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EN 1.1221 Steel vs. EN 1.7706 Steel

Both EN 1.1221 steel and EN 1.7706 steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 30 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 1.1221 steel and the bottom bar is EN 1.7706 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 250
210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 10 to 21
17
Fatigue Strength, MPa 240 to 340
330
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Tensile Strength: Ultimate (UTS), MPa 730 to 870
690
Tensile Strength: Yield (Proof), MPa 390 to 550
500

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 400
440
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1410
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 48
40
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 2.1
3.7
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.5
2.3
Embodied Energy, MJ/kg 19
32
Embodied Water, L/kg 47
57

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 67 to 130
110
Resilience: Unit (Modulus of Resilience), kJ/m3 410 to 800
670
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26 to 31
24
Strength to Weight: Bending, points 23 to 26
22
Thermal Diffusivity, mm2/s 13
11
Thermal Shock Resistance, points 23 to 28
20

Alloy Composition

Carbon (C), % 0.57 to 0.65
0.15 to 0.2
Chromium (Cr), % 0 to 0.4
1.2 to 1.5
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 97.1 to 98.8
94.7 to 97.1
Manganese (Mn), % 0.6 to 0.9
0.5 to 0.9
Molybdenum (Mo), % 0 to 0.1
0.9 to 1.1
Nickel (Ni), % 0 to 0.4
0 to 0.4
Phosphorus (P), % 0 to 0.035
0 to 0.020
Silicon (Si), % 0 to 0.4
0 to 0.6
Sulfur (S), % 0 to 0.035
0 to 0.015
Vanadium (V), % 0
0.2 to 0.3