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EN 1.4309 Stainless Steel vs. EN 1.4821 Stainless Steel

Both EN 1.4309 stainless steel and EN 1.4821 stainless steel are iron alloys. Both are furnished in the solution annealed (AT) condition. They have a moderately high 93% 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 1.4309 stainless steel and the bottom bar is EN 1.4821 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
200
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34
18
Fatigue Strength, MPa 170
280
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 77
79
Tensile Strength: Ultimate (UTS), MPa 490
730
Tensile Strength: Yield (Proof), MPa 210
450

Thermal Properties

Latent Heat of Fusion, J/g 290
310
Maximum Temperature: Corrosion, °C 420
450
Maximum Temperature: Mechanical, °C 960
1100
Melting Completion (Liquidus), °C 1420
1410
Melting Onset (Solidus), °C 1380
1370
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 15
17
Thermal Expansion, µm/m-K 17
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 16
15
Density, g/cm3 7.8
7.6
Embodied Carbon, kg CO2/kg material 3.1
2.9
Embodied Energy, MJ/kg 45
41
Embodied Water, L/kg 150
160

Common Calculations

PREN (Pitting Resistance) 21
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
110
Resilience: Unit (Modulus of Resilience), kJ/m3 110
500
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
26
Strength to Weight: Axial, points 18
26
Strength to Weight: Bending, points 18
23
Thermal Diffusivity, mm2/s 4.1
4.6
Thermal Shock Resistance, points 11
21

Alloy Composition

Carbon (C), % 0 to 0.030
0.1 to 0.2
Chromium (Cr), % 18 to 20
24.5 to 26.5
Iron (Fe), % 64.2 to 73
64.2 to 71.1
Manganese (Mn), % 0 to 2.0
0 to 2.0
Nickel (Ni), % 9.0 to 12
3.5 to 5.5
Nitrogen (N), % 0 to 0.2
0 to 0.1
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0 to 1.5
0.8 to 1.5
Sulfur (S), % 0 to 0.025
0 to 0.015