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S44700 Stainless Steel vs. SAE-AISI 4145 Steel

Both S44700 stainless steel and SAE-AISI 4145 steel are iron alloys. Both are furnished in the annealed condition. They have 68% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is S44700 stainless steel and the bottom bar is SAE-AISI 4145 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
310
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 23
16
Fatigue Strength, MPa 300
240
Poisson's Ratio 0.27
0.29
Reduction in Area, % 45
46
Rockwell C Hardness 17
33
Shear Modulus, GPa 82
73
Shear Strength, MPa 380
360
Tensile Strength: Ultimate (UTS), MPa 600
580
Tensile Strength: Yield (Proof), MPa 450
360

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1100
420
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Base Metal Price, % relative 18
2.4
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.6
1.5
Embodied Energy, MJ/kg 49
20
Embodied Water, L/kg 180
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
80
Resilience: Unit (Modulus of Resilience), kJ/m3 480
350
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21
21
Strength to Weight: Bending, points 20
20
Thermal Shock Resistance, points 19
17

Alloy Composition

Carbon (C), % 0 to 0.010
0.43 to 0.48
Chromium (Cr), % 28 to 30
0.8 to 1.1
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 64.9 to 68.5
96.7 to 97.7
Manganese (Mn), % 0 to 0.3
0.75 to 1.0
Molybdenum (Mo), % 3.5 to 4.2
0.15 to 0.25
Nickel (Ni), % 0 to 0.15
0
Nitrogen (N), % 0 to 0.020
0
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 0 to 0.2
0.15 to 0.35
Sulfur (S), % 0 to 0.020
0 to 0.040