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S44725 Stainless Steel vs. ASTM A227 Spring Steel

Both S44725 stainless steel and ASTM A227 spring steel are iron alloys. They have 71% 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 S44725 stainless steel and the bottom bar is ASTM A227 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
500 to 640
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 22
12
Fatigue Strength, MPa 210
900 to 1160
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 81
72
Shear Strength, MPa 320
1030 to 1330
Tensile Strength: Ultimate (UTS), MPa 500
1720 to 2220
Tensile Strength: Yield (Proof), MPa 310
1430 to 1850

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 1100
400
Melting Completion (Liquidus), °C 1450
1450
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 17
52
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 15
1.8
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.1
1.4
Embodied Energy, MJ/kg 44
19
Embodied Water, L/kg 170
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 99
200 to 260
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 18
61 to 79
Strength to Weight: Bending, points 18
41 to 48
Thermal Diffusivity, mm2/s 4.6
14
Thermal Shock Resistance, points 16
55 to 71

Alloy Composition

Carbon (C), % 0 to 0.015
0.45 to 0.85
Chromium (Cr), % 25 to 28.5
0
Iron (Fe), % 67.6 to 73.5
97.4 to 99.1
Manganese (Mn), % 0 to 0.4
0.3 to 1.3
Molybdenum (Mo), % 1.5 to 2.5
0
Nickel (Ni), % 0 to 0.3
0
Niobium (Nb), % 0 to 0.26
0
Nitrogen (N), % 0 to 0.018
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.040
0.15 to 0.35
Sulfur (S), % 0 to 0.020
0 to 0.050
Titanium (Ti), % 0 to 0.26
0