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EN 1.4971 Stainless Steel vs. EN 1.4446 Stainless Steel

Both EN 1.4971 stainless steel and EN 1.4446 stainless steel are iron alloys. Both are furnished in the solution annealed (AT) condition. They have 66% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is EN 1.4971 stainless steel and the bottom bar is EN 1.4446 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
140
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
23
Fatigue Strength, MPa 270
160
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
79
Tensile Strength: Ultimate (UTS), MPa 800
490
Tensile Strength: Yield (Proof), MPa 340
240

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 570
410
Maximum Temperature: Mechanical, °C 1100
980
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
14
Thermal Expansion, µm/m-K 15
16

Otherwise Unclassified Properties

Base Metal Price, % relative 70
22
Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 7.6
4.5
Embodied Energy, MJ/kg 110
60
Embodied Water, L/kg 300
160

Common Calculations

PREN (Pitting Resistance) 38
34
Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
93
Resilience: Unit (Modulus of Resilience), kJ/m3 280
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 26
17
Strength to Weight: Bending, points 23
17
Thermal Diffusivity, mm2/s 3.4
3.6
Thermal Shock Resistance, points 19
11

Alloy Composition

Carbon (C), % 0.080 to 0.16
0 to 0.030
Chromium (Cr), % 20 to 22.5
16.5 to 18.5
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 37.1
59.7 to 66.9
Manganese (Mn), % 0 to 2.0
0 to 1.5
Molybdenum (Mo), % 2.5 to 3.5
4.0 to 4.5
Nickel (Ni), % 19 to 21
12.5 to 14.5
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0.1 to 0.2
0.12 to 0.22
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030
Tungsten (W), % 2.0 to 3.0
0