China titanium piping solution supplier: www.titaniuminfogroup.com

What is titanium pipe?

What is titanium pipe?

Titanium pipe is light in weight, high in strength and excellent in mechanical properties. It is widely used in heat exchange equipment, such as tubular heat exchanger, coil heat exchanger, serpentine heat exchanger, condenser, evaporator and transmission pipeline. Many nuclear power industries use titanium pipes as their unit standard pipes. According to the material, it can be divided into pure titanium pipe and alloy pipe. According to the processing technology, it can be divided into seamless pipe and welded pipe. As the raw material for the production of finished pipe, pipe blank is also used to make pipe target (pure titanium) for vacuum coating. Pure titanium pipe can be used to produce titanium coil, such as heat exchange, heating pipe, condensing pipe and pipe on heat exchanger.

1478239702 - What is titanium pipe?

  • Ti Tube Standards: ASTM B338, B861, B862, DIN 17 861, AMS 4941, AMS 4942
  • Tube Type: Welded Tube / Seamless Tube
  • Grade Material: CP Grades 1 – 4, Alloys: Grade 5, 7, 9, 12, 24, 26, 29
  • Seamless Tube Dimensions:
    • Outer Diameter Range: 0.5 – 330 mm
    • Wall Height Range: 0.4 – 10 mm
    • Length Range: < 15000 mm
  • Welded Tube Dimensions:
    • Outer Diameter Range: 114 – 5,000 mm
    • Wall Height Range: 0.5mm – 50mm
    • Length Range: < 15000 mm

Pipe Size Chart

The NPS is a commonly used titanium tube sizing standard for pipes used for high pressure and temperature applications, along with the DN standard used in Europe. We manufacture titanium pipes to both standards and also customer defined requirements.

20200208115633 76780 - What is titanium pipe?

