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S44700 Stainless Steel vs. ASTM A387 Grade 21 Steel

Both S44700 stainless steel and ASTM A387 grade 21 steel are iron alloys. They have 71% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is S44700 stainless steel and the bottom bar is ASTM A387 grade 21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 23
21
Fatigue Strength, MPa 300
160 to 250
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 82
74
Shear Strength, MPa 380
310 to 370
Tensile Strength: Ultimate (UTS), MPa 600
500 to 590
Tensile Strength: Yield (Proof), MPa 450
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 300
260
Maximum Temperature: Mechanical, °C 1100
480
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1410
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Base Metal Price, % relative 18
4.1
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.6
1.8
Embodied Energy, MJ/kg 49
23
Embodied Water, L/kg 180
62

Common Calculations

PREN (Pitting Resistance) 42
6.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
84 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 480
140 to 320
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21
18 to 21
Strength to Weight: Bending, points 20
18 to 20
Thermal Shock Resistance, points 19
14 to 17

Alloy Composition

Carbon (C), % 0 to 0.010
0.050 to 0.15
Chromium (Cr), % 28 to 30
2.8 to 3.3
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 64.9 to 68.5
94.4 to 96
Manganese (Mn), % 0 to 0.3
0.3 to 0.6
Molybdenum (Mo), % 3.5 to 4.2
0.9 to 1.1
Nickel (Ni), % 0 to 0.15
0
Nitrogen (N), % 0 to 0.020
0
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.2
0 to 0.5
Sulfur (S), % 0 to 0.020
0 to 0.025