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S31254 Stainless Steel vs. AISI 321H Stainless Steel

Both S31254 stainless steel and AISI 321H stainless steel are iron alloys. Both are furnished in the annealed condition. They have 83% of their average alloy composition in common.

For each property being compared, the top bar is S31254 stainless steel and the bottom bar is AISI 321H stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
40
Fatigue Strength, MPa 290
200
Poisson's Ratio 0.28
0.28
Reduction in Area, % 56
51
Rockwell B Hardness 84
82
Shear Modulus, GPa 80
77
Shear Strength, MPa 490
400
Tensile Strength: Ultimate (UTS), MPa 720
580
Tensile Strength: Yield (Proof), MPa 330
230

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 420
480
Maximum Temperature: Mechanical, °C 1090
940
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 460
480
Thermal Conductivity, W/m-K 14
15
Thermal Expansion, µm/m-K 17
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 28
16
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 5.5
3.2
Embodied Energy, MJ/kg 74
46
Embodied Water, L/kg 190
140

Common Calculations

PREN (Pitting Resistance) 44
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
190
Resilience: Unit (Modulus of Resilience), kJ/m3 270
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 25
21
Strength to Weight: Bending, points 22
20
Thermal Diffusivity, mm2/s 3.8
4.0
Thermal Shock Resistance, points 15
12

Alloy Composition

Carbon (C), % 0 to 0.020
0.040 to 0.1
Chromium (Cr), % 19.5 to 20.5
17 to 19
Copper (Cu), % 0.5 to 1.0
0
Iron (Fe), % 51.4 to 56.3
65.4 to 74
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 6.0 to 6.5
0
Nickel (Ni), % 17.5 to 18.5
9.0 to 12
Nitrogen (N), % 0.18 to 0.22
0
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0 to 0.8
0 to 0.75
Sulfur (S), % 0 to 0.010
0 to 0.030
Titanium (Ti), % 0
0 to 0.7