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Titanium
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  KOBELCO Titanium

CHARACTERISTICS
Highest Specific strength of existing metallic materials
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Characteristics Examples Representative Applications
Excellent in corrosion resistance Perfectly resistant to seawater Heat exchangers, construction material
Lightweight Lightweight equivalent to 60% of stainless steel Airplane engines
High strength Tensile strength of 275-735MPa
in commercially pure titanium and of 620-1800MPa in titanium alloys
Excellent in elasticity Modulus of longitudinal elasticity (Young's modulus) equivalent to
approximately 50% of stainless steel		 Golf club heads, springs
Excellent in low temperature tenacity Both commercially pure titanium and titanium alloys do not become brittle
at extremely low temperatures.		 Liquefied oxygen tanks
Low thermal conductivity Thermal conductivity equivalent to approximately 8% of aluminum,
equal to stainless steel		 Jig and tools for molten metal
Easy temperature rise Heat capacity equivalent to approximately 60% of stainless steel Pots and fry pans
High resistance to thermal shrink Thermal expansion rates equivalent to approximately 50% of stainless steel Construction material,
semiconductormanufacturing equipments
High electric resistance Electric resistance 30 times as high as copper, excellent in resistance
welding performance		 Seam welding of roof members, etc.
Extremely low magnetism Magnetic permeability 1.00005 Electronic devices (Stepper, etc.)
Superconductivity Manifestation in Ti-Nb base alloy Super induction motors, magnetic float trains
Excellent in biocompatibility Less ions fluent in body. Less toxicity Artificial joints, tooth roots, and cardiac valves
Gentle to skin Excellent control effects against metal allergies Watches, neck laces
Hydrogen occlusion Manifestation in Ti-Fe base alloy Hydrogen gas feeders
Short radioactive half value period Half life shorter than iron, nickel, and chrome Radioactive wastes disposing and storing vessels
Incombustible Authorized as incombustible material (Authorized No. NM-8596) Construction material
High class image Used as the housings for high class cameras and personal computers Housings of high class cameras and personal computers
Excellent in design properties Coloring by cathode oxidizing treatment available Monuments
PHYSICAL PROPERTIES
  Commercially
pure
titanium		 Titanium
alloy
Ti-6AI-4V		 Iron SUS 304 Super stainless steel
Austenitic Ferrite
Atomic number 22 - 26 - - -
Atomic weight 47.9 - 55.8 - - -
Crystalline structure HCP<
885
<BCC		 HCP<
approx.990
<BCC		 BCC<
830
<FCC		 FCC FCC BCC
Specific gravity 4.51 4.42
 7.9 8.0 8.0 8.0
Melting point() 1668 1540-
1650		 1530 1400-
1427		 1320-
1400		 1400
Young's modulus GPa 106 113 192 199 204 215
Poisson's ratio 0.34 0.30-0.33 0.31 0.29 - -
Electric resistance
( -cm, 20)		 47-55 171 9.7 72 90 72
Electric conductivity to Cu 3.1 1.1 18.0 2.4 1.9 2.4
Thermal conductivity
(W/m)		 17 7.5 62 16 13 17
Thermal expansioncoefficient
(X10-6/)[0100]		 8.4 8.8 12 17 16 16
Specific heat(J/kg-K) 520 520 460 500 500 450
Heat capacity
(J/m3-K)		 2.4
X
106		 2.3
X
106		 3.6
X
106		 4.0
X
106		 4.0
X
106		 3.6
X
106

  Aluminum Aluminum
alloy
7075		 Magnesium
alloy
AZ31		 Hastelloy
C		 Copper Zirconium Glass
Atomic number 13 - - - 29 40 -
Atomic weight 27.0 - - - 63.5 91.2 -
Crystalline structure FCC FCC HCP FCC FCC HCP<
863
<BCC
 amorphous
Specific gravity 2.7 2.8 1.8 8.9 8.9 6.5 2.4
Melting point() 660 476-638 838-905 1305 1083 1852 800
Young's modulus GPa 69 71 45 205 117 89 98
Poisson's ratio 0.33 0.33 0.35 - 0.34 0.33 0.24
Electric resistance
( -cm, 20)		 2.7 5.8 9.3 130 1.7 40-54 -
Electric conductivity to Cu 64.0 30.0 18.5 1.3 100 3.1 -
Thermal conductivity
(W/m)		 203 120 96 12 381 17 1
Thermal expansioncoefficient
(X10-6/)[0100]		 23 23 26 12 17 6 9
Specific heat(J/kg-K) 880 960 960 1050 390 290 1050
Heat capacity
(J/m3-K)		 2.4
X
106		 2.7
X
106		 1.9
X
106		 3.5
X
106		 3.5
X
106		 1.9
X
106		 2.5
X
106
The values listed above are the representative values. Where the values other than those of titanium are used for design, etc., it is recommended to inquire about the details to the manufacturer of each material or otherwise to verify them in the relevant expertise books.
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TITANIUM CLASSIFICATION
Classification Representative examples Features Representative
applications
Name Tensile strength
(representative value)
MPa
Commercially pure titanium JIS Class-1 320
 Excellent in corrosion
resistance and formability		 Press-formed products
Plate type heat exchangers
Welded tubes
Electrodes
Construction material
Civil products
Class-2 415
Class-3 545
Class-4 650
Titanium
alloy		 Corrosion resistant alloy
(Small amount of the platinum
group element is added) 		Ti-0.15Pd Same level as
commercially pure
titanium		 Corrosion resistance
higher than
commercially pure titanium		 Reaction vessels
Plate type heat exchangers
Welded tubes
Electrolytic tank members
type Ti-5Al-2.5Sn 860 Excellent in heat resistance
and low temperature properties		 Liquefied fuel tanks for rocket
applications (ELI*1Grade used)
- type Ti-6Al-4V 960 High strength, high ductility Airplane parts
Golf club heads
1170
(STA*3)
type Ti-15V-3Cr-3Sn-3Al 830
(ST*2)		 Cold processing
available		 Low
Young's
modulus		 Springs
Bicycle gears
Gold club heads
Fishing appliances
1400
(STA*3)		 Extra high strength
obtainable
*1 ELI : Extra low interstitial
*2 ST : Solution treatment
*3 STA : Solution treatment and aging		 Tensile strength: Strength value subject to annealed condition, unless otherwise specially indicated

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