Introduction to 304 Weld Neck Flanges

The 304 socket weld flange is categorized according to the 304 stainless steel material, also known as a socket weld flange or a weld neck flange. Some customers also refer to it as a flange disc. The names and terms vary by region, but they all represent the same product.

Features of 304 Weld Neck Flanges

The 304 Socket Weld Flange is a general-purpose stainless steel flange, widely used in the manufacturing of equipment and components that require excellent overall performance (***corrosion and formability).

To maintain the inherent corrosion resistance of stainless steel socket weld flanges, the steel must contain over 18% chromium and over 8% nickel content.

304 stainless steel is a grade of stainless steel produced in accordance with the American ASTM standards.

Specification Model

DN15-DN4000

Pressure Rating

PN2.5~PN400

Sealing face type

Bolted Flange with Neck, Raised Face (RF)

Full Face Flanged Welding Flange with Neck (FF)

Oval Flange with Neck, Welding Type (MFM)

Flanged Socket Welding Flange (FM)

Oval Neck Welding Flange (M)

Sleeve Type Flanged Socket Welding Fitting (TG)

The concave-convex flanged weld neck (MFM) is for matching use.

304 Socket Weld Flange Material

Common marking methods in the market include 06Cr19Ni10, SUS304, where 06Cr19Ni10 generally indicates GB standard production, 304 usually signifies ASTM standard production, and SUS 304 denotes JIS standard production.

Standard of Operation

Mechanical Department Standards, Chemical Industry Standards, Electrical Standards, National Standards, American Standards, German Standards, Japanese Standards, etc.

Connection Type

The neck is welded to the pipe, a gasket is inserted, and the bolts are tightened.

Production Process

Pure forging, suitable for necked flat welding flanges (SO) and necked butt welding flanges (WN); steel plates are suitable for flat welding flanges.

Procurement Recommendations

1: Recommend purchasing from a reputable socket weld flange manufacturer with a certain scale of production.

2: Manufacturers of flanges are required to provide material inspection reports and related documents for necked butt-welding flanges.

3:颈对焊法兰 must have corresponding specification and model steel stamping and identification.