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Frequently asked questions

Yes, we are a flange pipe fittings manufacturer located in Cangzhou, Hebei, China. Founded in 2000, we cover an area of ​​150,000 square meters, with a building area of ​​30,000 square meters. We currently have more than 300 employees and are a relatively large and powerful Chinese flange manufacturer.

The company has 8 pipe fittings production lines and 5 flange production lines. It has a full set of medium-frequency elbow hot push machines, reducer hot mold presses, tee cold extrusion hydraulic presses, forging hammers, vertical lathes, drilling machines and other processing and machining equipment. Among them, the φ1020 mm large-diameter medium-frequency hydraulic push machine, φ1420 mm large-diameter medium-frequency bending machine, and φ2438 mm 4,000-ton large-scale hot mold press have an annual production capacity of more than 80,000 tons.

For standard models, our factory has a large inventory, and the delivery time is usually only a few days. For non-standard parts, we also have a large reserve of raw materials and multiple production lines, which will save one-third of the time compared to other manufacturers and ship them to you as soon as possible.

We have our own testing system. Each batch of goods will have a corresponding product certificate and quality inspection report. At the same time, we have ISO9001 product quality certification, classification society certificate, ASNE quality certificate and other international authoritative quality certification certificates. We will never ship out unqualified products. In addition, we support customers to entrust third-party inspection companies for inspection and acceptance.

Of course, you can provide us with drawings or samples for customization, or you can ask us to design and customize your exclusive flange pipe fittings for you. Learn More>>

Our products are used in oil, gas, chemical industry, machinery, shipbuilding, aerospace, electricity, pharmaceuticals, construction engineering, water conservancy engineering, and marine engineering. Don’t worry about some special fields with high requirements. We have strong production capacity and rich production experience and can provide you with professional solutions. You can send us your working conditions and we can give you a solution for free.

Our company can provide you with samples for free, you can contact sales to request samples.

Of course, you are very welcome to visit our factory. We will also arrange meals and accommodation for you. If you have enough time, we can also take you to visit China’s famous mountains and historical sites, so that you can better understand China and our culture. It will be worthwhile and we look forward to seeing you.

We are the source manufacturer. If you have the strength, you will get more favorable prices, faster delivery and more guarantees if you purchase directly from us. We will have professional sales staff to track customers’ orders throughout the process, update the order status in real time, and let customers know their order progress and product quality in real time.

We support payments in over 40 currencies worldwide.

We have a long-term logistics transportation company that supports sea, land and air transportation to ensure that customers receive the goods on time. At the same time, if customers have a cooperative logistics company, we will still fully cooperate with your logistics company to ensure that customers can receive the goods as soon as possible.

Product

Common flange materials include carbon steel, stainless steel, alloy steel, etc.

Carbon steel flanges are low in cost and high in strength, suitable for general working conditions; stainless steel flanges have good corrosion resistance and are often used in places where the medium is corrosive to a certain extent; alloy steel flanges can provide better performance under harsh conditions such as high temperature and high pressure.

Carbon steel flanges have high strength but relatively weak corrosion resistance; stainless steel flanges have strong corrosion resistance and beautiful appearance, but the price is relatively high, and different types of stainless steel also have different corrosion resistance and mechanical properties. For example, 304 stainless steel flanges are suitable for general corrosive environments, while 316 stainless steel flanges are more resistant to highly corrosive media such as seawater; alloy steel flanges have good high temperature strength and fatigue resistance, and can withstand higher pressures and temperatures, but they are more difficult to process and more expensive.

The flanges we produce are of various sizes and specifications, ranging from DN10 to DN5000, to meet the needs of different customers. At the same time, we can also customize non-standard flanges according to the special requirements of customers.

We ensure the quality of flanges from many aspects. First of all, when purchasing raw materials, we only use steel from high-quality steel mills with quality certificates.

Secondly, during the production process, we strictly follow the standard process to perform hot forging, heat treatment and other processes, such as hot forging according to NB/T47008-2010 and other standards according to different materials.

Furthermore, we are equipped with advanced testing equipment to conduct geometric dimension inspection, appearance inspection, hardness inspection, mechanical inspection, spectral analysis, non-destructive testing and other physical and chemical inspections on the finished flanges to prevent the outflow of unqualified products.

Flanges come in a variety of sizes, with common nominal diameters ranging from DN10 to DN5000. Different nominal diameters correspond to different outer diameters, bolt hole spacing, bolt diameter, number of bolt holes, flange thickness and other specific dimensions.

For example, in the national standard flange, the outer diameter of a DN15 flange is 95mm, the bolt hole spacing is 65mm, the bolt diameter is 14mm, the number of bolt holes is 4, and the flange thickness is 14mm.

Our factory can customize non-standard sizes and special-purpose flanges according to the special requirements of customers.

Flanges of different standards differ in size, pressure rating, and sealing surface form. For example, under the pressure of 150LB, the ANSI flange has a size division of 1/2 inch to 24 inches, while under the pressure of 300LB, the ANSI flange also has a size division of 1/2 inch to 24 inches, but the data of each part is different under the same size and different pressures.

National standard flanges are formulated according to relevant standards of my country and are widely used in domestic projects. Japanese standard flanges also have their own characteristics in size and some details, and are used in Japan and some projects using Japanese technology.

