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ASTM A387 Grade 21 Steel vs. AISI 409Cb Stainless Steel

Both ASTM A387 grade 21 steel and AISI 409Cb stainless steel are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 31 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 21 steel and the bottom bar is AISI 409Cb stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
24
Fatigue Strength, MPa 160 to 250
140
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
75
Shear Strength, MPa 310 to 370
270
Tensile Strength: Ultimate (UTS), MPa 500 to 590
420
Tensile Strength: Yield (Proof), MPa 230 to 350
200

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Maximum Temperature: Mechanical, °C 480
710
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
25
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
8.5
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
2.2
Embodied Energy, MJ/kg 23
31
Embodied Water, L/kg 62
94

Common Calculations

PREN (Pitting Resistance) 6.4
11
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
83
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
100
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18 to 21
15
Strength to Weight: Bending, points 18 to 20
16
Thermal Diffusivity, mm2/s 11
6.7
Thermal Shock Resistance, points 14 to 17
15

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.060
Chromium (Cr), % 2.8 to 3.3
10.5 to 11.7
Iron (Fe), % 94.4 to 96
84.9 to 89.5
Manganese (Mn), % 0.3 to 0.6
0 to 1.0
Molybdenum (Mo), % 0.9 to 1.1
0
Nickel (Ni), % 0
0 to 0.5
Niobium (Nb), % 0
0 to 0.75
Phosphorus (P), % 0 to 0.025
0 to 0.045
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.040