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AISI 305 Stainless Steel vs. ASTM A387 Grade 21L Class 1

Both AISI 305 stainless steel and ASTM A387 grade 21L class 1 are iron alloys. They have 73% 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 AISI 305 stainless steel and the bottom bar is ASTM A387 grade 21L class 1.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 220
150
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 34 to 45
21
Fatigue Strength, MPa 210 to 280
160
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
74
Shear Strength, MPa 400 to 470
310
Tensile Strength: Ultimate (UTS), MPa 580 to 710
500
Tensile Strength: Yield (Proof), MPa 230 to 350
230

Thermal Properties

Latent Heat of Fusion, J/g 290
260
Maximum Temperature: Mechanical, °C 540
480
Melting Completion (Liquidus), °C 1450
1470
Melting Onset (Solidus), °C 1400
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
41
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 16
4.1
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.2
1.8
Embodied Energy, MJ/kg 45
23
Embodied Water, L/kg 150
62

Common Calculations

PREN (Pitting Resistance) 18
6.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 210
84
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 320
140
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 20 to 25
18
Strength to Weight: Bending, points 20 to 23
18
Thermal Diffusivity, mm2/s 4.2
11
Thermal Shock Resistance, points 13 to 15
14

Alloy Composition

Carbon (C), % 0 to 0.12
0 to 0.1
Chromium (Cr), % 17 to 19
2.8 to 3.3
Iron (Fe), % 65.1 to 72.5
94.4 to 96.1
Manganese (Mn), % 0 to 2.0
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Nickel (Ni), % 10.5 to 13
0
Phosphorus (P), % 0 to 0.045
0 to 0.025
Silicon (Si), % 0 to 0.75
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.025