Titanium Pipe Sizing Standards – NPS ⅛ to NPS 24
NPS DN OD[in (mm)] Wall thickness[in (mm)]
SCH 5 SCH 10s / 10 SCH 30 SCH 40s / 40 / STD SCH 80s / 80 / XS SCH 120 SCH 160 XXS
6 0.405 (10.29) 0.035 (0.889) 0.049 (1.245) 0.057 (1.448) 0.068 (1.727) 0.095 (2.413)
¼ 8 0.540 (13.72) 0.049 (1.245) 0.065 (1.651) 0.073 (1.854) 0.088 (2.235) 0.119 (3.023)
10 0.675 (17.15) 0.049 (1.245) 0.065 (1.651) 0.073 (1.854) 0.091 (2.311) 0.126 (3.200)
½ 15 0.840 (21.34) 0.065 (1.651) 0.083 (2.108) 0.095 (2.413) 0.109 (2.769) 0.147 (3.734) 0.188 (4.775) 0.294 (7.468)
¾ 20 1.050 (26.67) 0.065 (1.651) 0.083 (2.108) 0.095 (2.413) 0.113 (2.870) 0.154 (3.912) 0.219 (5.563) 0.308 (7.823)
1 25 1.315 (33.40) 0.065 (1.651) 0.109 (2.769) 0.114 (2.896) 0.133 (3.378) 0.179 (4.547) 0.250 (6.350) 0.358 (9.093)
32 1.660 (42.16) 0.065 (1.651) 0.109 (2.769) 0.117 (2.972) 0.140 (3.556) 0.191 (4.851) 0.250 (6.350) 0.382 (9.703)
40 1.900 (48.26) 0.065 (1.651) 0.109 (2.769) 0.125 (3.175) 0.145 (3.683) 0.200 (5.080) 0.281 (7.137) 0.400 (10.160)
2 50 2.375 (60.33) 0.065 (1.651) 0.109 (2.769) 0.125 (3.175) 0.154 (3.912) 0.218 (5.537) 0.250 (6.350) 0.343 (8.712) 0.436 (11.074)
65 2.875 (73.03) 0.083 (2.108) 0.120 (3.048) 0.188 (4.775) 0.203 (5.156) 0.276 (7.010) 0.300 (7.620) 0.375 (9.525) 0.552 (14.021)
3 80 3.500 (88.90) 0.083 (2.108) 0.120 (3.048) 0.188 (4.775) 0.216 (5.486) 0.300 (7.620) 0.350 (8.890) 0.438 (11.125) 0.600 (15.240)
90 4.000 (101.60) 0.083 (2.108) 0.120 (3.048) 0.188 (4.775) 0.226 (5.740) 0.318 (8.077) 0.636 (16.154)
NPS[5] DN
[2]
OD
[in (mm)]
Wall thickness
[in (mm)]
SCH 5 SCH 10s/10 SCH 20 SCH 30 SCH 40s/40
/STD
SCH 60 SCH 80s/80
/XS
SCH 100 SCH 120 SCH 140 SCH 160 XXS[5]
4 100 4.500 (114.30) 0.083 (2.108) 0.120 (3.048) 0.188 (4.775) 0.237 (6.020) 0.281 (7.137) 0.337 (8.560) 0.437 (11.100) 0.531 (13.487) 0.674 (17.120)
115 5.000 (127.00) 0.247 (6.274) 0.355 (9.017) 0.710 (18.034)
5 125 5.563 (141.30) 0.109 (2.769) 0.134 (3.404) 0.258 (6.553) 0.375 (9.525) 0.500 (12.700) 0.625 (15.875) 0.750 (19.050)
6 150 6.625 (168.28) 0.109 (2.769) 0.134 (3.404) 0.280 (7.112) 0.432 (10.973) 0.562 (14.275) 0.719 (18.263) 0.864 (21.946)
7[5] 7.625 (193.68) 0.301 (7.645) 0.500 (12.700) 0.875 (22.225)
8 200 8.625 (219.08) 0.109 (2.769) 0.148 (3.759) 0.250 (6.350) 0.277 (7.036) 0.322 (8.179) 0.406 (10.312) 0.500 (12.700) 0.593 (15.062) 0.719 (18.263) 0.812 (20.625) 0.906 (23.012) 0.875 (22.225)
9[5] 9.625 (244.48) 0.342 (8.687) 0.500 (12.700)
NPS[5] DN
[2]
OD
[in (mm)]
Wall thickness
[in (mm)]
SCH 5s SCH 5 SCH 10s SCH 10 SCH 20 SCH 30 SCH 40s/STD
10 250 10.75 (273.05) 0.134 (3.404) 0.134 (3.404) 0.165 (4.191) 0.165 (4.191) 0.250 (6.350) 0.307 (7.798) 0.365 (9.271)
12 300 12.75 (323.85) 0.156 (3.962) 0.165 (4.191) 0.180 (4.572) 0.180 (4.572) 0.250 (6.350) 0.330 (8.382) 0.375 (9.525)
14 350 14.00 (355.60) 0.156 (3.962) 0.156 (3.962) 0.188 (4.775) 0.250 (6.350) 0.312 (7.925) 0.375 (9.525) 0.375 (9.525)
16 400 16.00 (406.40) 0.165 (4.191) 0.165 (4.191) 0.188 (4.775) 0.250 (6.350) 0.312 (7.925) 0.375 (9.525) 0.375 (9.525)
18 450 18.00 (457.20) 0.165 (4.191) 0.165 (4.191) 0.188 (4.775) 0.250 (6.350) 0.312 (7.925) 0.437 (11.100) 0.375 (9.525)
20 500 20.00 (508.00) 0.188 (4.775) 0.188 (4.775) 0.218 (5.537) 0.250 (6.350) 0.375 (9.525) 0.500 (12.700) 0.375 (9.525)
22 550 22.00 (558.80) 0.188 (4.775) 0.188 (4.775) 0.218 (5.537) 0.250 (6.350) 0.375 (9.525) 0.500 (12.700) 0.375 (9.525)
24 600 24.00 (609.60) 0.218 (5.537) 0.218 (5.537) 0.250 (6.350) 0.250 (6.350) 0.375 (9.525) 0.562 (14.275) 0.375 (9.525)

Specifications of Titanium Pipe

Specifications of Titanium Seamless Pipe

Dimension Outer Diameter Thickness Length
Size Range: 0.5mm – 330mm 0.4mm – 10mm Max 15m
Manufacturing Standards ASTM B338ASTM B861DIN 17 861

Specifications of Titanium Welded Pipe

Dimension Outer Diameter Thickness Length
Size Range: 114mm – 20000mm 0.5mm – 50mm Max 15m
Manufacturing Standards ASTM B338ASTM B862

Properties of seamless titanium pipe

1. Seamless titanium pipe.

Titanium pipe has high strength. Titanium alloy has very high strength, its tensile strength is 686-1176mpa, and its density is only about 60% of steel, so its specific strength is very high.

