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EN 1.1221 Steel vs. SAE-AISI 81B45 Steel

Both EN 1.1221 steel and SAE-AISI 81B45 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is EN 1.1221 steel and the bottom bar is SAE-AISI 81B45 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 250
160 to 200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 10 to 21
12 to 24
Fatigue Strength, MPa 240 to 340
250 to 350
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Shear Strength, MPa 450 to 520
340 to 400
Tensile Strength: Ultimate (UTS), MPa 730 to 870
540 to 670
Tensile Strength: Yield (Proof), MPa 390 to 550
350 to 560

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
410
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 48
40
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.1
2.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.5
Embodied Energy, MJ/kg 19
20
Embodied Water, L/kg 47
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 67 to 130
77 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 410 to 800
320 to 840
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26 to 31
19 to 24
Strength to Weight: Bending, points 23 to 26
19 to 22
Thermal Diffusivity, mm2/s 13
11
Thermal Shock Resistance, points 23 to 28
17 to 21

Alloy Composition

Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 0.57 to 0.65
0.43 to 0.48
Chromium (Cr), % 0 to 0.4
0.35 to 0.55
Iron (Fe), % 97.1 to 98.8
97 to 98
Manganese (Mn), % 0.6 to 0.9
0.75 to 1.0
Molybdenum (Mo), % 0 to 0.1
0.080 to 0.15
Nickel (Ni), % 0 to 0.4
0.2 to 0.4
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0 to 0.4
0.15 to 0.35
Sulfur (S), % 0 to 0.035
0 to 0.040

Comparable Variants