Seamless Tubes

Petrosadid: Seamless Tubes

PETROSADID is a leading supplier of seamless tubes providing an extensive selection of all grades and dimensions to the oil & gas, petrochemical, chemical and power industries. We work closely together with certified tubes manufacturers from around the world and have a huge range of different seamless tubes constantly on stock ranging from Hot Rolled to Cold Drawn.

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The seamless tube will ideally be a solid metal tube with each end connected to another tube without having any welding joint. These tubes have threads either at one end or at both ends and can be threaded to the end of another hollow tube.

Seamless tubes are finished in accordance with customer needs regarding dimensional and wall thickness specifications as well as heat treatment for more demanding applications.

In the production of steel tubes, steel is molded and reshaped with different machinery at different temperatures. One of the steel manufacturing processes is steel rolling, which involves metal stock passing through a pair of rolls. Rolling produces flat steel sheets of a specific thickness, and the process is classified according to the temperature at which the metal is rolled. If the temperature of the metal is above its recrystallization temperature, or the temperature at which the grain structure of the metal can be altered, then the process is termed as hot rolling. If the temperature of the metal is below its recrystallization temperature, the process is termed as cold rolling.

Cold Drawn Seamless Tube

Cold drawn seamless tube is usually required where the end product is either safety and/or quality critical.

The method for making cold-drawn seamless tubes involves taking a round "billet" or bar of steel and boring it in the center, turning it, cutting it, heating it to make it more pliable, then "drawing" it (extruding or pulling it) to make it a longer and thinner tube. As the tube cools, "cold working" begins. Cold working involves pulling the tube over a stationary die and a mandrel. This increases the tube's hardness and improves its surface condition and grain structure while reducing the tube to the desired size and thickness.

Cold drawn tube has a number of advantages compared to Electric Resistance Welded (ERW) tube and Hot Finished Seamless Tube (HFS) such as:

1. Higher strength & hardness properties

cold drawing increases the strength of the tube therefore making it very suitable for safety and performance critical applications.

2. Size accuracy

due to the nature of the manufacturing process drawn tubes can be manufactured to close dimensional tolerances, achieving consistent diameter and thicknesses throughout.

3. Enhanced appearance

cold drawn seamless tube usually has a shinier look with no weld lines increasing the aesthetics of the products in which it is incorporated.

4. Easier to machine

due to the superior strength and hardness of our tube, it produces a better machined surface and therefore a better looking component for our customers.

5. More precise and cost effective bending

cold drawn tube allows for more precise bends which can also be achieved with less set up time and consequent adjustments.

6.Superior finish in subsequent manipulations

as cold drawn tubes have a glossier, no-seam finish they also produce end better end products from processes such as dipping, etching and anodizing

Petrosadid: Seamless Tubes

Hot-Rolled Seamless Tube

Different from cold rolling which is performed below the recrystallization temperature, hot rolling is conducted above the temperature. Hot rolled seamless pipes offer higher torsional rigidity than cold rolled ones, thus it offers better torsional resistance than cold rolled tubes.


Hot rolled seamless steel pipe can damage the cast microstructure of the steel ingot, refinement of the crystal grains of the steel, and eliminate the defects of the microstructure, so that the the steel organization compacting, improve the mechanical properties. This improvement is reflected in the rolling direction, so that the steel is no longer to a certain extent isotropic; pouring the formation of bubbles, cracks, and osteoporosis, under high temperature and pressure can also be welded together.


• After the hot rolling, the nonmetallic inclusions in the interior of a steel (mainly sulfides and oxides, as well as the silicate) was pressed into a sheet, stratified (laminated) phenomenon appears. The layering of the steel in the thickness direction by the pull performance deteriorated significantly, and may appear in the weld shrinkage interlayer tear. Weld shrinkage induced local strain often reach several times the yield point strain, the strain is much greater than the load caused;

• Residual stress caused by uneven cooling. The residual stress is the stress of internal self-phase equilibrium in the absence of external force, the hot-rolled steel of various cross-sectional has a residual stress such Usually steel sectional dimension is the greater, the greater the residual stresses. Residual stress is self-phase equilibrium, but the steel members in the performance external force or have a certain influence. Such as deformation, stability, anti-fatigue may adversely.

• Hot-rolled steel products, poor control of thickness and edge width. We are familiar with the thermal expansion and contraction, even if the beginning of the hot-rolled out are standard length, thickness, or there will be some negative final after cooling, this negative differential edge width wider the increasing thickness of the performance of the more obvious.

