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S44725 Stainless Steel vs. S20431 Stainless Steel

Both S44725 stainless steel and S20431 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 88% of their average alloy composition in common.

For each property being compared, the top bar is S44725 stainless steel and the bottom bar is S20431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
210
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 22
46
Fatigue Strength, MPa 210
320
Poisson's Ratio 0.27
0.28
Rockwell B Hardness 84
86
Shear Modulus, GPa 81
76
Shear Strength, MPa 320
500
Tensile Strength: Ultimate (UTS), MPa 500
710
Tensile Strength: Yield (Proof), MPa 310
350

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Maximum Temperature: Corrosion, °C 500
410
Maximum Temperature: Mechanical, °C 1100
890
Melting Completion (Liquidus), °C 1450
1400
Melting Onset (Solidus), °C 1410
1360
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 17
15
Thermal Expansion, µm/m-K 11
17

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 15
12
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 3.1
2.5
Embodied Energy, MJ/kg 44
36
Embodied Water, L/kg 170
140

Common Calculations

PREN (Pitting Resistance) 33
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 99
270
Resilience: Unit (Modulus of Resilience), kJ/m3 240
310
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
25
Strength to Weight: Bending, points 18
23
Thermal Diffusivity, mm2/s 4.6
4.0
Thermal Shock Resistance, points 16
15

Alloy Composition

Carbon (C), % 0 to 0.015
0 to 0.12
Chromium (Cr), % 25 to 28.5
17 to 18
Copper (Cu), % 0
1.5 to 3.5
Iron (Fe), % 67.6 to 73.5
66.1 to 74.4
Manganese (Mn), % 0 to 0.4
5.0 to 7.0
Molybdenum (Mo), % 1.5 to 2.5
0
Nickel (Ni), % 0 to 0.3
2.0 to 4.0
Niobium (Nb), % 0 to 0.26
0
Nitrogen (N), % 0 to 0.018
0.1 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.045
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