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AWS BNi-4 vs. ASTM Grade HT Steel

AWS BNi-4 belongs to the nickel alloys classification, while ASTM grade HT steel belongs to the iron alloys. They have a modest 37% of their average alloy composition in common, which, by itself, doesn't mean much. There are 19 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is AWS BNi-4 and the bottom bar is ASTM grade HT steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
190
Poisson's Ratio 0.31
0.28
Shear Modulus, GPa 67
76
Tensile Strength: Ultimate (UTS), MPa 430
500

Thermal Properties

Latent Heat of Fusion, J/g 340
310
Melting Completion (Liquidus), °C 1070
1390
Melting Onset (Solidus), °C 980
1340
Specific Heat Capacity, J/kg-K 470
480
Thermal Expansion, µm/m-K 11
15

Otherwise Unclassified Properties

Base Metal Price, % relative 60
31
Density, g/cm3 8.5
8.0
Embodied Carbon, kg CO2/kg material 10
5.4
Embodied Energy, MJ/kg 140
76
Embodied Water, L/kg 220
190

Common Calculations

Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 14
18
Strength to Weight: Bending, points 15
18
Thermal Shock Resistance, points 16
12

Alloy Composition

Aluminum (Al), % 0 to 0.050
0
Boron (B), % 1.5 to 2.2
0
Carbon (C), % 0 to 0.060
0.35 to 0.75
Chromium (Cr), % 0
15 to 19
Cobalt (Co), % 0 to 0.1
0
Iron (Fe), % 0 to 1.5
38.2 to 51.7
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 91.4 to 95.5
33 to 37
Phosphorus (P), % 0 to 0.020
0 to 0.040
Selenium (Se), % 0 to 0.0050
0
Silicon (Si), % 3.0 to 4.0
0 to 2.5
Sulfur (S), % 0 to 0.020
0 to 0.040
Titanium (Ti), % 0 to 0.050
0
Zirconium (Zr), % 0 to 0.050
0
Residuals, % 0 to 0.5
0