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SAE-AISI 1018 Steel vs. ASTM Grade HP Steel

Both SAE-AISI 1018 steel and ASTM grade HP steel are iron alloys. They have a modest 37% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1018 steel and the bottom bar is ASTM grade HP steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 130 to 140
140
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 17 to 27
5.1
Fatigue Strength, MPa 180 to 270
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Tensile Strength: Ultimate (UTS), MPa 430 to 480
490
Tensile Strength: Yield (Proof), MPa 240 to 400
260

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Maximum Temperature: Mechanical, °C 400
1100
Melting Completion (Liquidus), °C 1460
1370
Melting Onset (Solidus), °C 1420
1330
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 52
12
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
34
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 1.4
5.8
Embodied Energy, MJ/kg 18
82
Embodied Water, L/kg 46
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 75 to 100
21
Resilience: Unit (Modulus of Resilience), kJ/m3 150 to 430
170
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 15 to 17
17
Strength to Weight: Bending, points 16 to 17
17
Thermal Diffusivity, mm2/s 14
3.2
Thermal Shock Resistance, points 14 to 15
11

Alloy Composition

Carbon (C), % 0.15 to 0.2
0.35 to 0.75
Chromium (Cr), % 0
24 to 28
Iron (Fe), % 98.8 to 99.25
29.2 to 42.7
Manganese (Mn), % 0.6 to 0.9
0 to 2.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
33 to 37
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0
0 to 2.5
Sulfur (S), % 0 to 0.050
0 to 0.040