Seamless pipe manufacturing plays a vital role in modern industrial applications where high strength, reliability, and precision are essential. The seamless pipe production process generally involves two major techniques: the seamless pipe hot rolling process, which forms pipes at elevated temperatures, and the seamless pipe cold drawing process, which enhances dimensional accuracy and surface finish. Understanding these methods helps businesses select the right type of seamless pipe for their specific needs.
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Your Premier Source for Seamless Steel Pipe
A seamless steel pipe (SMLS, SMLS Pipe) is a long hollow cylindrical tube made without any welding or joints, offering superior strength, corrosion resistance, and pressure-bearing capacity for high-performance industrial applications. Manufactured through hot rolling, cold rolling, or cold drawing processes, seamless pipes are widely used in industries such as oil and gas, power generation, automotive, construction, chemical processing, and mechanical engineering. These pipes come in various materials, including carbon steel, stainless steel, and alloy steel, and are available in a full range of standards, sizes, wall thicknesses, and grades to meet different project specifications. From fluid transportation and structural support to high-temperature and high-pressure environments, seamless steel pipes deliver unmatched reliability and performance.
Are you feeling overwhelmed by the wide variety of seamless pipe options and unsure which type, standard, or material is best for your application? Look no further—Dexin Steel is your most reliable source in 2025 to buy high-quality seamless steel pipes made in China, offering factory-direct prices, custom solutions, global shipping, and expert technical support. At Dexin, you can explore all types of seamless steel pipe classifications with ease, ensuring you make the right choice for your business needs and project goals.
Reliable Seamless Steel Pipe Manufacturer
Since 2002, Dexin Steel Tube (China) Co., Ltd has been a trusted manufacturer of seamless steel pipes, delivering premium-quality products to global clients in the power, oil & gas, petrochemical, and energy sectors. With over 60,000 square meters of production facilities and a skilled workforce of 220 employees—including 20 technical engineers—we are equipped to meet demanding project requirements with efficiency and precision.
Work with us to enjoy competitive prices while ensuring quality. We comply with all export regulations to ensure a smooth transaction. Contact us now
Request a QuoteA Variety of Seamless Steel Pipes for You to Choose
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In Stock 
ASTM A106 Seamless Steel Pipe
ASTM A106 carbon steel pipe for high-temperature service. Withstands heat/pressure in power plant & refinery steam systems.
Type: carbon steel tube
OD：1/8’’(10.3mm)~48’’(1219mm)
WT： ≤ 5.91 inch(150mm)
L：6M~13M
In Stock 
ASTM A333 Low-Temp Seamless Steel Pipe
ASTM A333 Grade 6 (-196°C rating) pipe for LNG/cryogenic systems. Exceptional resistance to brittle fracture.
Type: carbon steel tube
OD：1/8’’(10.3mm)~48’’(1219mm)
WT： ≤ 5.91 inch(150mm)
L：6M~13M
In Stock 
GB/T8163 20# Seamless Steel Pipe
High-quality carbon structural steel per GB/T8163. Ideal for low/medium-pressure fluid conveyance & widely used in mechanical structural components.
Type: carbon steel tube
OD：1/8’’(10.3mm)~48’’(1219mm)
WT： ≤ 5.91 inch(150mm)
L：6M~13M
In Stock 
ASTM A335 P9 Alloy Seamless Steel Pipe
ASTM A335 Cr-Mo heat-resistant steel. Primary choice for refinery heater tubes in 593°C environments.
Type: alloy steel
OD：1/8’’(10.3mm)~48’’(1219mm)
WT： ≤ 5.91 inch(150mm)
L：6M~13M
In Stock 
ASME SA335 P5 High-Temp Alloy Seamless Steel Pipe
ASME SA335 mid-chromium alloy steel. Resists high-temp oxidation; essential for petrochemical cracking units.
Type: alloy steel
OD：1/8’’(10.3mm)~48’’(1219mm)
WT： ≤ 5.91 inch(150mm)
L：6M~13M
In Stock 
ASME SA335 Superheater Pipe
ASME SA335 modified 9Cr steel. For 620°C supercritical units with superior creep rupture strength.
