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Your Leading Stainless Steel Seamless Pipe Supplier

 

GNEE is a professional supplier of austenitic stainless steel, super austenitic stainless steel, duplex steel, super duplex steel and other materials. It has internationally advanced high-precision production equipment and first-class processing technology. The product implementation standards include: national standard, American standard, Japanese standard, German standard, European standard, Russian standard, etc. At the same time, non-standard products can be customized according to customer requirements.

 
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Why choose us?

Our factory

At present, the total investment is RMB 30 million, the plant area is more than 35,000 square meters, and the number of employees is more than 200 and exports 5 million tons of steel products and accessories to overseas customers each year, with annual sales exceeding US$800 million.

Our certifications

GNEE Group has passed SGS certification and has successively obtained ISO9001, ISO14001, ISO45001 system certification, ensuring that all steel pipes and accessories meet quality requirements.

 

Sales market

It has exported steel pipes to more than 150 countries and regions including the United States, Mexico, Venezuela, Kuwait, Colombia, Turkey, Italy, Brazil, France, Iran, Russia, Vietnam, etc.,

Our products

Its main products include stainless steel pipes, stainless steel plates, stainless steel coils, stainless steel bars and stainless steel pipe fittings, etc., with competitive quality and price.

 

 

 
 
Types of Stainless Steel Seamless Pipes：
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Austenitic stainless steel seamless pipes

Austenitic stainless steel is the most popular and widely used stainless steel in the world. Through increasing the percentage of chromium, moly and nitrogen to the base alloy, austenitic SS's corrosion resistance can be further enhanced . The addition of these chemical elements makes the steel nonmagnetic and make it to be bend, drawn, or formed. Austenitic stainless steel cannot be hardened by heat treatment. Generally, austenitic stainless steel can be classified into 200 series and 300 series, and grade 304/304L is the most familiar stainless steel, which is widely used in food industry.

 

Ferritic stainless steel seamless pipes

Ferritic stainless steel has high chromium content but low carbon content (usually below 0.1 percent). Ferritic SS is based on the body-centred cubic crystal structure of iron combined with a small percentage of chromium, which can be cold worked, but can not be heat treated. Except for low welding resistance, ferritic stainless steel has exceptional resistance to cracking corrosion stress. Ferritic SS is similarly magnetic to martensitic steels. 430 and 409 are the most common ferritic grades, mostly used in the automotive sector.

Martensitic stainless steel seamless pipes

Martensitic stainless steel is a specific type of stainless steel, whose nickel content is small, whereas its carbon content can up to 1 percent. High carbon content enables martensitic SS to be hardened and tempered to make it become extremely hard, and be ideal for applications where strength, hardness and wear resistance are essential. Unlike typical austenitic stainless steel, martensite stainless steel is magnetic. Common grades of martensite stainless steel are 410, 420, and 440C.

 

Duplex and super duplex stainless steel seamless pipes

Duplex and super duplex stainless steel are the combination form of ferritic and austenitic stainless steels, which can only be hardened only by cold working. The most frequently used grades are 904L and 2205 which contain higher chromium, nickel and other alloying elements such as nitrogen or copper to enhance its structure or performance. Duplex and super duplex stainless steel is widely used in applications that require high strength as duplex and super duplex SS feature high corrosion resistance, excellent mechanical strength and good weldability.

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Benefits of Stainless Steel Seamless Pipe：

 

 
 

Corrosion resistance:

Stainless steel pipes are highly resistant to corrosion and oxidation, making them suitable for various applications, including water supply, chemical processing, and offshore oil and gas exploration. They can withstand harsh environments and exposure to chemicals, moisture, and high temperatures without rusting or deteriorating.

 
 

Durability and strength:

Stainless steel pipes are known for their exceptional strength and durability. They can withstand high pressure and temperature fluctuations, making them suitable for demanding industrial applications. Stainless steel pipes have a long lifespan and require minimal maintenance, reducing replacement and repair costs.

 
 

Hygiene and cleanliness:

Stainless steel is a non-porous material that is resistant to bacteria, fungi, and other microorganisms. This makes stainless steel pipes an excellent choice for applications where cleanliness and hygiene are essential, such as food and beverage processing, pharmaceuticals, and healthcare facilities.

 
 

Aesthetic appeal:

Stainless steel pipes have an attractive, sleek appearance that adds a modern and sophisticated touch to various architectural and decorative applications. They are often used in building facades, handrails, furniture, and interior design elements.

 
 

High heat resistance:

Stainless steel pipes exhibit excellent heat resistance, allowing them to withstand high temperatures without deformation or structural damage. This makes them suitable for applications involving heat transfer, such as in power plants, heat exchangers, and automotive exhaust systems.

 
 

Recyclability:

Stainless steel is a 100% recyclable material, making stainless steel pipes an environmentally friendly choice. They can be melted down and reused without any loss in quality or performance, contributing to sustainability efforts and reducing the demand for new raw materials.

 
 

Versatility:

Stainless steel pipes are available in various grades, sizes, and configurations, allowing for customization and adaptability to different applications. They can be easily fabricated, welded, and joined, making installation and modification processes more convenient.

 
 

Fire resistance:

Stainless steel pipes have excellent fire resistance properties, making them suitable for applications where fire safety is crucial. They do not contribute to the spread or intensification of fires and can withstand high temperatures for prolonged periods.

