Seamless pipes by applications

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries.

Seamless pipes find applications across various industries and sectors due to their strength, durability, and reliability. Here are some common applications of seamless pipes categorized by industry:

Bearing Pipes

Pipes designed for bearing loads, offering high strength and durability.

Boiler Tubes

Premium quality boiler tubes for reliable performance in steam generation applications.

Cold Drawn Cylinder Pipe

Cold drawn cylinders for precision and consistency in pipe dimensions and surface finish.

Fluid Tubes

Tubes for fluid transfer applications, ensuring leak-proof and durable performance.

Heat Exchanger Tubes

Efficient heat exchanger tubes designed for optimal thermal transfer in various industries.

High Strength Cylinder Pipe

High-strength pipes for applications requiring superior pressure and weight resistance.

Honed Tube

Honed tubes for precise internal diameters and surface finishes, ideal for hydraulic and pneumatic systems.

Sour Service Environment pipe

Line pipes specifically engineered for sour service environments, resistant to corrosion and hydrogen embrittlement.

Low-Temperature Service Pipe

Pipes designed for low-temperature service, ensuring flexibility and impact resistance at cryogenic temperatures.

Marine Seamless Steel Pipe

Seamless steel pipes for marine applications, providing strength and corrosion resistance in harsh marine conditions.

Mechanical Tubes

Mechanical tubes designed for structural applications, offering high strength and precision.

Other Structural Pipe

Structural pipes designed for various construction and engineering applications.

Pipe For Chemical Equipment

Pipes specifically manufactured for use in chemical processing equipment.

Pipe For Cryogenic Device

Pipes designed for cryogenic applications, ensuring performance at extremely low temperatures.

Pipe For Mechanical Engineering

Pipes utilized in mechanical engineering for fluid transfer and structural support.

Nuclear Power Station pipe

Seamless pipes for nuclear power stations, offering high integrity and safety standards.

Structure Pipe

High-quality seamless pipes for structural applications, ensuring reliability and durability.

Tubes For Pressure

Seamless tubes designed for withstanding pressure applications in various industries.

Seamless Pipes For High Temperature

Pipes suitable for high-temperature environments, offering excellent heat resistance.

Low And Medium Pressure pipes

Seamless pipes for low and medium pressure services, providing consistent performance.

Ship Building Tubes

Specialized seamless tubes for shipbuilding, designed for maritime applications and harsh conditions.

Steel Pipe For Gas Cylinder

Steel pipes for gas cylinder applications, ensuring safety and reliability in gas storage.

Tubes For Mechanical And Automobile

Dedicated tubes for mechanical and automotive industries, ensuring precision and reliability.

Seamless drill pipe

High-strength seamless drill pipes for drilling operations, offering durability and reliability.

What is a seamless pipe used for?

Seamless pipes are commonly used in various industries for different applications. Here are some of the main uses of seamless pipes:

1. Oil and Gas Industry: Seamless pipes are extensively used in the oil and gas industry for transporting fluids such as crude oil, natural gas, and petroleum products. They are capable of withstanding high-pressure and high-temperature conditions, making them suitable for oil and gas exploration, production, and transportation.
2. Petrochemical Industry: Seamless pipes find applications in the petrochemical industry for transporting chemicals, gases, and other hazardous substances. They are resistant to corrosion and can handle aggressive media, making them ideal for petrochemical plants and refineries.
3. Power Generation: Seamless pipes are used in power plants for various applications, including steam pipelines, boiler tubes, and turbine piping. They can withstand high temperatures and pressures, making them suitable for power generation through thermal and nuclear processes.
4. Automotive Industry: Seamless pipes are used in the automotive industry for manufacturing exhaust systems, fuel injection systems, and hydraulic lines. They provide excellent dimensional accuracy, strength, and resistance to corrosion, ensuring efficient and reliable performance in automotive applications.
5. Construction and Infrastructure: Seamless pipes are used in construction projects for various applications, including structural support, water supply systems, sewage systems, and underground pipelines. They offer high strength and durability, ensuring long-lasting and reliable infrastructure.
6. Mechanical and Engineering Applications: Seamless pipes are widely used in mechanical and engineering applications, such as machinery, equipment, and tool manufacturing. They are used for conveying fluids, gases, and solids in various industries, including manufacturing, aerospace, and defense.
7. Heat Exchangers and Boilers: Seamless pipes are utilized in heat exchangers and boilers for efficient heat transfer. They are suitable for carrying hot fluids and steam at high temperatures and pressures, making them essential components in industries such as power generation, chemical processing, and HVAC systems.

