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SAE-AISI 4340M Steel vs. S21603 Stainless Steel

Both SAE-AISI 4340M steel and S21603 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 67% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340M steel and the bottom bar is S21603 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
200
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
45
Fatigue Strength, MPa 690
360
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
79
Shear Strength, MPa 1360
490
Tensile Strength: Ultimate (UTS), MPa 2340
690
Tensile Strength: Yield (Proof), MPa 1240
390

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Mechanical, °C 430
990
Melting Completion (Liquidus), °C 1440
1420
Melting Onset (Solidus), °C 1400
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Expansion, µm/m-K 13
17

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
17
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.9
3.6
Embodied Energy, MJ/kg 26
50
Embodied Water, L/kg 55
160

Common Calculations

PREN (Pitting Resistance) 2.2
34
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
270
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
380
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
25
Strength to Weight: Bending, points 51
22
Thermal Shock Resistance, points 70
15

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.030
Chromium (Cr), % 0.7 to 1.0
17.5 to 22
Iron (Fe), % 93.3 to 94.8
57.6 to 67.8
Manganese (Mn), % 0.65 to 0.9
7.5 to 9.0
Molybdenum (Mo), % 0.35 to 0.45
2.0 to 3.0
Nickel (Ni), % 1.7 to 2.0
5.0 to 7.0
Nitrogen (N), % 0
0.25 to 0.5
Phosphorus (P), % 0 to 0.012
0 to 0.045
Silicon (Si), % 1.5 to 1.8
0 to 0.75
Sulfur (S), % 0 to 0.012
0 to 0.030
Vanadium (V), % 0.050 to 0.1
0