Titanium Pipes & Tubes

Titanium and titanium alloys are attractive structural materials due to their high strength, low density, and excellent corrosion resistance. However, even though titanium is the fourth most abundant element in the Earth’s crust, the cost of titanium is high due to its high melting point and extreme reactivity. The high cost includes both the mill operations (extraction, ingot melting, and primary working) as well as many of the secondary operations conducted by the user. The advantages of titanium include:

 

  • The high strength-to-weight ratio of titanium alloys allows them to replace steel in many applications requiring high strength and fracture toughness. With a density of 4.5 g/cm3 (0.16 lb/in.3), titanium alloys are only about ½ as heavy as steel and nickel-base superalloys, yielding excellent strength-to-weight ratios.
  • Titanium alloys have much better fatigue strength than the other lightweight alloys, such as those of aluminum and magnesium.
  • Titanium alloys can operate at elevated temperatures, as high as 370 to 590 °C (700 to 1100 °F) depending on the specific alloy.
  • The corrosion resistance of titanium alloys is superior to both steel and aluminum alloys.

Properties

Titanium alloys are known for their combination of relatively low densities, high strengths, and excellent corrosion resistance. Yield strengths vary from 480 MPa (70 ksi) for some grades of commercial titanium to approximately 1100 MPa (160 ksi) for structural alloys. In addition to their static strength advantage, titanium alloys have much better fatigue strength than the other lightweight alloys, such as those of aluminum and magnesium. Titanium alloys can be used at moderately elevated temperatures, as high as 370 to 595 °C (700 to 1100 °F) depending on the specific alloy. In addition, some alpha-titanium alloys, especially the low interstitial grades, can also be used in cryogenic applications because they do not exhibit a ductile-to-brittle transition.

 

An important property of titanium alloys is corrosion resistance. When exposed to air, titanium immediately forms an oxide layer a few nanometers thick that protects the underlying metal from further oxidation. If this oxide layer is damaged, it re-forms in the presence of even trace amounts of oxygen or water. The oxide is strongly adherent and stable over a wide pH range of corrosive solutions as long as moisture and oxygen are present to maintain the protective oxide layer.

 

Thermal and Electrical Properties. Titanium and its alloys have very low thermal conductivities and high electrical resistivities.

 

Mechanical Properties. Commercially pure grades of titanium have an ultimate tensile strength of approximately 410 MPa (60 ksi), equal to that of common low-alloy steels, but are 45% lighter. Although titanium is approximately 60% more dense than aluminum, it is about twice as strong as common aluminum structural alloys. Certain alloys can be heat treated to achieve tensile strengths as high as 1400 MPa (200 ksi).

Applications

As a result of their high strength-to-density, good corrosion resistance, resistance to fatigue and crack growth, and their ability to withstand moderately high temperatures without creep, titanium alloys are used extensively in aerospace for both airframe and engine components. In aircraft, titanium alloys are used for highly loaded structural components such as bulkheads and landing gears. In commercial passenger aircraft engines, the fan, the low-pressure compressor, and approximately ⅔ of the high-pressure compressor are made from titanium alloys. Other important applications include firewalls, exhaust ducts, hydraulic tubing, and armor plating. Due to its high cost, titanium alloys are more widely used in military aircraft than commercial aircraft. For example, titanium alloys comprise approximately 42% of the structural weight of the new F-22 fighter aircraft, while the Boeing 757 contains only 5% Ti.

 

The excellent corrosion resistance of titanium makes it a valuable metal in the chemical processing and petroleum industries. Typical applications include pipe, reaction vessels, heat exchangers (Fig. 4), filters, and valves. Titanium is used in the pulp and paper industries, where it is exposed to corrosive sodium hypochlorite or wet chlorine gases. Due to excellent resistance to saltwater, titanium is used for ship propeller shafts and service water systems. The former Soviet Union actually developed large, welded titanium-hulled submarines.

 

A growing use of titanium is in medical applications. Titanium is biocompatible with the human body (nontoxic and not rejected by the body). It is used for surgical implements and implants such as hip balls and sockets and heart valves. The lower elastic modulus of titanium more closely matches the properties of human bone than do stainless steel alloys, which results in less bone degradation over long periods of time. Titanium is also used for dental implants to replace missing teeth.

