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EN 1.4912 Stainless Steel vs. EN 1.4406 Stainless Steel

Both EN 1.4912 stainless steel and EN 1.4406 stainless steel are iron alloys. Both are furnished in the solution annealed (AT) condition. They have a very high 97% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4912 stainless steel and the bottom bar is EN 1.4406 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
220
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
42
Fatigue Strength, MPa 200
280
Impact Strength: V-Notched Charpy, J 90
90
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
78
Shear Strength, MPa 420
470
Tensile Strength: Ultimate (UTS), MPa 610
680
Tensile Strength: Yield (Proof), MPa 230
320

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 520
410
Maximum Temperature: Mechanical, °C 940
950
Melting Completion (Liquidus), °C 1430
1440
Melting Onset (Solidus), °C 1390
1400
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 16
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 20
18
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.8
3.7
Embodied Energy, MJ/kg 55
51
Embodied Water, L/kg 140
150

Common Calculations

PREN (Pitting Resistance) 18
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
240
Resilience: Unit (Modulus of Resilience), kJ/m3 130
260
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 22
24
Strength to Weight: Bending, points 20
22
Thermal Diffusivity, mm2/s 4.2
4.0
Thermal Shock Resistance, points 14
15

Alloy Composition

Carbon (C), % 0.040 to 0.1
0 to 0.030
Chromium (Cr), % 17 to 19
16.5 to 18.5
Iron (Fe), % 64.6 to 73.6
63.2 to 71.4
Manganese (Mn), % 0 to 2.0
0 to 2.0
Molybdenum (Mo), % 0
2.0 to 2.5
Nickel (Ni), % 9.0 to 12
10 to 12.5
Niobium (Nb), % 0.4 to 1.2
0
Nitrogen (N), % 0
0.12 to 0.22
Phosphorus (P), % 0 to 0.045
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.015