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EN 1.7729 Steel vs. SAE-AISI 8645 Steel

Both EN 1.7729 steel and SAE-AISI 8645 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is EN 1.7729 steel and the bottom bar is SAE-AISI 8645 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 270
180 to 200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 17
12 to 23
Fatigue Strength, MPa 500
280 to 350
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 560
380 to 400
Tensile Strength: Ultimate (UTS), MPa 910
600 to 670
Tensile Strength: Yield (Proof), MPa 750
390 to 560

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 430
410
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 40
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 3.8
2.6
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.3
1.5
Embodied Energy, MJ/kg 49
20
Embodied Water, L/kg 59
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
77 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 1500
420 to 840
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 32
21 to 24
Strength to Weight: Bending, points 27
20 to 22
Thermal Diffusivity, mm2/s 11
10
Thermal Shock Resistance, points 27
18 to 20

Alloy Composition

Aluminum (Al), % 0.015 to 0.080
0
Arsenic (As), % 0 to 0.020
0
Boron (B), % 0.0010 to 0.010
0
Carbon (C), % 0.17 to 0.23
0.43 to 0.48
Chromium (Cr), % 0.9 to 1.2
0.4 to 0.6
Copper (Cu), % 0 to 0.2
0
Iron (Fe), % 94.8 to 97
96.5 to 97.7
Manganese (Mn), % 0.35 to 0.75
0.75 to 1.0
Molybdenum (Mo), % 0.9 to 1.1
0.15 to 0.25
Nickel (Ni), % 0 to 0.2
0.4 to 0.7
Phosphorus (P), % 0 to 0.020
0 to 0.035
Silicon (Si), % 0 to 0.4
0.15 to 0.35
Sulfur (S), % 0 to 0.015
0 to 0.040
Tin (Sn), % 0 to 0.020
0
Titanium (Ti), % 0.070 to 0.15
0
Vanadium (V), % 0.6 to 0.8
0