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EN 1.4003 Stainless Steel vs. EN 1.4318 Stainless Steel

Both EN 1.4003 stainless steel and EN 1.4318 stainless steel are iron alloys. They have 87% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4003 stainless steel and the bottom bar is EN 1.4318 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
230
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 22
44
Fatigue Strength, MPa 210
340
Impact Strength: V-Notched Charpy, J 67
85
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
77
Shear Strength, MPa 340
520
Tensile Strength: Ultimate (UTS), MPa 540
740
Tensile Strength: Yield (Proof), MPa 320
380

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Maximum Temperature: Corrosion, °C 390
410
Maximum Temperature: Mechanical, °C 720
910
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1400
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
15
Thermal Expansion, µm/m-K 10
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
13
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.9
2.8
Embodied Energy, MJ/kg 27
39
Embodied Water, L/kg 97
130

Common Calculations

PREN (Pitting Resistance) 12
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
280
Resilience: Unit (Modulus of Resilience), kJ/m3 260
360
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
27
Strength to Weight: Bending, points 19
23
Thermal Diffusivity, mm2/s 6.7
4.0
Thermal Shock Resistance, points 19
17

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.030
Chromium (Cr), % 10.5 to 12.5
16.5 to 18.5
Iron (Fe), % 83.9 to 89.2
70.2 to 77.4
Manganese (Mn), % 0 to 1.5
0 to 2.0
Nickel (Ni), % 0.3 to 1.0
6.0 to 8.0
Nitrogen (N), % 0 to 0.030
0.1 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.015