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EN 1.4971 Stainless Steel vs. SAE-AISI 4340 Steel

Both EN 1.4971 stainless steel and SAE-AISI 4340 steel are iron alloys. They have a modest 35% of their average alloy composition in common, which, by itself, doesn't mean much. There are 29 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is EN 1.4971 stainless steel and the bottom bar is SAE-AISI 4340 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
210 to 360
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
12 to 22
Fatigue Strength, MPa 270
330 to 740
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
73
Shear Strength, MPa 530
430 to 770
Tensile Strength: Ultimate (UTS), MPa 800
690 to 1280
Tensile Strength: Yield (Proof), MPa 340
470 to 1150

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1100
430
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
44
Thermal Expansion, µm/m-K 15
13

Otherwise Unclassified Properties

Base Metal Price, % relative 70
3.5
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 7.6
1.7
Embodied Energy, MJ/kg 110
22
Embodied Water, L/kg 300
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
79 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 280
590 to 3490
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26
24 to 45
Strength to Weight: Bending, points 23
22 to 33
Thermal Diffusivity, mm2/s 3.4
12
Thermal Shock Resistance, points 19
20 to 38

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.38 to 0.43
Chromium (Cr), % 20 to 22.5
0.7 to 0.9
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 37.1
95.1 to 96.3
Manganese (Mn), % 0 to 2.0
0.6 to 0.8
Molybdenum (Mo), % 2.5 to 3.5
0.2 to 0.3
Nickel (Ni), % 19 to 21
1.7 to 2.0
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0.1 to 0.2
0
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.015
0 to 0.040
Tungsten (W), % 2.0 to 3.0
0