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ASTM A227 Spring Steel vs. N08904 Stainless Steel

Both ASTM A227 spring steel and N08904 stainless steel are iron alloys. They have 47% of their average alloy composition in common. There are 30 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 N08904 stainless 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
38
Fatigue Strength, MPa 900 to 1160
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
79
Shear Strength, MPa 1030 to 1330
370
Tensile Strength: Ultimate (UTS), MPa 1720 to 2220
540
Tensile Strength: Yield (Proof), MPa 1430 to 1850
240

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 400
1100
Melting Completion (Liquidus), °C 1450
1440
Melting Onset (Solidus), °C 1410
1390
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 52
12
Thermal Expansion, µm/m-K 12
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
32
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 1.4
5.8
Embodied Energy, MJ/kg 19
79
Embodied Water, L/kg 46
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 260
170
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 61 to 79
19
Strength to Weight: Bending, points 41 to 48
18
Thermal Diffusivity, mm2/s 14
3.1
Thermal Shock Resistance, points 55 to 71
12

Alloy Composition

Carbon (C), % 0.45 to 0.85
0 to 0.020
Chromium (Cr), % 0
19 to 23
Copper (Cu), % 0
1.0 to 2.0
Iron (Fe), % 97.4 to 99.1
38.8 to 53
Manganese (Mn), % 0.3 to 1.3
0 to 2.0
Molybdenum (Mo), % 0
4.0 to 5.0
Nickel (Ni), % 0
23 to 28
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.050
0 to 0.035