Seamless tube, Seamless pipes, Cold drawn seamless tube, Hot rolled steel pipe
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Seamless steel pipes / tubes

Seamless steel pipe, as the name suggests, is a pipe without a seam or a weld-joint. Seamless steel pipe is a tubular section or hollow cylinder, usually but not necessarily of circular cross-section, used mainly to convey substances which can flow — liquids and gases (fluids), slurries, powders and masses of small solids.

The production of our seamless pipes is tightly regulated and all of the pipes we stock have been fully tested to international standards to ensure we only supply the highest quality products.

+ Big Out diameter seamless pipes

Structure engineering

+ Seamless Pipes by applications

Carbon Steel Seamless Pipes

+ Carbon Steel Pipes


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Our highly-skilled manpower is dedicated to producing the finest quality steel pipe, pipe fittings, meeting a wide variety of material specifications.

Please view the recommended seamless pipes and tubes as below:

Boiler pipes
ASTM Seamless pipe
ASTM Standards can be purchased as a digital library subscription or individually from ASTM and other qualified standards providers.
DIN 17175 seamless steel pipes
Tubes/pipes for DIN/EN
Our steel tubes/pipes for DIN/EN Standard and preferential price have won us customers' trust and consistently favorable comments.
Boiler pipes
Boiler tubes
Boiler tubes need to withstand high pressure and temperature.
Tubes for Fluid Transportation Service
Tubes for ship building
The Seamless steel pipe for ship building usage are mainly used for Level 1& Level 2 pressure pipe in piping system, boiler and super-heated unit of shipbuilding.
Tubes for Fluid Transportation Service
U-bend tubes
Stainless Stee pipes/ tubes
Tubes/pipes for JIS Standard
JIS seamless pipe is steel pipe that has been created by JIS and meets certain performance requirements.
Stainless Stee pipes/ tubes
Stainless Stee pipes/ tubes
Stainless steel tubing is typically measured by its outer diameter and can be used in a variety of applications including a number of structural applications.
Seamless Precision steel tubes
Seamless Precision tubes
Seamless Precision Steel Tubes according to EN 10305-1
Mechanical tubes
Seamless Steel Tubes for Mechanical and Automobile usage for Backbone of Automobile and rear axle tube, manufacturing and processing of precision equipments, instruments and apparatus.

GOST 633-80
GOST 633-80 standard applies to seamless steel tubing smooth and couplings, with upset ends and couplings are smooth vysokogermetichnye and couplings, as well as flush-joint pipe with upset ends, used for the exploitation of oil and gas wells
Boiler pipes
Heat exchange tubes
Heat exchange tubes are intended for heating or cooling process fluids, they are for example suitable for closed circuit cooling of electrical equipment using demineralised water and for cooling water soluble oil solutions in quenching tanks.
Bi Metal Clad flanged pipe
Bi Metal Clad flanged pipe
Bi Metal Clad flanged pipe is cast with mold vanishing vacuum suction casting cladding process. Outer of straight pipe is common steel pipe, cladding realized by forming high chromium lining via centrifugal forming technique.
Rare Earth Alloy Wear-resisting Casting Pipe
Rare Earth Alloy Casting Pipe
My company and major universities jointly developed a new type of high-strength wear-resistant alloy of rare earth products, it is crucial to overcome the technical material of cold, heat, cracking, brittleness, deformation, etc.

Rare earth alloy wear-resistant high chromium cast iron pipes
Rare earth alloy wear-resistant high chromium cast iron pipes
Rare earth alloy wear-resistant high chromium cast iron pipe is a high-strength low-alloy rare earth heat...


Tech & Service of Seamless pipe

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.

How to make seamless pipe(seamless pipe process)?
Hot Piercing Workshop
Piercing process
The cross roll piercing and pilger rolling process in the size range from approx. 250 to 660 mm outside diameter.
Precision cold drawn steel tube production process
Pipe weld cracks
often follow different mechanisms can be divided into two types of thermal cracking and cold cracking.
How to calculate a steel pipe and tube theoretic weight
Calculate a steel pipe?
Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe.
Pipe beveling
Pipe beveling is the process where an angle is formed between the edge of the end of a pipe or tube and a plane perpendicular to the surface.
Steel pipe cutting machine
Pipe cutting
Cutting tools have a grinding wheel piece cutting machine (also known as toothless saw), hand saw, cutter and other hand tools.
How to calculate a steel pipe and tube theoretic weight
Packing the steel pipes
There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method.
 
Condition on delivery:
Term Symbol Explanation
Cold-finished/hard
(cold-finished as-drawn)
BK No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft
(lightly cold-worked)
BKW After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
Annealed GBK After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
Normalized NBK The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.



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.

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