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ASTM A372 Grade K Steel vs. EN 1.8550 Steel

Both ASTM A372 grade K steel and EN 1.8550 steel are iron alloys. Both are furnished in the quenched and tempered condition. They have a very high 98% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is ASTM A372 grade K steel and the bottom bar is EN 1.8550 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
300
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 23
11
Fatigue Strength, MPa 440
470
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 490
600
Tensile Strength: Ultimate (UTS), MPa 780
1000
Tensile Strength: Yield (Proof), MPa 620
760

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 440
440
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 48
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 4.4
3.4
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
1.7
Embodied Energy, MJ/kg 24
23
Embodied Water, L/kg 57
67

Common Calculations

PREN (Pitting Resistance) 2.7
2.3
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
100
Resilience: Unit (Modulus of Resilience), kJ/m3 1010
1550
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 27
36
Strength to Weight: Bending, points 24
29
Thermal Diffusivity, mm2/s 13
11
Thermal Shock Resistance, points 23
29

Alloy Composition

Aluminum (Al), % 0
0.8 to 1.2
Carbon (C), % 0 to 0.18
0.3 to 0.37
Chromium (Cr), % 1.0 to 1.8
1.5 to 1.8
Iron (Fe), % 93.4 to 96.6
94.4 to 96.3
Manganese (Mn), % 0.1 to 0.4
0.4 to 0.7
Molybdenum (Mo), % 0.2 to 0.6
0.15 to 0.25
Nickel (Ni), % 2.0 to 3.3
0.85 to 1.2
Phosphorus (P), % 0 to 0.015
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0 to 0.4
Sulfur (S), % 0 to 0.010
0 to 0.035