Introduction to Steel Flat Welding Flange

Steel flat welding flanges can be categorized by material, such as carbon steel, alloy steel, and stainless steel. They are commonly referred to as flat welding flanges, simply as flat flanges, or as flanges and flange blanks, with different names in various regions.

Features of steel flat welding flange

Due to its space-saving and weight-reducing design, it is crucial to ensure that the joint area does not leak and maintains excellent sealing properties. As such, it is a superior flange product that reduces both weight and space, playing a significant role in industrial applications.

Spec Model

DN15-DN2000

Pressure Rating

PN2.5~PN100

Sealing Surface Type

Standard sealing surface types include: Raised Face (RF), Flat Face (FF).

We can also customize different types of sealing faces and sizes to meet customer requirements.

Steel flat welding flange common material

Carbon Steel Flanges: 20#, Q235B, 16Mn

Alloy Flanges: Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2Mo1

Stainless Steel Flanges: 304, 304L, 316, 316L, 321

Execution Standard

Chemical Industry Standard: HG/T20592-2009

National Standards: GB/T9119-2010, GB/T2555-81

Mechanical Department Standards: JB/T81-94, JB/T74-94, JB/T75-94

We offer a range of flange series standards, including Japanese, German, and others.***

Connection Type

Insert the steel pipe into the inner diameter of the flange and perform a single-sided welding, followed by tightening both sides with bolts.

Steel Welding Flange Manufacturing Process

Oxygen furnace blanking, full forging or finished forging, cutting and shaping, high-precision CNC lathe turning, CNC boring mill drilling.

Application Fields

Due to the excellent comprehensive properties of steel flat weld flanges, they are widely used in fundamental projects such as chemical industry, construction, water supply and drainage, oil, heavy and light industry, refrigeration, sanitation, plumbing, fire protection, power, aerospace, and shipbuilding.

Procurement Recommendations

1: Suggest purchasing from a reputable flange manufacturer with a certain production scale.

2: Manufacturers of flanges need to provide material inspection reports and related documents for steel flat welding flanges.

3: Steel flat weld flanges must have corresponding specification and model stampings and markings.