Seamless Carbon Steel Pipe Manufacturer and Supplier in China

seamless carbon steel pipe manufacturer

An seamless steel pipe(SMLS Pipe) is a pipe that has no welding seam. In various applications, customers in commercial, industrial, and residential sectors generally opt for seamless pipes due to their durability.

UNIASEN is a seamless carbon steel pipe manufacturer and supplier. With a history of over two decades in the industry, our focus is on providing wholesale services for carbon steel pipes 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.

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Introduction of UNIASEN Seamless Steel Pipe

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 and 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

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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

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Application of carbon steel seamless pipe

Oil and Gas Industry

Building and Structural Engineering

Machine Made

Fire Fighting

Piling Work

Solar Energy

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seamless steel pipe manufacturing process

A cylindrical bar of steel 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.

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Why Choose UNIASEN?

Established in 1998, UNIASEN is a top carbon steel pipe manufacturer and supplier in China. Its product portfolio speaks volumes about its quality and expertise. For any questions about purchasing steel pipe, 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 is also a wide selection of pipe fittings such as 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 adhere to international certifications, which encompass ISO 9001, ISO 14001, and ISO 45001 standards. Our products are manufactured to globally recognized standards, including 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.

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Advantages of Seamless steel Pipe

The condition of seamless steel pipes is crucial in many fields, particularly in applications demanding top quality, performance, and safety. Many engineers and manufacturers choose this material because it has special benefits and can be used in different ways. Here are its main advantages:

Uniform Shape

Seamless steel pipes are generally more dimensionally precise and more stable in shape than welded steel pipes.

High Strength

Seamless steel pipes have a uniform structure and high compressive strength because there are no welds.

Corrosion Resistance

Seamless steel pipes exhibit a uniform surface without any irregularities found in welded seams. This reduces the chance of corrosion.

Extreme Temperature

As seamless steel pipes are manufactured without the inclusion of welding in the production process. So they can handle extreme temperatures and are less likely to crack.

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Seamless vs Welded Pipe

The manufacturing of seamless pipes involves the use of high-quality steel that is cast into round shape and then pierced at the center. It then undergoes some rolling processes along with heat treatment and is then cut into different sizes depending on the need. These pipes are devoid of any welding joint, which enhances their structural integrity. Seamless pipes are durable, can bear high temperature and pressure, and have greater corrosion-resistance. They have uniform properties throughout their length, making them better than welded pipes.

Seamless Pipe

Expensive
No welded joint 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 instable.

Welded Pipe

Cheaper option compared to seamless pipes
May have one or more welded joints
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

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What is Seamless Steel Pipe?

A seamless steel pipe is perforated from round surface and has no welds on its surface. They’re of various types depending on their method of manufacturing, such as cold-drawn, cold-rolled, hot rolled and extruded seamless steel pipes.

The manufacturing of seamless steel pipes starts with billet production, which is a cylindrical solid steel bar. They’re produced through continuous rolling of steel. The billets are then heated at high temperatures to soften the steel, and the billets are pierced at the center with the help of 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, which ensures its dimensions according to the specifications. The pipe is then cooled to stabilize its structure, and additional surface treatment is given if needed for rust prevention.

These pipes are widely used in engineering and manufacturing industries. These pipes are used in large quantities to transport water, oil, natural gas and other solid materials.These pipes are additionally utilized in the fabrication of ring components. Their smooth interior surface reduces frictional resistance for flow of fluid, and their corrosion-resistance makes them last long enough. More importantly, they’ve a uniform structure throughout, making them reliable.

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FAQs about Seamless Steel Pipe

What materials of seamless steel pipes do you provide?

UNIASEN is China’s top seamless carbon steel pipe manufacturer and exporter. Our seamless steel pipe products are produced from high-quality carbon steel raw materials.
We will purchase from China’s top raw material suppliers according to your standards and steel grade requirements, such as Baogang, Shougang, HBIS, etc.

What should I do if I find there are quality problems after receiving the goods?

As a Chinese carbon steel pipe supplier with more than 20 years of experience, UNIASEN has a complete service system. If there is a problem with your product, we will typically send one of our quality experts to your location to handle the situation.

What are the advantages of seamless steel pipes over welded steel pipes?

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

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.
Higher compressive strength: Seamless steel pipes don’t have welds, so their structure is more uniform. This gives them higher compressive strength. This makes seamless steel pipes more suitable in high-pressure and high-temperature environments.
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.
Suitable for high and low temperature environments: Seamless steel pipes are good for high and low temperature environments. They don’t crack easily.
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.

What standards do your seamless steel pipes comply with?

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 technical requirements, please contact us and we will discuss your requirements in depth.

How long is the production cycle of seamless steel pipes and how long does it take to deliver?

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

If the seamless steel pipe you ordered is in stock, we usually deliver the stocked products to the shipping port within 7 days.

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

How do I identify and prevent quality problems with seamless steel pipes?

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.

What is the standard length of seamless steel pipe?

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 according to your needs.

How to choose the seamless steel pipe specification suitable for a specific project?

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. In certain conditions, like extreme heat, pressure, or corrosive surroundings, special seamless steel pipes may be needed.

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:

Make sure 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 and opt for easy-to-maintain seamless specifications. This helps reduce maintenance costs in the future.

9. Comply with regulations and safety standards:

Make sure the seamless steel pipe specifications 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 project needs and advise you on performance and suitability. Plus, we’ll provide you with the best quote.

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