 

Titanium is used in many sporting goods, including golf club heads, tennis rackets, bicycle frames, skis, scuba gas cylinders, and lacrosse sticks. Approximately 95% of titanium ore is refined into titanium dioxide (TiO2) and used as white fade-resistant pigment in paints, paper, toothpaste, and plastics.

 

  • Grade 1 Unalloyed titanium, low oxygen.
  • Grade 2 Unalloyed titanium, standard oxygen.
  • Grade 2H Unalloyed titanium (Grade 2 with 58 ksi minimum UTS).
  • Grade 3 Unalloyed titanium, medium oxygen.
  • Grades 1-4 are unalloyed and considered commercially pure or "CP". Generally the tensile and yield strength goes up with grade number for these "pure" grades. The difference in their physical properties is primarily due to the quantity of interstitial elements. They are used for corrosion resistance applications where cost, ease of fabrication, and welding are important.
  • Grade 5, also known as Ti6Al4VTi-6Al-4V or Ti 6-4, is the most commonly used alloy. It has a chemical composition of 6% aluminium, 4% vanadium, 0.25% (maximum) iron, 0.2% (maximum) oxygen, and the remainder titanium. It is significantly stronger than commercially pure titanium while having the same stiffness and thermal properties (excluding thermal conductivity, which is about 60% lower in Grade 5 Ti than in CP Ti). Among its many advantages, it is heat treatable. This grade is an excellent combination of strength, corrosion resistance, weld and fabricability.
  • Generally, Ti-6Al-4V is used in applications up to 400 degrees Celsius. It has a density of roughly 4420 kg/m3, Young's modulus of 110 GPa, and tensile strength of 1000 MPa. By comparison, annealed type 316 stainless steel has a density of 8000 kg/m3, modulus of 193 GPa, and tensile strength of only 570 MPa. And tempered 6061 aluminium alloy has 2700 kg/m3, 69 GPa, and 310 MPa, respectively.
  • Grade 6 contains 5% aluminium and 2.5% tin. It is also known as Ti-5Al-2.5Sn. This alloy is used in airframes and jet engines due to its good weldability, stability and strength at elevated temperatures.
  • Grade 7 contains 0.12 to 0.25% palladium. This grade is similar to Grade 2. The small quantity of palladium added gives it enhanced crevice corrosion resistance at low temperatures and high pH.
  • Grade 7H is identical to Grade 7 with enhanced corrosion resistance.
  • Grade 9 contains 3.0% aluminium and 2.5% vanadium. This grade is a compromise between the ease of welding and manufacturing of the "pure" grades and the high strength of Grade 5. It is commonly used in aircraft tubing for hydraulics and in athletic equipment.
  • Grade 11 contains 0.12 to 0.25% palladium. This grade has enhanced corrosion resistance.
  • Grade 12 contains 0.3% molybdenum and 0.8% nickel.
  • Grades 1314, and 15 all contain 0.5% nickel and 0.05%.
  • Grade 16 contains 0.04 to 0.08% palladium. This grade has enhanced corrosion resistance.
  • Grade 16H contains 0.04 to 0.08% palladium.
  • Grade 17 contains 0.04 to 0.08% palladium. This grade has enhanced corrosion resistance.
  • Grade 18 contains 3% aluminium, 2.5% vanadium and 0.04 to 0.08% palladium. This grade is identical to Grade 9 in terms of mechanical characteristics. The added palladium gives it increased corrosion resistance.
  • Grade 19 contains 3% aluminium, 8% vanadium, 6% chromium, 4% zirconium, and 4% molybdenum.
  • Grade 20 contains 3% aluminium, 8% vanadium, 6% chromium, 4% zirconium, 4% molybdenum and 0.04% to 0.08% palladium.
  • Grade 21 contains 15% molybdenum, 3% aluminium, 2.7% niobium, and 0.25% silicon.
  • Grade 23 contains 6% aluminium, 4% vanadium, 0.13% (maximum) Oxygen. Improved ductility and fracture toughness with some reduction in strength.
  • Grade 24 contains 6% aluminium, 4% vanadium and 0.04% to 0.08% palladium.
  • Grade 25 contains 6% aluminium, 4% vanadium and 0.3% to 0.8% nickel and 0.04% to 0.08% palladium.
  • Grades 2626H, and 27 all contain 0.08 to 0.14% ruthenium.
  • Grade 28 contains 3% aluminium, 2.5% vanadium and 0.08 to 0.14% ruthenium.
  • Grade 29 contains 6% aluminium, 4% vanadium and 0.08 to 0.14% ruthenium.
  • Grades 30 and 31 contain 0.3% cobalt and 0.05% palladium.
  • Grade 32 contains 5% aluminium, 1% tin, 1% zirconium, 1% vanadium, and 0.8% molybdenum.
  • Grades 33 and 34 contain 0.4% nickel, 0.015% palladium, 0.025% ruthenium, and 0.15% chromium .
  • Grade 35 contains 4.5% aluminium, 2% molybdenum, 1.6% vanadium, 0.5% iron, and 0.3% silicon.
  • Grade 36 contains 45% niobium.
  • Grade 37 contains 1.5% aluminium.
  • Grade 38 contains 4% aluminium, 2.5% vanadium, and 1.5% iron. This grade was developed in the 1990s for use as an armor plating. The iron reduces the amount of Vanadium needed as a beta stabilizer. Its mechanical properties are very similar to Grade 5, but has good cold workability similar to grade 9.