2. The hardness of seamless titanium pipe is high.

The hardness HRC of titanium alloy (as annealed) is 32-38.

3. The elastic modulus of seamless titanium pipe is low.

The elastic modulus of titanium alloy (annealed) is 1.078 × 10-1.176 × 10MPa, about half of that of steel and stainless steel. Executive Standards: ASTM B337, ASTMB338, ASTM B338 B861

4. Excellent high and low temperature performance.

At high temperature, titanium alloy can still maintain good mechanical properties, its heat resistance is higher than that of aluminum alloy, and its working temperature range is wide. At present, the working temperature of the new heat-resistant titanium alloy can reach 550-600 ℃; at low temperature, the strength of titanium alloy is higher than that at normal temperature, and it has good toughness. At – 253 ℃, the low temperature titanium alloy can still maintain good toughness.

5. Seamless titanium pipe has strong corrosion resistance.

When titanium is in the air below 550 ℃, a thin and compact titanium oxide film will form on its surface. Therefore, its corrosion resistance is better than that of most stainless steels in the oxidizing media such as atmosphere, sea water, nitric acid, sulfuric acid and strong alkali. Seamless titanium pipe is made by extrusion technology, and welded titanium pipe is made by welding after plate curling. Generally, the wall thickness of seamless titanium pipe is relatively small, and the caliber is also relatively small.

Chemical Composition of Titanium Pipe

Titanium Grade 1-4 is pure Titanium, the other grades are alloys. Pure Titanium is used due to its high corrosion resistance, the alloys because of the extremely high strength to weight ratio.

  • Grade 1. Pure Titanium, relatively low strength and high ductility.
  • Grade 2. The pure titanium most used. The best combination of strength, ductility and weldability.
  • Grade 3. High strength Titanium, used for Matrix-plates in shell and tube heat exchangers.
  • Grade 5. The most manufactured titanium alloy. Exceedingly high strength. High heat resistance.
  • Grade 7. Superior corrosion resistance in reducing and oxidizing environments.
  • Grade 9. Very high strength and corrosion resistance..
  • Grade 12. Better heat resistance than pure Titanium. Applications as for Grade 7 and Grade 11.
  • Grade 23. Titanium-6Aluminum-4Vanadium ELI (Extra Low Interstitial) Alloy for surgical implant Applications.

CHEMICAL, PHYSICAL AND
MECHANICAL PROPERTIES

CHEMICAL COMPOSITION

ASTM Grade

(Max. Values)

1

2

5

7

9

12

23

N, Nitrogen

0,03

0,03

0,05

0,03

0,02

0,03

0,03

C, Carbon

0,1

0,1

0,1

0,1

0,05

0,08

0,08

H, Hydrogen

0,015

0,015

0,0125

0,015

0,013

0,015

0,0125

Fe, Iron

0,2

0,3

0,4

0,3

0,25

0,3

0,25

O, Oxygen

0,18

0,25

0,20

0,25

0,12

0,25

0.13

Pd, Palladium

0,12-0,25

Al, Aluminum

5,5-6,75

2,5-3,5

5,5-6.5

Mo, Molybdenum

0,2-0,4

V, Vanadium

3,5-4,5

2,0-3,0

3,5-4,5

Ni, Nickel

0,6-0,9

Ti, Titanium

Bal.

Bal.

Bal.

Bal.

Bal.

Bal.

Bal.

