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EN 1.4951 Stainless Steel vs. EN 1.4434 Stainless Steel

Both EN 1.4951 stainless steel and EN 1.4434 stainless steel are iron alloys. Both are furnished in the solution annealed (AT) condition. They have 85% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4951 stainless steel and the bottom bar is EN 1.4434 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
200
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 38
41
Fatigue Strength, MPa 190
270
Impact Strength: V-Notched Charpy, J 98
90
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 79
79
Shear Strength, MPa 430
450
Tensile Strength: Ultimate (UTS), MPa 630
660
Tensile Strength: Yield (Proof), MPa 220
310

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 450
420
Maximum Temperature: Mechanical, °C 1100
980
Melting Completion (Liquidus), °C 1410
1450
Melting Onset (Solidus), °C 1360
1400
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 16
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 25
21
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 4.3
4.2
Embodied Energy, MJ/kg 61
57
Embodied Water, L/kg 190
160

Common Calculations

PREN (Pitting Resistance) 26
32
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
220
Resilience: Unit (Modulus of Resilience), kJ/m3 130
240
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 22
23
Strength to Weight: Bending, points 21
21
Thermal Diffusivity, mm2/s 3.9
4.0
Thermal Shock Resistance, points 14
15

Alloy Composition

Carbon (C), % 0.040 to 0.080
0 to 0.030
Chromium (Cr), % 24 to 26
16.5 to 19.5
Iron (Fe), % 49.1 to 57
59.2 to 69.9
Manganese (Mn), % 0 to 2.0
0 to 2.0
Molybdenum (Mo), % 0
3.0 to 4.0
Nickel (Ni), % 19 to 22
10.5 to 14
Nitrogen (N), % 0 to 0.1
0.1 to 0.2
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 0 to 0.7
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.015