EN 1.7779 Steel vs. AISI 321 Stainless Steel
Both EN 1.7779 steel and AISI 321 stainless steel are iron alloys. They have 74% of their average alloy composition in common. There are 32 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 1.7779 steel and the bottom bar is AISI 321 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
Brinell Hardness | 240 | |
170 to 210 |
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
200 |
Elongation at Break, % | 16 | |
34 to 50 |
Fatigue Strength, MPa | 430 | |
220 to 270 |
Poisson's Ratio | 0.29 | |
0.28 |
Shear Modulus, GPa | 73 | |
77 |
Shear Strength, MPa | 500 | |
420 to 460 |
Tensile Strength: Ultimate (UTS), MPa | 810 | |
590 to 690 |
Tensile Strength: Yield (Proof), MPa | 660 | |
220 to 350 |
Thermal Properties
Latent Heat of Fusion, J/g | 260 | |
290 |
Maximum Temperature: Mechanical, °C | 470 | |
870 |
Melting Completion (Liquidus), °C | 1460 | |
1430 |
Melting Onset (Solidus), °C | 1420 | |
1400 |
Specific Heat Capacity, J/kg-K | 470 | |
480 |
Thermal Conductivity, W/m-K | 39 | |
16 |
Thermal Expansion, µm/m-K | 13 | |
17 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.7 | |
2.4 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.9 | |
2.7 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 4.0 | |
16 |
Density, g/cm3 | 7.8 | |
7.8 |
Embodied Carbon, kg CO2/kg material | 2.8 | |
3.2 |
Embodied Energy, MJ/kg | 41 | |
45 |
Embodied Water, L/kg | 64 | |
140 |
Common Calculations
PREN (Pitting Resistance) | 5.0 | |
19 |
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
190 to 230 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 1150 | |
130 to 310 |
Stiffness to Weight: Axial, points | 13 | |
14 |
Stiffness to Weight: Bending, points | 24 | |
25 |
Strength to Weight: Axial, points | 29 | |
21 to 25 |
Strength to Weight: Bending, points | 25 | |
20 to 22 |
Thermal Diffusivity, mm2/s | 11 | |
4.1 |
Thermal Shock Resistance, points | 23 | |
13 to 15 |
Alloy Composition
Aluminum (Al), % | 0 to 0.040 | |
0 |
Carbon (C), % | 0.17 to 0.23 | |
0 to 0.080 |
Chromium (Cr), % | 3.0 to 3.3 | |
17 to 19 |
Copper (Cu), % | 0 to 0.3 | |
0 |
Iron (Fe), % | 93.8 to 95.4 | |
65.3 to 74 |
Manganese (Mn), % | 0.3 to 0.5 | |
0 to 2.0 |
Molybdenum (Mo), % | 0.5 to 0.6 | |
0 |
Nickel (Ni), % | 0 to 0.3 | |
9.0 to 12 |
Nitrogen (N), % | 0 | |
0 to 0.1 |
Phosphorus (P), % | 0 to 0.025 | |
0 to 0.045 |
Silicon (Si), % | 0.15 to 0.35 | |
0 to 0.75 |
Sulfur (S), % | 0 to 0.010 | |
0 to 0.030 |
Titanium (Ti), % | 0 | |
0 to 0.7 |
Vanadium (V), % | 0.45 to 0.55 | |
0 |