MakeItFrom.com
Menu (ESC)

ASTM A387 Grade 21 Steel vs. SAE-AISI 1151 Steel

Both ASTM A387 grade 21 steel and SAE-AISI 1151 steel are iron alloys. They have a very high 96% 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 SAE-AISI 1151 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
210 to 220
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
11 to 17
Fatigue Strength, MPa 160 to 250
260 to 410
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
72
Shear Strength, MPa 310 to 370
430 to 480
Tensile Strength: Ultimate (UTS), MPa 500 to 590
710 to 800
Tensile Strength: Yield (Proof), MPa 230 to 350
390 to 660

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 480
400
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 41
51
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
10
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
12

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
1.8
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
1.4
Embodied Energy, MJ/kg 23
18
Embodied Water, L/kg 62
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
86 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
400 to 1170
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18 to 21
25 to 28
Strength to Weight: Bending, points 18 to 20
22 to 24
Thermal Diffusivity, mm2/s 11
14
Thermal Shock Resistance, points 14 to 17
22 to 25

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.48 to 0.55
Chromium (Cr), % 2.8 to 3.3
0
Iron (Fe), % 94.4 to 96
98.3 to 98.7
Manganese (Mn), % 0.3 to 0.6
0.7 to 1.0
Molybdenum (Mo), % 0.9 to 1.1
0
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0
Sulfur (S), % 0 to 0.025
0.080 to 0.13