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EN 1.4109 Stainless Steel vs. EN 1.4945 Stainless Steel

Both EN 1.4109 stainless steel and EN 1.4945 stainless steel are iron alloys. They have 78% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4109 stainless steel and the bottom bar is EN 1.4945 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
200 to 220
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 19
19 to 34
Fatigue Strength, MPa 270
230 to 350
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
77
Shear Strength, MPa 480
430 to 460
Tensile Strength: Ultimate (UTS), MPa 770
640 to 740
Tensile Strength: Yield (Proof), MPa 420
290 to 550

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 390
520
Maximum Temperature: Mechanical, °C 820
920
Melting Completion (Liquidus), °C 1440
1490
Melting Onset (Solidus), °C 1400
1440
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 30
14
Thermal Expansion, µm/m-K 10
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.7
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
3.2

Otherwise Unclassified Properties

Base Metal Price, % relative 8.5
30
Density, g/cm3 7.7
8.1
Embodied Carbon, kg CO2/kg material 2.2
5.0
Embodied Energy, MJ/kg 30
73
Embodied Water, L/kg 110
150

Common Calculations

PREN (Pitting Resistance) 17
23
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
130 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 460
210 to 760
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 28
22 to 25
Strength to Weight: Bending, points 24
20 to 22
Thermal Diffusivity, mm2/s 8.1
3.7
Thermal Shock Resistance, points 28
14 to 16

Alloy Composition

Carbon (C), % 0.6 to 0.75
0.040 to 0.1
Chromium (Cr), % 14 to 16
15.5 to 17.5
Iron (Fe), % 80.7 to 85
57.9 to 65.7
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 0.4 to 0.8
0
Nickel (Ni), % 0
15.5 to 17.5
Niobium (Nb), % 0
0.4 to 1.2
Nitrogen (N), % 0
0.060 to 0.14
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 0.7
0.3 to 0.6
Sulfur (S), % 0 to 0.015
0 to 0.015
Tungsten (W), % 0
2.5 to 3.5