The stainless steel reducing flange should be treated as a size-transition component, not simply as a standard flange with a smaller hole. The larger side must match the mating flange geometry, pressure class, facing, and gasket, while the reduced side must suit the smaller pipe outside diameter, wall thickness, and joining method. The transition contour influences flow disturbance and available wall section, so its dimensions need to follow an approved standard or drawing. Stainless grades are selected for the process fluid and cleaning environment, with welding procedure and post-fabrication surface treatment considered at the same time.

Product Parameters

Item	Specification
Material Options	304; 304L; 316; 316L stainless steel
Configuration	Larger flange connection with reduced central bore
Connection	Bolted flange joint with pipe-side welding
Sealing	Gasket selected according to flange face and medium
Dimensional Basis	Applicable standard or confirmed project drawing
Bore Size	According to the smaller connecting pipe
Bolt Pattern	According to the mating flange
Surface	Machined sealing face; cleaned stainless steel surface
Customization	Grade, size combination, thickness, face, and hole pattern

Components

Large-side connection: matches the mating flange class and facing.

Transition bore: changes the flow passage to the smaller nominal size.

Pipe end: receives the specified butt-weld, socket, or other preparation.

Gasket face: provides the sealing surface for the bolted joint.

Bolt pattern: transfers assembly load to the mating connection.

Main Applications

The stainless steel reducing flange is suitable for corrosive water transfer and treatment skids.

Chemical dosing and process branches.

Sanitary or clean-service size changes.

Pump suction and discharge transitions.

Marine utility lines.

Compact equipment nozzle connections.

Selection and Installation

When ordering a stainless steel reducing flange, state the large flange size first and the smaller pipe size second. Add the rating, dimensional standard, stainless grade, schedule, face type, gasket basis, pipe-end preparation, quantity, and inspection scope. For welded service, confirm whether solution treatment, pickling, passivation, or weld documentation is required after fabrication.