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AISI 347 Stainless Steel vs. ASTM A227 Spring Steel

Both AISI 347 stainless steel and ASTM A227 spring steel are iron alloys. They have 70% 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 AISI 347 stainless steel and the bottom bar is ASTM A227 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 210
500 to 640
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 34 to 46
12
Fatigue Strength, MPa 220 to 270
900 to 1160
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
72
Shear Strength, MPa 430 to 460
1030 to 1330
Tensile Strength: Ultimate (UTS), MPa 610 to 690
1720 to 2220
Tensile Strength: Yield (Proof), MPa 240 to 350
1430 to 1850

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 870
400
Melting Completion (Liquidus), °C 1430
1450
Melting Onset (Solidus), °C 1400
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
52
Thermal Expansion, µm/m-K 17
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 19
1.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.6
1.4
Embodied Energy, MJ/kg 52
19
Embodied Water, L/kg 150
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190 to 220
200 to 260
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 22 to 25
61 to 79
Strength to Weight: Bending, points 20 to 22
41 to 48
Thermal Diffusivity, mm2/s 4.3
14
Thermal Shock Resistance, points 13 to 15
55 to 71

Alloy Composition

Carbon (C), % 0 to 0.080
0.45 to 0.85
Chromium (Cr), % 17 to 19
0
Iron (Fe), % 64.1 to 74
97.4 to 99.1
Manganese (Mn), % 0 to 2.0
0.3 to 1.3
Nickel (Ni), % 9.0 to 13
0
Niobium (Nb), % 0 to 1.0
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 0.75
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.050