SEAMLESS STEEL PIPE (SMLS PIPE)
Founded in 2013, Yantai Xinbaoshang Materials Technology Co., Ltd.
China's leading seamless steel pipe manufacturer and supplier
Seamless steel pipes (SMLS pipe) are manufactured through hot-rolling or cold-drawing processes, where solid steel billets are pierced and formed into pipes in a single piece. The tube body has no weld seams or weld points. This production method significantly reduces stress, resulting in uniform wall thickness and relatively high overall strength. Therefore, seamless steel pipes are highly suitable for high-temperature, high-pressure working environments, as well as corrosive extreme environments. Seamless steel pipes are produced using various manufacturing processes, including hot-rolled, cold-rolled, and cold-drawn, and are available in different materials such as carbon steel, stainless steel, and alloy steel. Due to their excellent mechanical properties, they are widely used in fields such as energy transmission, oil extraction, and industrial manufacturing.
Carbon steel seamless pipes are primarily composed of iron-carbon alloys and do not contain other alloying elements. Based on carbon content, they can be classified into low-carbon steel, medium-carbon steel, and high-carbon steel. As carbon content increases, strength and hardness improve, but ductility and weldability decrease. Carbon steel seamless pipes offer excellent strength and toughness, capable of withstanding high pressure loads. They also exhibit good machinability and weldability, making them widely applicable. The disadvantage of carbon steel is its relatively poor corrosion resistance, making it susceptible to oxidation and corrosion in humid or extreme environments. Therefore, in certain extreme operating conditions, secondary treatments such as epoxy coating or hot-dip galvanizing are typically required to enhance durability. Due to its relatively low cost and reliable performance, carbon steel seamless pipes are extensively used in industries such as construction, machinery manufacturing, and oil and gas transportation.
Stainless steel seamless pipes are primarily made from carbon steel with the addition of chromium alloy elements to enhance their corrosion resistance and high-temperature resistance. The higher the chromium content, the stronger the corrosion resistance. This material has a smooth surface and excellent oxidation resistance, capable of withstanding corrosion from various chemical substances. It performs exceptionally well in extreme environments such as humid or corrosive soils, making it suitable for a wide range of high-demand applications, including chemical processing, food processing, pharmaceuticals, and marine engineering. It is particularly important in medical devices and the food industry. Although stainless steel seamless pipes have relatively high costs, their high durability and low maintenance costs make them an ideal choice for many specialized applications.
Alloy steel seamless steel pipes are manufactured by adding other alloy elements (such as chromium, nickel, molybdenum, tungsten, etc.) to an iron-carbon alloy base. Stainless steel is also a type of alloy steel. The primary characteristics of this material are its excellent strength, toughness, and wear resistance, enabling it to perform exceptionally well under high-temperature, high-pressure, corrosive, and extreme environmental conditions. Alloy steel seamless steel pipes are designed to meet specific application requirements and are commonly used in industries such as petroleum, natural gas, chemicals, aerospace, and nuclear energy. Alloy steel seamless steel pipes offer higher safety and reliability. Due to their unique composition and production process, alloy steel seamless steel pipes typically have higher costs. However, their long-term durability and performance advantages make them an indispensable material in many high-end applications.
SMLS pipe (seamless pipe) and Welded pipe are two distinct types of piping, each with unique characteristics and applications. SMLS pipe is manufactured directly from steel billets through hot-rolling or cold-rolling processes, resulting in a seamless structure that delivers superior pressure-bearing capacity and corrosion resistance. It is particularly well-suited for petroleum, natural gas extraction, and chemical industries. In contrast, Welded pipes are formed by welding steel plates or coils. This welding process enables lower production costs and higher efficiency, making it suitable for mass production. Welded pipes also offer a wider range of sizes. They are widely used in applications such as medium-to-low pressure fluid transportation, construction, and support structures.
As a leading manufacturer and supplier of seamless steel pipe products in China, our products cover most application scenarios in terms of size and standards. Our products strictly comply with international standards such as API and ASTM. If you have any other requirements for product specifications, please feel free to contact us for customization.
| Outer Diameter Range | 6mm – 1200mm |
| Wall Thickness Range | 2mm – 120mm |
| Length Range | SRL , DRL , fixed length such as 6m , 12m , etc. |
| Carbon steel pipes | API 5L , ASTM A53/A53M , ASTM A106/A106M , ASTM A179/A179M , ASTM A192/A192M , ASTM A210/A210M , ASTM A333/A333M , ASTM A519 , ASTM A524/A524M , EN 10210-1 , EN 10216-2 , EN 10216-4 , EN 10255 , EN 10297-1 , DIN 1692 , DIN 17175 , JIS G 3444 , JIS G 3445 , JIS G 3454/3455/3456 , JIS G 3460 , etc. |
| Stainless steel pipes | ASTM A213/A213M , ASTM A268/A268M , ASTM A269/A269M , ASTM A312/A312M , ASTM A688/A688M , ASTM A803/A803M , EN 10216-5 , EN 10296-2 , JIS G 3459 , JIS G 3463 , JIS G 3446 , etc. |
| Alloy steel pipes | ASTM A213/A213M , ASTM A335/A335M , etc. |
We have two pipe product manufacturing bases in Yantai, Shandong Province. One of them, the General Pipe Manufacturing Base, has a history of nearly 70 years and is equipped with five hot-rolling production lines and one cold-drawing production line, with an annual production capacity of up to 500,000 tons. Leveraging our mature production processes and economies of scale, our product range encompasses over 1,000 specifications of pipe products, fully compliant with international standards such as API 5L, ASTM A106, and ASTM A333. While ensuring quality, we also offer a leading price advantage.
