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SAE-AISI 4340M Steel vs. ASTM A227 Spring Steel

Both SAE-AISI 4340M steel and ASTM A227 spring steel are iron alloys. They have a very high 95% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340M steel and the bottom bar is ASTM A227 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
500 to 640
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.0
12
Fatigue Strength, MPa 690
900 to 1160
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
72
Shear Strength, MPa 1360
1030 to 1330
Tensile Strength: Ultimate (UTS), MPa 2340
1720 to 2220
Tensile Strength: Yield (Proof), MPa 1240
1430 to 1850

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 430
400
Melting Completion (Liquidus), °C 1440
1450
Melting Onset (Solidus), °C 1400
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 38
52
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
1.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.9
1.4
Embodied Energy, MJ/kg 26
19
Embodied Water, L/kg 55
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
200 to 260
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 84
61 to 79
Strength to Weight: Bending, points 51
41 to 48
Thermal Diffusivity, mm2/s 10
14
Thermal Shock Resistance, points 70
55 to 71

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.45 to 0.85
Chromium (Cr), % 0.7 to 1.0
0
Iron (Fe), % 93.3 to 94.8
97.4 to 99.1
Manganese (Mn), % 0.65 to 0.9
0.3 to 1.3
Molybdenum (Mo), % 0.35 to 0.45
0
Nickel (Ni), % 1.7 to 2.0
0
Phosphorus (P), % 0 to 0.012
0 to 0.040
Silicon (Si), % 1.5 to 1.8
0.15 to 0.35
Sulfur (S), % 0 to 0.012
0 to 0.050
Vanadium (V), % 0.050 to 0.1
0