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ASTM A387 Grade 21L Class 1 vs. S31254 Stainless Steel

Both ASTM A387 grade 21L class 1 and S31254 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 59% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 21L class 1 and the bottom bar is S31254 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21
40
Fatigue Strength, MPa 160
290
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
80
Shear Strength, MPa 310
490
Tensile Strength: Ultimate (UTS), MPa 500
720
Tensile Strength: Yield (Proof), MPa 230
330

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Maximum Temperature: Mechanical, °C 480
1090
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 470
460
Thermal Conductivity, W/m-K 41
14
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
28
Density, g/cm3 7.9
8.0
Embodied Carbon, kg CO2/kg material 1.8
5.5
Embodied Energy, MJ/kg 23
74
Embodied Water, L/kg 62
190

Common Calculations

PREN (Pitting Resistance) 6.4
44
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84
240
Resilience: Unit (Modulus of Resilience), kJ/m3 140
270
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18
25
Strength to Weight: Bending, points 18
22
Thermal Diffusivity, mm2/s 11
3.8
Thermal Shock Resistance, points 14
15

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.020
Chromium (Cr), % 2.8 to 3.3
19.5 to 20.5
Copper (Cu), % 0
0.5 to 1.0
Iron (Fe), % 94.4 to 96.1
51.4 to 56.3
Manganese (Mn), % 0.3 to 0.6
0 to 1.0
Molybdenum (Mo), % 0.9 to 1.1
6.0 to 6.5
Nickel (Ni), % 0
17.5 to 18.5
Nitrogen (N), % 0
0.18 to 0.22
Phosphorus (P), % 0 to 0.025
0 to 0.030
Silicon (Si), % 0 to 0.5
0 to 0.8
Sulfur (S), % 0 to 0.025
0 to 0.010