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ACI-ASTM CK20 Steel vs. EN 1.4825 Stainless Steel

Both ACI-ASTM CK20 steel and EN 1.4825 stainless steel are iron alloys. They have 82% of their average alloy composition in common.

For each property being compared, the top bar is ACI-ASTM CK20 steel and the bottom bar is EN 1.4825 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
150
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 37
17
Fatigue Strength, MPa 220
160
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
77
Tensile Strength: Ultimate (UTS), MPa 530
510
Tensile Strength: Yield (Proof), MPa 260
260

Thermal Properties

Latent Heat of Fusion, J/g 310
300
Maximum Temperature: Corrosion, °C 440
410
Maximum Temperature: Mechanical, °C 1100
900
Melting Completion (Liquidus), °C 1400
1410
Melting Onset (Solidus), °C 1430
1370
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
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 25
15
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 4.4
3.1
Embodied Energy, MJ/kg 62
43
Embodied Water, L/kg 190
140

Common Calculations

PREN (Pitting Resistance) 26
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
72
Resilience: Unit (Modulus of Resilience), kJ/m3 170
170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
18
Strength to Weight: Bending, points 19
18
Thermal Diffusivity, mm2/s 3.7
4.0
Thermal Shock Resistance, points 13
12

Alloy Composition

Carbon (C), % 0 to 0.2
0.15 to 0.35
Chromium (Cr), % 23 to 27
17 to 19
Iron (Fe), % 46.7 to 58
65.6 to 74.4
Manganese (Mn), % 0 to 2.0
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
0 to 0.5
Nickel (Ni), % 19 to 22
8.0 to 10
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
0.5 to 2.5
Sulfur (S), % 0 to 0.040
0 to 0.030