Seamless Steel Pipe

seamless steel pipe supplier

carbon steel seamless pipe manufacturer

A seamless steel pipe(SMLS Pipe) has no welding seam. It is more durable, and commercial, industrial, and residential customers often choose it for many applications.

UNIASEN is a seamless carbon steel pipe manufacturer and supplier. We have over two decades of experience in the industry. We focus on providing wholesale carbon steel pipe services to customers in over 50 countries worldwide.

When considering wholesale seamless steel pipes, refer to the following parameters. Or, contact our experts directly. They can advise you on dimensions, tolerances, specifications, quantities, etc.

UNIASEN carbon steel seamless pipe specification

  • Name: Seamless(SMLS)Steel Pipe/Tube
  • Standard: API 5L, API 5CT, ASTM A106, ASTM A53,  ASTM A179, ASTM A789, ASTM A333, ASTM A192, DN17175, DIN1629, DIN2391, EN10216
  • Grade: GR.A, GR.B,10#, 20#
    X42, X46, X52, X56,X60,X70, H40, J55, K55, N80,P110
  • Types: Line Pipe, Tubing and Casing, Boiler Pipe, Drilling Pipe etc.
  • Sizes:
    Out diameter: 1/4″-36″(13.7mm ~914mm, DN8~ DN900)
    Thickness:1.65mm ~30.96mm(SCH 5S ~SCH XXS)
    Length: 3m-18m
  • Pipe Coating: Oiling, Lacquering, Hot-Dip Galvanizing, Pre-Galvanizing, Fusion Bonded Epoxy (FBE) Coating, Polyethylene (PE) Coating, Polypropylene (PP) Coating
  • Pipe End Type: Square End, Bevelled End, Threaded End, Grooved End, Shouldered End
  • Connection Accessories: Pipe Elbow, Pipe Tee, Pipe Cross, Pipe Reducer, Pipe Flange, Pipe Coupling, Pipe Clamp
Introduction of  Seamless Steel Pipe

seamless steel pipe sizes

NOMINAL PIPE SIZE OD NOMINAL WALL THICKNESS
DN INCH MM SCH10 SCH20 SCH30 STD SCH40 SCH60 XS SCH80 SCH100 SCH120 SCH140 SCH160 XXS
15 1/2 21.3 2.11 2.41 2.77 2.77 3.73 3.73 4.78 7.47
20 3/4 26.7 2.11 2.41 2.87 2.87 3.91 3.91 5.56 7.82
25 1 33.4 2.77 2.9 3.38 3.38 4.55 4.55 6.35 9.09
32 1.1/4 42.2 2.77 2.97 3.56 3.56 4.85 4.85 6.35 9.7
40 1.1/2 48.3 2.77 3.18 3.68 3.68 5.08 5.08 7.14 10.15
50 2 60.3 2.77 3.18 3.91 3.91 5.54 5.54 8.74 11.07
65 2.1/2 73 3.05 4.78 5.16 5.16 7.01 7.01 9.53 14.02
80 3 88.9 3.05 4.78 5.49 5.49 7.62 7.62 11.13 15.25
90 3.1/2 101.6 3.05 4.78 5.74 5.74 8.08 8.08
100 4 114.3 3.05 4.78 6.02 6.02 8.56 8.56 11.13 13.49 17.12
125 5 141.3 3.4 6.55 6.55 9.53 9.53 12.7 15.88 19.05
150 6 168.3 3.4 7.11 7.11 10.97 10.97 14.27 18.26 21.95
200 8 219.1 3.76 6.35 7.04 8.18 8.18 10.31 12.7 12.7 15.09 18.26 20.62 23.01 22.23
250 10 273.1 4.19 6.35 7.8 9.27 9.27 12.7 12.7 15.09 18.26 21.44 25.4 28.58 25.4
300 12 323.9 4.57 6.35 8.38 9.53 10.31 14.27 12.7 17.48 21.44 25.4 28.58 33.32 25.4
350 14 355.5 6.35 7.92 9.53 9.53 11.13 15.09 12.7 19.05 23.83 27.79 31.75 35.71
400 16 406.4 6.35 7.92 9.53 9.53 12.7 16.66 12.7 21.44 26.19 30.96 36.53 40.19
450 18 457.2 6.35 7.92 11.13 9.53 14.27 19.05 12.7 23.83 39.36 34.93 39.67 45.24
500 20 508 6.35 9.53 12.7 9.53 15.09 20.62 12.7 26.19 32.54 38.1 44.45 50.01
550 22 553.8 6.35 9.53 12.7 9.53 22.23 12.7 28.58 34.93 41.28 47.63 53.98
600 24 609.6 6.35 9.53 14.27 9.53 17.48 24.61 12.7 30.96 38.89 46.02 52.37 59.54
650 26 660.4 7.92 12.7 9.53 12.7
700 28 711 7.92 12.7 15.88 9.53 12.7
750 30 762 7.92 12.7 15.88 9.53 12.7
800 32 312 7.92 12.7 15.88 9.53 17.48 12.7
850 34 864 7.92 12.7 15.88 9.53 17.48 12.7
900 36 914 7.92 12.7 15.88 9.53 19.05 12.7

