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AISI 440A Stainless Steel vs. ASTM B817 Type I

AISI 440A stainless steel belongs to the iron alloys classification, while ASTM B817 type I belongs to the titanium alloys. There are 28 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 AISI 440A stainless steel and the bottom bar is ASTM B817 type I.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
100
Elongation at Break, % 5.0 to 20
4.0 to 13
Fatigue Strength, MPa 270 to 790
360 to 520
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 77
40
Tensile Strength: Ultimate (UTS), MPa 730 to 1790
770 to 960
Tensile Strength: Yield (Proof), MPa 420 to 1650
700 to 860

Thermal Properties

Latent Heat of Fusion, J/g 280
410
Maximum Temperature: Mechanical, °C 760
340
Melting Completion (Liquidus), °C 1480
1600
Melting Onset (Solidus), °C 1370
1550
Specific Heat Capacity, J/kg-K 480
560
Thermal Conductivity, W/m-K 23
7.1
Thermal Expansion, µm/m-K 10
9.6

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
1.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
2.0

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
36
Density, g/cm3 7.7
4.4
Embodied Carbon, kg CO2/kg material 2.2
38
Embodied Energy, MJ/kg 31
610
Embodied Water, L/kg 120
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 120
30 to 120
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
35
Strength to Weight: Axial, points 26 to 65
48 to 60
Strength to Weight: Bending, points 23 to 43
42 to 49
Thermal Diffusivity, mm2/s 6.2
2.9
Thermal Shock Resistance, points 26 to 65
54 to 68

Alloy Composition

Aluminum (Al), % 0
5.5 to 6.8
Carbon (C), % 0.6 to 0.75
0 to 0.1
Chlorine (Cl), % 0
0 to 0.2
Chromium (Cr), % 16 to 18
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 78.4 to 83.4
0 to 0.4
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0 to 0.75
0
Nitrogen (N), % 0
0 to 0.040
Oxygen (O), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.1
Sodium (Na), % 0
0 to 0.2
Sulfur (S), % 0 to 0.015
0
Titanium (Ti), % 0
87 to 91
Vanadium (V), % 0
3.5 to 4.5
Residuals, % 0
0 to 0.4