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SAE-AISI A4 Steel vs. SAE-AISI H21 Steel

Both SAE-AISI A4 steel and SAE-AISI H21 steel are iron alloys. They have a moderately high 93% of their average alloy composition in common. There are 22 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 SAE-AISI A4 steel and the bottom bar is SAE-AISI H21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
76
Tensile Strength: Ultimate (UTS), MPa 710 to 2050
720 to 1790

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Melting Completion (Liquidus), °C 1450
1630
Melting Onset (Solidus), °C 1410
1580
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 40
27
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
23
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 1.8
4.5
Embodied Energy, MJ/kg 24
68
Embodied Water, L/kg 59
72

Common Calculations

PREN (Pitting Resistance) 5.3
19
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 25 to 73
23 to 58
Strength to Weight: Bending, points 23 to 46
21 to 38
Thermal Diffusivity, mm2/s 11
7.1
Thermal Shock Resistance, points 23 to 67
24 to 59

Alloy Composition

Carbon (C), % 1.0 to 1.1
0.28 to 0.36
Chromium (Cr), % 0.9 to 2.2
3.0 to 3.8
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 92 to 95.5
87.6 to 93.8
Manganese (Mn), % 1.8 to 2.2
0.15 to 0.4
Molybdenum (Mo), % 0.9 to 1.4
0
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0 to 0.5
0.15 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
8.5 to 10
Vanadium (V), % 0
0.3 to 0.6

Comparable Variants