Plate flanges

INTRO

Because the flat welded flange has good comprehensive performance, it is widely used in chemical industry, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, health, water heating, fire, power, aerospace, shipbuilding and other basic projects.

Global Compliance & Standard：
GB/T9119-2010 HG/T20592-2009 HG/T20615-2009 DIN ASME BS JIS
Material：
304：F304 S30408 S30408II S30408III S30400
304L：S30403 S30403II 30403 30403II
316L：31603 31603II 31603III
2507（F53） 2205（F51） TP310S（06Cr5Ni20） TP321（06Cr18Ni11） S22053III=2205III T321-32168=321

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DESCRIPTION DOWNLOAD

Plate flange is the most common flange, the pressure is PN2.5, PN6, PN10, PN16, PN25.
Welding form: flat welding flange is to insert the pipe into the flange to weld.please see the download section on the right.

Manufacturer Intro

Longan Flange is a stainless steel plate flange manufacturer serving DIN, GOST, and GB/T standard markets worldwide. Our plate flanges (also known as flat flanges) cover DN15 to DN600 in pressure ratings from PN2.5 to PN25 per GB/T9119, DIN 2576, and GOST 12820. Available in SS304, 304L, 316L, duplex 2205, and super duplex 2507. Plate flanges are ideal for low-pressure applications and are widely used in water treatment, food processing, and chemical industries. Complete plate flange dimensions are listed by PN class below. Forged in-house. Quote within 24 hours.

Why Choose Our Plate Flange?

Versatility: suitable for industries and applications (Chemical, Construction, Water Supply, Shipbuilding)
Compliance: adheres to multiple international standards (GB/T9119-2010, HG/T20592-2009, HG/T20615-2009, DIN, ASME, BS, and JIS)
Durability: made from premium materials that resist corrosion and wear (304, 304L, 316L, 2507, 2205, TP310S, TP321)
Affordability: competitive, discounted price for bulk order
Pressure-Rated: Available in PN2.5, PN6, PN10, PN16, PN25

Quality Control for Reliable Low-Pressure Sealing

Material Testing

Spectral detection for composition

Forging & Rolling

Precision cutting and shaping

CNC Machining

Bolt hole placement accuracy

Final Inspection

Dimensional and flatness check

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MOQ from 1 Piece

Standard PN ratings and sizes available from a single piece.

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Quote Within 24 Hours

Technical quotations delivered within 24 hours of your inquiry.

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ISO 9001 / ISO 14001 / ISO 45001 / CE / PED

Manufactured in a certified facility. MTC per EN 10204 3.1 supplied with every order.

Frequently Asked Questions (FAQs）

What is a plate flange used for?

Plate flanges are commonly used to connect pipes, valves, and other equipment in low-pressure applications. They provide a flat, strong connection that can be easily assembled and disassembled, making them ideal for industries like water treatment, oil and gas, and HVAC systems.

What materials are your plate flanges made from?

Our plate flanges are typically made from (Duplex) stainless steel including 304, 304L, 316L, 2507, 2205, TP310S, TP321

How are plate flanges installed?

Plate flanges are installed by welding them to the end of a pipe, then bolting them to another flange or piece of equipment. The flat surface of the flange ensures a tight seal, and gaskets are often used to enhance the seal between flanges.

What standards do your plate flanges comply with?

Our stainless steel plate flanges comply with GB/T9119, DIN 2576, and GOST 12820 standards. Plate flanges are the most common flange type in DIN and GOST markets for low-pressure applications.

What pressure ratings are available?

Our plate flanges cover PN2.5 through PN25 as standard.

What is the lead time and MOQ?

MOQ starts from 1 piece for standard sizes. Lead time depends on size, quantity, and material — we confirm the exact delivery schedule in your quotation. Factory-direct quotes are provided within 24 hours.