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EN 1.7201 Steel vs. EN 1.7701 Steel

Both EN 1.7201 steel and EN 1.7701 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is EN 1.7201 steel and the bottom bar is EN 1.7701 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 130 to 160
200 to 480
Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 430 to 1300
670 to 2010

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 420
420
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 45
44
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 2.5
2.6
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.9
Embodied Energy, MJ/kg 20
26
Embodied Water, L/kg 51
52

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 15 to 46
24 to 71
Strength to Weight: Bending, points 16 to 34
22 to 45
Thermal Diffusivity, mm2/s 12
12
Thermal Shock Resistance, points 13 to 38
20 to 59

Alloy Composition

Carbon (C), % 0.1 to 0.15
0.48 to 0.56
Chromium (Cr), % 0.9 to 1.2
0.9 to 1.2
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 96.9 to 98.3
96.2 to 97.7
Manganese (Mn), % 0.6 to 0.9
0.7 to 1.1
Molybdenum (Mo), % 0.15 to 0.25
0.15 to 0.3
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.3
0 to 0.4
Sulfur (S), % 0 to 0.025
0 to 0.025
Vanadium (V), % 0
0.1 to 0.2

Comparable Variants