Petrosadid: Seamless Tubes


• The cold rolled seamless tube allows local buckling, which can make full use of bending bearing capacity. While, hot rolled steel does not allow local buckling.

• The causes of residual stress are different, so the distribution of the cross section is also very different. The distribution of the residual stress on cold rolling thin wall steel is bending. However, the distribution of the residual stress on hot rolled steel is film type.

• The free torsional rigidity of hot rolled steel is higher than that of cold rolled steel. In other words, the torsion resistance of hot rolled steel is better than that of cold rolled steel.


Seamless Tubes are applied in more harsh environments and are supplied to a variety of industries with corrosive media, high and ultrahigh temperatures & pressures, other aggressive conditions. Key application areas of PETROSADID products are chemical and petrochemical engineering, mechanical engineering and power generation, including nuclear.

Hydraulic & Instrumentation Tubes are important components in hydraulic and instrumentation systems to protect and partner with other components, devices or instruments to secure the safe and trouble-free operations of oil and gas plants, petrochemical processing, power generation, onshore control panels, topside processing facilities and subsea manifolds in oil and gas industry; high purity tubes for semiconductor industry, fuel rods, control tubes for advanced engineering; cooling circuits, brake cylinders for automotive industry and other critical industrial applications. Consequently, demand on the quality of tubes is very high

Petrosadid: Seamless Tubes

Petrosadid supplies heat exchangers tubes for several critical applications which require high corrosion resistance materials and highest quality standards to be maintained. Some of these applications include condensers, coolers, evaporators, heaters in Refinery, Petrochemical, Chemical, Oil and Gas, Organic and Inorganic acids, Hydro metallurgy, Power generation and Desalination.

Heat-exchanger tubes are designed for heat transfer and mostly applied in the processes like heating, cooling, ventilation, condensation and evaporation (of liquids, gases, steam and their mixes). Heat-exchanger tubes are used in the following types of equipment:

• Shell & tube heat exchangers,

• Plate & frame heat exchangers,

• Cooling towers,

• Air coolers.

Main industries of heat-exchanger tubes application are chemical & petrochemical, power generation (including nuclear), oil & gas and others (food & beverage, pulp & paper, transportation, etc.)

Petrosadid: Seamless Tubes

The tube manufacturing range covers all main grades used for heat corrosion and oxidation resistance applications. Stainless and nickel grades are traditionally used in re-heater and super-heater though they may also be required in other parts of the plant.

Their outstanding properties make them the correct choice for our customers when searching for materials in advanced equipment's.

Boiler tubes are applied in thermal power-generation and heating as a part of tubing components of utility and industrial boilers. Boiler tubes in power-generation are used only for utility boilers to generate steam for electricity production. Boilers for industrial applications produce steam or hot water for process applications for various industries-biomass firing (fluidized bed boilers), heating, pulp and paper industry (recovery boilers), and waste to energy plants, various chemical processes.

Petrosadid: Seamless Tubes

Furnace or heater tubes are mainly used in petrochemical industry as process tubes in cracking furnaces for refineries and ethylene\propylene plants. Oil refinery cracking processes allow the production of «light» products such as liquefied petroleum gas (LPG). In a typical ethylene furnace the pyrolysis reaction is endothermic. For this reason, furnace tube material must be suitable to accommodate the high process temperature.

Petrosadid: Seamless Tubes

General tubes are used as piping components or line pipes for variety of industries:

Chemical, petrochemical, oil and gas, power generation, processing, food & drink, metallurgy, and others. In subsea media general tubes & pipes can be used as line pipes, flow lines, risers, hydraulic & gas injection lines, etc. In topside media general tubes & pipes can be used as utility and process piping, sea water piping systems, LNG piping.

Petrosadid: Seamless Tubes

Hollow bar – also called the seamless mechanical tubing, – is a tubular product made with properties and characteristics suitable for subsequent transformation into a numerous cylindrical components and hollow products for different engineering purposes. Applications of hollow bar include aerospace, electronics, medical, military, food processing, transportation, chemical and petrochemical industry. Hollow bars are widely used in general engineering industry.

Also Stainless steel hollow bar in a wide range of sizes and grades. Our program of hollow bar includes several grades of austenitic stainless steel as well as duplex stainless steel.

Petrosadid: Seamless Tubes

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