Our high-standard pipeline product production base has a stable production capacity of 800,000 tons, primarily producing high-grade steel products such as API 5L X100 PSL2, API 5CT Super 13Cr, and ASTM A335 P91. Our product specifications cover a wide range, with a maximum outer diameter of 20 inches, a wall thickness of up to 70 millimeters, and a single-piece length of up to 36 meters, capable of meeting the demands of steel pipes in various harsh operating conditions.
FAQs
We have no minimum order quantity requirements. Even if you only need one steel pipe or one pipe fitting, we can deliver on time and provide comprehensive services. Please note that certain high-grade steel products may require temporary production scheduling, which may result in minimum order quantity requirements. For specific details, please consult our sales team.
Of course, we provide free samples for products priced below $1,000. You only need to cover the shipping costs. For products priced above $1,000, please contact our sales team to discuss specific fees.
For products that are in stock, we will complete the final processing, quality inspection, packaging, and other steps within two weeks and deliver them as soon as possible according to the shipping schedule. For products that need to be ordered for production, an additional 2-3 weeks of production time will be required depending on the quantity requested.
In addition to providing factory warranty certificates, we can also provide test reports from internationally recognized quality testing agencies such as SGS, TUV, and DNV upon customer request. We are also available to assist third-party testing agencies with process inspections and final inspections prior to shipment.
Of course! Whether it's our own factory, processing plant, or our partners' factories, we welcome you to visit and exchange ideas at any time. If you need our assistance with visa matters, please feel free to contact our sales manager.
We are both a supplier and a manufacturer. We have three processing plants and warehouses, as well as a seamless steel pipe factory. We also collaborate closely with other outstanding steel pipe and pipe fitting factories in China, enabling us to offer a wide range of product specifications and a complete product system.
The delivery of the product is just the beginning of our service. If you encounter any issues during use, please feel free to contact our online customer service team at any time, and we will address the matter promptly. Additionally, we have offices in Hong Kong, Thailand, and Malaysia, enabling us to provide on-site technical support as needed.
Resource integration and supply chain capabilities are our core strengths. We offer a wide range of product specifications and numerous product types. At the same time, our inventory and processing capabilities ensure the fastest delivery times. We also provide professional customized solutions and comprehensive after-sales service.
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A comprehensive supply chain system and resource integration capabilities are our core strengths. By establishing long-term, in-depth partnerships with numerous outstanding factories, we have built a complete product system, ensuring that you can purchase all supporting products in one place, thereby saving a significant amount of time and cost. With our deep understanding of the local market and long-term, stable procurement volume, we are able to provide the highest quality products at the same price point, helping you maintain a competitive edge in the fiercely competitive market.
We have a professional team of more than 20 people and extensive experience in international projects. We can tailor solutions to your specific needs and provide quick quotes. We have three leading steel pipe product processing plants in Yantai, Shandong and Cangzhou, Hebei, which can meet all your deep processing and customization needs.
VIEW MORE Quality is our core principle. All products undergo comprehensive quality inspections before leaving the factory. After being stored in our warehouse, we conduct rigorous secondary quality inspections and can provide specified quality inspection plans according to customer requirements. We ensure that our product quality far exceeds contract standards and international standards.
VIEW MORE With a standing inventory capacity of 35,000 tons and a leading supply chain advantage, we achieve the fastest delivery times in the industry. We have offices in Hong Kong, Thailand, and Malaysia to ensure timely after-sales support for our customers. Our goal is to establish long-term partnerships with our customers, grow together, and create greater value.
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We successfully secured a 500-ton order for seamless steel pipes with our Turkmenistan client. Through efficient land transportation, the shipment was delivered smoothly. The client highly praised our product quality and service, further solidifying our long-term cooperative relationship.
On September 3, 2025, Xinbaoshang Company hosted a warm birthday celebration for Jessica, showcasing our “people-oriented” corporate culture. We wish her both professional and personal success in the coming year!
On September 3, 2025, the military parade marking the 80th anniversary of the victory in the War of Resistance Against Japanese Aggression, held at Tiananmen Square in Beijing, not only highlighted the significant contributions made by the Chinese people in the fight against fascism but also profoundly embodied the spirit of the nation, inspiring us to remember history and look toward the future.
The United States plans to impose a 50% tariff on Indian goods starting August 27. This move stems from India’s imports of Russian oil and may have far-reaching implications for U.S.-India trade relations and the global economy.
We successfully secured a 500-ton order for seamless steel pipes with our Turkmenistan client. Through efficient land transportation, the shipment was delivered smoothly. The client highly praised our product quality and service, further solidifying our long-term cooperative relationship.
On September 3, 2025, Xinbaoshang Company hosted a warm birthday celebration for Jessica, showcasing our “people-oriented” corporate culture. We wish her both professional and personal success in the coming year!
On September 3, 2025, the military parade marking the 80th anniversary of the victory in the War of Resistance Against Japanese Aggression, held at Tiananmen Square in Beijing, not only highlighted the significant contributions made by the Chinese people in the fight against fascism but also profoundly embodied the spirit of the nation, inspiring us to remember history and look toward the future.
The United States plans to impose a 50% tariff on Indian goods starting August 27. This move stems from India’s imports of Russian oil and may have far-reaching implications for U.S.-India trade relations and the global economy.
Our steel pipe products have been widely used in major energy projects around the world, serving international energy giants, including China National Petroleum Corporation, Sinopec, Shell, Total, as well as national oil companies from countries such as Kuwait, Azerbaijan, Abu Dhabi, Qatar, Algeria, and Saudi Arabia. We have accumulated rich experience in international project services.
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