E-mail: authentic013@steelpipes-fitting.com
WhatsApp: +86 13668807131
E-mail: authentic013@steelpipes-fitting.com
WhatsApp: +86 13668807131
Feb. 11, 2026
Flange Types and Standards
Flanges, also known as flange plates or flanges, are mainly manufactured through four processes: forging, casting, cutting, and rolling. Die forging is the most commonly used method. Die forging, also known as die forging, involves placing a heated blank into a die fixed on forging equipment to form the flange.
I. Flange Classification:
Common flange types include: flat plate flanges, neck flat plate flanges, neck welding flanges, socket welding flanges, threaded flanges, loose fit flanges, and flange covers.
Common size range: 1/2” (DN15) - 24” (DN600).
European standard nominal pressure is expressed in PN, including nine grades: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, and PN160. The American Standard for Pressure Ratings (ASM) uses the CLASS designation, including six levels: CLASS 150, CLASS 300, CLASS 600, CLASS 900, CLASS 1500, and CLASS 2500.
Plate-face sliding flanges (PL): Materials are readily available, manufacturing is simple, cost-effective, and they are widely used.
Sealing face types: Flat face (FF) and raised face (RF).
Slip-on flanges with necks (SO): A type of flange that connects steel pipes, fittings, etc., to equipment or pipelines via fillet welds.
Sealing face shapes: Raised face (RF), concave face (FM), male face (M), tongue and groove face (T), groove face (G), flat face (FF).
Welded neck flanges (WN): Used for butt welding between flanges and pipelines; they feature a reasonable structure, high strength, good rigidity, and reliable sealing performance.
Sealing face types include: flat face (FF), raised face (RF), male face (M), female face (FM), tongue and groove (T), grooved face (G), and ring face (RJ).
Socket weld flange (SW): This refers to a flange where the pipe end is inserted into the flange's ring groove and connected to the outside of the flange by welding. Socket weld flanges are divided into necked and non-necked types.
Sealing face types: Raised face (RF), male face (MFM), tongue and groove face (TG), and ring face (RJ).
Threaded flange (TH): This is a non-welded flange with its inner hole machined into a pipe thread, used for connection to threaded pipes. Threaded flanges are easy to install and maintain and can be used for pipelines where welding is not permitted on site.
Loose wing flange (LAPJ): Generally divided into butt weld loose wing flanges and flush weld loose wing flanges.
Blind flange cover (BL): Also known as a blind flange or blind plate. This is a flange without a center hole, used to seal pipe plugs.
Sealing Faces: Flat Face (FF), Raised Face (RF), Male Face (MFM), Tongue and Groove Face (TG), Ring Face (RJ)
II. Flange Standards: Standards include ASEM B16.5, ASME B16.47, GB/T 9112-GB/T9124, HG 20592-HG20605, HG20615-HG20626, and SH3406.
III. Flange Materials: Commonly used materials include carbon steel, stainless steel, and alloy steel. ASTM A105; A182 F5, F11, F12, F22, F91, F304/L, 316/L, F904L; A350LF2/LF3, A694 F52, F60, F65.
Cangzhou Aosendike Pipe Fittings Manufacturing Co., Ltd. is a large-scale manufacturer specializing in elbows, tees, reducers, and pipe caps. We can manufacture according to ASTM, ANSI, JIS, DIN, GB, and other standards, basically covering all types of steel.
For any purchasing needs or inquiries, please contact us.
Mobile: 86-13668807131
Website: https://www.authenticfitting.com/
Address: Mengcun Hui Autonomous County, Cangzhou City, Hebei Province
Email: authentic013@steelpipes-fitting.com
Latest News
Industry News
Sep. 20, 2026
Why are dimensions and wall thickness so important when purchasing carbon steel pipe fittings?
In piping engineering, although carbon steel pipe fittings are small in size, they directly impact the connectivity, pressure-bearing capacity, and operational stability of the piping system. When purchasing, buyers should not focus solely on price; dimensional accuracy and wall thickness control are equally critical indicators.
Industry News
Sep. 16, 2026
In industrial pipeline projects such as oil and gas, chemical, power, shipbuilding, and construction, carbon steel pipe fittings, although merely connecting components within the pipeline system, directly impact the system's installation, sealing, and long-term operation.
Industry News
Sep. 14, 2026
Working Principle of Carbon Steel Flanges
Cast flanges feature rough external shapes but precise dimensions, require minimal machining, and offer low costs; however, they are prone to casting defects (such as porosity) and cracks (often due to inclusions), and their internal structure is suboptimal (resulting in poor grain flow characteristics after cutting).
Authentic is here to help you find the right pipe fittings and flanges for your specific needs.
FAQ
What certifications do your products have?
Our products comply with international standards such as ASTM, ANSI, JIS, DIN, and GB. We also hold various certifications to assure quality and reliability, including ISO 9001.
How can I get some samples?
If you need, we will offer you samples for free, but new customers are expected to pay express charge.
To which country have you supplied your products?
We have supplied to Thailand, China Taiwan, Vietnam, India, South Africa, Sudan, Peru, USA, Brazil, Trinidad and Tobago, Kuwait, Qatar, Sri Lanka, Pakistan, Romania, France, Spain, Germany, Belgium, Ukraine etc. (Figures here only include our customers in latest 5 years.)
Get Quote
Have questions or need a custom solution? Reach out to us!
Our team at Authentic is here to help you find the right pipe fittings and flanges for your specific needs.
You Can Contact Us in the Following Ways
authentic013@steelpipes-fitting.com
+86 13668807131
Donghe Industrial Zone, Mengcun County, Cangzhou City, Hebei Province
Get Quote
At Authentic, we understand that every project has unique requirements. Our dedicated team is here to provide you with a customized quote tailored to your specific needs. By filling out the form below, you’ll receive competitive pricing, high-quality product details, and estimated delivery times.
中文
Русский
Español
عربي
