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We can produce wide range of steel flanges with outstanding quality.
MANUFACTURING STEEL PIPE FLANGES SINCE 2000
Shandong ZhongNuo Heavy Industry Co., Ltd. is one of the best manufacturers of forged Flanges in China. We manufacture various type of flanges that meet customers’ service and quality demands according to international standards, such as ASME/ ANSI B16.5 flanges, ASME/ ANSI B16.47 flanges, JIS flanges, DIN flanges, EN 1092-1 flanges, AWWA flanges, BS 4504 flanges, SABS/ ASNA 1123 flanges, etc., and we can also manufacture special flanges according to customers’ draws.
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We offer direct factory price and guarantee the high quality.
We have our own efficient and feasible quality management system to ensure quality control in every detail, from supply chain audit to bulk production to shipment.
Our order system makes it easy for us to keep track of the progress of each order, and ensure that all orders are shipped within the deadline.
Excellent after-sales service is an important factor in maintaining sustainable cooperation. We provide our customers with worry-free after-sales service to ensure that the problems you encounter are solved within 1-3 working days.
We mainly manufacture carbon steel and stainless steel flanges, commonly used materials are as follows:
Carbon steel flanges: A105, SS400, SF440 RST37.2, S235JRG2, P250GH, C22.8, etc.
Stainless Steel flanges: ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L
The manufacturing of forged flanges can be divided into 8 processes: Forging-Machining-Drilling-Deburring-Marking-Surface Treatment-Inspection-Packing. Each process must be designed to ensure the highest product qualification rate.
Get A QuoteA pipe flange is a piping component that connects to a piping system by using bolts and gaskets. A gasket is added between two flanges and then fastened with bolts. The most common types of flanges are weld neck flanges, slip on flanges, plate flanges, blind flanges, socket weld flanges, threaded flanges, lap joint flanges and RTJ flanges. Pipe flanges are usually made of carbon steel or stainless steel, through series of forging process, so it is also known as forged flange.
Forged flanges are widely used in petrochemical, chemical, nuclear industry, mining, oil and gas, construction, waterworks, etc. The dimensions of forged flanges are classified from 1/2″ to 60″, and pressure classified from 150# to 2500# or from PN6 to PN100.
Weld Neck flanges
This type of flange is the most widely used type in process piping, it is designed to be connected by a butt weld connection to the pipe. Weld neck flanges are used in high pressure and temperature applications.
Slip On Flanges
A slip-on flange is a connecting ring that slips over the end of a pipe. The flange is able to slide back and forth on the pipe for easy positioning, and both the inside and outside of the pipe need to be welded to the slip on flange. Slip on flange is suitable for low pressure and temperature applications.
Blind Flange
A blind flange is a solid flange with bolt hole. It is used to close the end of pipe or equipment. Blind pipe flange is also used as a manhole cover in the vessel.
Plate Flange
A plate flange is a flat, ring disc with bolt hole. This type of flange is welded to the end of a pipe and bolted to another pipe. Two plate flanges can be bolted together with a gasket between them. Plate flanges are suitable for low pressure and temperature applications.
Threaded Flange
Threaded / Screwed flanges are designed to connect flanges and pipes by means of threads. It means that the male threads of the pipe are screwed into the female threads of the flange to complete the connection of the piping process. Threaded flanges are suitable for low pressure and temperature applications.
Socket Weld Flanges
Socket weld flange (SW) is designed for small size and high-pressure pipeline, it has a socket end in flange bore for pipe to insert it and do fillet welding.
Lap Joint Flange
A lap joint flange (LJF flange) is also called loose flange, it has two components, a stub end and a loose backing flange. Stub end is butt welded to the pipe and backing flanges freely moves over the pipe. LJF flange is particularly used for frequent dismantling or hard-to-adjust pipe connection.
Ring Type Joint Flange (RTJ flange)
A Ring Type Joint Flange (RTJ flange) is a groove cut in the sealing surface of the flange. A softer steel ring gasket is placed in the groove, which creates a metal-to-metal seal when the gasket is in compression. This type of flange is designed for high-pressure and high- temperature piping applications.
Zhongnuo manufactures a wide variety of steel pipe flanges meeting following standards:
ASME/ANSI B16.5 flange
ANSI B16.47 flange
BS 4504 flange
DIN flange
EN 1092-1 flange
SANS/SABS 1123 flange
ASA flange
JIS flange
AWWA flange
GOST flange
Different standards and applications require for different type of sealing face on the flange. The sealing surface of the flange is usually machined with a certain roughness and place the gasket for better sealing.
The most used types are:
Raised Face (RF)
Flat Face (FF)
Ring-Type Joint (RTJ)
Male-and-Female (M&F)
Tongue-and-Groove (T&G)
For easy identification, the flange is marked with the corresponding parameters on the side, including brand name, size, pressure class, material, international standard, heat number, etc. We can also stamp according to customers special requirements.
The serrated flange surface means that concentric circular grooves or continuous spiral grooves are machined on the flange sealing surface. The main function is to increase the friction between the flange and the gasket to make a tighter connection between the pipe and the flange.
Usually, we machine flange serration with the groove width 0.8mm and groove depth 0.2-0.25mm, however we can also machine the serration on flange according to customers’ requirements.
We are a factory, and we offer factory direct prices with excellent quality and professional service.
Of course, you can come in person or hire a third-party organization to inspect our factory.
To ensure the integrity and safety of product packaging, products are packed in plastic film or export plywood boxes.
China has a much better industry chain. There may be manufacturers of steel flange in India, Vietnam and Malaysia, but Zhongnuo can guarantee that our prices can be on par with theirs and our quality, service far exceeds your expectations.
We can manufacture flanges according to your drawings, based on our many years of experience in the industry.
We offer you a 1-3 year warranty on our high-quality flanges.
We have been certified by TUV ISO9001, PED/AD2000, KR,KS certification bodies.
We offer EXW, FOB, CFR, CIF delivery terms.
You can come to inspect the goods in person, or you can hire a third-party inspector or agency to inspect the goods. In addition, all of our products are inspected to be qualified and issued test certificates before shipment.
Zhongnuo is a well-known manufacturer of carbon steel flanges, forgings and steel pipes with over 20 years of experience. Our strong capabilities and expertise enable us to meet the complex needs of our customers worldwide…
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