTM CK20 steel and EN 1.4951 stainless steel are iron alloys. Their average alloy composition is basically identical. 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 EN 1.4951 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
170
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 37
38
Fatigue Strength, MPa 220
190
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 78
79
Tensile Strength: Ultimate (UTS), MPa 530
630
Tensile Strength: Yield (Proof), MPa 260
220

Thermal Properties

Latent Heat of Fusion, J/g 310
300
Maximum Temperature: Corrosion, °C 440
450
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1400
1410
Melting Onset (Solidus), °C 1430
1360
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
15
Thermal Expansion, µm/m-K 15
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 25
25
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 4.4
4.3
Embodied Energy, MJ/kg 62
61
Embodied Water, L/kg 190
190

Common Calculations

PREN (Pitting Resistance) 26
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
190
Resilience: Unit (Modulus of Resilience), kJ/m3 170
130
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
22
Strength to Weight: Bending, points 19
21
Thermal Diffusivity, mm2/s 3.7
3.9
Thermal Shock Resistance, points 13
14

Alloy Composition

Carbon (C), % 0 to 0.2
0.040 to 0.080
Chromium (Cr), % 23 to 27
24 to 26
Iron (Fe), % 46.7 to 58
49.1 to 57
Manganese (Mn), % 0 to 2.0
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 19 to 22
19 to 22
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 2.0
0 to 0.7
Sulfur (S), % 0 to 0.040
0 to 0.015