Pipe made of titanium
Titanium pipe is a product with various hollow sections. It can be made of single, random or multiple to single length. The properties depend on a method of manufacture, chemical composition, material condition. A sample capture for chemical analysis inspection complies with GOST 24 231−80. By a method of manufacture, pipes are divided into hot-rolled (undergo mechanical treatment by external and internal diameter) and cold-rolled (welded and seamless). Every method has its advantages. F. e. welded pipes are made of following grades according to standard 24 890−81, 19 807−74 gost ОТ4−0, grade 2. They are usually manufactured of strip with a help of hand argon-arc welding. Seamless cold-deformed pipes are manufactured of grades gost PТ-7M and titanium grade 2 according to GOST 22 897−86,19 807−74 and IS 1 90 050−72.
By a quality, titanium pipe can be divided into a group with pickling treatment in annealed condition, and a group without heat and pickling treatments. An outer surface must not have cavities, laminations, scabs, flaws, heavy grinding pits, deep grooves and lack of penetration. Butts are cut at a right angle and trimed from barbs.
It possesses high strength, corrosive resistance, softness, satisfactory workability, good plasticity and weldability. All properties are kept even under effect of ultra-low and high temperatures. It also possesses a resistance:
— in sea, brine, fresh water;
— in sulphuric, SO2, commercial gas atmosphere;
— in contact with nitric acid;
— in environment of natural gas and oil products;
— in mixture of KOH and NaOH with concentration of 40%;
— in boiling ammonia environment with concentration of 20%;
— in molten sulfur up to 240 °C;
— in salts of cupric sulphate, sodium carbonate, H2 S etc. It possesses a resistance in dichloracetic, glacial concentrated acetic acid, in chloro-acetic, milk acid, acetic anhydride, tartaric acid at a temperature of up to 100 °C.
|Grade||Diameter||Wall thickness||Method of manufacture||Unit measure||Cost|
|Titanium gost OT4−0||6 mm||6 mm||seamless||kg||negotiated|
|Titanium grade 1||16−140||16 — 140 mm||---«---||---«---||negotiated|
|Titanium gost PT-7M||13−110||1.5 — 6 mm||---«---||---«---||negotiated|
Titanium pipe is widely used in the most responsible areas of modern manufacture: in submarine shipbuilding, jet propulsion, oil-chemistry, at well-sinking, at gas and oil output. It easy copes with difficult tasks that are unbearable for other metals. Titanium pipe is consistent and soft; resistant to effect of chemicals and corrosion. It is much-requested in gas and oil output, in development of offshore fields, in deep-water geological explorations. There are two types of pipes: cold-rolled and hot-rolled. After rolling, it undergoes mechanical operation. It possesses a resistance to aggressive environment and temperature differential in a range of -250°С +450°С. It is invaluably in chemical industry. Significant real resistance and non-magnetization of titanium grade 2 make it popular in radio-electrotechnics. Pipe of grade OT is used more rarely. It is also low-exposed to effect of salts, moisture, temperature differential. It is utilized in petrochemical and gas industry.
|Alloy||Percent elongation (%)||Rupture strength|
|Titanium gost PT-1M||25||35 — 58 kgf/mm²|
|Titanium grade 1||20||30 — 45 kgf/mm²|
|Titanium gost PT-7M||24||45 — 68 kgf/mm²|
|Titanium grade 2||15||40 — 55 kgf/mm²|
Welded titanium pipe is made of titanium grade 2, gost ОТ4−0 according to GOST 24 890−81, 19 807−74. They are usually made of strip with a help of argon-arc welding. Seamless cold-deformed pipes are made according to IS 1 90 050−72, 22 897−86, GOST of grade 2 or gost PТ-7М.
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