carbon steel seamless pipe Applications

seamless steel pipe manufacturing process

A cylindrical steel bar is used to produce SMLS pipe. After heating the bar to a high temperature, a probe is put into the cylinder to produce a hole. The cylinder is then moved to rollers that shape it to the required diameter and wall thickness.

Why Choose UNIASEN?

UNIASEN was established in 1998. It is a top manufacturer and supplier of carbon steel pipes in China. Its product portfolio speaks volumes about its quality and expertise. If you have any questions about purchasing steel pipes, please contact our team of experts.

Wide Range of Products: UNIASEN specializes in a full range of pipes. This includes SMLS, ERW, LSAW, and SSAW pipes. There are also many pipe fittings. They include line pipe, piling pipe, structural pipe, fire pipe, and coated pipe.

Fast Delivery: UNIASEN’s steel pipe production capacity is 6 million tons. Its pipe fittings production capacity is 1 million pieces. In-stock products will be shipped to the port of departure within seven days.

Quality Certification: We follow international certifications. They include ISO 9001, ISO 14001, and ISO 45001. Our products are made to global standards. These include API 5L, API 5CT, ASTM A53, ASTM A106, and EN10219. This ensures that our pipes meet our required specifications.

Worry-free After-sales: The professional after-sales team responds promptly 24 hours a day. If the product has quality problems, we accept returns and exchanges after delivery. This ensures customer satisfaction.

Advantages of Seamless steel Pipe

The condition of seamless steel pipes is crucial in many fields. This is especially true in applications that demand top quality, performance, and safety. Many engineers and manufacturers choose this material. It has special benefits and can be used in many ways. Here are its main advantages:

advantages of seamless steel pipe-Uniform shape icon

Uniform Shape

Seamless steel pipes are usually more exact in size. They are also more stable in shape than welded steel pipes.

advantages of seamless steel pipe-High strength icon

High Strength

Seamless steel pipes have a uniform structure. They have high compressive strength because they have no welds.

advantages of seamless steel pipe-Corrosion resistance icon

Corrosion Resistance

Seamless steel pipes have a uniform surface. They lack irregularities found in welded seams. This reduces the chance of corrosion.

advantages of seamless steel pipe-Extreme Temperature icon

Extreme Temperature

Seamless steel pipes are made without welding. So they can handle extreme temperatures and are less likely to crack. 

Seamless Vs. Welded Pipe

Seamless pipes are made from high-quality steel. It is cast into a round shape and then pierced at the center. Then, it goes through rolling and heat treatment. After that, it is cut into different sizes based on the need. These pipes are devoid of any welding joint, which enhances their structural integrity. Seamless pipes are durable. They can handle high heat and pressure. They also resist corrosion. They have uniform properties throughout their length, making them better than welded pipes.

Seamless Pipe

  • Expensive
  • No welded joints in the pipes
  • Made of solid round billets or steel
  • Outer diameter varies between 1/8 Inch and 26-inch
  • Can bear high-pressure
  • Thickness tolerance is unstable.

Welded Pipe

  • Cheaper option compared to seamless pipes
  • May have one or more welded joints
  • The main raw material is steel coils.
  • Outer diameter varies between 2-3/8 Inch and 24-inch
  • Can’t withstand high pressure
  • Thickness tolerance is moderately precise.
  • Length tolerance is moderately precise.

What is Seamless Steel Pipe?

A seamless steel pipe is perforated from a round surface and has no welds on its surface. They come in various types. The type depends on how they are made. They include cold-drawn, cold-rolled, hot-rolled, and extruded seamless steel pipes.

The making of seamless steel pipes starts with billet production. This is a solid, cylindrical steel bar. They’re produced through continuous rolling of steel. The billets are then heated to soften the steel at high temperatures. They are pierced at the center with a mandrel mill or piercing mill.

It creates a hollow shell, leading to the formation of the pipe. The diameter of this piercing billet is further reduced by rolling and stretching it. This hollow shell goes through a sizing mill. The mill ensures its size matches the specifications. The pipe is then cooled to stabilize its structure. If needed, it gets more surface treatment to prevent rust.