Type: alloy steel
OD：1/8’’(10.3mm)~48’’(1219mm)
WT： ≤ 5.91 inch(150mm)
L：6M~13M
In Stock 
ASME SA335 P22 Chrome-Moly Pipe
ASME SA335 2.25Cr-1Mo steel. Sulfur corrosion-resistant; standard material for heat exchangers/reformers.
Type: alloy steel
OD：1/8’’(10.3mm)~48’’(1219mm)
WT： ≤ 5.91 inch(150mm)
L：6M~13M
In Stock 
GB/T5310 15CrMoG Alloy Seamless Steel Pipe
GB/T5310 high-pressure boiler tube. Chromium-molybdenum alloy withstands 540°C steam, critical for power plant components.
Type: alloy steel
OD：1/8’’(10.3mm)~48’’(1219mm)
WT： ≤ 5.91 inch(150mm)
L：6M~13M
In Stock 
GB/T18248 34CrMo4 Seamless Gas Cylinder
GB/T18248 certified high-strength Cr-Mo alloy steel. Designed for 20-30MPa CNG vehicle systems: fatigue/corrosion-resistant & reliable.
Type: alloy steel
OD：1/8’’(10.3mm)~48’’(1219mm)
WT： ≤ 5.91 inch(150mm)
L：6M~13M
In Stock 
API 5L PSL2 X70, X80 Large-Diameter Seamless Line Pipe
Deep-sea high-pressure oil/gas pipelines, arctic low-temperature pipelines, long-distance high-efficiency transmission trunk networks.
Type: line pipe
OD：1/8’’(10.3mm)~48’’(1219mm)
WT： ≤ 5.91 inch(150mm)
L：6M~13M
In Stock 
API 5L PSL1/PSL2 B, X42, X46, X52 Large-Diameter Seamless Line Pipe
Urban gas distribution networks, low-pressure water pipelines, onshore pipelines in non-corrosive environments.
Type: line pipe
OD：1/8’’(10.3mm)~48’’(1219mm)
WT： ≤ 5.91 inch(150mm)
L：6M~13M
In Stock 
API 5L PSL2 X56, X60, X65 Large-Diameter Seamless Line Pipe
High-pressure oil/gas transmission trunk lines (onshore), shallow subsea pipelines, transportation in moderately corrosive environments.
Type: line pipe
OD：1/8’’(10.3mm)~48’’(1219mm)
WT： ≤ 5.91 inch(150mm)
L：6M~13M
Standards for Seamless Steel Pipes Provided by Dexin
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Stainless Steel Pipe Series
- Stainless Steel Pipe
- Stainless Steel 304 / 304L / 304H Pipe
- Stainless Steel 310 / 310S Pipe
- Stainless Steel 316 / 316L / 316Ti Pipe
- Stainless Steel 317 / 317L Pipe
- Stainless Steel 321 / 321H Pipe
- Stainless Steel 347 / 347H Pipe
- Stainless Steel 410 Pipe
- Stainless Steel 904L Pipe
- Schedule 10 Stainless Steel Pipe
- Schedule 40 Stainless Steel Pipe
- Schedule 80 Stainless Steel Pipe
Carbon Steel Pipe Series
- Carbon Steel Pipe
- ASTM A53 Grade B Carbon Steel Pipe
- ASTM A106 Grade B Carbon Steel Pipe
- ASTM A333 Grade 6 Steel Pipe
- ASTM A671 Pipe
- ASTM A672 Pipe
- ASTM A179 Pipes
- ASTM A210 Pipes
- ASTM A572 Grade 50 Carbon Pipe
Alloy Steel & API Pipe Series
- Alloy Steel Pipe
- Alloy Steel A335 P1 Pipes
- Alloy Steel A335 P5 Pipes
- Alloy Steel A335 P9 Pipes
- Alloy Steel A335 P11 Pipes
- Alloy Steel A335 P22 Pipes
- Alloy Steel A335 P91 Pipes
API 5L Pipe
- API 5L Grade B Pipe
- API 5L X42 Pipe
- API 5L X46 Pipe
- API 5L X52 Pipe
- API 5L X60 Pipe
- API 5L X65 Pipe
Dexin Steel Tube (China) Co., Ltd
Professional Seamless Pipe Manufacturer
Get Product Catalog
2002
Year Established
60,000
Factory Area (m²)
20-30K
Monthly Capacity (tons)
220
Total Employees
Product Advantages
Specialized in large-diameter seamless pipes, maintaining 30,000 tons inventory covering carbon steel, alloy steel, stainless steel and more.
