Home > Products > Seamless steel pipe/tubes

Precision cold drawn seamless steel tube

Cold Drawn Seamless tubes offer tight tolerances compared to Hot Finished Seamless tube, and offers stronger physical properties compared to other mechanical tubing.

Precision cold drawn seamless steel tube
Cold Drawn Seamless tubing (also known as CDS).
Precision cold drawn seamless steel tube
Measurment the out diameter

+ DIN 2391
Cold Drawn Seamless Carbon Steel Tube ASTM A179
+ ASTM A179
Precision cold drawn seamless steel tube
+ Double tube

General process of cold drawing

A considerable proportion of the seamless tubes and pipes manufactured through the cold roll piercing technology undergo subsequent cold forming.

The principal reasons behind cold drawing are:

Cold drawn seamless steel tube process

Cold drawn steel tube is with hot-rolled steel coil as raw material, and tandem cold rolling pickled to remove oxide scale, its finished rolling hard roll, rolling hard volumes due to the continuous cold deformation caused by cold hardening strength, hardness increased indicators declined tough plastic, stamping performance will deteriorate, which can only be used for simple deformation of the parts.

Cold formed steel

Cold-formed steel refers to the use plates or strip bent in a cold state of the various cross-sectional shape of the finished steel. Cold-formed steel is an economical lightweight thin-walled steel cross-section, also called cold-formed steel profiles. Bending section steel is the main material of light steel structure. It has a hot rolling can produce all kinds of thin, reasonable shape and complex cross section.

Hot forging and cold forging

Hot forging means forging blank metal above the recrystallization temperature carried out.

Cold forming performance

Cold forming is not performed in the case of heating the material for punching, bending, stretching and other processing methods. Cold forming processes are cold heading, cold rolled, forging and so on.

The advantages of cold-rolled tube

Cold-rolled tube refers to steel product that is through cold drawing, cold-formed, cold drawn, cold plate or strip processed at room temperature.

The measures to prevent precision cold drawn pipe cold crack

Welded pipe has welded joints rigid, multi-layer welding, welding metal bulky, so welded joints in high-stress state, such as the weld metal has a higher yield point, it is difficult to relaxation through its plastic deformation of welded joints of high stress , then weld cracking in the heat affected zone is easy white zone or zones produce martensite formed HAZ cold cracking.

Annealing and quenching of cold drawn steel

The annealing of cold drawn steel is commonly used in the production of preliminary heat treatment process. The annealing of cold drawn steel is commonly used in the production of preliminary heat treatment process.

Cold drawn steel pipes Elongation and reduction of area

Cold drawn is a process material, for the metal material, referring to the drawing in order to achieve a certain shape and a certain mechanical properties, the material is under room temperature conditions for drawing. Cold drawn products compared to thermoforming: high dimensional accuracy and good surface finish advantages.

Application of ASTM A179 Cold Drawn Seamless Tubes

ASTM A179 cold drawn seamless carbon steel pipe is mainly used in various sectors of the metal structure facilities, mainly after the rust of steel pieces immersed in 440 - 460 ℃ melting zinc solution, so that the steel surface attached to the zinc layer, which play a preservative purpose.

Difference between hot rolled and cold formed steel

Cold drawn is a process material, for the metal material, referring to the drawing in order to achieve a certain shape and a certain mechanical properties, the material is under room temperature conditions for drawing. Cold drawn products compared to thermoforming: high dimensional accuracy and good surface finish advantages.

Weld cold crack

Welded joints cooled to a lower temperature ( for steel, in the martensitic transformation start temperature Ms less ) generated by the weld cracking.

Precision cold drawn steel tube production process
+ Precision cold drawn steel tube production process

CDS is popular in the hydraulics, being used to make hollowed chrome plated telescopic cylinders and hydraulic rods. It is also popular for large bore, heavy walled, high pressure hydraulic cylinders. Cold Drawn Seamless tubes also find uses in heavy equipment manufacturing such as cranes and garbage trucks.

  • Achievement of closer wall thickness and diameter tolerance
  • Improvement in surface finish
  • To enhance serviceability
  • No premature failure
  • Suitable for critical forming Such as 180˚ Bends
  • Enhancement of mechanical properties of the tube
  • Expansion of product mix towards the lower end of the OD and wall thickness scales.

THERE ARE THREE BASIC PROCESSES EMPLOYED FOR THE COLD DRAWING OF TUBE:

  • Hollow drawing
  • Stationery drawing or floating plug drawing and
  • Drawing over a mandrel (also known as drawing on-the-bar)
Annealing

After the goods are cold drawn to sizes, the tubes are put on annealing furnace for heat treatment and normalising.

Straightening

Post annealing, the goods are passed through a seven roller straightening machine to achieve proper straightening of the tubes.

Eddy current

Post straightening, each tube is passed through eddy current machine to detect for surface cracks and other defects . Only the tubes that pass eddy current are fit for delivery to customers.

Finishing

Each tube is either oiled with corrosion resistant oil or varnished for surface protection and corrosion resistant as per customers requirement, each tube end is covered by plastic end caps to avoid damage in transit, the marking and specs are put and the goods are ready for dispatch.



English Inglés SpanishEspañol

此页面上的内容需要较新版本的 Adobe Flash Player。

获取 Adobe Flash Player

Recommended products
Pipe fittings
Pipe fittings are used to connect pipes.
Welded steel pipes Weld steel pipes
We produce an extensive selection of weld steel pipe
Welded steel pipes Anti corrosion pipe
Anti-corrosio pipe is processed through the preservation
Ceramic-Lined Pipes
from a single spool piece to complete piping systems.
Pipe flanges
Pipe flange are a method of connecting pipes, valves.
Pipe Fitting Accessories
We are passionate in Stub Ends, Bolt Sets, Fasteners
Sunny Steel Blog


About Sunny Steel

Our team are highly trained and experienced in servicing and producing all types of steel supplies. Whether you've got a large construction project, or need parts for industrial machinery, our team of steel fabrication consultants will ensure that your project is provided with the parts you need, when you need them.