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SAE-AISI H21 Steel vs. ASTM A387 Grade 21 Steel

Both SAE-AISI H21 steel and ASTM A387 grade 21 steel are iron alloys. They have a moderately high 94% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI H21 steel and the bottom bar is ASTM A387 grade 21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 76
74
Tensile Strength: Ultimate (UTS), MPa 720 to 1790
500 to 590

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Melting Completion (Liquidus), °C 1630
1470
Melting Onset (Solidus), °C 1580
1430
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 27
41
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Base Metal Price, % relative 23
4.1
Density, g/cm3 8.5
7.9
Embodied Carbon, kg CO2/kg material 4.5
1.8
Embodied Energy, MJ/kg 68
23
Embodied Water, L/kg 72
62

Common Calculations

PREN (Pitting Resistance) 19
6.4
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 23 to 58
18 to 21
Strength to Weight: Bending, points 21 to 38
18 to 20
Thermal Diffusivity, mm2/s 7.1
11
Thermal Shock Resistance, points 24 to 59
14 to 17

Alloy Composition

Carbon (C), % 0.28 to 0.36
0.050 to 0.15
Chromium (Cr), % 3.0 to 3.8
2.8 to 3.3
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87.6 to 93.8
94.4 to 96
Manganese (Mn), % 0.15 to 0.4
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0.15 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.025
Tungsten (W), % 8.5 to 10
0
Vanadium (V), % 0.3 to 0.6
0

Comparable Variants