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ASTM A387 Grade 21L Class 1 vs. S44725 Stainless Steel

Both ASTM A387 grade 21L class 1 and S44725 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 75% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, 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 S44725 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
180
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21
22
Fatigue Strength, MPa 160
210
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 74
81
Shear Strength, MPa 310
320
Tensile Strength: Ultimate (UTS), MPa 500
500
Tensile Strength: Yield (Proof), MPa 230
310

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Maximum Temperature: Mechanical, °C 480
1100
Melting Completion (Liquidus), °C 1470
1450
Melting Onset (Solidus), °C 1430
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
17
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
15
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 1.8
3.1
Embodied Energy, MJ/kg 23
44
Embodied Water, L/kg 62
170

Common Calculations

PREN (Pitting Resistance) 6.4
33
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84
99
Resilience: Unit (Modulus of Resilience), kJ/m3 140
240
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
18
Strength to Weight: Bending, points 18
18
Thermal Diffusivity, mm2/s 11
4.6
Thermal Shock Resistance, points 14
16

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.015
Chromium (Cr), % 2.8 to 3.3
25 to 28.5
Iron (Fe), % 94.4 to 96.1
67.6 to 73.5
Manganese (Mn), % 0.3 to 0.6
0 to 0.4
Molybdenum (Mo), % 0.9 to 1.1
1.5 to 2.5
Nickel (Ni), % 0
0 to 0.3
Niobium (Nb), % 0
0 to 0.26
Nitrogen (N), % 0
0 to 0.018
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 0.040
Sulfur (S), % 0 to 0.025
0 to 0.020
Titanium (Ti), % 0
0 to 0.26