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ASTM A387 Grade 21 Steel vs. S30601 Stainless Steel

Both ASTM A387 grade 21 steel and S30601 stainless steel are iron alloys. They have 63% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (6, 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 S30601 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
190
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
37
Fatigue Strength, MPa 160 to 250
250
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
75
Shear Strength, MPa 310 to 370
450
Tensile Strength: Ultimate (UTS), MPa 500 to 590
660
Tensile Strength: Yield (Proof), MPa 230 to 350
300

Thermal Properties

Latent Heat of Fusion, J/g 260
370
Maximum Temperature: Mechanical, °C 480
950
Melting Completion (Liquidus), °C 1470
1360
Melting Onset (Solidus), °C 1430
1310
Specific Heat Capacity, J/kg-K 470
500
Thermal Expansion, µm/m-K 13
15

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
20
Density, g/cm3 7.9
7.6
Embodied Carbon, kg CO2/kg material 1.8
3.9
Embodied Energy, MJ/kg 23
55
Embodied Water, L/kg 62
150

Common Calculations

PREN (Pitting Resistance) 6.4
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
200
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
230
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18 to 21
24
Strength to Weight: Bending, points 18 to 20
22
Thermal Shock Resistance, points 14 to 17
16

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.015
Chromium (Cr), % 2.8 to 3.3
17 to 18
Copper (Cu), % 0
0 to 0.35
Iron (Fe), % 94.4 to 96
56.9 to 60.5
Manganese (Mn), % 0.3 to 0.6
0.5 to 0.8
Molybdenum (Mo), % 0.9 to 1.1
0 to 0.2
Nickel (Ni), % 0
17 to 18
Nitrogen (N), % 0
0 to 0.050
Phosphorus (P), % 0 to 0.025
0 to 0.030
Silicon (Si), % 0 to 0.5
5.0 to 5.6
Sulfur (S), % 0 to 0.025
0 to 0.013