DN15-DN600 stainless Steel Weld Neck Flange

DN15-DN600 stainless steel weld neck flange is a premium, high-integrity pipe connector designed to be butt-welded directly to a pipe or fitting. Its defining feature is a long, tapered hub that distributes stress evenly and resists distortion, making it the industry standard for high-pressure, high-temperature, and hazardous systems.

Specification:

1. DN15-DN600

2. Pressure Classes: Commonly rated from Class 150 to Class 2500

3. ·Available in Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ) depending on the required gasket seal.

4. Materials: carbon steel (e.g., ASTM A105), stainless steel (304/316), and other alloy steels.

5. For example: SS316（UNS S31600 / 1.4401 / SUS316）,chemical composition: (wt%)，ASTM/EN standard:

C：≤ 0.08

Si：≤ 1.00

 Mn：≤ 2.00

P：≤ 0.045

S：≤ 0.030

Cr：16.0–18.0

Ni：10.0–14.0

Mo：2.0–3.0

Features:

· High Joint Integrity: The butt-welded connection prevents leakage and ensures maximum structural strength.

· Reduced Turbulence: The flange's bore matches the pipe's inside diameter perfectly, creating a smooth, uninterrupted flow path that prevents erosion and pressure drops.

· Stress Distribution: The long, tapered hub allows for proper alignment and naturally spreads the load and thermal expansion forces, preventing "bowing" or "dishing"

Application:

Because of their high strength and smooth internal transition, weld neck Flanges are almost exclusively used in demanding environments like:

· Oil, gas, and petrochemical pipelines

· Power generation and steam systems

· High-vibration or heavy-load industrial piping

· Systems that process highly corrosive, toxic, or volatile materials

Compared to alternatives like slip-on or lap joint flanges, weld neck flanges are more expensive and require highly skilled welders for proper alignment and full-penetration welding. However, their unmatched reliability makes them well worth the initial investment.