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ASTM A387 Grade 21L Class 1 vs. AISI 317LM Stainless Steel

Both ASTM A387 grade 21L class 1 and AISI 317LM stainless steel are iron alloys. Both are furnished in the annealed condition. They have 64% 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 AISI 317LM stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21
46
Fatigue Strength, MPa 160
210
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
79
Shear Strength, MPa 310
410
Tensile Strength: Ultimate (UTS), MPa 500
590
Tensile Strength: Yield (Proof), MPa 230
230

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Maximum Temperature: Mechanical, °C 480
300
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 41
14
Thermal Expansion, µm/m-K 13
16

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
24
Density, g/cm3 7.9
8.0
Embodied Carbon, kg CO2/kg material 1.8
4.8
Embodied Energy, MJ/kg 23
65
Embodied Water, L/kg 62
170

Common Calculations

PREN (Pitting Resistance) 6.4
35
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84
210
Resilience: Unit (Modulus of Resilience), kJ/m3 140
130
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
21
Strength to Weight: Bending, points 18
20
Thermal Diffusivity, mm2/s 11
3.8
Thermal Shock Resistance, points 14
13

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.030
Chromium (Cr), % 2.8 to 3.3
18 to 20
Iron (Fe), % 94.4 to 96.1
54.4 to 64.5
Manganese (Mn), % 0.3 to 0.6
0 to 2.0
Molybdenum (Mo), % 0.9 to 1.1
4.0 to 5.0
Nickel (Ni), % 0
13.5 to 17.5
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.025
0 to 0.045
Silicon (Si), % 0 to 0.5
0 to 0.75
Sulfur (S), % 0 to 0.025
0 to 0.030