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AISI 205 Stainless Steel vs. SAE-AISI 4340M Steel

Both AISI 205 stainless steel and SAE-AISI 4340M steel are iron alloys. They have 69% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is AISI 205 stainless steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 440
710
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 11 to 51
6.0
Fatigue Strength, MPa 410 to 640
690
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
72
Shear Strength, MPa 560 to 850
1360
Tensile Strength: Ultimate (UTS), MPa 800 to 1430
2340
Tensile Strength: Yield (Proof), MPa 450 to 1100
1240

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Mechanical, °C 880
430
Melting Completion (Liquidus), °C 1380
1440
Melting Onset (Solidus), °C 1340
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Expansion, µm/m-K 18
13

Otherwise Unclassified Properties

Base Metal Price, % relative 11
3.9
Density, g/cm3 7.6
7.8
Embodied Carbon, kg CO2/kg material 2.6
1.9
Embodied Energy, MJ/kg 37
26
Embodied Water, L/kg 150
55

Common Calculations

PREN (Pitting Resistance) 23
2.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 150 to 430
120
Resilience: Unit (Modulus of Resilience), kJ/m3 510 to 3060
4120
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 29 to 52
84
Strength to Weight: Bending, points 25 to 37
51
Thermal Shock Resistance, points 16 to 29
70

Alloy Composition

Carbon (C), % 0.12 to 0.25
0.38 to 0.43
Chromium (Cr), % 16.5 to 18.5
0.7 to 1.0
Iron (Fe), % 62.6 to 68.1
93.3 to 94.8
Manganese (Mn), % 14 to 15.5
0.65 to 0.9
Molybdenum (Mo), % 0
0.35 to 0.45
Nickel (Ni), % 1.0 to 1.7
1.7 to 2.0
Nitrogen (N), % 0.32 to 0.4
0
Phosphorus (P), % 0 to 0.060
0 to 0.012
Silicon (Si), % 0 to 1.0
1.5 to 1.8
Sulfur (S), % 0 to 0.030
0 to 0.012
Vanadium (V), % 0
0.050 to 0.1