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Subject TITANIUM
Name Admin
Date Hit : 2183, Date : 2016/04/01 21:48
       
 

▣ Types of Titanium

  Grade Feature Main Use
Pure
Titanium 		Grade 1 Low strength Plate-type heat exchanger
Grade 2 Optimal combination of most-used Pure Titanium pipe’s
strength and weldability
Grade 3 High strength Tube-type heat exchanger,
Pressure-resistant skin
Titanium
Alloy		 Grade 5 The most produced Titanium Alloy aircraft, submarine
high strength, high heat-resistance
Grade 7 High corrosion-resistance chemistry
Grade 9 High strength + high corrosion-resistance submarine,
water pressure pipes
Grade 11 Similar to Grade 7 submarine exploration
Grade 12 High temperature resistance than Pure Titanium tube-type heat exchanger,
pressure-resistant skin
       
 

▣ Titanium’s Standard

Stan
dards 		Grade chemical substances(MAX, %) Mechanical Property (annealing)
N C H Fe O Ti tensile strength proof stress(0.2%offset) elongation(%)
kgf/mm Ksi Mpa(N/mm) kgf/mm Ksi Mpa(N/mm)
ASTM Grade 1 0.03 0.10 0.015 0.20 0.20 rema
ining 		>=25 >=25 >=240 18~32 24~45 170~310 >=24
Grade 2 0.03 0.10 0.015 0.30 0.30 >=35 >=50 >=345 24~46 40~65 275~450 >=20
Grade 3 0.05 0.10 0.015 0.30 0.30 >=46 >=65 >=450 39~56 55~80 380~550 >=18
Grade 4 0.05 0.10 0.015 0.50 0.50 >=56 >=80 >=550 49~67 70~95 485~655 >=15
       
 

▣ Titanium Alloy’s Standard

Stan
dard		 Grade chemical substances(MAX, %) Mechanical Property
(annealing)
N C H Fe O Ai V Pd Ti tensile
strength		 proof
stress
(0.2% offset)

elongation
(%)

Mpa
(N/m) 		Mpa
(N/m)
ASTM Grade5 0.05 0.10 0.015 0.40 0.20 5.5~
6.75		 3.5~4.5 - rema
ining		 895 830 10
Grade7 <=0.03 <=0.10 <=0.015 <=0.30 <=0.25 - - 0.1~
0.25		 >=345 275~450 >=20
Grade
11		 - - - - - - - - - - -
       
 

▣ Comparative Table of Titanium Corrosion Resistance

  Titanium Titanium
alloy 		Aluminum Aluminum
alloy
7075-T6 		Iron 18-8 STAINLESS AISI304 Hastelloy C
melting point 1,668 1,540~1,650 660 476~638 1,530 1,400~1,427 1,305
density(g/㎤) 4.51 4.42 2.70 2.80 7.86 8.03 8.92
Atomic Number 22 22 13 13 26 26 -
Atomic Weight 47.90 - 26.97 - 55.85 - -
Young's modulus
(㎬) 		108.5 1115.5 70.5 72.8 196.0 203.2 208.6
Poisson`s ratio 0.34 0.30~0.33 0.33 0.33 0.31 0.29 -
Resistivity
(μΩ-㎝,20℃) 		47~55 171 2.7 5.8 9.7 72 130
Electric
conductivity
(Compared to
that of Cu,%)		 3.1 1.1 64.0 30.0 18.0 2.4 1.3
Thermal
conductivity
(cal/㎤/sec/℃/㎝) 		0.041 0.018 0.487 0.294 0.145 0.039 0.031
Coefficient of linear
expansion
( ㎝/㎝/℃, 0~100℃) 		8.4×10-6 8.8×10-6 23.0×10-6 23.1×10-6 12.0×10-6 16.5×10-6 11.5×10-6
Specific heat
(cal/g/℃) 		0.12 0.13 0.21 0.23 0.11 0.12 0.09
       
 

▣ Comparative Table of Titanium Corrosion Resistance Feature

  Corrosion medium Composition
(%)		 Temperature
(℃)		 Corrosion Resistance

Pure
Titanium

Zirconium

 SUS304 SUS316 Hastelloy
Inorganic
acids 		Hydrochloric Acid
(HCl)		 1 25 A A B A A
  boiling D A D D C
10 25 B A D D C
  boiling D A D D D
Sulphuric Acid
(H2SO4)		 10 25 A A A A A
  boiling D A D C B
10 25 B A B B A
  boiling D A D D B
Nitric Acid
(HNO3)		 10 25 A A A A A
  boiling A A A A B
65 25 A A A A B
  boiling A A B B D
Organic
acid		 Acetic Acid
(CH3COOH) 		10 boiling A A A A A
60 boiling A A B B A
Oxalic Acid
((COOH)2) 		10 25 A A C B A
30 boiling D A D D A
Sacrolactic Acid
(CHO3CH(OH)COOH) 		10 25 A A B B B
85 boiling A A D D B
Alkali Caustic Soda
(NaOH) 		10 100 A A A A A
40 boiling D B B B B
Potassium Carbonate
(K2CO3) 		5 boiling A A A A A
20 boiling A A A A A
Inorganic
chlorides		 Sodium Chloride 25 25 A+ A B+ B+ B
- boiling A B B+ B+ B+
Magnesium
Chloride 		42 25 A+ A A+ A+ A
  boiling A A A+ A+ A+
Ferric Chloride 30 25 A+ D D D C
- boiling A D D D D
Inorganic
salts		 Sodium
Sulfate 		25 25 A A A A A
- boiling A A A A A
Sodium
Nitrate 		10 25 A A A A A
- boiling A A B B A
Sodium
Carbonate 		30 25 A A A A A
- boiling A A A A A
Gas Chlorine Dryness 25 D A A A A
Dampness 25 A+ D D D D
Hydrogen
Sulfide		 Dryness 25 A A C B A
Dampness 25 A A B A B
Ammonia 100 40 A A A A A
- 100 A A A A A
Etc. Seawater - 25 A A A+ A+ A
- 100 A+ A B+ B+ A+
Naptha - 80 A A A+ A+ A
- 180 A A A+ A+ A
A : 0.125mm/year or less  B : 0.125~0.5mm/year  C : 0.5~1.25mm/year  D : 1.25mm/year
※ Sometimes provokes local corrosion including pitting corrosion and corrosion of crack
       

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