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EN 1.1221 Steel vs. S31730 Stainless Steel

Both EN 1.1221 steel and S31730 stainless steel are iron alloys. They have 58% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is EN 1.1221 steel and the bottom bar is S31730 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 250
180
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 10 to 21
40
Fatigue Strength, MPa 240 to 340
170
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
77
Shear Strength, MPa 450 to 520
370
Tensile Strength: Ultimate (UTS), MPa 730 to 870
540
Tensile Strength: Yield (Proof), MPa 390 to 550
200

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 400
990
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1410
1390
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 2.1
24
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 1.5
4.6
Embodied Energy, MJ/kg 19
63
Embodied Water, L/kg 47
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 67 to 130
170
Resilience: Unit (Modulus of Resilience), kJ/m3 410 to 800
99
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26 to 31
19
Strength to Weight: Bending, points 23 to 26
18
Thermal Shock Resistance, points 23 to 28
12

Alloy Composition

Carbon (C), % 0.57 to 0.65
0 to 0.030
Chromium (Cr), % 0 to 0.4
17 to 19
Copper (Cu), % 0
4.0 to 5.0
Iron (Fe), % 97.1 to 98.8
52.4 to 61
Manganese (Mn), % 0.6 to 0.9
0 to 2.0
Molybdenum (Mo), % 0 to 0.1
3.0 to 4.0
Nickel (Ni), % 0 to 0.4
15 to 16.5
Nitrogen (N), % 0
0 to 0.045
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.035
0 to 0.010