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S31727 Stainless Steel vs. AISI 440A Stainless Steel

Both S31727 stainless steel and AISI 440A stainless steel are iron alloys. They have 76% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is S31727 stainless steel and the bottom bar is AISI 440A stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
5.0 to 20
Fatigue Strength, MPa 240
270 to 790
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
77
Shear Strength, MPa 430
450 to 1040
Tensile Strength: Ultimate (UTS), MPa 630
730 to 1790
Tensile Strength: Yield (Proof), MPa 270
420 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Maximum Temperature: Corrosion, °C 420
400
Maximum Temperature: Mechanical, °C 1010
760
Melting Completion (Liquidus), °C 1440
1480
Melting Onset (Solidus), °C 1390
1370
Specific Heat Capacity, J/kg-K 470
480
Thermal Expansion, µm/m-K 16
10

Otherwise Unclassified Properties

Base Metal Price, % relative 24
9.0
Density, g/cm3 8.0
7.7
Embodied Carbon, kg CO2/kg material 4.7
2.2
Embodied Energy, MJ/kg 64
31
Embodied Water, L/kg 180
120

Common Calculations

PREN (Pitting Resistance) 35
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
87 to 120
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 22
26 to 65
Strength to Weight: Bending, points 20
23 to 43
Thermal Shock Resistance, points 14
26 to 65

Alloy Composition

Carbon (C), % 0 to 0.030
0.6 to 0.75
Chromium (Cr), % 17.5 to 19
16 to 18
Copper (Cu), % 2.8 to 4.0
0
Iron (Fe), % 53.7 to 61.3
78.4 to 83.4
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 3.8 to 4.5
0 to 0.75
Nickel (Ni), % 14.5 to 16.5
0
Nitrogen (N), % 0.15 to 0.21
0
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 0.015