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ASTM A387 Grade 21L Class 1 vs. ASTM Grade HN Steel

Both ASTM A387 grade 21L class 1 and ASTM grade HN steel are iron alloys. They have 55% of their average alloy composition in common. There are 25 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 ASTM A387 grade 21L class 1 and the bottom bar is ASTM grade HN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
140
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21
9.0
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
77
Tensile Strength: Ultimate (UTS), MPa 500
500

Thermal Properties

Latent Heat of Fusion, J/g 260
310
Maximum Temperature: Mechanical, °C 480
1080
Melting Completion (Liquidus), °C 1470
1400
Melting Onset (Solidus), °C 1430
1350
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
13
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
26
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 1.8
4.6
Embodied Energy, MJ/kg 23
66
Embodied Water, L/kg 62
180

Common Calculations

PREN (Pitting Resistance) 6.4
22
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
17
Strength to Weight: Bending, points 18
18
Thermal Diffusivity, mm2/s 11
3.5
Thermal Shock Resistance, points 14
11

Alloy Composition

Carbon (C), % 0 to 0.1
0.2 to 0.5
Chromium (Cr), % 2.8 to 3.3
19 to 23
Iron (Fe), % 94.4 to 96.1
44.9 to 57.8
Manganese (Mn), % 0.3 to 0.6
0 to 2.0
Molybdenum (Mo), % 0.9 to 1.1
0 to 0.5
Nickel (Ni), % 0
23 to 27
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 2.0
Sulfur (S), % 0 to 0.025
0 to 0.040