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ASTM A229 Spring Steel vs. ASTM A204 Steel

Both ASTM A229 spring steel and ASTM A204 steel are iron alloys.

For each property being compared, the top bar is ASTM A229 spring steel and the bottom bar is ASTM A204 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 490 to 550
160 to 180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 14
18 to 22
Fatigue Strength, MPa 710 to 790
200 to 220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Shear Strength, MPa 1020 to 1140
330 to 360
Tensile Strength: Ultimate (UTS), MPa 1690 to 1890
520 to 590
Tensile Strength: Yield (Proof), MPa 1100 to 1230
290 to 330

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
410
Melting Completion (Liquidus), °C 1450
1470
Melting Onset (Solidus), °C 1410
1420 to 1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 50
52
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
2.4
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.4
1.5
Embodied Energy, MJ/kg 19
20
Embodied Water, L/kg 46
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
90 to 95
Resilience: Unit (Modulus of Resilience), kJ/m3 3260 to 4080
220 to 290
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 60 to 67
18 to 21
Strength to Weight: Bending, points 40 to 43
18 to 20
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 54 to 60
15 to 17

Comparable Variants