BLIND FLANGE
Founded in 2013, Yantai Xinbaoshang Materials Technology Co., Ltd.
China's leading pipe flanges supplier
Blind flanges are primarily used to seal the ends or openings of pipelines. Unlike standard flanges, blind flanges have no internal bore, effectively preventing the flow of fluids. They are commonly used in applications requiring pipeline isolation or maintenance. Manufactured from materials such as carbon steel, stainless steel, or alloy steel, the production process involves forging and machining to ensure the flange’s thickness and strength meet specific pressure requirements. The outer edge of the flange is equipped with bolt holes for secure connection to pipes or other flanges. Due to their ability to withstand high pressure and provide excellent sealing performance, blind flanges are widely used in industries such as petroleum, natural gas, chemicals, and power, particularly in situations where temporary closure of pipes or equipment is required.
As a leading manufacturer and supplier of blind flange products in China, our products cover most application scenarios in terms of size and standards. Our products strictly comply with international standards such as ASTM. If you have any other requirements for product specifications, please feel free to contact us for customization.
| Size Range | 1/2″ to 60″ |
| Standards | ASME B16.5 , ASME B16.47 , etc. |
| Carbon & Low-Temp Steel | ASTM A105 , ASTM A350 |
| Nickel Alloys | ASTM B564 |
| Stainless / Duplex / Super Duplex Steel | ASTM A182 |
Our deeply integrated pipe fitting/flange production base currently has an annual production capacity of 700,000 tons and is a high-tech enterprise specializing in the research, development, and manufacturing of pipeline-related accessories. We primarily produce various types of pipe fittings made of carbon steel and stainless steel, including elbows, tees, reducers, etc., as well as slip-on flanges, weld neck flanges, and other flange products. All products strictly adhere to international standards such as ISO, API, ASME, and EN to ensure exceptional quality and reliable performance. Currently, our products are widely applied in numerous large-scale energy projects for global clients, providing reliable pipeline connection solutions.
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.
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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.
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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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On July 28, 2025, we formally signed a 2,000-ton seamless steel pipe contract with our Italian client. This order complies with the EN10216-2 P235GH s…
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On July 28, 2025, we formally signed a 2,000-ton seamless steel pipe contract with our Italian client. This order complies with the EN10216-2 P235GH s…
We have successfully fulfilled a 1,000-ton order for seamless steel pipes from our South Korean client. The customer has expressed high praise for our product quality and delivery speed, further solidifying our cooperative relationship.
On the occasion of the National Day and Mid-Autumn Festival double holiday, Yantai Xinbaoshang expressed gratitude and care for its employees through heartwarming activities and special benefits, uniting the team to jointly wish our nation prosperity and a bright future.
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.
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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