Stainless Steel Seamless Pipes

Your Professional Stainless Steel Seamless Pipes Supplier

Established in 2009 as a national high-tech enterprise with 15 years of expertise in R&D, production, and sales of stainless steel pipe fittings and pipeline accessories.

Our popular product offerings primarily include butt welding pipe fittings, forged pipe fittings, stainless steel flanges, stainless steel pipes, and related components.

ASTM A312 TP316L Seamless Stainless Steel Pipes
Seamless STEEL PIPES: DN15-DN600 (½"-24")
Welded STEEL PIPES: DN15-DN1200 (½"-48")
Supports SCH5S-XXS pressure ratings, ideal for oil/gas pipelines and cryogenic applications.
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Stainless Steel Pipe
The actual size of seamless steel pipes may vary depending on the manufacturer and specific standards. In addition, there are some non-standard sizes available for special needs.
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Why Choose us

Advanced Production Equipment

We utilize specialized equipment for precision cutting, forming, welding, heat treatment, and surface finishing. Examples include heat treatment furnaces, large hydraulic press machines for manufacturing tees and reducers, laser cutting machines for pipes, high-power fiber laser cutting machines for plates, and elbow cold forming machines, among others.

Quality Control

Our quality and safety management systems are certified under ISO 9001:2015, API Q1, ISO 45001 (OHSMS), and ISO 14001 (Environmental Management System), ensuring compliance with international standards.

Specialized Workshops

We maintain a fully equipped physical and chemical laboratory, along with a dedicated inspection workshop, to support comprehensive quality assurance and control processes.

Parameter

DN15	Outer diameter: 21.3	Wall thickness: 2.8, 3.0, 3.2, 3.5, etc.
DN20	Outer diameter: 26.9	Wall thickness: 2.8, 3.0, 3.5, 4.0, etc.
DN25	Outer diameter: 33.7	Wall thickness: 3.2, 3.5, 4.0, 4.5, etc.
DN32	Outer diameter: 42.4	Wall thickness: 3.5, 4.0, 4.5, 5.0, etc.
DN40	Outer diameter: 48.3	Wall thickness: 3.5, 4.0, 4.5, 5.0, etc.
DN50	Outer diameter: 60.3	Wall thickness: 3.8, 4.0, 4.5, 5.0, etc.
DN65	Outer diameter: 76.1	Wall thickness: 4.0, 4.5, 5.0, 6.0, etc.
DN80	Outer diameter: 88.9	Wall thickness: 4.0, 4.5, 5.0, 6.0, etc.
DN100	Outer diameter: 114.3	Wall thickness: 4.0, 4.5, 5.0, 6.0, etc.
DN125	Outer diameter: 141.3	Wall thickness: 4.5, 5.0, 6.0, 8.0, etc.
DN150	Outer diameter: 168.3	Wall thickness: 4.5, 5.0, 6.0, 8.0, etc.
DN200	Outer diameter: 219.1	Wall thickness: 6.0, 8.0, 10.0, 12.0, etc.
DN250	Outer diameter: 273.0	Wall thickness: 6.0, 8.0, 10.0, 12.0, etc.
DN300	Outer diameter: 323.9	Wall thickness: 8.0, 10.0, 12.0, 14.0, etc.
DN350	Outer diameter: 355.6	Wall thickness: 8.0, 10.0, 12.0, 14.0, etc.
DN400	Outer diameter: 406.4	Wall thickness: 8.0, 10.0, 12.0, 14.0, etc.
DN450	Outer diameter: 457.0	Wall thickness: 8.0, 10.0, 12.0, 14.0, etc.
DN500	Outer diameter: 508.0	Wall thickness: 10.0, 12.0, 14.0, 16.0, etc.
DN600	Outer diameter: 610.0	Wall thickness: 10.0, 12.0, 14.0, 16.0, etc.

Benefits of Stainless Steel Seamless Pipes

Corrosion resistant: Stainless steel seamless pipes have excellent corrosion resistance and can be used stably for a long time in acid and alkali environments. Because its main component contains chromium, it forms a dense oxide film, which can effectively prevent the metal from coming into contact with the external environment and avoid corrosion. In addition, stainless steel seamless pipes can maintain stable performance under harsh conditions such as high temperature, high pressure, and high speed, and are suitable for various industrial fields.

Strength and high temperature resistance: Stainless steel seamless pipes have high strength and high temperature resistance, and can withstand greater pressure and temperature. The material itself has good mechanical properties and is not easy to deform or break. At the same time, the high temperature resistance of stainless steel seamless pipes enables it to be used in high temperature environments. There will be no oxidative expansion, ensuring the safety and reliability of the pipeline.

Aesthetics: The surface of stainless steel seamless pipe is smooth and beautiful, which is suitable for decoration, construction and other fields. Stainless steel seamless pipe is not easy to rust, has good stain resistance, and can keep clean and bright for a long time. Therefore, it is often used to make furniture, interior decoration and artworks.

