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Round tubes Focusing on seamless steel pipes for 22 years, we are the source factory and look forward to cooperation. Introduction to Round Tubes： The rounded cross-section structure gives the tube a unique mechanical advantage, and compared with other shapes of the tube, it exhibits a more balanced force distribution when subjected to internal pressure, external pressure and axial load.
Carbon steel pipe features:

• Ultra-high precision dimensional control: We strictly limit the outer diameter tolerance to a very small range, and the roundness error is accurately controlled at ±0.2mm, which makes the round steel pipe perfectly fit with all kinds of accessories, greatly reducing the possible errors in the installation process, and effectively improving the overall efficiency and quality of the project.
• Uniform and stable force performance: The circular cross-section makes the pipe uniform and consistent in force, which can withstand large pressure and tensile force and is not easy to deform. In key application scenarios such as high-pressure fluid transportation pipeline systems and large-scale building structure support, it ensures the safe operation of engineering projects.
• Excellent fluid conveying performance: The inside of the pipe is smooth, and the resistance generated when transporting various fluids such as oil, natural gas, and water is very small, which effectively reduces energy consumption and significantly improves the fluid conveying efficiency.
• Rich and diverse material options: We provide carbon steel, alloy steel and other materials of round steel pipes. Carbon steel material has good cost-effectiveness and is widely used in general construction and machinery manufacturing; by adding special alloying elements, alloy steel greatly enhances the high temperature resistance and corrosion resistance of the pipe, making it an ideal choice for chemical, electric power and other industries.

Application of round tubes： The round pipes produced by our company are mainly used in the following fields:

• In the field of construction engineering: Circular steel pipes are used as the main structural support materials in construction projects, and are widely used in the construction of bridges, gymnasiums, high-rise buildings, and other large building structures.
• Petrochemical industry: round steel pipes are widely used in key parts such as oil and gas pipelines, oil well pipes, and chemical reactor pipelines. Its good corrosion resistance and excellent fluid transfer performance fully meet the stringent quality and performance requirements of the petrochemical industry for pipes.
• Machinery manufacturing industry: Circular steel pipes play an important role in the manufacturing process of various types of machinery and equipment, such as the manufacture of key components such as hydraulic cylinder barrels, cylinder barrels, and transmission shafts.
• Automobile manufacturing industry: Round steel pipes are widely used in key components such as automobile engines, transmissions, and braking systems, which can meet the strict standards of the automobile manufacturing industry for the dimensional accuracy, strength and corrosion resistance of the tubes, and provide a strong guarantee for the high performance and safety of automobiles.
• Electric power industry: Circular steel pipes are used in the towers of power transmission lines, the structure of substations and cable protection sleeves, etc., with their good conductivity and mechanical strength, they can withstand harsh natural environments and electrical loads to ensure the safe and stable operation of the power system.

Specifications and Standards

Specification	Details
Outer Diameter Range	20~325mm
Wall Thickness Range	2~40mm
Length Range	Customised lengths according to customer requirements.
Material Grades	Q345b, 20cr, 40cr, 15crmo. 42crmo, 27simn, 12cr1mov, 15crmog. 12cr1movg, etc.
Standards	ASTM A335、 GB/T8163、EN 10297-1

Product advantages 

• Diversified and all-round production system ：We have built a diversified production system, covering advanced production lines such as hot expansion, hot rolling, cold rolling, cold drawing, centrifugal casting, CNC machine tools, etc. Each production line is equipped with cutting-edge equipment and mature technology, accurately controls the production process, and efficiently produces high-precision and high-quality products to meet the diverse needs of various industries.
• Direct supply from the source factory: As the source factory of centrifugal casting, we eliminate all intermediate links and directly deliver the products from the factory to the customer. Dramatically reduced product costs, allowing you to obtain high-quality centrifugal casting products at a low price, as well as more direct and rigorous control of the production process to ensure consistent product quality.
• Strict quality control system: We build a whole-process quality control system. Strict testing when purchasing raw materials to ensure that the ingredients and performance meet the standards; Multi-channel detection gates are set up in production to monitor the dimensional accuracy, mechanical properties and surface quality of products in real time; The product is fully inspected before leaving the factory, so that you can rest assured.
• Perfect after-sales: We will pay regular visits to help customers solve problems and continue to improve.

Customer feedback Customer name: An oil company
Country: Germany
Feedback: “I am very satisfied with the delivery time, I originally thought that the custom specifications would delay the time, but I didn’t expect you to ship the goods so quickly. The goods arrived in time, and our construction progress was not delayed at all, thank you!” Customer Name: Shipyard
Country: Japan
Feedback: “The quality of the goods sent every time is very stable, the specifications are the same as our requirements, the price is fair, the cost performance is quite high, and we will continue to cooperate.” Customer industry: Construction engineering company
Country: Canada
Feedback： “The tube was used as soon as I received it, and the quality was very good, the wall thickness was uniform, and the surface was smooth and there were no blemishes. The people in our project department said that this batch of goods is good, and they will ask you to order it if there is a demand in the future.”
Customer industry: Machinery manufacturing
Country：United Kingdom
Feedback: “This is our first time working with your company, and we are very satisfied with the product quality and service attitude. The dimensional accuracy of the seamless steel pipe is very high, which fully meets the needs of our steel structure project. We look forward to more cooperation opportunities in the future!”