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S44725 Stainless Steel vs. AISI 444 Stainless Steel

Both S44725 stainless steel and AISI 444 stainless steel are iron alloys. Both are furnished in the annealed condition. They have a moderately high 92% of their average alloy composition in common.

For each property being compared, the top bar is S44725 stainless steel and the bottom bar is AISI 444 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 22
23
Fatigue Strength, MPa 210
210
Poisson's Ratio 0.27
0.28
Rockwell B Hardness 84
83
Shear Modulus, GPa 81
78
Shear Strength, MPa 320
300
Tensile Strength: Ultimate (UTS), MPa 500
470
Tensile Strength: Yield (Proof), MPa 310
310

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 500
580
Maximum Temperature: Mechanical, °C 1100
930
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 17
23
Thermal Expansion, µm/m-K 11
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 15
15
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 3.1
3.4
Embodied Energy, MJ/kg 44
47
Embodied Water, L/kg 170
130

Common Calculations

PREN (Pitting Resistance) 33
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 99
95
Resilience: Unit (Modulus of Resilience), kJ/m3 240
240
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
17
Strength to Weight: Bending, points 18
17
Thermal Diffusivity, mm2/s 4.6
6.2
Thermal Shock Resistance, points 16
16

Alloy Composition

Carbon (C), % 0 to 0.015
0 to 0.025
Chromium (Cr), % 25 to 28.5
17.5 to 19.5
Iron (Fe), % 67.6 to 73.5
73.3 to 80.8
Manganese (Mn), % 0 to 0.4
0 to 1.0
Molybdenum (Mo), % 1.5 to 2.5
1.8 to 2.5
Nickel (Ni), % 0 to 0.3
0 to 1.0
Niobium (Nb), % 0 to 0.26
0.2 to 0.8
Nitrogen (N), % 0 to 0.018
0 to 0.035
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.040
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.030
Titanium (Ti), % 0 to 0.26
0.2 to 0.8