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S21800 Stainless Steel vs. S44725 Stainless Steel

Both S21800 stainless steel and S44725 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 80% of their average alloy composition in common. There are 30 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 S21800 stainless steel and the bottom bar is S44725 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
180
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 40
22
Fatigue Strength, MPa 330
210
Poisson's Ratio 0.28
0.27
Rockwell B Hardness 88
84
Shear Modulus, GPa 75
81
Shear Strength, MPa 510
320
Tensile Strength: Ultimate (UTS), MPa 740
500
Tensile Strength: Yield (Proof), MPa 390
310

Thermal Properties

Latent Heat of Fusion, J/g 340
290
Maximum Temperature: Corrosion, °C 410
500
Maximum Temperature: Mechanical, °C 900
1100
Melting Completion (Liquidus), °C 1360
1450
Melting Onset (Solidus), °C 1310
1410
Specific Heat Capacity, J/kg-K 500
480
Thermal Expansion, µm/m-K 16
11

Otherwise Unclassified Properties

Base Metal Price, % relative 15
15
Density, g/cm3 7.5
7.7
Embodied Carbon, kg CO2/kg material 3.1
3.1
Embodied Energy, MJ/kg 45
44
Embodied Water, L/kg 150
170

Common Calculations

PREN (Pitting Resistance) 19
33
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
99
Resilience: Unit (Modulus of Resilience), kJ/m3 390
240
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 27
18
Strength to Weight: Bending, points 24
18
Thermal Shock Resistance, points 17
16

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.015
Chromium (Cr), % 16 to 18
25 to 28.5
Iron (Fe), % 59.1 to 65.4
67.6 to 73.5
Manganese (Mn), % 7.0 to 9.0
0 to 0.4
Molybdenum (Mo), % 0
1.5 to 2.5
Nickel (Ni), % 8.0 to 9.0
0 to 0.3
Niobium (Nb), % 0
0 to 0.26
Nitrogen (N), % 0.080 to 0.18
0 to 0.018
Phosphorus (P), % 0 to 0.060
0 to 0.040
Silicon (Si), % 3.5 to 4.5
0 to 0.040
Sulfur (S), % 0 to 0.030
0 to 0.020
Titanium (Ti), % 0
0 to 0.26