Introduction to 304 Weld Neck Flange

The 304 Socket Weld Flange is categorized according to the 304 stainless steel material, abbreviated as 304 Socket Weld Flange, also known as SO flange.

304 Socket Weld Flanges and 316 Socket Weld Flanges are common materials in stainless steel flanges, widely used in various applications. They have a density of 7.93 g/cm³ and are also known as 18/8 stainless steel in the industry. ***At high temperatures of 800 degrees, they feature excellent machinability and high toughness, making them extensively used in industrial, furniture decoration, and food industries.

Features of 304 Weld Neck Flange

1: Excellent corrosion and thermal resistance, low-temperature strength, and mechanical properties; good for hot forming and bending, without hardening after heat treatment (operating temperature -196℃ to 800℃).

2: Subject to atmospheric corrosion; in industrial atmospheres or heavily polluted areas, timely cleaning is required to prevent corrosion.

3: Suitable for food processing, storage, and transportation. Features good processing properties and weldability.

Specification Model

DN15-DN2000

Pressure Rating

PN6~PN40;

Sealing Surface Type

Rounded Face (RF), Flat Face (FF), Milled Face (MFM), Concave Face (FM), Mounded Face (M), Tongue and Groove (TG)

The concave-convex surface (MFM) is for matching use.

304 Socket Weld Flange Material

Common marking methods in the market include 06Cr19Ni10, SUS304, where 06Cr19Ni10 generally indicates production in accordance with the Chinese national standard, 304 usually indicates production in accordance with the ASTM standard, and SUS 304 indicates production in accordance with the Japanese standard.

Execution Standards

Chemical Industry Standard: HG/T 20592-20635-2009

National Standard: GB/T 9116-2010

US Standards: ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48

German Standard: DIN 2630-2637, DIN - EN 1092-1

Connection Type

Like flanged sockets, single-sided welding, double-sided bolted.

Production Process

Pure material forging, suitable for necked lap and necked butt flanges; steel plate suitable for lap joint flanges.

Procurement Recommendations

1: Recommend purchasing from a reputable necked flat welding flange manufacturer with a certain production scale.

2: manufacturers of flanges are required to provide material test reports and other relevant documents for necked butt-welding flanges.

3: Necked flat welding flanges must have corresponding specification model stamping and identification.