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EN 1.4903 Stainless Steel vs. EN 1.4905 Stainless Steel

Both EN 1.4903 stainless steel and EN 1.4905 stainless steel are iron alloys. They have a very high 99% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4903 stainless steel and the bottom bar is EN 1.4905 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20 to 21
19
Fatigue Strength, MPa 320 to 330
330
Impact Strength: V-Notched Charpy, J 42 to 46
38
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
76
Shear Strength, MPa 420
460
Tensile Strength: Ultimate (UTS), MPa 670 to 680
740
Tensile Strength: Yield (Proof), MPa 500
510

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Maximum Temperature: Corrosion, °C 380
380
Maximum Temperature: Mechanical, °C 650
660
Melting Completion (Liquidus), °C 1460
1480
Melting Onset (Solidus), °C 1420
1440
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 26
26
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.4
3.7
Electrical Conductivity: Equal Weight (Specific), % IACS 4.0
4.2

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
9.5
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.6
2.8
Embodied Energy, MJ/kg 36
40
Embodied Water, L/kg 88
90

Common Calculations

PREN (Pitting Resistance) 13
15
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 130
130
Resilience: Unit (Modulus of Resilience), kJ/m3 650
680
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24
26
Strength to Weight: Bending, points 22
23
Thermal Diffusivity, mm2/s 7.0
7.0
Thermal Shock Resistance, points 23
25

Alloy Composition

Aluminum (Al), % 0 to 0.040
0 to 0.040
Boron (B), % 0
0.00050 to 0.0050
Carbon (C), % 0.080 to 0.12
0.090 to 0.13
Chromium (Cr), % 8.0 to 9.5
8.5 to 9.5
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 87.1 to 90.5
86.2 to 88.8
Manganese (Mn), % 0.3 to 0.6
0.3 to 0.6
Molybdenum (Mo), % 0.85 to 1.1
0.9 to 1.1
Nickel (Ni), % 0 to 0.4
0.1 to 0.4
Niobium (Nb), % 0.060 to 0.1
0.060 to 0.1
Nitrogen (N), % 0.030 to 0.070
0.050 to 0.090
Phosphorus (P), % 0 to 0.025
0 to 0.020
Silicon (Si), % 0 to 0.5
0.1 to 0.5
Sulfur (S), % 0 to 0.015
0 to 0.010
Tungsten (W), % 0
0.9 to 1.1
Vanadium (V), % 0.18 to 0.25
0.18 to 0.25