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EN 1.8888 Steel vs. EN 1.7221 Steel

Both EN 1.8888 steel and EN 1.7221 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is EN 1.8888 steel and the bottom bar is EN 1.7221 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
200 to 230
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16
11 to 17
Fatigue Strength, MPa 470
290 to 390
Impact Strength: V-Notched Charpy, J 110
20 to 38
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 830
650 to 780
Tensile Strength: Yield (Proof), MPa 720
430 to 630

Thermal Properties

Latent Heat of Fusion, J/g 260
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 40
44
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.1
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 9.3
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 3.7
2.4
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.9
1.5
Embodied Energy, MJ/kg 26
20
Embodied Water, L/kg 54
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
83 to 98
Resilience: Unit (Modulus of Resilience), kJ/m3 1370
490 to 1050
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29
23 to 27
Strength to Weight: Bending, points 25
21 to 24
Thermal Diffusivity, mm2/s 11
12
Thermal Shock Resistance, points 24
19 to 23

Alloy Composition

Boron (B), % 0 to 0.0050
0
Carbon (C), % 0 to 0.2
0.22 to 0.29
Chromium (Cr), % 0 to 1.5
0.8 to 1.2
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 91.9 to 100
96.8 to 98.3
Manganese (Mn), % 0 to 1.7
0.5 to 0.8
Molybdenum (Mo), % 0 to 0.7
0.15 to 0.3
Nickel (Ni), % 0 to 2.5
0
Niobium (Nb), % 0 to 0.060
0
Nitrogen (N), % 0 to 0.015
0
Phosphorus (P), % 0 to 0.020
0 to 0.025
Silicon (Si), % 0 to 0.8
0 to 0.6
Sulfur (S), % 0 to 0.0050
0 to 0.030
Titanium (Ti), % 0 to 0.050
0
Vanadium (V), % 0 to 0.12
0
Zirconium (Zr), % 0 to 0.15
0