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ASTM Grade HP Steel vs. ASTM A232 Spring Steel

Both ASTM grade HP steel and ASTM A232 spring steel are iron alloys. They have a modest 38% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is ASTM grade HP steel and the bottom bar is ASTM A232 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
540
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 5.1
14
Fatigue Strength, MPa 130
1040
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
73
Tensile Strength: Ultimate (UTS), MPa 490
1790
Tensile Strength: Yield (Proof), MPa 260
1610

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Maximum Temperature: Mechanical, °C 1100
420
Melting Completion (Liquidus), °C 1370
1460
Melting Onset (Solidus), °C 1330
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 12
52
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 34
2.3
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 5.8
2.0
Embodied Energy, MJ/kg 82
28
Embodied Water, L/kg 220
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 21
250
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 17
64
Strength to Weight: Bending, points 17
42
Thermal Diffusivity, mm2/s 3.2
14
Thermal Shock Resistance, points 11
53

Alloy Composition

Carbon (C), % 0.35 to 0.75
0.48 to 0.53
Chromium (Cr), % 24 to 28
0.8 to 1.1
Iron (Fe), % 29.2 to 42.7
96.8 to 97.7
Manganese (Mn), % 0 to 2.0
0.7 to 0.9
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 33 to 37
0
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 2.5
0.15 to 0.35
Sulfur (S), % 0 to 0.040
0 to 0.035
Vanadium (V), % 0
0.15 to 0.3