 

Application of Stainless Steel Seamless Pipe：

Fertilizer industry

Steel seamless pipes come in handy in several sectors of the fertilizer industry. The regions of application of the lines in the fertilizer industry mainly include piping system equipment, high-pressure tubes in Melamine plants, and heat exchanging systems in Urea synthesis ethylene plants.

 

Power generation industry and environmental technologies

Steel seamless pipes and tubes are used primarily as heat exchangers in giant power plants and the energy department. Environmental uses and waste incineration plants also utilize the same application style known as reheater superheaters.

 

Chemical and petrochemical industries

Steel seamless plants prove highly useful in chemical and petrochemical industries. The area of application in the chemical and petrochemical sectors mainly includes the following: High-pressure pipes in melamine plants, elaborate piping systems and heat exchanging systems of urea synthesis ethylene plants.

 

Oil and gas industries

Steel seamless pipes are a common requirement for oil casing and tubing for offshore and onshore oil & gas transfer. The oil extracted offshore needs large tubes to be transferred from one reservoir to another. Not all materials can support unprocessed raw oil. Steel seamless pipes are a perfect application for such purposes.

 

Engineering and construction industry

Steel seamless pipes are highly used in engineering and construction industries in the following sectors: Automobile designing technology, food manufacturing industry, measurement and control technology, hydraulic press, cylinders and pumps, etc. Stainless steel seamless pipes are used as a half-finished product in the departments mentioned above. They are used as fittings and tubes installed in big machines or as a half-finished product for machined parts.

 

Automotive industry

In the automotive sector, dmv items are explicitly used in the following areas: Other than these, they are also used in hydraulic braking systems.

 

Steel seamless pipes used in project service

Seamless pipes and tubes are used in petroleum extraction, connecting and transporting various liquids such as water, gas and other fluids. Seamless steel pipes are also used in commercial and residential walls, laboratories, and industrial structures.

 

Steel seamless pipes used in high temperature and pressure service

To sustain high temperature and pressure in factories, only resilient seamless steel pipes of various ranges are used. Seamless tubes and pipes are valuable for transferring liquids in large containers, heating pipelines and boilers, and high-temperature reheaters

 

 

Product Parameters：

 

Commodity

Stainless steel seamless pipe

Grade

Austenitic: 304/L/H/N, 316/L/H/N/Ti, 321/H, 309/H, 310S, 347/H, 317/L, 904L

Duplex steel: S31803,S32205,S32750,S32760

Standard

ASTM A213, A312, ASTM A269,ASTM A778, ASTM A789, DIN 17456,DIN 17457,DIN 17459, JIS G3459, JIS G3463, GOS T9941,EN 10216, BS3605, GB13296,etc.

Technique

Hot Rolled

Type

Seamless pipe

OD

3.0mm - 2500mm (1/8" - 100")

Thickness

1.0-150mm (SCH10S-XXS)

Length

5.8m,6m,11.8m,12m, 4-7m or as required

Packing

In bundles, Nylon bags, Wooden cases or as required

Delivery Time

Ready stocks 3-7 days, Customized 7-10 days for customized size

MOQ

1 Ton

Export To

Singapore, Canada, Indonesia, Korea, USA, UK, Thailand,Saudi Arabia, Vietnam,India, Peru, Ukraine ,Brazil,South Africa, etc.

 

Type

Seamless Pipe

Technique

Hot Rolled/Cold Drawn

Shape

Round/Customized

Process

Polished/Solution Treatment

End

Plain End/Bevel End

Sample

Free

Package

Seaworthy Package

Delivery Date

1-15 Days

Transport Package

Seaworthy Package

Specification

Customized

Stock

Size Can Customized

 

Packaging and Shipping：

 

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FAQ

Q: What is the difference between seamless pipe and normal pipe?

A: In terms of the pressure bearing property, the use of a seamless pipe enables higher pressure bearing ability. On average, the pressure borne by a seamless variety pipe is almost 20% higher than a conventionally welded one.

Q: Is seamless pipe stronger than welded?

A: Pipes provide the highest strength, pressure capacity, and corrosion resistance, making them ideal for demanding oil & gas, chemical, and power plant applications. The tradeoffs are higher cost and more limited size options.

Q: What are the main characteristics of stainless steel seamless pipes?

A: Stainless steel seamless pipes have a uniform and continuous structure without a welded seam. They have high strength, excellent corrosion resistance, and can withstand high - pressure applications. Their smooth inner surface also provides good flow characteristics for fluids.

Q: What are the common manufacturing methods for stainless steel seamless pipes?

A: They are typically made through processes like extrusion or piercing. In extrusion, a billet of stainless steel is pushed through a die to form the pipe. Piercing involves using a mandrel and rolls to create the hollow shape from a solid stainless steel bar.

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

A: Common grades include 304, which offers good general - purpose corrosion resistance. 316 is used for more corrosive environments, especially those with chloride exposure. Other grades like 904L are used for extremely corrosive and high - temperature applications.

Q: How do you select the appropriate diameter and wall thickness of a stainless steel seamless pipe?

A: Selection depends on the application requirements. For high - pressure applications, a thicker wall thickness may be required. The diameter is chosen based on the flow rate of the fluid to be transported. Engineering calculations considering factors like pressure drop, flow velocity, and mechanical strength are used to determine the optimal dimensions.

We're professional stainless steel seamless pipe manufacturers and suppliers in China, specialized in providing high quality customized service. Be free to wholesale stainless steel seamless pipe in stock here and get free sample from our factory. For price consultation, contact us.

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