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S31727 Stainless Steel vs. AISI 444 Stainless Steel

Both S31727 stainless steel and AISI 444 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 79% 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 S31727 stainless steel and the bottom bar is AISI 444 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
23
Fatigue Strength, MPa 240
210
Poisson's Ratio 0.28
0.28
Rockwell B Hardness 83
83
Shear Modulus, GPa 78
78
Shear Strength, MPa 430
300
Tensile Strength: Ultimate (UTS), MPa 630
470
Tensile Strength: Yield (Proof), MPa 270
310

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 420
580
Maximum Temperature: Mechanical, °C 1010
930
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1390
1420
Specific Heat Capacity, J/kg-K 470
480
Thermal Expansion, µm/m-K 16
10

Otherwise Unclassified Properties

Base Metal Price, % relative 24
15
Density, g/cm3 8.0
7.7
Embodied Carbon, kg CO2/kg material 4.7
3.4
Embodied Energy, MJ/kg 64
47
Embodied Water, L/kg 180
130

Common Calculations

PREN (Pitting Resistance) 35
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
95
Resilience: Unit (Modulus of Resilience), kJ/m3 190
240
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 22
17
Strength to Weight: Bending, points 20
17
Thermal Shock Resistance, points 14
16

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.025
Chromium (Cr), % 17.5 to 19
17.5 to 19.5
Copper (Cu), % 2.8 to 4.0
0
Iron (Fe), % 53.7 to 61.3
73.3 to 80.8
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 3.8 to 4.5
1.8 to 2.5
Nickel (Ni), % 14.5 to 16.5
0 to 1.0
Niobium (Nb), % 0
0.2 to 0.8
Nitrogen (N), % 0.15 to 0.21
0 to 0.035
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0.2 to 0.8