MakeItFrom.com
Menu (ESC)

ASTM A387 Grade 21 Steel vs. Grade N7M Nickel

ASTM A387 grade 21 steel belongs to the iron alloys classification, while grade N7M nickel belongs to the nickel alloys. There are 25 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 ASTM A387 grade 21 steel and the bottom bar is grade N7M nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 21
22
Fatigue Strength, MPa 160 to 250
190
Poisson's Ratio 0.29
0.31
Shear Modulus, GPa 74
85
Tensile Strength: Ultimate (UTS), MPa 500 to 590
590
Tensile Strength: Yield (Proof), MPa 230 to 350
310

Thermal Properties

Latent Heat of Fusion, J/g 260
320
Maximum Temperature: Mechanical, °C 480
900
Melting Completion (Liquidus), °C 1470
1650
Melting Onset (Solidus), °C 1430
1590
Specific Heat Capacity, J/kg-K 470
390
Thermal Expansion, µm/m-K 13
9.9

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
75
Density, g/cm3 7.9
9.3
Embodied Carbon, kg CO2/kg material 1.8
16
Embodied Energy, MJ/kg 23
200
Embodied Water, L/kg 62
270

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
110
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 18 to 21
18
Strength to Weight: Bending, points 18 to 20
17
Thermal Shock Resistance, points 14 to 17
19

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.070
Chromium (Cr), % 2.8 to 3.3
0 to 1.0
Iron (Fe), % 94.4 to 96
0 to 3.0
Manganese (Mn), % 0.3 to 0.6
0 to 1.0
Molybdenum (Mo), % 0.9 to 1.1
30 to 33
Nickel (Ni), % 0
60.9 to 70
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