 

Designation

UNS DIN AMS Military MIL-T China Russia BSI Specifications Afnor
Grade 1 R50250 3.7025   T-81556,
T-81915
CP4 TAD BT1-00 TA1 ASTM B 265, 337, 338, 348; ASTM F 67 T-35
Grade 2 R50400 3.7035 4902, 4941, 4942, 4951 T-9046 CP-3,
T-81556
CP3 TA1 BT1-0 TA2, 3, 4, 5 ASTM F 67; B 337, 338, 348, ISO 5832-2. T-40
Grade 3 R50550 3.7055 4900 T-9046 CP-2,
T-81556
CP2 TA2 OT4-0   ASTM F 67; ASTM B 265, 337, 338, 348. T-50
Grade 4 R50700 3.7065 4901 T-9046 CP-1,
T-9047 CP-70, F-83142
CP1,
CP-70
TA3 OT4-1 TA 6,7,8,9 ASTM F 67; ASTM B 265, 337, 338, 348, 381  
Grade 5 R56400 3.7165 4905, 4906, 4911, 4920, 4928, 4930, 4931, 4934, 4935, 4954, 4965, 4967, 4993 T-9046 AB1/2,
T-9047,
T-81556,
T-81915,
F-83142
AB1/2
TA4 OT4 TA10, 11, 12,
TA28, 56, 59
B 265, B 348, B 367 Grade C-5, B 381 Grade F-5  
Grade 6 R54520         TA5 BT5      
Grade 7 R52400         TA6 BT5-1   ASTM B 265, B 337, B 338, B 348,B 381. ASTM F 467, F 468.  
Grade 9 R56320                 T-A3V2.5
Grade 10           TA8 BT6c      
Grade 11 R52250         TC1 BT3-1      
Grade 12 R53400         TC2 BT9   ASTM B 265, B 337, B 338, B 348,B 381.  
Grade 16 R52402                  
Grade 17 R52252                  
Grade 18 R56322                  
Garde 23 R56401                  
Grade 26 R52404                  
Grade 28 R52254                  

 

We Supply Titanium Pipes, Tubes, Sheets, Plates, Coil Strip as per the following standards. We can also supply other than this standards. So do send us your enquiry.

ASTM B363 WPT1 ASTM B363 WPT2 ASTM B363 WPT2H ASTM B363 WPT3
ASTM B363 WPT7 ASTM B363 WPT7H ASTM B363 WPT9 ASTM B363 WPT11
ASTM B363 WPT12 ASTM B363 WPT13 ASTM B363 WPT14 ASTM B363 WPT15
ASTM B363 WPT16 ASTM B363 WPT16H ASTM B363 WPT17 ASTM B363 WPT18
ASTM B363 WPT19 ASTM B363 WPT20 ASTM B363 WPT21 ASTM B363 WPT23
ASTM B363 WPT24 ASTM B363 WPT25 ASTM B363 WPT26 ASTM B363 WPT26H
ASTM B363 WPT27 ASTM B363 WPT28 ASTM B363 WPT33 ASTM B363 WPT34
ASTM B363 WPT35 ASTM B363 WPT36 ASTM B363 WPT37 ASTM B363 WPT38