MakeItFrom.com
Menu (ESC)

SAE-AISI 4340M Steel vs. S44725 Stainless Steel

Both SAE-AISI 4340M steel and S44725 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 72% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340M steel and the bottom bar is S44725 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
180
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
22
Fatigue Strength, MPa 690
210
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 72
81
Shear Strength, MPa 1360
320
Tensile Strength: Ultimate (UTS), MPa 2340
500
Tensile Strength: Yield (Proof), MPa 1240
310

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Mechanical, °C 430
1100
Melting Completion (Liquidus), °C 1440
1450
Melting Onset (Solidus), °C 1400
1410
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 38
17
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
15
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.9
3.1
Embodied Energy, MJ/kg 26
44
Embodied Water, L/kg 55
170

Common Calculations

PREN (Pitting Resistance) 2.2
33
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
99
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
240
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
18
Strength to Weight: Bending, points 51
18
Thermal Diffusivity, mm2/s 10
4.6
Thermal Shock Resistance, points 70
16

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.015
Chromium (Cr), % 0.7 to 1.0
25 to 28.5
Iron (Fe), % 93.3 to 94.8
67.6 to 73.5
Manganese (Mn), % 0.65 to 0.9
0 to 0.4
Molybdenum (Mo), % 0.35 to 0.45
1.5 to 2.5
Nickel (Ni), % 1.7 to 2.0
0 to 0.3
Niobium (Nb), % 0
0 to 0.26
Nitrogen (N), % 0
0 to 0.018
Phosphorus (P), % 0 to 0.012
0 to 0.040
Silicon (Si), % 1.5 to 1.8
0 to 0.040
Sulfur (S), % 0 to 0.012
0 to 0.020
Titanium (Ti), % 0
0 to 0.26
Vanadium (V), % 0.050 to 0.1
0