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ASTM A227 Spring Steel vs. ASTM Grade HH Steel

Both ASTM A227 spring steel and ASTM grade HH steel are iron alloys. They have 60% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is ASTM A227 spring steel and the bottom bar is ASTM grade HH steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 500 to 640
170
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12
11
Fatigue Strength, MPa 900 to 1160
150
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 72
79
Tensile Strength: Ultimate (UTS), MPa 1720 to 2220
580
Tensile Strength: Yield (Proof), MPa 1430 to 1850
270

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 400
1100
Melting Completion (Liquidus), °C 1450
1400
Melting Onset (Solidus), °C 1410
1360
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 52
14
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
20
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.4
3.7
Embodied Energy, MJ/kg 19
53
Embodied Water, L/kg 46
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 260
53
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 61 to 79
21
Strength to Weight: Bending, points 41 to 48
20
Thermal Diffusivity, mm2/s 14
3.8
Thermal Shock Resistance, points 55 to 71
12

Alloy Composition

Carbon (C), % 0.45 to 0.85
0.2 to 0.5
Chromium (Cr), % 0
24 to 28
Iron (Fe), % 97.4 to 99.1
52.9 to 64.8
Manganese (Mn), % 0.3 to 1.3
0 to 2.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
11 to 14
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 2.0
Sulfur (S), % 0 to 0.050
0 to 0.040