MECHANICAL PROPERTIES

Tensile strength, min (Mpa)

240,00

345,00

895,00

345,00

620,00

483,00

828,00

Yield strength, 0,2% Offset,
min (Mpa)

170,00

275,00

825,00

275,00

483,00

345,00

759,00

Elongation (in 4D, min, %)

24,00

20,00

10,00

20,00

15,00

18,00

10,00

Reduction of Area, min, %

30,00

30,00

25,00

30,00

25,00

25,00

15,00

Hardness * Interpolated

Rb70

Rb80

Rc36

Rb80

Rc28

Rc17*

List of ASTM Grades 

ASTM Grade

Description

1

Unalloyed Titanium – Low Oxygen

2

Unalloyed Titanium – Standard Oxygen

3

Unalloyed Titanium – Medium Oxygen

4

Unalloyed Titanium – High Oxygen

5

Titanium – 6%Al – 4%V

6

Titanium – 5%Al – 2.5%Sn

7

Unalloyed titanium plus 0.12 % to 0.25 % Pd, standard oxygen,

9

Titanium – 3%Al – 2.5%V

10

Titanium – 11.5%Mo – 6%Zr – 4.5%Sn

11

Unalloyed titanium plus 0.12 % to 0.25 % Pd, low oxygen,

12

Titanium – 0.3%Mo – 0.8%Ni

13

Titanium – 0.5%Ni – 0.05%Ru, low oxygen

14

Titanium – 0.5%Ni – 0.05%Ru, standard oxygen

15

Titanium – 0.5%Ni – 0.05%Ru, medium oxygen

16

Unalloyed titanium plus 0.04 % to 0.08 % Pd, standard oxygen,

17

Unalloyed titanium plus 0.04 % to 0.08 % Pd, low oxygen

18

Titanium alloy – 3%Al – 2.5 %V plus 0.04 % to 0.08 % Pd

19

Titanium – 3%Al – 8%V – 6%Cr – 4%Zr – 4%Mo

20

Titanium – 3%Al – 8%V – 6%Cr – 4%Zr – 4%Mo plus 0.04% to 0.08%Pd

21

Titanium – 15%Mo – 3%Al – 2.7%Nb – 0.25%Si

23

Titanium – 6%Al – 4%V, extra low interstitial, (ELI)

24

Titanium – 6%Al – 4%V plus 0.04 % to 0.08 %Pd

25

Titanium – 6%Al – 4%V plus 0.3% to 0.8%Ni and 0.04% to 0.08 %Pd

26

Unalloyed titanium plus 0.08 to 0.14 %Ru, standard oxygen

27

Unalloyed titanium plus 0.08 to 0.14 %Ru, low oxygen

28

Titanium – 3%Al – 2.5%V plus 0.08-0.14 %Ru

29

Titanium – 6%Al – 4%V, extra low interstitial, (ELI) plus 0.08-0.14 %Ru

30

Titanium – 0.3%Co – 0.05%Pd, standard oxygen

31

Titanium – 0.3%Co – 0.05%Pd, medium oxygen

32

Titanium – 5%Al – 1%V – 1%Sn – 1%Zr – 0.8%Mo

33

Titanium – 0.4%Ni – 0.015%Pd – 0.025%Ru – 0.15%Cr, standard oxygen

34

Titanium – 0.4%Ni – 0.015%Pd – 0.025%Ru – 0.15%Cr, medium oxygen

35

Titanium – 4.5%Al – 2%Mo – 1.6%V – 0.5%Fe – 0.3%Si

What are the uses for titanium pipe?

Titanium pipe is being used in an increasing number of applications because there are so many cases in which stainless steel and other materials are simply insufficient. Tubing is one of the common titanium mill products, and it is used in a range of products because of its superior strength-to-weight ratio and corrosion resistance. Let’s take a deeper look at titanium pipe and what it is commonly used for.

What is the right grade to use?

Most grades of titanium are approved for pressurized service, meaning there are many different options out there. While all grades are usable, grade 2 is the one that is employed in most situations. This grade is readily available, which also makes it a good choice for quick production runs as well as larger orders.

What are the common uses for titanium pipe?

app21 - What is titanium pipe?

Titanium tubing continues to grow in popularity in a variety of different industries. The most common include:

  • Chemical Processing – Titanium has the corrosion resistance necessary to last for a long time in some extreme situations.
  • Oil and Gas – High pressure, high temperature applications like those in oil and gas wells require pipiline that can withstand the constant use.
  • Aerospace – The tube provides resistance to fatigue and crack growth, can handle high temperatures without creep, and the lightweight pipes are very valuable for their strength-to-density ratio.
  • Power Generation – Many power plants around the country have already installed grade-2 titanium to deal with any problems that might otherwise come from the condenser and the associated boiler tube failures.

