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S21640 Stainless Steel vs. EN 1.4150 Stainless Steel

Both S21640 stainless steel and EN 1.4150 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 86% of their average alloy composition in common.

For each property being compared, the top bar is S21640 stainless steel and the bottom bar is EN 1.4150 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
220
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 46
20
Fatigue Strength, MPa 320
270
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
76
Shear Strength, MPa 520
460
Tensile Strength: Ultimate (UTS), MPa 740
730
Tensile Strength: Yield (Proof), MPa 350
430

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 490
390
Maximum Temperature: Mechanical, °C 940
840
Melting Completion (Liquidus), °C 1430
1420
Melting Onset (Solidus), °C 1380
1380
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 15
23
Thermal Expansion, µm/m-K 17
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 17
8.5
Density, g/cm3 7.7
7.6
Embodied Carbon, kg CO2/kg material 3.6
2.8
Embodied Energy, MJ/kg 51
42
Embodied Water, L/kg 150
120

Common Calculations

PREN (Pitting Resistance) 26
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 280
120
Resilience: Unit (Modulus of Resilience), kJ/m3 300
470
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 27
27
Strength to Weight: Bending, points 23
24
Thermal Diffusivity, mm2/s 4.0
6.2
Thermal Shock Resistance, points 16
27

Alloy Composition

Carbon (C), % 0 to 0.080
0.45 to 0.6
Chromium (Cr), % 17.5 to 19.5
15 to 16.5
Iron (Fe), % 63 to 74.3
79 to 82.8
Manganese (Mn), % 3.5 to 6.5
0 to 0.8
Molybdenum (Mo), % 0.5 to 2.0
0.2 to 0.4
Nickel (Ni), % 4.0 to 6.5
0 to 0.4
Niobium (Nb), % 0.1 to 1.0
0
Nitrogen (N), % 0.080 to 0.3
0.050 to 0.2
Phosphorus (P), % 0 to 0.060
0 to 0.030
Silicon (Si), % 0 to 1.0
1.3 to 1.7
Sulfur (S), % 0 to 0.030
0 to 0.010
Vanadium (V), % 0
0.2 to 0.4