These pipes are widely used in engineering and manufacturing industries. These pipes are used in large amounts to move water, oil, and natural gas. They are also used to make ring parts. Their smooth interior surface reduces friction for fluid flow.

They are corrosion-resistant, so they last a long time. More importantly, they’ve a uniform structure throughout, making them reliable.

What is Seamless Steel Pipe

FAQs about Seamless Steel Pipe

UNIASEN is China’s top seamless carbon steel pipe manufacturer and exporter. Our seamless steel pipe products are produced from raw materials from high-quality carbon steel. We will buy from China’s top raw material suppliers. They will meet your standards and steel grade requirements. For example, Baogang, Shougang, HBIS, etc.

UNIASEN is a Chinese carbon steel pipe supplier. We have over 20 years of experience and a full-service system. If you have a problem with your product, we will send one of our experts to you.

Seamless steel pipes are usually better than welded steel pipes. They have several advantages, such as:

  1. No welds: Seamless steel pipes are made from one piece of steel billet, without any welds. This avoids welds that might happen during welding. By eliminating potential weaknesses from welding, the pipe becomes stronger overall.
  2. Higher compressive strength: Seamless steel pipes have higher strength. They lack welds, so their structure is more even. This gives them higher compressive strength. This makes seamless steel pipes more suitable in high-pressure and high-temperature environments.
  3. Better corrosion resistance: Seamless steel pipes have a smooth surface, reducing the chance of corrosion. The welds are even. Seamless steel pipes are more reliable in applications that need corrosion resistance.
  4. Suitable for high and low-temperature environments: Seamless steel pipes are good for high and low-temperature environments. They don’t crack easily.
  5. Precise dimensions and stable shape: Seamless steel pipes are usually more precise in size and more stable in shape than welded ones. This is better for bigger applications, like making precision machinery and equipment.

UNIASEN seamless carbon steel pipe factory implements more than 50 international standards.

Among them, the international standards for seamless steel pipes include API 5L, API 5CT, ASTM A106, ASTM A179, ASTM A789, DN17175, EN10216, etc.

If you have detailed standards or tech requirements, please contact us. We will discuss them in depth.

This depends on the inventory, we usually have 20,000 tons of steel pipes in stock.

If the steel pipe you ordered is in stock, we usually deliver it to the port within 7 days.

If the product you require is not in stock, we usually complete production within 30 days.

After receiving the goods, check the following aspects of the seamless steel pipe:

  • Appearance Quality
  • Dimensional accuracy
  • Chemical composition

UNIASEN is a carbon steel pipe manufacturer and supplier with more than 20 years of experience.

We supply steel pipes to over 50 countries and regions worldwide. We have top-quality products, professional technical services, and complete after-sales support.

The length of seamless steel pipes usually follows standards, and common lengths include 6 meters and 12 meters.

The length range of seamless steel pipes we provide is 3m-18m. If you have special needs. We can also customize non-standard lengths for you.

When choosing a seamless steel pipe specification for a project, multiple factors are considered. Here are some guiding steps and considerations:

1. Understand project requirements:

Figure out why the pipe is used: for carrying liquids, gases, or for building structures.

2. Consider the work environment:

Think about the environmental conditions for the pipeline, like temperature, pressure, and chemicals. Special seamless steel pipes may be needed in certain conditions. These include extreme heat, pressure, or corrosive surroundings.

3. Check out relevant standards:

To find out the specifications and performance requirements for seamless steel pipe in specific applications, you can refer to international, national, or industry standards. Common standards include ASTM, API, DIN, etc.

4. Determine pipe size:

To meet engineering specifications, find the size of the seamless steel pipe: outer diameter, wall thickness, and length. These dimensions should meet the flow requirements and structural design of the project.

5. Consider corrosion resistance:

Choose stainless steel or other corrosion-resistant alloys if the media will corrode the pipe.

6. Pay attention to compressive strength:

Compressive strength is generally affected by pipe material and wall thickness.

7. Follow the project budget:

Ensure the specifications of the seamless steel pipe you choose fit within the project budget. The prices of seamless steel pipes of different specifications and materials may vary greatly.

8. Consider maintainability:

When choosing steel pipes for a pipeline, consider maintenance requirements. Choose easy-to-maintain seamless pipes. This helps reduce maintenance costs in the future.

9. Comply with regulations and safety standards:

Ensure the seamless steel pipe specifications are safe and safe and follow local and national rules and are safe.

10. Communicate with UNIASEN steel pipe manufacturer:

If you’re not sure how to choose, contact us for professional advice. We will give you personalized solutions based on your needs. We will also advise you on performance and suitability. Plus, we’ll provide you with the best quote.

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