Production process of titanium pipe

The production process of industrial pure titanium pipe is as follows:

Surface treatment – blanking – rolling – degreasing – drying – cut to length – annealing – straightening – Pickling – rolling – degreasing of finished products – drying – annealing – straightening – cut to length of finished products – Pickling – Inspection – packaging

20200208103719 55318 - What is titanium pipe?

(Note: the above processes can be added or reduced according to product specifications and performance requirements. )

For the titanium tube blank lubricated by copper plating before rolling, a copper removal process is added before the surface treatment of this process.

Pickling process

In the production process of industrial pure titanium pipe, pickling is a very important process, which can not be ignored. In the process of hot working or heat treatment, titanium tube will react with oxygen and other gases in furnace gas without protective atmosphere to form oxide layer. The oxide layer formed on the surface of titanium tube is very harmful to the process after pickling and the quality of the final product. For example, if titanium tube is rolled with oxide layer, the tube will have defects. At the same time, due to the existence of oxide layer, the oxide layer will be pressed into the tube surface, resulting in unsatisfactory surface. It directly affects the quality of titanium tube products, material consumption, productivity and economic benefits.

As we all know, acid pickling is the process of removing the oxide layer on the surface of metals by treatment in acid, alkali, salt and their solution. There are many ways to remove oxide layer, the traditional way is to use inorganic strong acid, such as H2SO4 sulfuric acid, hydrochloric acid (HCI), nitric acid (HNO3) and hydrofluoric acid (HF). This kind of method uses the chemical reaction between oxide layer and acid to remove oxide layer. For different materials, one of them can be used according to their performance characteristics.

Among the oxide layers of industrial pure titanium tubes, titanium dioxide (TiO2) is the main one, followed by many low-cost titanium oxides, such as TiO, Ti2O3, TiO2. In addition, there are also high valence oxides of titanium, such as TiO2. The results show that the protective oxide layer is formed on the surface of titanium tube when it is pickled in dilute sulfuric acid wash solution of < 5% at room temperature, which can protect titanium from further erosion by dilute sulfuric acid, but the pickling reaction with titanium is obvious in sulfuric acid of > 5%. At room temperature, the corrosion rate of about 40% sulfuric acid to titanium is the fastest. Hydrochloric acid with concentration less than 5% does not react with titanium at room temperature. When the temperature increases, even dilute hydrochloric acid will corrode titanium, but hydrochloric acid with concentration more than 10% at 70 ℃ and hydrochloric acid with concentration of 1% at 100 ℃ will corrode titanium obviously. However, when there is oxide layer or metal ion (such as copper, etc.) in hydrochloric acid solution, the corrosion effect of hydrochloric acid on titanium can be reduced. Hydrofluoric acid (HF) is the strongest solvent for titanium. Even if the concentration of hydrofluoric acid is 1%, it can react violently with titanium.

  • 2Ti + 6HF = 2TiF3 + 3H2

When there are metal ions such as iron and copper in hydrofluoric acid solution, the dissolution of titanium can be accelerated.

Titanium tube with rough surface is most likely to react with hot and cold dilute nitric acid (HNO3):
  • 3Ti + 4HNO3 + 4H2O = 3H4TiO4+ 4NO
  • 3Ti + 4HNO3 + H2O = 3H2TiO3 + 4NO

In view of the corrosion characteristics of various acids on titanium pipe, in order to effectively remove the oxide layer on the surface of titanium pipe, the pickling of titanium pipe adopts nitric acid and hydrofluoric acid, and its formula and process are as follows:

The solution concentration ratio is:
  • (35 %~40 %) HNO3  +  (5 %~7 %) HF + Remaining H2O 

The solution temperature is: 30 ℃~50 ℃

The test shows that the above formula and process have some shortcomings: first, the reaction of titanium tube entering into the acid solution is too violent, which makes the temperature of the acid solution rise rapidly, and even makes the acid solution boil, which is very easy to cause oxidation and combustion of the titanium tube matrix, thus increasing the loss of the titanium tube matrix; second, the acid solution splashed out in such a violent reaction process, It is quite harmful to the operators; third, the operating environment of the employees is poor and the pollution is too large. In view of the above reasons, the acid and washing formula and process of titanium tube are adjusted as follows:

Main components of solution: nitric acid (HNO3) + hydrofluoric acid (HF)

The solution concentration ratio is: (25 %~28 %) HNO3  +  (3 %~5 %) HF + Remaining H2O 

The solution temperature is: ≤30 ℃ 

Pickling time: 10-20 minutes

The results show that the acid pickling condition after adjustment is better, the reaction of titanium tube entering into acid solution is more stable, and the acid pickling loss rate of titanium tube matrix can be reduced by 30% – 50%.