It's important to note that the above applications are just a few examples, and seamless pipes have a wide range of uses in many other industries and sectors where reliable and efficient fluid transportation is required.

Main products and application

Dimension tolerances of seamless steel pipe

Tolerances on out diameter

For pipe over 10 inches as a special OD tolerance pipe, the OD shall within vary +1% /-1%.

Tolerance on dimension

For standard pipe, except as provided for thin-wall pipe, the tolerances of diameter shall be in accordance with the following table:

Tolerances on wall thickness

The wall thickness at any point shall be within the below tolerance table.

Available size range

Table 1, size for cold-drawn or cold rolled tube (Unit:mm)

Note:

1. The size in the table above is for the cold-drawn or cold-rolled tubes.
2. The size of the green area is the regular specification, we can accept orders directly, but the yellow area shall be subject to a technical evaluation.
3. The Out side diameter (O.D) and wall thickness (W.T.) of the tube should be complied.

At the request of the purchaser and specified in the purchase order, the steel tubes with other O.D. and W.T. can be produced after the review.

Size for hot-rolled tube (31.8-180mm)

(Unit:mm)

Size for hot-rolled tube (OD.:200-457mm)

(Unit:mm)

What is 10MnDG?

10MnDG is a type of seamless steel pipe that belongs to the family of high-pressure boiler tubes. It is a low-alloy steel pipe with a chemical composition that includes carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), and other trace elements.

The chemical composition of 10MnDG typically includes:

• Carbon (C): 0.08-0.13%
• Silicon (Si): 0.17-0.37%
• Manganese (Mn): 0.70-1.00%
• Phosphorus (P): ≤0.025%
• Sulfur (S): ≤0.015%
• Other trace elements such as chromium (Cr) and nickel (Ni)

10MnDG seamless steel pipe is mainly used in the manufacture of high-pressure and ultra-high-pressure boilers and pressure vessels. The pipes are designed to withstand high-pressure and high-temperature environments, making them suitable for use in applications such as power generation, chemical processing, and oil and gas refining.

10MnDG is a reliable material with excellent mechanical properties, including high strength, toughness, and resistance to creep deformation at high temperatures. These characteristics make it an ideal choice for use in critical applications where performance and reliability are essential.

Overall, 10MnDG seamless steel pipe is an important component of industrial piping systems, providing safe and efficient means for transporting fluids at high pressures and temperatures.

What is 16MnDG?

16MnDG is a type of seamless steel pipe that is commonly used in the manufacturing of high-pressure vessels and boilers. It belongs to the family of low-alloy steels and has a chemical composition that includes carbon, silicon, manganese, phosphorus, sulfur, and other trace elements.

The chemical composition of 16MnDG typically includes:

• Carbon (C): 0.12-0.18%
• Silicon (Si): 0.17-0.37%
• Manganese (Mn): 1.20-1.60%
• Phosphorus (P): ≤0.025%
• Sulfur (S): ≤0.015%
• Other trace elements such as chromium (Cr) and nickel (Ni)

16MnDG seamless steel pipe has good mechanical properties, including high strength, toughness, and resistance to creep deformation at high temperatures. These characteristics make it an excellent choice for use in high-pressure and high-temperature environments, such as in the manufacture of boilers, pressure vessels, and other equipment used in power generation and chemical processing industries.

The seamless nature of 16MnDG pipes ensures uniformity and consistency in their structure, which makes them less prone to defects or failures. This enhances their reliability and safety, providing a secure means for transporting fluids at high pressures and temperatures.

Overall, 16MnDG seamless steel pipe is an important component of industrial piping systems, providing a reliable and efficient means for transporting fluids in harsh and demanding environments.

What is 09DG?

09DG is a type of seamless steel pipe that belongs to the family of high-temperature and pressure-resistant steel pipes. It has a chemical composition that includes carbon, silicon, manganese, phosphorus, sulfur, and other trace elements.

