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AISI 321 Stainless Steel vs. EN 1.4306 Stainless Steel

Both AISI 321 stainless steel and EN 1.4306 stainless steel are iron alloys. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is AISI 321 stainless steel and the bottom bar is EN 1.4306 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 210
190 to 270
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34 to 50
14 to 45
Fatigue Strength, MPa 220 to 270
190 to 330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 420 to 460
400 to 550
Tensile Strength: Ultimate (UTS), MPa 590 to 690
580 to 900
Tensile Strength: Yield (Proof), MPa 220 to 350
210 to 570

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 480
420
Maximum Temperature: Mechanical, °C 870
960
Melting Completion (Liquidus), °C 1430
1420
Melting Onset (Solidus), °C 1400
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 17
16

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 16
16
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.2
3.2
Embodied Energy, MJ/kg 45
45
Embodied Water, L/kg 140
150

Common Calculations

PREN (Pitting Resistance) 19
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190 to 230
110 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 310
110 to 820
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21 to 25
21 to 32
Strength to Weight: Bending, points 20 to 22
20 to 27
Thermal Diffusivity, mm2/s 4.1
4.0
Thermal Shock Resistance, points 13 to 15
13 to 20

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.030
Chromium (Cr), % 17 to 19
18 to 20
Iron (Fe), % 65.3 to 74
64.8 to 72
Manganese (Mn), % 0 to 2.0
0 to 2.0
Nickel (Ni), % 9.0 to 12
10 to 12
Nitrogen (N), % 0 to 0.1
0 to 0.1
Phosphorus (P), % 0 to 0.045
0 to 0.045
Silicon (Si), % 0 to 0.75
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015
Titanium (Ti), % 0 to 0.7
0