Seamless Steel Pipe
Seamless steel pipe is a pipe without any welded joints or seams. The seamless manufacturing process ensures that the pipe has a consistent structure and uniform dimensions throughout its length.
Gnee is committed to producing seamless steel pipes that meet international standards. We supply various materials and grades to the world, including carbon steel pipes, alloy steel pipes, oil casing, stainless steel pipes, galvanized steel pipes, etc. We also offer a range of machining services including cutting, bending, heat treatment, and surface treatment. Come and get a quote.
Hot Sale Seamless Steel Pipe Grades In stock
Seamless Steel Pipe for Different Applications
Seamless Structural Pipe Seamless Boiler Pipe Low Temperature Seamless Pipe Mechanical Seamless Steel Pipe
Various Seamless Steel Pipe Shapes For Sale
Round Tube Square Tube Rectangular Tube Oval Tube
Wide Seamless Steel Pipe Choices
We can provide various forms of seamless steel pipes at factory prices, including seamless carbon steel pipes, seamless alloy steel pipes, seamless API 5L steel pipes, etc. If you have any questions, please contact us.
Different Seamless Steel Pipe Sizes For Sale
Gnee Supplies A Wide Range Of Sizes. If You Don’t Find The Size That Meets Your Project Needs, Please Contact Us We Offer Customization Services.
More Seamless Steel Pipe information
Gnee factories have the largest inventory of steel pipes at its warehouse in Tianjin, China headquarters.
- UT (Ultrasonic examination)
- AR(As Hot Rolled only)
- TMCP(Thermal Mechanical Control Processing)
- N(Normalized)
- Q+T(Quenched and Tempered)
- Z Direction Test(Z15,Z25,Z35)
- Charpy V-Notch Impact Test
- The Third Party Test (such as SGS Test)
- Coated or Shot Blasting and Painting
Gnee Steel can provide the following processing services for alloy steel pipe:
- High-definition Plasma Cutting
- Oxy Profiling
- Flame Cutting
- Punching
- Drilling
- Tapping
- Bevelling
- Counter Sinking
- Counter Boring
General Parameters Of Seamless Steel Pipe
| Types | Uses |
| Structure Purposes | General structure and mechanical |
| Liquid Services | Petroleum, gas, and other fluids convey |
| Low and Medium Pressure | Steam and boiler manufacturing |
| Hydraulic Pillar Service | Hydraulic support |
| Auto Semi-shaft Casing | Auto sem-shaft casing |
| Line Pipe | Oil and gas conveying |
| Tubing and Casing | Oil and gas conveying |
| Drill Pipes | Well drilling |
| Geological Drilling Pipes | Geological drilling |
| Petroleum Cracking Tubes | Furnace tubes, heat exchangers |
| Standards | Grades | Class |
| API | API 5L | Line pipe for pipeline transportation systems |
| API 5CT | Tubing and casing for wells | |
| API 5DP | Drill Pipe for well drilling | |
| ASTM | ASTM A53 | Used as structural steel or for low-pressure plumbing |
| ASTM A106 | seamless carbon steel pipe for high-temperature service | |
| ASTM A335 | for seamless ferritic alloy-steel pipe for high-temperature service | |
| ASTM A213 | for seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes | |
| ASTM A179 | for seamless Cold-drawn low-carbon steel heat-exchanger and condenser tubes | |
| ASTM A192 | for seamless carbon steel boiler tubes for high-pressure service | |
| ASTM A210 | for seamless medium-carbon steel boiler and superheater tubes | |
| ASTM A333 | for seamless steel pipe for low-temperature service and other applications with required notch toughness | |
| ASTM A519 | for seamless carbon and alloy steel mechanical tubing | |
| ASTM A252 | for seamless and welded steel pipe piles | |
| DIN | DIN 17175 | for heat resistant seamless steel pipe lines |
| DIN 1629 | for seamless circular tubes of non alloys steels wth special quality requirements | |
| DIN 2391 | for cold drawn or cold rolled precision seamless steel tubes | |
| JIS | JIS G3454 | seamless carbon steel pipe for pressure service |
| JIS G3456 | seamless carbon steel pipe for high temperature service | |
| JIS G3461 | seamless carbon steel pipe for boiler and heat exchanger | |
| EN | EN 10210 | for hot finished seamless structural hollow sections of non-alloy steels |
| EN 10216 | seamless steel tubes for pressure purposes | |
| BS | BS 3059 | for carbon,alloy and austenitic stainless steel tubes with specified elevated temperature properties |
| Pipe types | Pipe Szie(mm) | Tolerances | |
| Hot rolled | OD | <50 | ±0.50mm |
| ≥50 | ±1% | ||
| WT | <4 | ±12.5% | |
| ≥4～20 | +15%, -12.5% | ||
| >20 | ±12.5% | ||
| Cold drawn | OD | 6～10 | ±0.20mm |
| 10～30 | ±0.40mm | ||
| 30～50 | ±0.45 | ||
| >50 | ±1% | ||
| WT | <1 | ±0.15mm | |
| >1～3 | + 15%, – 10% | ||
| >3 | + 12.5%, – 10% | ||
Excellent Features Of Seamless steel pipe
Gnee has been focusing on providing high-quality seamless steel pipes with a variety of excellent properties to customers around the world for 15 years. Come and get a quote now.
