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EN 1.7709 Steel vs. EN 1.3551 Steel

Both EN 1.7709 steel and EN 1.3551 steel are iron alloys. They have a moderately high 93% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.7709 steel and the bottom bar is EN 1.3551 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 230
220
Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
75
Tensile Strength: Ultimate (UTS), MPa 650 to 780
720

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 440
530
Melting Completion (Liquidus), °C 1470
1490
Melting Onset (Solidus), °C 1420
1450
Specific Heat Capacity, J/kg-K 470
460
Thermal Conductivity, W/m-K 33
36
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
8.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
9.9

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
9.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.3
4.9
Embodied Energy, MJ/kg 32
71
Embodied Water, L/kg 56
82

Common Calculations

PREN (Pitting Resistance) 3.6
18
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23 to 27
26
Strength to Weight: Bending, points 21 to 24
23
Thermal Diffusivity, mm2/s 8.9
9.8
Thermal Shock Resistance, points 22 to 26
21

Alloy Composition

Aluminum (Al), % 0 to 0.030
0
Carbon (C), % 0.17 to 0.25
0.77 to 0.85
Chromium (Cr), % 1.2 to 1.5
3.9 to 4.3
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 95.2 to 97.5
88.8 to 91.1
Manganese (Mn), % 0.4 to 0.8
0.15 to 0.35
Molybdenum (Mo), % 0.55 to 0.8
4.0 to 4.5
Nickel (Ni), % 0 to 0.6
0
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.4
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.015
Tungsten (W), % 0
0 to 0.25
Vanadium (V), % 0.2 to 0.35
0.9 to 1.1