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SAE-AISI 4340 Steel vs. S44700 Stainless Steel

Both SAE-AISI 4340 steel and S44700 stainless steel are iron alloys. They have 68% of their average alloy composition in common. There are 27 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 SAE-AISI 4340 steel and the bottom bar is S44700 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 360
200
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 12 to 22
23
Fatigue Strength, MPa 330 to 740
300
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 73
82
Shear Strength, MPa 430 to 770
380
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
600
Tensile Strength: Yield (Proof), MPa 470 to 1150
450

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 430
1100
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Expansion, µm/m-K 13
11

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
18
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
3.6
Embodied Energy, MJ/kg 22
49
Embodied Water, L/kg 53
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
120
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
480
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 45
21
Strength to Weight: Bending, points 22 to 33
20
Thermal Shock Resistance, points 20 to 38
19

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.010
Chromium (Cr), % 0.7 to 0.9
28 to 30
Copper (Cu), % 0
0 to 0.15
Iron (Fe), % 95.1 to 96.3
64.9 to 68.5
Manganese (Mn), % 0.6 to 0.8
0 to 0.3
Molybdenum (Mo), % 0.2 to 0.3
3.5 to 4.2
Nickel (Ni), % 1.7 to 2.0
0 to 0.15
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0 to 0.2
Sulfur (S), % 0 to 0.040
0 to 0.020