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AISI 440A Stainless Steel vs. ASTM A227 Spring Steel

Both AISI 440A stainless steel and ASTM A227 spring steel are iron alloys. They have 82% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is AISI 440A stainless steel and the bottom bar is ASTM A227 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 5.0 to 20
12
Fatigue Strength, MPa 270 to 790
900 to 1160
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
72
Shear Strength, MPa 450 to 1040
1030 to 1330
Tensile Strength: Ultimate (UTS), MPa 730 to 1790
1720 to 2220
Tensile Strength: Yield (Proof), MPa 420 to 1650
1430 to 1850

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 760
400
Melting Completion (Liquidus), °C 1480
1450
Melting Onset (Solidus), °C 1370
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 23
52
Thermal Expansion, µm/m-K 10
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
1.8
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.2
1.4
Embodied Energy, MJ/kg 31
19
Embodied Water, L/kg 120
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 120
200 to 260
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 26 to 65
61 to 79
Strength to Weight: Bending, points 23 to 43
41 to 48
Thermal Diffusivity, mm2/s 6.2
14
Thermal Shock Resistance, points 26 to 65
55 to 71

Alloy Composition

Carbon (C), % 0.6 to 0.75
0.45 to 0.85
Chromium (Cr), % 16 to 18
0
Iron (Fe), % 78.4 to 83.4
97.4 to 99.1
Manganese (Mn), % 0 to 1.0
0.3 to 1.3
Molybdenum (Mo), % 0 to 0.75
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.015
0 to 0.050

Comparable Variants