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S40920 Stainless Steel vs. S44725 Stainless Steel

Both S40920 stainless steel and S44725 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 82% of their average alloy composition in common.

For each property being compared, the top bar is S40920 stainless steel and the bottom bar is S44725 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
180
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 22
22
Fatigue Strength, MPa 130
210
Poisson's Ratio 0.28
0.27
Rockwell B Hardness 77
84
Shear Modulus, GPa 75
81
Shear Strength, MPa 270
320
Tensile Strength: Ultimate (UTS), MPa 430
500
Tensile Strength: Yield (Proof), MPa 190
310

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Maximum Temperature: Corrosion, °C 450
500
Maximum Temperature: Mechanical, °C 710
1100
Melting Completion (Liquidus), °C 1450
1450
Melting Onset (Solidus), °C 1400
1410
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 26
17
Thermal Expansion, µm/m-K 10
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
15
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.0
3.1
Embodied Energy, MJ/kg 28
44
Embodied Water, L/kg 94
170

Common Calculations

PREN (Pitting Resistance) 11
33
Resilience: Ultimate (Unit Rupture Work), MJ/m3 78
99
Resilience: Unit (Modulus of Resilience), kJ/m3 97
240
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 15
18
Strength to Weight: Bending, points 16
18
Thermal Diffusivity, mm2/s 6.9
4.6
Thermal Shock Resistance, points 15
16

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.015
Chromium (Cr), % 10.5 to 11.7
25 to 28.5
Iron (Fe), % 85.1 to 89.4
67.6 to 73.5
Manganese (Mn), % 0 to 1.0
0 to 0.4
Molybdenum (Mo), % 0
1.5 to 2.5
Nickel (Ni), % 0 to 0.5
0 to 0.3
Niobium (Nb), % 0 to 0.1
0 to 0.26
Nitrogen (N), % 0 to 0.030
0 to 0.018
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.040
Sulfur (S), % 0 to 0.020
0 to 0.020
Titanium (Ti), % 0.15 to 0.5
0 to 0.26