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ASTM A387 Grade 21 Steel vs. S17600 Stainless Steel

Both ASTM A387 grade 21 steel and S17600 stainless steel are iron alloys. They have 78% 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 21 steel and the bottom bar is S17600 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
270 to 410
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21
8.6 to 11
Fatigue Strength, MPa 160 to 250
300 to 680
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
76
Shear Strength, MPa 310 to 370
560 to 880
Tensile Strength: Ultimate (UTS), MPa 500 to 590
940 to 1490
Tensile Strength: Yield (Proof), MPa 230 to 350
580 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Maximum Temperature: Mechanical, °C 480
890
Melting Completion (Liquidus), °C 1470
1430
Melting Onset (Solidus), °C 1430
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
15
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
13
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
2.9
Embodied Energy, MJ/kg 23
42
Embodied Water, L/kg 62
130

Common Calculations

PREN (Pitting Resistance) 6.4
17
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
70 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
850 to 4390
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18 to 21
34 to 54
Strength to Weight: Bending, points 18 to 20
28 to 37
Thermal Diffusivity, mm2/s 11
4.1
Thermal Shock Resistance, points 14 to 17
31 to 50

Alloy Composition

Aluminum (Al), % 0
0 to 0.4
Carbon (C), % 0.050 to 0.15
0 to 0.080
Chromium (Cr), % 2.8 to 3.3
16 to 17.5
Iron (Fe), % 94.4 to 96
71.3 to 77.6
Manganese (Mn), % 0.3 to 0.6
0 to 1.0
Molybdenum (Mo), % 0.9 to 1.1
0
Nickel (Ni), % 0
6.0 to 7.5
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.030
Titanium (Ti), % 0
0.4 to 1.2

Comparable Variants