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AISI 321 Stainless Steel vs. EN 1.7729 Steel

Both AISI 321 stainless steel and EN 1.7729 steel are iron alloys. They have 72% of their average alloy composition in common. There are 32 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 AISI 321 stainless steel and the bottom bar is EN 1.7729 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 210
270
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 34 to 50
17
Fatigue Strength, MPa 220 to 270
500
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Shear Strength, MPa 420 to 460
560
Tensile Strength: Ultimate (UTS), MPa 590 to 690
910
Tensile Strength: Yield (Proof), MPa 220 to 350
750

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 870
430
Melting Completion (Liquidus), °C 1430
1470
Melting Onset (Solidus), °C 1400
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
40
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 16
3.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.2
3.3
Embodied Energy, MJ/kg 45
49
Embodied Water, L/kg 140
59

Common Calculations

PREN (Pitting Resistance) 19
4.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190 to 230
150
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 310
1500
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21 to 25
32
Strength to Weight: Bending, points 20 to 22
27
Thermal Diffusivity, mm2/s 4.1
11
Thermal Shock Resistance, points 13 to 15
27

Alloy Composition

Aluminum (Al), % 0
0.015 to 0.080
Arsenic (As), % 0
0 to 0.020
Boron (B), % 0
0.0010 to 0.010
Carbon (C), % 0 to 0.080
0.17 to 0.23
Chromium (Cr), % 17 to 19
0.9 to 1.2
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 65.3 to 74
94.8 to 97
Manganese (Mn), % 0 to 2.0
0.35 to 0.75
Molybdenum (Mo), % 0
0.9 to 1.1
Nickel (Ni), % 9.0 to 12
0 to 0.2
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0 to 0.020
Silicon (Si), % 0 to 0.75
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.015
Tin (Sn), % 0
0 to 0.020
Titanium (Ti), % 0 to 0.7
0.070 to 0.15
Vanadium (V), % 0
0.6 to 0.8