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EN 1.7707 Steel vs. EN 1.7729 Steel

Both EN 1.7707 steel and EN 1.7729 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 33 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 EN 1.7707 steel and the bottom bar is EN 1.7729 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 300
270
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
17
Fatigue Strength, MPa 500
500
Impact Strength: V-Notched Charpy, J 31
46
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 600
560
Tensile Strength: Ultimate (UTS), MPa 1010
910
Tensile Strength: Yield (Proof), MPa 800
750

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 460
430
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 39
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 3.3
3.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.9
3.3
Embodied Energy, MJ/kg 27
49
Embodied Water, L/kg 58
59

Common Calculations

PREN (Pitting Resistance) 3.2
4.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
150
Resilience: Unit (Modulus of Resilience), kJ/m3 1690
1500
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 36
32
Strength to Weight: Bending, points 29
27
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 29
27

Alloy Composition

Aluminum (Al), % 0
0.015 to 0.080
Arsenic (As), % 0
0 to 0.020
Boron (B), % 0
0.0010 to 0.010
Carbon (C), % 0.26 to 0.34
0.17 to 0.23
Chromium (Cr), % 2.3 to 2.7
0.9 to 1.2
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 94.7 to 96.8
94.8 to 97
Manganese (Mn), % 0.4 to 0.7
0.35 to 0.75
Molybdenum (Mo), % 0.15 to 0.25
0.9 to 1.1
Nickel (Ni), % 0 to 0.6
0 to 0.2
Phosphorus (P), % 0 to 0.035
0 to 0.020
Silicon (Si), % 0 to 0.4
0 to 0.4
Sulfur (S), % 0 to 0.035
0 to 0.015
Tin (Sn), % 0
0 to 0.020
Titanium (Ti), % 0
0.070 to 0.15
Vanadium (V), % 0.1 to 0.2
0.6 to 0.8