When choosing, it is necessary to determine which standard flange to use based on the specific use environment and supporting requirements.

Common flange sealing surface forms include flat sealing surface, concave-convex sealing surface, tongue-and-groove sealing surface, etc.

Flat sealing surface has a simple structure and is easy to process, and is suitable for occasions with low pressure and non-toxic media; concave-convex sealing surface has better sealing performance and can withstand higher pressure, but requires higher processing accuracy; tongue-and-groove sealing surface has the best sealing performance and is often used in occasions with strict sealing requirements, such as pipeline connections for flammable, explosive, and toxic media.

Price and cost

The price of flanges is usually determined by many factors, including material, specification size, pressure level, standard, surface treatment method, and market supply and demand.

Generally speaking, the price of stainless steel flanges is relatively high, while the price of carbon steel flanges is relatively low; the price of large-diameter, high-pressure-level flanges will be more expensive than small-diameter, low-pressure-level flanges; the price of special standard or customized flanges will also be higher than that of ordinary standard flanges.

In addition, changes in market supply and demand will also affect prices. When market demand is large and supply is tight, prices may rise, and vice versa.

For customers who purchase in large quantities, we will give certain preferential policies based on the purchase quantity, payment method and other specific circumstances, such as price discounts, freight subsidies, etc. You can contact our sales staff to discuss purchase matters in detail, and we will provide you with the most favorable plan and quotation.

After-sales service

Our factory’s after-sales service includes product quality assurance, technical support, product return and exchange, etc. If you find any quality problems with the product during use, we will provide free repair, replacement and other services according to the specific situation; we also have a professional technical team to provide you with technical consultation and solutions; if you are not satisfied with the product, we can handle the return and exchange procedures for you in accordance with relevant regulations.

You can contact our after-sales service staff by calling our after-sales service hotline [+86 13313073735] or sending an email to [flanges.yh@gmail.com]. We will provide you with help and solutions as soon as possible after receiving your consultation or feedback.

Production process and quality control

Our factory uses advanced production processes and equipment, such as forging, casting, stamping and other processes combined to ensure the quality and performance of the flange.

During the forging process, by reasonably controlling the forging temperature, pressure and other parameters, the internal structure of the flange is made denser, and its strength and toughness are improved; the casting process can produce flanges with complex shapes to meet the personalized needs of customers; the stamping process has the advantages of high production efficiency and high product dimensional accuracy.

At the same time, we are also equipped with professional testing equipment and personnel to conduct strict quality inspections on the flanges to ensure that every flange shipped meets the relevant standards and customer requirements

We have established a strict quality control system from raw material procurement, production and processing to finished product inspection. In the raw material procurement stage, we only use high-quality steel and require suppliers to provide quality certification documents; in the production and processing process, we strictly follow the process documents and operating procedures to ensure that each process meets the quality requirements; in the finished product inspection stage, we use non-destructive testing, physical and chemical performance testing and other testing methods to conduct comprehensive inspections on the flange’s dimensional accuracy, appearance quality, mechanical properties, sealing performance, etc. Only qualified products can be shipped.

Common flange surface treatment methods include galvanizing, nickel plating, chrome plating, and painting. Galvanizing can improve the corrosion resistance of the flange and extend its service life; nickel plating and chrome plating can make the flange surface more beautiful and improve its corrosion resistance and wear resistance; painting can provide flanges of different colors according to customer requirements, which plays a role in identification and protection.

Application and Installation

Flanges are widely used in many industries such as petroleum, chemical, electric power, metallurgy, pharmaceutical, and food. In the petrochemical industry, they are used to connect various pipelines and equipment; in the electric power industry, they are used to connect pipelines of generator sets, boilers and other equipment; in the metallurgical industry, they are used to connect pipelines for transporting gas, oxygen and other media; in the pharmaceutical and food industries, flanges that meet hygiene standards are required to ensure product quality and safety.

The main installation methods of flanges include welding and bolting. Welded flanges have the advantages of firm connection and good sealing performance, and are suitable for important occasions such as high pressure and high temperature; bolted flanges have the advantages of easy installation and easy disassembly, and are suitable for medium and low pressure and normal temperature pipeline systems. During the installation process, attention should be paid to the centering of the flange, the selection and installation of the gasket, the tightening torque of the bolts, etc., to ensure the connection quality and sealing performance of the flange

When selecting flange gaskets, factors such as the nature, pressure, and temperature of the medium need to be considered. For general media such as water and steam, rubber gaskets or asbestos rubber gaskets can be selected; for corrosive media, corrosion-resistant materials such as polytetrafluoroethylene gaskets should be selected; for high temperature and high pressure occasions, metal gaskets or metal spiral wound gaskets with good sealing performance and high temperature resistance are required.

During use, it is necessary to regularly check whether there are leakages, looseness, etc. at the connection parts of the flange. If there are any problems, they should be dealt with in time. At the same time, attention should be paid to the temperature and pressure changes of the medium to avoid exceeding the rated use range of the flange. For flanges that are used for a long time, regular maintenance and care are also required, such as cleaning, lubrication, anti-corrosion, etc., to extend their service life.