Reducing Flange

QS Flange: Zhangzhou Reducing Flange

Reducing flange per ASME, ANSI, API, EN and BS, 1/2 to 56 inch, 150# to 2500#, FF/RF, in carbon, stainless, alloy and duplex steel for changing pipe diameter.

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One-Minute Overview

Flange that connects pipes of different diameters in a single fitting.
Sizes 1/2 to 56 inch, ratings 150# to 2500#, flat or raised face.
Carbon, stainless, alloy and duplex steel, including A105, A182 F304/F316 and F51 grades.
Used in chemical, oil and gas, power and water treatment piping.

A reducing flange joins two different pipe diameters in a single flanged fitting, so the line steps down without a separate reducer and an extra weld. The series spans 1/2 to 56 inch and 150# to 2500#, with FF or RF faces and bodies in carbon, stainless, alloy or duplex steel, produced to ASME, ANSI, API, EN and BS.

Name: Reducing Flange
Size: 1/2"-56"
Pressure: 150# - 2500#
Flange Face: FF, RF
Material: Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel
Standard: ASME, ANSI, API, EN, BS

The saving is real: one reducing flange replaces a reducer plus a matching flange, which means fewer welds and fewer leak paths on the line. Material choice follows the service. Carbon steel grades like ASTM A105 and A350 LF2 suit high-pressure pipelines and wellheads; stainless grades A182 F304, F316 and F321 resist corrosive chemicals and keep a clean surface in water treatment; alloy grades A182 F5, F9 and F11 handle the high temperature and pressure of steam and coolant circuits in power plants; duplex grades A182 F51, F53 and F55 combine strength with corrosion resistance for chemical, petrochemical and marine duties. Specify the two diameters and the pressure class, then match FF or RF to the mating gasket.

FAQ

Q1. How does a reducing flange change the line size?

It joins two different pipe diameters inside a single flanged fitting, so the size changes without a separate reducer and its extra weld. That cuts welds and leak paths. Sizes run 1/2 to 56 inch at 150# to 2500# with FF or RF faces, in carbon, stainless, alloy or duplex steel.

Q2. Why not just weld in a reducer like we always do?

You can, but a reducing flange removes that extra fitting from the list. One part changes the pipe size, so there are fewer welds and fewer places for a leak. In high-pressure oil and gas or power piping, every joint you delete is one less thing to inspect.

Q3. A105, F316, F51 — is this an alphabet or a shopping list?

A shopping list, helpfully sorted by job. A105 and A350 LF2 carbon steel cover pipelines and wellheads; A182 F304, F316 and F321 stainless take corrosive chemicals and clean water duty; F5, F9 and F11 alloys handle hot steam and coolant; F51, F53 and F55 duplex pair strength with corrosion resistance.

Q4. How long does production take?

Standard sizes are typically ready within 30 days, and in-stock items ship immediately. Larger or custom orders get a confirmed date per order, because the schedule depends on quantity, material, the bolt pattern you specify, and how busy production is at the moment you order.

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