- Pipeline steel up to X80 grade
- Diameter below 1200mm
- Complete size range
- Fast delivery
Main Products
Professional production of various seamless pipes meeting high standards for petroleum, chemical, power and nuclear industries.
- Carbon steel pipes for pressure service
- Carbon steel pipes for high temperature
- Alloy steel boiler tubes
- Stainless steel pipes
- Steel pipes for low temperature
- Line pipes
Certifications
With complete quality management system, our products have safely operated over 100,000 hours with reliable quality.
- ISO 9001 Certified
- ISO 14001 Certified
- ISO 45001 Certified
- Sinopec Qualified Supplier
- CNPC Class A Supplier
How Seamless Steel Pipes Are Made
Seamless Pipe Hot Rolling Process
Hot rolling is a manufacturing process where a solid billet is heated above its recrystallization temperature and then rolled into a seamless pipe. This method is ideal for producing large-diameter pipes and offers good ductility and surface finish. It’s widely used for applications that don’t require tight tolerances.
Seamless Pipe Cold Drawing Process
Cold drawing involves pulling a hot-rolled pipe through a die at room temperature to reduce its diameter and wall thickness. This process improves dimensional accuracy, surface quality, and mechanical strength, making it suitable for precision applications.
In conclusion, seamless pipe manufacturing is a complex yet essential process that ensures the production of high-quality steel pipes used across numerous industries. Whether it is the efficient hot rolling process or the precise cold drawing process, Dexin can provide you with products that meet your needs!
Investments
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Electric Power Field -
Petroleum Field -
Chemical Industry -
Storage -
Nuclear Power Field
Why Choose Us
Professional Manufacturing
Relying on advanced technology and mature processes, focusing on high-precision and high-strength seamless steel pipe manufacturing.
Ten Thousand Tons of Inventory
30,000 tons of steel pipe inventory throughout the year, covering carbon steel, alloy, and stainless steel
Supply Chain Dual Engines
Integrate production and inventory resources to ensure zero delays and zero interruptions in project supply.
Full Specification Group
Provide full group sizes and diversified steel grade options to adapt to complex engineering scenarios.
Extreme Speed Delivery
Optimize production and logistics links to achieve industry-leading short-cycle delivery capabilities.
Pipeline Steel Specialization
Support X80 and below grade pipeline steel production, maximum adaptability to 1200mm caliber applications.
FAQs
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Q1: What is a seamless steel pipe?
A seamless steel pipe is a type of pipe made without any welded seams. It is manufactured by extruding the metal to the desired length and thickness, making it ideal for high-pressure, high-temperature, and corrosive applications.
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Q2: What are the advantages of seamless steel pipes compared to welded pipes?
Seamless pipes offer superior strength, uniform structure, better pressure resistance, and no risk of seam failure. They are also preferred for precision applications and harsh environments.
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Q3: Do you serve international customers?
Yes. We export to clients in North America, Southeast Asia, the Middle East, and Europe. We are also qualified suppliers to Sinopec, CNPC, CNOOC, and other major EPC contractors and industrial companies.
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Q4: What standards do your seamless steel pipes comply with?
Our products comply with international standards such as ASTM, ASME, API, DIN, EN, and GB/T. Common grades include ASTM A106, A333, API 5L, A335 P11/P22/P91, and others.
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Q5: Can I request custom sizes or grades?
Yes. As a manufacturer, we support custom orders based on your required dimensions, wall thickness, material grade, and quantity. Please contact our team for a quote or technical consultation.
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Q6: What is your production capacity and delivery time?
Our factory produces 20,000–30,000 tons per month with over 30,000 tons of stock available year-round. For in-stock items, we can arrange quick shipment; custom orders usually take 15–35 days depending on specifications.