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EN 1.6958 Steel vs. EN 1.7221 Steel

Both EN 1.6958 steel and EN 1.7221 steel are iron alloys. They have a very high 96% 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 1.6958 steel and the bottom bar is EN 1.7221 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 340
200 to 230
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16
11 to 17
Fatigue Strength, MPa 700
290 to 390
Impact Strength: V-Notched Charpy, J 63
20 to 38
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 1140
650 to 780
Tensile Strength: Yield (Proof), MPa 1070
430 to 630

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 450
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 47
44
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
2.4
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.0
1.5
Embodied Energy, MJ/kg 27
20
Embodied Water, L/kg 60
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
83 to 98
Resilience: Unit (Modulus of Resilience), kJ/m3 3050
490 to 1050
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 40
23 to 27
Strength to Weight: Bending, points 31
21 to 24
Thermal Diffusivity, mm2/s 13
12
Thermal Shock Resistance, points 39
19 to 23

Alloy Composition

Aluminum (Al), % 0.0050 to 0.050
0
Carbon (C), % 0.25 to 0.3
0.22 to 0.29
Chromium (Cr), % 1.2 to 1.7
0.8 to 1.2
Iron (Fe), % 92.6 to 94.5
96.8 to 98.3
Manganese (Mn), % 0.2 to 0.5
0.5 to 0.8
Molybdenum (Mo), % 0.35 to 0.55
0.15 to 0.3
Nickel (Ni), % 3.3 to 3.8
0
Phosphorus (P), % 0 to 0.020
0 to 0.025
Silicon (Si), % 0.15 to 0.3
0 to 0.6
Sulfur (S), % 0 to 0.015
0 to 0.030
Vanadium (V), % 0 to 0.12
0