The chemical composition of 09DG typically includes:

• Carbon (C): 0.07-0.12%
• Silicon (Si): 0.17-0.37%
• Manganese (Mn): 0.40-0.70%
• Phosphorus (P): ≤0.025%
• Sulfur (S): ≤0.015%
• Other trace elements such as chromium (Cr) and nickel (Ni)

09DG seamless steel pipe is designed to withstand high-temperature and high-pressure conditions, making it suitable for use in the manufacture of boilers, heat exchangers, and other equipment used in the power generation and chemical processing industries.

The seamless nature of 09DG pipes ensures that they have a homogeneous and consistent structure, which reduces the likelihood of defects or failures. This enhances their safety and reliability, providing a secure means for transporting fluids under high pressures and temperatures.

09DG seamless steel pipe has excellent mechanical properties, including high strength, good toughness, and resistance to creep deformation at high temperatures. These characteristics make it an ideal material for use in critical applications where performance and reliability are essential.

Overall, 09DG seamless steel pipe is an important component of industrial piping systems, providing a reliable and efficient means for transporting fluids at high pressures and temperatures.

Seamless tube processing

With years of expertise, we provide a diverse array of steel tube processing options. From sawing and machining tube blanks to intricate bending and upsetting operations, we actively assist you throughout your projects.

Our capabilities extend to eccentricity reduction and concentricity enhancement through turning and grinding. We excel in creating complex geometries using processes like rotary swaging and axial forming. Additionally, we offer property modifications via partial heat treatment, ensuring tailored solutions for your specific needs.

Variable wall thicknesses

Drilling / stamping / lasering

Peeling / roller burnishing

Cold forming

Cutting

Beveling

Deburring

Thread rolling / threading

Partial hardening

Turning / milling / grinding

Reducing / expanding

Inspection

Chemical composition inspection, mechanical properties test(tensile strength,yield strength, elongation, flaring, flattening, bending, hardness, impact test), surface and dimension test,no-destructive test, hydrostatic test.

PMI

identification of the chemical composition of the metal used to manufacture the fitting. Uses PMI sensors, including X-ray fluorescence or optical emission spectrometry.

Size measurement

Seamless pipes with compound bevels as per ASME B16-25 And ASTM A333

Delivery

Steel pipe delivery status(condition)

Steel pipe delivery status(condition): cold / hard (BK), cold / soft (BKW), after cold stress relief annealing (BKS), annealing (GBK), normalized (NBK).

Condition on delivery of steel pipe

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.

The general cold strip mills, volume should go through continuous annealing (CAPL unit) to eliminate cold hardening and rolling stress, or batch annealing reach the mechanical properties of the corresponding standard specifies. Cold rolled steel surface quality, appearance, dimensional accuracy better than hot-rolled plate, and right-rolled thin product thickness is about 0.18mm, so the majority of users favor.

Cold rolled steel coil substrate products deep processing of high value-added products. Such as electro-galvanized, hot dip galvanized, electro-galvanized fingerprint resistant, painted steel roll damping composite steel, PVC laminating steel plates, etc., so that the excellent quality of these products has a beautiful, high resistance to corrosion, has been widely used.

Cold rolled steel coil finishing after annealing, cut the head, tail, trimming, flattening, smooth, heavy volume, or longitudinal clipboard. Cold-rolled products are widely used in automobile manufacturing, household electrical appliances, instruments, switches, buildings, office furniture and other industries. Steel plate strapping package weight of 3 to 5 tons. Flat sub-volume typically 3 to 10 tons / volume. Coil diameter 6m.

Packing

Bare packing/bundle packing/crate packing/wooden protection at the both sides of tubes and suitably protected for sea-worthly delivery or as requested.

Placing steel pipes into containers

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 to work prevent rusting and Sea transportation security.

• Plastic caps plugged at the two sides of pipe ends
• Should be avoided by the steel strapping and transport damage
• Bundled signs should be uniform and consistent
• The same bundle(batch) of steel pipe should be came from the same furnace.
• The steel pipe has the same furnace number, the same steel grade, the same specifications.

Our packing can meet any needs of the customers.

Alloying Elements

Commonly used alloying elements and their effects are listed in the table given below.