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SAE-AISI P4 Steel vs. ASTM A387 Grade 21 Steel

Both SAE-AISI P4 steel and ASTM A387 grade 21 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI P4 steel and the bottom bar is ASTM A387 grade 21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
74
Tensile Strength: Ultimate (UTS), MPa 390 to 1980
500 to 590

Thermal Properties

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

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.1
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 9.3
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 4.4
4.1
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.8
1.8
Embodied Energy, MJ/kg 23
23
Embodied Water, L/kg 68
62

Common Calculations

PREN (Pitting Resistance) 7.0
6.4
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 14 to 70
18 to 21
Strength to Weight: Bending, points 15 to 45
18 to 20
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 13 to 64
14 to 17

Alloy Composition

Carbon (C), % 0 to 0.12
0.050 to 0.15
Chromium (Cr), % 4.0 to 5.3
2.8 to 3.3
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 92.3 to 95.3
94.4 to 96
Manganese (Mn), % 0.2 to 0.6
0.3 to 0.6
Molybdenum (Mo), % 0.4 to 1.0
0.9 to 1.1
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0.1 to 0.4
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.025

Comparable Variants