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EN 1.4821 Stainless Steel vs. AISI 321 Stainless Steel

Both EN 1.4821 stainless steel and AISI 321 stainless steel are iron alloys. They have a moderately high 92% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4821 stainless steel and the bottom bar is AISI 321 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
170 to 210
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 18
34 to 50
Fatigue Strength, MPa 280
220 to 270
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 79
77
Shear Strength, MPa 450
420 to 460
Tensile Strength: Ultimate (UTS), MPa 730
590 to 690
Tensile Strength: Yield (Proof), MPa 450
220 to 350

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Maximum Temperature: Corrosion, °C 450
480
Maximum Temperature: Mechanical, °C 1100
870
Melting Completion (Liquidus), °C 1410
1430
Melting Onset (Solidus), °C 1370
1400
Specific Heat Capacity, J/kg-K 490
480
Thermal Conductivity, W/m-K 17
16
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 15
16
Density, g/cm3 7.6
7.8
Embodied Carbon, kg CO2/kg material 2.9
3.2
Embodied Energy, MJ/kg 41
45
Embodied Water, L/kg 160
140

Common Calculations

PREN (Pitting Resistance) 26
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
190 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 500
130 to 310
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 26
21 to 25
Strength to Weight: Bending, points 23
20 to 22
Thermal Diffusivity, mm2/s 4.6
4.1
Thermal Shock Resistance, points 21
13 to 15

Alloy Composition

Carbon (C), % 0.1 to 0.2
0 to 0.080
Chromium (Cr), % 24.5 to 26.5
17 to 19
Iron (Fe), % 64.2 to 71.1
65.3 to 74
Manganese (Mn), % 0 to 2.0
0 to 2.0
Nickel (Ni), % 3.5 to 5.5
9.0 to 12
Nitrogen (N), % 0 to 0.1
0 to 0.1
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0.8 to 1.5
0 to 0.75
Sulfur (S), % 0 to 0.015
0 to 0.030
Titanium (Ti), % 0
0 to 0.7