SS Seamless pipes are manufactured by heating and piercing a solid billet into a hollow shell, then passing them through hot-working and cold-drawing to get the precise dimensions. The next step is to perform solution annealing to relieve internal stresses while optimising corrosion resistance and mechanical properties. The last step is pickling and straightening before the pipes are sent for testing.
Stainless Steel Seamless Pipes Manufacturer
We are Xintongda Special Steel (XTD), a trusted manufacturer and supplier of stainless steel seamless pipes located in Songyang, China. A stainless steel seamless pipe is known for its high strength, good stability at high temperatures, and high corrosion resistance. Our seamless ss pipe complies with ASTM A312, EN, JIS, and GB standards. We manufacture this SS SMLS pipe by hot working and cold drawing a hollow SS shell over a mandrel.
We offer various grades of seamless SS pipe, like 304, 304L, 309, and 310. These pipes are suitable for use in oil & gas, chemical & petrochemical, power generation, sugar industry, etc., where the components are exposed to high heat, harsh chemicals, and other corrosive fluids. The pipes are also available in different sizes, thicknesses, and custom lengths.
Here at XTD, one of the leading stainless steel seamless pipe suppliers, we have been producing the highest quality of stainless steel pipes since 1985. As a multiple international certified company, we have high-end production facilities that help us to supply 25,000 tons a year.
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Standard
ASTM A312
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OD Range
6 - 1016 mm
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Thickness
1 - 65 mm
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Length
≤ 18 m
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What is a Stainless Steel Seamless Pipe?
A Seamless Stainless Steel Pipe is a high-strength tubular product made of stainless steel material. It is made from a solid billet of stainless steel without any welds. The seamless SS pipe mainly consists of iron and chromium, with other added elements such as nickel, carbon, molybdenum, sulfur, manganese, etc. The seamless nature of this pipe ensures uniform strength and wall thickness, more toughness, and integrity. It can resist localised corrosion, oxidation, and stress corrosion cracking.
Top Features of Seamless Stainless Steel Pipes
The seamless austenitic stainless steel has 8 main characteristics that make it stand out:
- Superior Corrosion Resistance: Stainless steel usually has a good amount of chromium, which forms a layer of chromium oxide when exposed to oxygen at high temperatures and helps the pipe prevent oxidation. Some grades also have molybdenum to resist pitting and crevice corrosion.
- High Mechanical Strength and Toughness: The seamless SS pipe is made by piercing and rolling a solid billet into a hollow shell. Due to this process, the pipe gets a uniform finish and a refined grain structure.
- Microstructural Stability: Many austenitic grades of the SS seamless pipe have stable crystal structures across wide temperature ranges. Their nickel and chromium content helps maintain austenite at room temperature and prevents phase changes or brittleness.
- High Pressure & Temperature Capability: The stainless seamless steel pipe has high pressure capability and good temperature strength (depending on grade) due to its seamless nature, which helps it withstand creep and deformation.
- Resistance to Extreme Environments: The chemical composition (chromium, nickel, molybdenum, etc) helps the alloy resist aqueous corrosion, oxidation, scaling at high temperatures, and stress corrosion cracking.
- Dimensional Precision and Surface Quality: The hot-working and cold-rolling/ cold-drawing manufacturing steps result in dimensional precision and good surface finish.
- Hygienic, Non-Reactive & Easy to Clean: The surface of this stainless seamless pipe is non-porous and smooth, which is why it is easy to clean and maintain.
- Weldability and Formability: The ductile austenitic structure of many SS seamless grades makes them easy to bend, form, and fabricate various piping configurations.
Material Grades of Austenitic Stainless Steel Seamless Pipes
We at Xintongda provide a wide range of austenitic stainless steel grades for seamless pipes. All of these are made from the austenitic structure, which is generally non-magnetic and resists corrosion very well. It has good weldability and formability, and can even perform well in temperatures up to 1500°F (depending on the grade).
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Stainless Steel 304 Seamless Pipe
SS 304 seamless pipe is commonly known as 18/8 pipe because it has 18% chromium and 8% nickel. It is a durable, corrosion-resistant pipe widely used in food processing, petrochemical and general industrial piping applications.
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Stainless Steel 304L Seamless Pipe
SS 304L seamless pipe is a low-carbon version of 304 and is designed to resist carbide precipitation during welding, thereby reducing the risk of intergranular corrosion.
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Stainless Steel 309 Seamless Pipe
SS 309 seamless pipe is a heat-resistant tubular product consisting of a high amount of chromium and nickel. It has good oxidation resistance and high-temperature strength.
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Stainless Steel 310 Seamless Pipe
The 310 seamless pipe has approximately 24-26% chromium and 19-22% nickel, which helps it provide superior corrosion and oxidation resistance. SS 310 can resist oxidation up to 2000-2100°F, but continuous service is typically rated at 1150°C (2102°F) for intermittent and lower for continuous
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Stainless Steel 310S Seamless Pipe
310S seamless pipe is the low-carbon version of 310 stainless steel, developed to improve resistance to carbide precipitation after welding. Its high chromium and nickel content provides excellent oxidation resistance and structural stability at elevated temperatures, making it more suitable for high-temperature service than grades such as 304 and 309.