ASTM A312 TP316L Seamless Stainless Steel Pipes

Application of Stainless Steel Seamless Pipes

Piping systems: Stainless steel seamless pipes find extensive use in piping systems for industries such as petrochemical, chemical, and oil and gas. The seamless construction ensures reliable and leak-free fluid transportation.

Heat exchangers: The seamless nature of these tubes makes them ideal for heat exchanger applications. They can withstand high temperatures and pressure, making them crucial for efficient heat transfer in various industrial processes.

Automotive industry: In the automotive sector, stainless steel seamless pipes are employed for manufacturing exhaust systems. Their resistance to corrosion and high temperatures makes them a durable and reliable choice.

Aerospace applications: The aerospace industry relies on stainless steel seamless pipes for applications that demand lightweight yet robust components. These tubes provide the required strength and corrosion resistance for aerospace structures.

Instrumentation and hydraulic systems: Stainless steel seamless pipes are widely used in instrumentation and hydraulic systems due to their ability to handle high pressure and corrosive environments with ease.

Oil and gas industry: Stainless steel seamless pipes find extensive use in the oil and gas sector for conveying fluids and gases under high-pressure conditions. Their corrosion resistance is crucial in preventing degradation over time.

Chemical processing: Chemical plants rely on stainless steel seamless pipes for the transport of corrosive chemicals. The seamless construction minimizes the risk of leaks and ensures the integrity of the chemical processes.

Manufacturing Process of Stainless Steel Seamless Pipes

Heating

The whole manufacturing process begins with the first heating process. Before you can dent the massive steel billet, you’ll have to run it through a furnace at around 1,200°Celsius. This extreme temperature softens the steel without melting it. What comes out of the furnace is a glowing hot steel that’s malleable enough for the next steps.

Extrusion

Industrial rotary tools pierce through the blazing billet to create a hollow shell. The elongation process passes the shell through a series of heavy-duty rollers. This then forms the pipe’s initial shape and size to work on.

Hole Expansion

While expanding the hollow tube, the workers will continue forcing a mandrel into it. This step is crucial to secure a smooth internal diameter and uniform wall thickness. Mandrel milling involves continuous rolling and stretching to the desired dimensions.

Cooling

After realizing the ideal size and dimensions, the pipe is gradually cooled. This cooling process happens in a controlled environment to avoid thermal stress. It also helps maintain the pipe’s integral mechanical properties. The complete cooling of the tube marks the solidification of the pipe in its final diameter.

Straightening

The prior steps do not guarantee complete success in crafting a perfect pipe. Even after cooling, there will be distortions and bends. Hence, the pipes still need to run through a straightening machine. Rollers or a straightening machine will apply controlled pressure to align the pipe. This ensures the final product is geometrically accurate and usable.

Post-Processing

Post-processing may include surface polishing, threading, or heat treatment for enhanced properties. Workers can also add a surface coating to guard against abrasion and corrosion. This step ensures the pipe meets specific application standards.

Quality Control

Quality control checks the pipe for dimensional accuracy, strength, and surface defects. Safe testing mechanisms, including X-ray and ultrasonic inspections, ensure flaw-free pipes. The pipe undergoes final inspection before shipment.

Delivery Information

Shipping Methods:

We offer a variety of shipping options, including sea freight, air freight, railway transportation, and international express delivery, to meet the diverse needs of our customers.

Estimated Delivery Time:

We will provide you with the estimated delivery time for your order, which will be clearly stated in the formal order to ensure your rights are protected, allowing you to arrange for the receipt of your goods in a timely manner.

Order Tracking:

We provide order tracking services, allowing you to stay informed about the current status and expected arrival time of your order. Detailed inspection information and shipping manifests, including photos and videos, are provided to ensure the security of your transactions.

FAQ

Q: What is seamless stainless steel pipe?

A: Seamless pipes are derived from solid steel that is in sheet or bar form and is formed into a solid round shape known as “billets” which are then heated and cast over a form such as a piercing rod to create a hollow tube or shell.

Q: Which is better seamless or welded SS pipe?

A: Of the two processes, seamless tubing is generally considered to be stronger and more durable because it lacks the structural weaknesses that weld seams can introduce. It is often preferred for applications where high pressure or high-temperature conditions are involved.

Q: What is the lifespan of a seamless pipe?

A: The typical lifespan of Stainless Steel 304 Seamless Pipes can range from 20 to 50 years, depending on the factors mentioned above. In environments where the pipes are exposed to moderate conditions and well-maintained, they can even exceed the 50-year mark.

Q: What are the grades of stainless steel seamless pipes?

A: There are three main Stainless Steel grades – 304, 316, and 317. Each grade has its own unique properties which make them ideal for different applications. When choosing SS pipes, it's important to consider the application as each grade has unique properties that make them suitable for different uses.

As one of the leading stainless steel seamless pipes manufacturers and suppliers in China, we warmly welcome you to buy high quality stainless steel seamless pipes made in China here from our factory. Good service and punctual delivery are available.

ASTM A312 TP316L Seamless Stainless Steel Pipes, Stainless Steel Pipe, stainless steel seamless pipes