This 4" weld neck flange is designed for critical service applications where corrosion resistance is paramount. Manufactured to ASME B16.5 standards from ASTM A105N carbon steel, this flange offers robust mechanical properties and is further enhanced with an internal FBE (Fusion Bonded Epoxy) coating and an Inconel 625 weld overlay on the flange face. This combination provides exceptional protection against harsh chemical environments and high temperatures.

Key Specifications

Nominal Pipe Size	4 Inch
Schedule	S-40 (Estimated)
Flange Type	Weld Neck (WN)
ASME Standard	B16.5
Pressure Class	150
Facing Type	Raised Face (RF) (Assumed)
Material	ASTM A105N Carbon Steel
Coating (Internal)	Fusion Bonded Epoxy (FBE)
Flange Face Overlay	Inconel 625

Application & Use

This flange is ideal for use in chemical processing, oil and gas, and other industries where aggressive media are present. The Inconel 625 overlay provides excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. Common applications include connecting piping systems carrying corrosive fluids or gases, and in situations where high-integrity sealing is critical.

Condition & Availability

Please contact us for current availability and lead times. All flanges are inspected to ensure they meet stringent quality standards before shipment.