Physical properties Comparison with other metals

Baoji Mingkun Nonferrous Metal Co.,Ltd

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Physical properties of commercially pure titanium are characterized as follows.

u High melting point of 1.668℃ (a little higher than steel)

u Light specific gravity of 4.51 (some 60% of steel, about 1.7 times of aluminum)

u Small coefficient of thermal expansion of 8.4x10-6/K (half of 18-8 stainless steel, 1/3 of aluminum)

u Small coefficient of thermal conductivity of 17w/m.k (nearly equal to 18-8 stainless steel)

u High electrical resistance of 0.55μΩ.m (higher than pure metals except 18-8 stainless steel)

u Non-magnetic material with permeability of 1.0001

u Crystal structure: close-packed hexagonal lattice and body-centered cubic lattice below and above

transformation temperature (885℃), respectively.

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u Small Young’s modulus of 106.3KN/mm2 (about half of steel, about 1.5 times of aluminum)

Comparison of physical properties with other metals

Item Atomic No. Atomic

weight

Specific

gravity

Melting

Point

Coefficient of linear

thermal expansion

Specific

heat

Coefficient of

thermal conductivity

Specific electrical

resistance

Electrical

conductivity

Young’s

modulus

Poisson’

s ratio

Titanium 22 47.90 4.51 1.668 8.4x10-6 0.519 17 0.55 3.1 106.3 0.34

Ti 6AL-4V - - 4.4 1.650 8.8x10-6 0.610 7.5 1.71 1.1 110 0.33

Steel 26 55.85 7.9 1.530 12x10-6 0.460 63 0.097 18 205.8 0.31

SUS 304 - - 7.9 1.400-1.42

0 17x10-6 0.502 16 0.72 2.4 199.9 0.3

Aluminum 13 26.97 2.7 650 23x10-6 0.879 205 0.027 64 69.1 0.33

7075 - - 2.8 476-638 23x10-6 0.962 121 0.058 30 71.5 0.33

Magnesium 12 24.32 1.7 650 25x10-6 1.004 159 0.043 40 44.8 0.35

Nickel 28 58.69 8.9 1.453 15x10-6 0.460 92 0.095 18 205.8 0.30

Hastelloy - - 8.9 1.305 11.3x10-6 0.385 13 1.3 1.3 204.4 -

Copper 29 63.57 8.9 1.083 14x10-6 0.385 385 0.017 100 107.8 0.34

Note): 18-8stainless steel: Cr(18%)-Ni(8%)-Fe(balance) Aluminum alloy 7075: Quenched and tempered duralumin [Cu(1.6%)-Mg(2.5%)-Cr(0.3%)-Zn(5.6%)-Al(balance)] Hastelloy C: 54Ni-17Mo-15Cr-5Fe-4W u Physical properties other than the above

Crystal structure α titanium (below 885℃): Close-packed hexagonal lattice a=2.9504A c=4.6833A c/a=1.587A β titanium (above 885℃): Body-centered cubic lattice a=3.3065A

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Latent heat of fusion:60.7J/g Magnetic permeability: 1.0001

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