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S82121 Stainless Steel vs. S44725 Stainless Steel

Both S82121 stainless steel and S44725 stainless steel are iron alloys. Both are furnished in the annealed condition. They have a moderately high 94% of their average alloy composition in common. There are 33 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is S82121 stainless steel and the bottom bar is S44725 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
180
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 28
22
Fatigue Strength, MPa 370
210
Poisson's Ratio 0.27
0.27
Shear Modulus, GPa 78
81
Shear Strength, MPa 470
320
Tensile Strength: Ultimate (UTS), MPa 730
500
Tensile Strength: Yield (Proof), MPa 510
310

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 430
500
Maximum Temperature: Mechanical, °C 1020
1100
Melting Completion (Liquidus), °C 1430
1450
Melting Onset (Solidus), °C 1380
1410
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
17
Thermal Expansion, µm/m-K 13
11

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 14
15
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.8
3.1
Embodied Energy, MJ/kg 40
44
Embodied Water, L/kg 150
170

Common Calculations

PREN (Pitting Resistance) 28
33
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
99
Resilience: Unit (Modulus of Resilience), kJ/m3 660
240
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 26
18
Strength to Weight: Bending, points 23
18
Thermal Diffusivity, mm2/s 4.0
4.6
Thermal Shock Resistance, points 20
16

Alloy Composition

Carbon (C), % 0 to 0.035
0 to 0.015
Chromium (Cr), % 21 to 23
25 to 28.5
Copper (Cu), % 0.2 to 1.2
0
Iron (Fe), % 66.7 to 75.4
67.6 to 73.5
Manganese (Mn), % 1.0 to 2.5
0 to 0.4
Molybdenum (Mo), % 0.3 to 1.3
1.5 to 2.5
Nickel (Ni), % 2.0 to 4.0
0 to 0.3
Niobium (Nb), % 0
0 to 0.26
Nitrogen (N), % 0.15 to 0.25
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 0.010
0 to 0.020
Titanium (Ti), % 0
0 to 0.26