Why Choose Gnee Seamless Steel Pipe?
In addition, our seamless steel tubes have been successfully exported to more than 60 countries such as Vietnam, Malaysia, Indonesia, Pakistan, UAE, and South Korea, etc. Many regular customers visit our company and factory and make multiple orders.
What Services Does Gnee Provide?
Gnee can provide the following measurement services for pipe:
1. Dimensional measurement: Measure the dimensional parameters such as length, width, and thickness by measuring instruments to ensure the pipe is qualified and meets the design requirements.
2. Surface measurement: Measure parameters such as flatness, unevenness, and surface roughness of pipe surface to help ensure that the quality and surface state of the pipe meet the requirements.
3. Thickness measurement: Use a thickness measuring instrument to accurately measure the thickness of the pipe to ensure that it meets the design requirements.
4. Material measurement: Use material analysis instruments to measure the chemical composition and mechanical properties of the product to ensure that the quality and performance meet the requirements.
5. Bending and Deformation Measurements: The degree of bending and deformation of the steel pipe is measured and monitored by using tools such as bending measuring instruments and displacement sensors to ensure that it is within the allowable range.
Gnee can customize the size and shape of steel pipes for your project according to specific project needs. The custom design of the pipe is carried out by a professional engineer and design team. Based on the requirements and constraints of the project, they will use calculation and simulation tools, combined with experience and technical knowledge, to optimize the steel pipe design to meet the specific needs of your engineering.
● According to the strength requirements of structural design, adjust the thickness, width, and length of pipes.
● The shape of the steel pipe can be designed according to the characteristics of the project.
● If you consider the convenience of installation and maintenance, we can also add openings and passages for easy access and operation in the design for areas that require frequent maintenance.
Purchasing Gnee steel pipe can provide the following deep processing services. We can customize according to the specific needs of customers to meet the requirements.
Cutting service: Pipe can be custom cut to obtain the desired shape and size according to the needs of customers. For example, flame cutting, plasma cutting, laser cutting, etc., can cut steel pipes into required blocks, special-shaped parts.
Bending and forming: Pipes are bent and formed by stress application and appropriate processes to obtain the desired shape.
Welding service: Pipe can be subjected to various types of welding services, including manual arc welding, gas-shielded welding, laser welding, etc.
Turning and machining of holes: Turning and machining of holes in pipes by using machining equipment. These processes produce smooth surfaces, precise holes and threads to meet specific assembly requirements.
Surface treatment: In order to improve the corrosion resistance and aesthetics of the steel pipe, surface treatment can be carried out. This includes methods such as spraying, hot-dip galvanizing, electroplating, etc. to add a protective layer and provide corrosion resistance.
Gnee can provide the following testing services through third-party testing agencies. These third-party testing services can provide independent, objective verification that pipes comply with relevant standards and regulations.
Material chemical composition analysis: Through chemical composition analysis, determine whether the composition of the steel pipe meets the standard requirements.
Mechanical performance test: Mechanical performance test includes tensile test, impact test, bending test, etc., which are used to determine whether the mechanical properties such as strength, toughness and ductility of products meet the specified requirements.
Metallographic testing: Through metallographic testing, check the structure, grain size, non-metallic inclusions, etc. of pipes to evaluate their quality and performance.
Corrosion performance test: Through the corrosion performance test, evaluate the corrosion resistance of pipes, including salt spray corrosion resistance, chemical corrosion resistance, etc.
Hardness test: Hardness test is used to measure the hardness of pipe, and its strength and wear resistance can be evaluated according to the hardness value.
Ultrasonic flaw detection: Ultrasonic flaw detection is used to detect internal defects of pipes, such as cracks, pores, inclusions, etc.
What Are The Applications Of seamless Steel pipe?
Oil And Gas Industry
Seamless pipes are mainly used in the oil and gas industry to transport crude oil, natural gas and petroleum products. They are used in pipelines, offshore drilling, refining and petrochemicals. Tubes used in this industry are generally high strength carbon or alloy steel, corrosion resistant and high pressure resistant.
Automotive Industry
Seamless tubes are widely used in the automotive industry, especially in exhaust systems. It is generally made of stainless steel because of its high-temperature resistance, corrosion resistance, and vibration resistance. Seamless stainless steel exhaust systems improve engine power, reduce exhaust emissions, and also increase the life of the entire system.
Construction And Infrastructure
Seamless tubes are widely used in the construction industry. They are used in buildings, bridges, tunnels, and other infrastructure projects. Tubes can be building components such as columns and beams, and can also be used in plumbing, HVAC (heating, ventilation and air conditioning) and fire suppression systems.
For The Power
Seamless pipes have an important place in the power industry. They are used to transport steam, water and other liquids in conventional power plants and nuclear power plants. Seamless tubes are used in boilers, heat exchangers, steam turbines, etc. These tubes are generally made of alloy or stainless steel and can work in harsh operating environments.
