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AISI 201 Stainless Steel vs. SAE-AISI 4340M Steel

Both AISI 201 stainless steel and SAE-AISI 4340M steel are iron alloys. They have 75% of their average alloy composition in common. There are 32 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 AISI 201 stainless steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 440
710
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 4.6 to 51
6.0
Fatigue Strength, MPa 280 to 600
690
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
72
Shear Strength, MPa 450 to 840
1360
Tensile Strength: Ultimate (UTS), MPa 650 to 1450
2340
Tensile Strength: Yield (Proof), MPa 300 to 1080
1240

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Mechanical, °C 880
430
Melting Completion (Liquidus), °C 1410
1440
Melting Onset (Solidus), °C 1370
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
38
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 12
3.9
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.6
1.9
Embodied Energy, MJ/kg 38
26
Embodied Water, L/kg 140
55

Common Calculations

PREN (Pitting Resistance) 19
2.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 61 to 340
120
Resilience: Unit (Modulus of Resilience), kJ/m3 230 to 2970
4120
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 23 to 52
84
Strength to Weight: Bending, points 22 to 37
51
Thermal Diffusivity, mm2/s 4.0
10
Thermal Shock Resistance, points 14 to 32
70

Alloy Composition

Carbon (C), % 0 to 0.15
0.38 to 0.43
Chromium (Cr), % 16 to 18
0.7 to 1.0
Iron (Fe), % 67.5 to 75
93.3 to 94.8
Manganese (Mn), % 5.5 to 7.5
0.65 to 0.9
Molybdenum (Mo), % 0
0.35 to 0.45
Nickel (Ni), % 3.5 to 5.5
1.7 to 2.0
Nitrogen (N), % 0 to 0.25
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