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EN 1.4945 Stainless Steel vs. EN 1.4640 Stainless Steel

Both EN 1.4945 stainless steel and EN 1.4640 stainless steel are iron alloys. They have 86% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4945 stainless steel and the bottom bar is EN 1.4640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 220
190 to 200
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 19 to 34
51
Fatigue Strength, MPa 230 to 350
230 to 250
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 430 to 460
440 to 460
Tensile Strength: Ultimate (UTS), MPa 640 to 740
620 to 650
Tensile Strength: Yield (Proof), MPa 290 to 550
240 to 260

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Maximum Temperature: Corrosion, °C 520
420
Maximum Temperature: Mechanical, °C 920
930
Melting Completion (Liquidus), °C 1490
1420
Melting Onset (Solidus), °C 1440
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 14
15
Thermal Expansion, µm/m-K 17
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.2
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 30
14
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 5.0
2.8
Embodied Energy, MJ/kg 73
40
Embodied Water, L/kg 150
150

Common Calculations

PREN (Pitting Resistance) 23
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130 to 180
250 to 260
Resilience: Unit (Modulus of Resilience), kJ/m3 210 to 760
150 to 170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 22 to 25
22 to 23
Strength to Weight: Bending, points 20 to 22
21
Thermal Diffusivity, mm2/s 3.7
4.0
Thermal Shock Resistance, points 14 to 16
14 to 15

Alloy Composition

Carbon (C), % 0.040 to 0.1
0.030 to 0.080
Chromium (Cr), % 15.5 to 17.5
18 to 19
Copper (Cu), % 0
1.3 to 2.0
Iron (Fe), % 57.9 to 65.7
67.4 to 73.6
Manganese (Mn), % 0 to 1.5
1.5 to 4.0
Nickel (Ni), % 15.5 to 17.5
5.5 to 6.9
Niobium (Nb), % 0.4 to 1.2
0
Nitrogen (N), % 0.060 to 0.14
0.030 to 0.11
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 0.3 to 0.6
0 to 0.5
Sulfur (S), % 0 to 0.015
0 to 0.015
Tungsten (W), % 2.5 to 3.5
0