It should be noted that the titanium tube after pickling must be washed and dried. After pickling in acid solution, the titanium tube can remove the oxide layer, but there is a part of residual acid on the surface of titanium tube more or less. If the residual acid is not removed, part of hydrogen will diffuse to the titanium tube matrix due to the chemical action of residual acid, which will reduce the plasticity of titanium tube. At the same time, the existence of residual acid on the surface of titanium tube will cause premature wear of roller and waste products of titanium tube. Therefore, there is no residual acid on the surface of titanium tube after pickling.

The purpose of drying is to drive out the hydrogen atom in the metal lattice in time, so as to avoid the hydrogen embrittlement of titanium tube during rolling and improve the lubrication performance.

Development of rolling process

The production practice shows that different rolling processes for the same steel tube will get different results. Therefore, the reasonable rolling process is the main condition to ensure the high yield and high quality of industrial pure titanium pipe. It is a basic comprehensive technical subject in the production of industrial pure titanium pipe.

In the past, for the products that have not been produced, the process formulation mainly depends on the experience of brother units and reference materials. The experience from the success or failure of production practice is undoubtedly very valuable and reliable. However, its application scope is local, such as rolling mill equipment, strength of other parts, elastic deformation, wear, plastic deformation, estimation of mechanical parameters, etc. For this reason, the rolling process of titanium tube is determined under the conditions of comprehensive performance, characteristics, condition of tube blank, delivery requirement standard of finished product, capacity of rolling mill equipment and production conditions of industrial pure titanium tube.

For φ 76mm × 7mm industrial pure titanium pipe rolled into φ 45mm × 1.2mm finished product, the rolling process is determined as follows:

  • φ76mm x 7mm → φ51mm x 3mm → φ48mm x 2mm → φ45mm x 1. 2mm

It should be noted that when rolling φ 51mm × 3mm industrial pure titanium pipe, MoS2 lubricant should be applied to the inner and outer walls of the raw pipe for lubrication. It is strictly prohibited to use chlorinated paraffin as lubricant to prevent the pipe from reacting with chloride ion due to high temperature during rolling, resulting in corrosion of the pipe matrix.

Heat treatment process

Heat treatment is a processing method different from rolling. It does not change the size and shape of industrial pure titanium pipe, nor damage the titanium pipe, but essentially changes or improves the performance of titanium pipe. That is to say, the industrial pure titanium tube is used for heating, heat preservation and cooling in the solid range, so as to change its structure and obtain the required performance.

In the rolling process of industrial pure titanium pipe, as other steel pipes, there is a basic feature, that is, the rolled pipe will produce the change of shape and size that can not be recovered by itself plastic deformation.

In the process of plastic deformation, the structure and properties of industrial pure titanium tube will also change. The most important one is work hardening, that is, with the increase of deformation degree, the deformation resistance increases, the strength and hardness increase, while the plasticity and toughness decrease, so that the power consumption of titanium tube in cold rolling increases and the rolling amount is limited.

The purpose of heat treatment is to transform and recrystallize the structure of industrial pure titanium pipe, so as to recover its plasticity before rolling, eliminate the residual stress caused by “work hardening” during rolling or uneven heat dissipation during cooling during hot extrusion, and the existence of such residual stress reduces the plasticity of titanium pipe. Or to eliminate the defects of microstructure caused by improper hot extrusion process, so that the rolling can continue. It can be seen that heat treatment is an indispensable and important process in rolling process.

The oxide layer will be produced when the industrial pure titanium tube is annealed in unprotected atmosphere. Its main component is titanium dioxide (TiO2).