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Stainless Steel 310MoLN Seamless Pipe
This is a fully austenitic stainless steel pipe. 310MoLN primarily consists of low carbon and high nitrogen content, which stabilises and strengthens the austenitic phase. This helps the pipe prevent intergranular carbide precipitations.
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Stainless Steel 314 Seamless Pipe
The 314 seamless pipe contains high chromium and increased silicon content, which provide excellent oxidation and scaling resistance at elevated temperatures, with service capability up to approximately 2102°F (1150°C).
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Stainless Steel 316 Seamless Pipe
316 seamless pipe has 2-3% molybdenum, which helps prevent pitting and crevice corrosion.
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Stainless Steel 316L Seamless Pipe
Compared to 316, the 316L seamless pipe has a low amount of carbon to resist intergranular corrosion and carbide precipitation.
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Stainless Steel 316LN Seamless Pipe
The 316LN seamless pipe is very similar to the 316L, with the only difference being the added amount of nitrogen. The nitrogen element increases the alloy’s tensile and yield strength and stabilises the austenitic structure.
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Stainless Steel 316Ti Seamless Pipe
The addition of titanium in 316Ti seamless pipe stabilises carbon by forming titanium carbides, which helps prevent sensitisation and intergranular corrosion, especially at elevated temperatures.
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Stainless Steel 317 Seamless Pipe
Stainless steel 317 seamless pipe is an austenitic chromium–nickel–molybdenum alloy with higher molybdenum content than 316, providing improved corrosion resistance. It offers good strength and toughness for moderately elevated-temperature and corrosive environments.
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Stainless Steel 317L Seamless Pipe
SS 317L seamless pipe is a low-carbon version of 317 with a lower amount of carbon. The molybdenum content makes it a suitable choice for corrosive environments and aqueous conditions.
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Stainless Steel 321 Seamless Pipe
321 seamless pipe is a titanium-stabilised austenitic stainless steel that offers good strength and excellent resistance to intergranular corrosion, especially after exposure to elevated temperatures.
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Stainless Steel 321H Seamless Pipe
SS 321H seamless pipe is a high-carbon version of 321, developed to improve creep and stress-rupture strength for high-temperature applications.
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Stainless Steel 347 Seamless Pipe
The 347 seamless pipe has niobium (columbium) and tantalum stabilisation, which increases the intergranular corrosion resistance at temperatures ranging from 800 to 1500°F.
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Stainless Steel 347H Seamless Pipe
The high amount of carbon is the only difference between 347H and 347. The higher carbon content enhances creep strength at elevated temperatures, while the columbium and tantalum work as stabilisers to prevent intergranular corrosion.
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Stainless Steel 904L Seamless Pipe
904L seamless pipe has low carbon content and high nickel content, which resists intergranular corrosion and stress corrosion cracking, respectively. The 4-4.5% molybdenum content makes it highly resistant to pitting and crevice corrosion.
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain size, ET, UT, HT)
- Laboratory Test Certificate from the Government-Approved Lab
Industrial Applications of Seamless Stainless Steel Pipes
The stainless steel seamless pipe finds its application in various industries exposed to high heat, corrosive fluids, saltwater, and marine environments.
Oil and Gas
It is extensively used in the oil and gas industry to transport crude oil, natural gas, and refined petroleum products under high-pressure and high-temperature conditions
Chemical and Petrochemical industry
For the chemical and petrochemical industry, it is mainly used for pipelines, heat exchangers, reactors, and process equipment handling corrosive chemicals and aggressive media.
Power generation
SS Seamless (SMLS) pipe is used in boilers, steam pipelines, cooling water systems, and superheaters.
Sugar Industry
The seamless SS pipe is applied for transporting raw juice, clarified juice, syrup, molasses, and components for vacuum crystallisers.
Pulp & Paper
Mainly used in bleaching systems to transport chemicals, process water systems to handle filtrate & recycled process water, and digesters & washers.
Automotive & Aerospace
It is found in exhaust systems, braking systems, hydraulic systems, structural components, and selected aerospace fluid systems.
Frequently Asked Questions
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What is the manufacturing process of SS Seamless Pipes?
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What is the difference between a seamless and a welded pipe?The major difference between a seamless pipe and a welded pipe is that a seamless pipe is made using a solid billet without any welded seams, and a welded pipe is made by rolling and joining steel coils or plates into a tubular shape.
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Is a seamless pipe stronger than a welded one?Yes, a seamless pipe is generally considered stronger than a welded one because the lack of a welded seam makes it more suitable for high-temperature, high-pressure, and highly corrosive environments. It also has a more uniform wall thickness and strength
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Which is better, seamless or ERW pipe?Seamless and ERW (Electric Resistance Welded) pipes are both good in their own ways. A seamless pipe is used for high-pressure, high-temperature, and critical service applications. ERW, on the other hand, is more suitable for general-purpose and low-to-medium pressure applications.
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Where can I buy seamless stainless pipe?You can buy high-quality seamless stainless steel pipes from us at Xintongda Special Steel. Here, we have around 4 decades of experience and specialise in manufacturing seamless pipes. We have a supply capacity of 25,000 tons a year and hold internationally recognised ISO certifications.
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What is the standard surface finish of seamless stainless steel pipe?The type of surface finish of a seamless stainless steel pipe totally depends on its use. Mill finish, for instance, is preferred for industrial use, while 2B (bright, semi-reflective) is suitable for general purposes.