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EN 1.7720 Steel vs. AISI 317 Stainless Steel

Both EN 1.7720 steel and AISI 317 stainless steel are iron alloys. They have 65% 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 1.7720 steel and the bottom bar is AISI 317 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
170 to 220
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 19
35 to 55
Fatigue Strength, MPa 230
250 to 330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
79
Tensile Strength: Ultimate (UTS), MPa 590
580 to 710
Tensile Strength: Yield (Proof), MPa 340
250 to 420

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 410
590
Melting Completion (Liquidus), °C 1470
1400
Melting Onset (Solidus), °C 1430
1380
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 40
15
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
21
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 2.2
4.3
Embodied Energy, MJ/kg 30
59
Embodied Water, L/kg 51
160

Common Calculations

PREN (Pitting Resistance) 2.1
31
Resilience: Ultimate (Unit Rupture Work), MJ/m3 97
210 to 260
Resilience: Unit (Modulus of Resilience), kJ/m3 300
150 to 430
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21
20 to 25
Strength to Weight: Bending, points 20
20 to 22
Thermal Diffusivity, mm2/s 11
4.1
Thermal Shock Resistance, points 17
12 to 15

Alloy Composition

Carbon (C), % 0.1 to 0.15
0 to 0.080
Chromium (Cr), % 0.3 to 0.5
18 to 20
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 96.6 to 98.6
58 to 68
Manganese (Mn), % 0.4 to 0.7
0 to 2.0
Molybdenum (Mo), % 0.4 to 0.6
3.0 to 4.0
Nickel (Ni), % 0 to 0.4
11 to 15
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0 to 0.45
0 to 0.75
Sulfur (S), % 0 to 0.020
0 to 0.030
Vanadium (V), % 0.22 to 0.3
0