The results show that the oxidation of titanium in air is very slow when the temperature is less than 100 ℃, and only the surface is oxidized at 500 ℃. With the increase of temperature, the surface oxide began to dissolve in titanium, and oxygen began to diffuse to the inner lattice of metal. However, at 700 ℃, oxygen did not enter into the inner lattice of metal in large quantities. When the temperature is over 700 ℃, the diffusion of oxygen to the metal accelerates, and titanium begins to react violently with oxygen in the air at high temperature. The thickness of the oxide layer is closely related to the annealing temperature and time, as shown in Table 1.

Table 1 Relationship between thickness of oxide layer and annealing temperature

Annealing temperature / ℃ Color of oxide layer Thickness of oxide layer / mm
<200 Silvery white Extremely thin
-300 Canary yellow Extremely thin
-400 Golden Extremely thin
-500 Blue Extremely thin
-600 Violet 0.005
-700—800 Red gray 0.0067~0.025
-900 Grey 0.03~0.050

The heat treatment of titanium tube usually adopts the chamber furnace cover to pass argon, but the furnace temperature of the chamber annealing furnace is very uneven, and the sealing performance of the cover is poor. Although argon is used for protection, the surface oxidation of titanium tube often occurs. In serious cases, the surface color of titanium tube is red gray or gray, which can be seen from table 1 as relatively thick oxide layer. This has brought some difficulties to pickling. Improper operation will lead to under pickling or over pickling, and the loss of titanium tube matrix will be large; moreover, the consumption of fuel and argon will also be large, resulting in high production cost. Therefore, in order to improve the heat treatment effect of titanium tube and reduce the production cost, the continuous roller hearth furnace is used instead of the chamber furnace heat treatment.

The process is as follows:

The temperature of furnace inlet is 720 ℃; the speed is voltage: 4.5V, time: 40min; the temperature of furnace outlet is 250 ℃; the speed is slow, air cooling.

The test results show that the surface color of titanium tube treated by this furnace type is light yellow after it is discharged from the furnace, gradually changes to golden yellow, and finally becomes light blue, which is easy to be cleaned by pickling.

Although the production of industrial pure titanium pipe is difficult, as long as we know the characteristics of industrial pure titanium pipe, and correctly formulate the relevant processes in the production process, we can produce high-quality industrial pure titanium pipe.

Quality assurance of titanium pipe

At www.titaniuminfogroup.com, we strive to be the market leader in titanium production through our dedication to control and quality. We have invested heavily in governance and training.

We have invested in advanced equipment & advanced technology, including our own ERP management & QC system.

Each of our product orders undergoes extensive quality control and each comes with an independent third party testing and inspection report.

We have a large inventory stock to be able to satisfy order quickly and on time.

Problems and solutions in titanium tube processing

Defect name

Causes

Ways to
prevent or eliminate

Transverse
scratch on external surface

1. hole
opening is insuf
ficient.

2. the
location of the Ma Tai plate is incorrect.

3. the hole
opening is not smooth or the flange is too sharp.

1. increase
the opening degree of groove.

2., adjust the
location of the market.

3. repair
opening flange.

Longitudinal
scratches on external surfaces

1. the roll of
multi roll mill is not flexible.

2. roll and
pass asymmetry.

3. the outlet
is not smooth.

1. adjust
rolling mill, repair copper tile, adjust balance spring;

2. adjust the
pass;

3. repair
outlet.

Pipe end
cracking

1. the
plasticity of the metal is poor.

2. pass
through hole.

3. excessive
air reduction;

4. there are
serious defects in both ends of the billet.

5. the
clearance of the roll is too large.

1. reduce the
amount of deformation;

2. reduce hole
opening.

3. reduce the
null value.

4. remove the
defects of the tube billets to ensure that the ends are neat.

5. replace
roller bearings and adjust clearance.

The external
ellipticity is too large.

1. pipes do
not rotate.

2. the
finishing section of the pass or slipway is too short.

3. roll and
pass asymmetry.

4. roll and
pass wear seriously.

5. the
diameter of the roll bottom groove is different.

6. the height
of several slideways is inconsistent, or the position of adjusting the
diagonal iron is different.

1. adjust the
feeding mechanism;

2. increase
the length of finishing section.

3. replace or
adjust the pass;

4. replace the
roll and choose the same roll with the same diameter.

5. replace the
slideway and adjust the position of the diagonal iron, so that the positions
of the skew iron of each block are the same.

The outer
surface is rough and not smooth.

1. lubricants
are not suitable or lubricants are not clean.

2. the
clearance is too large.

3. pass and
roll sticky metal;

4. pass and
roll surface rough.

5. excessive
delivery.

1. replace
lubricants and keep lubricants clean.

2. adjust the
rolling mill and reduce the clearance.

3. repair or
replace pass and roll;

4. reduce
delivery.

Internal
surface abrasion

1. the surface of cores is sticky or defective.

2. the inner
surface of pipes is poorly lubricated.

3. the
adjustment of rolling mill is unreasonable.

1. repair or
replace the core;

2. strengthen
inner surface lubrication;

3. adjusting
rolling mill.

Inner surface
pit

1. the inner
surface of the billet is not clean.

2. the
location of the Ma Tai disk is incorrect, causing a string movement.

3. lubricants
are not clean.

4. slipway or
pass curve is not appropriate, causing local deformation too large and the
bonding core.

1. clean the
inner surface of the billet.

2. strengthen
inner surface lubrication;

3., adjust the
location of the market.

4. improvement
of slideway or pass curve design.

Ring
indentation

1. the opening
of the roll pass is not proper.

2. core
position is too close.

1. repair hole
opening;

2. adjust the
position of the core.

Uneven wall
thickness on the same cross section

1. the
deviation of tube wall thickness is too large.

2. the
rotation angle of the pipe is not suitable.

3. the pre
finishing section of the pass or slipway is too short.

4. the rolling
center line is not correct.

5. core or
guide rod bending;

6. the height
of the slideway is different, or the diameter of the roll neck is different.

1. improve the
quality of billet.

2. adjust the
rotation angle;

3. increase
the length of pre finishing section;

4. adjust the
rolling center line;

5. replace the
core or guide bar.

6. replace
slideway or roll (multi roll mill)

Dimension
overshoot

1. the
size of the core is incorrect or the position is not accurate.

2. the
clearance is too large or the pass wear is serious.

3. tool
manufacturing error.

1. adjust
clearance.

2. replace
Tools.

surface crack

1. the quality
of billets is not good.

2. excessive
variation.

3. inadequate
annealing or uneven annealing temperature.

1. repair and
inspect the tube billet seriously and improve the quality of the billet.

2. reduce
deformation.

3. re
annealing.

Metal or
non-metal pressing in

1. the end of
the tube blank has a puncture.

2. there is
metal on the pass, roll and core.

3. lubricants
are not clean.

4. inner and
outer surfaces of tube billets are not clean.

1. remove pipe
burrs;

2. regular
inspection and repair tools;

3. replace
lubricants;

4. scrub the
inner and outer surfaces of pipes.

wave

1. excessive
delivery.

2. the length
of the back cone is too short or the taper is too small.

3. the hole
finishing section is worn to cone type.

4. variant
size is too large and finishing section is too short.

1. reduce
delivery;

2. increase
the length or taper of the inverted cone after slideway.

3. replace the
pass;

4. improving
the pass design.

Flex press in

1. the opening
of the pass is too small.

2. part of the
pass wear is serious.

3. excessive
delivery or uneven delivery.

4. gap is not
suitable.

5. pipes do
not turn.

1. enlarging
hole opening.

2. replace the
pass;

3. adjust the
sending organization;

4. adjust
clearance.

5. adjusting
slewing mechanism.

Source: China Titanium Pipe Manufacturer: www.titaniuminfogroup.com

Summary
what is titanium pipe - What is titanium pipe?
Article Name
What is titanium pipe?
Description
Titanium pipe is light in weight, high in strength and excellent in mechanical properties. It is widely used in heat exchange equipment, such as tubular heat exchanger, coil heat exchanger, serpentine heat exchanger, condenser, evaporator and transmission pipeline.
Author
Publisher Name
www.titaniuminfogroup.com
Publisher Logo
PREV
NEXT

RELATED POSTS

Leave a Reply

*

*

  1. […] to the thin wall of titanium tube, the damage caused by tube vibration should be paid attention to when replacing copper alloy tube. […]

Inquery now

SUBSCRIBE TO OUR NEWSLETTER

FOLLOW US

YouTube
العربية简体中文繁體中文NederlandsEnglishFrançaisDeutschItaliano日本語한국어LatinPortuguêsРусскийEspañolTürkçe

Email me
Mail to us