Stainless Steel Concentric Reducers

Name: Stainless Steel Concentric Reducers
Brand: HuaboPipe

304/316L stainless steel concentric reducers made to order. Specify the large and small end sizes, wall thickness at both ends and quantity for quotation.

Specifications

Size

DN15–DN1200 usual; larger per drawing, up to DN3000; both ends per order

Wall / SCH

Sch10s–XXS, matched to pipe

Standard

GB/T 12459, ASME B16.9, EN 10253, DIN, JIS; others per drawing

Bevel / ends

BW bevel per standard or drawing

Grade

304/304L, 316/316L, 310S, 321, 2205, 2507

Material specification

ASTM A403 WP304/WP304L, WP316/WP316L, WP321, WP310S; ASTM A815 WPS31803/S32205, WPS32750

Process

cold-formed → solution annealed → beveling and sizing → surface treatment (polishing, pickling, sand blasting and sand tumbling)

Inspection

MTR available on request; hydrotest/NDT and lead time per order

Marking

Hard stamping or ink marking, per standard or order

Certificates

ISO 9001/14001/45001, PED, DNV, BV, TÜV SÜD factory approvals; see this site’s Certificates page

Inquiry checklist

When inquiring, state: size, wall/SCH, grade, standard, qty; state both end sizes and wall thickness; non-standard parts can be made to drawing or sample.

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304 vs 316L: How to Choose?

How to choose

Use concentric reducers on vertical lines or where centerlines must stay aligned. Use eccentric reducers on horizontal lines, such as pump suction, to avoid air pockets or allow drainage. The piping design governs. Specify both end diameters, walls and transition length.

Buying Concentric Reducers for Stock Replenishment?

Send a line-by-line purchasing list for a mixed-size trial order. Standard items can be reviewed together; minimum quantities for special items and lead time are confirmed after checking the specifications, quantities and production schedule.

What to include in each line

Concentric geometry with a shared centerline
Large and small end DN/NPS or outside diameters
Wall thickness or schedule and end preparation at each end
Material specification, grade and seamless or welded construction requirement
Dimensional standard, overall length or drawing reference and quantity
Marking, material document type and any additional testing

Example inquiry line (for quotation only):
Concentric reducer | 316L | NPS 3 x NPS 2 | Sch40S at both ends | Seamless required | EN 10253 | 20 pcs

Add your required material specification and inspection documents. Include the destination and requested delivery date for the order.

Material Documents & Traceability

Material documentation with heat numbers, chemical composition and mechanical test results can be supplied with traceability to the corresponding products or batches. Specify the document type and marking requirements before ordering. Inspection and certificate coverage are confirmed for the ordered items.

Combining several fitting types? See our stainless steel butt-weld fittings supply overview, or send your complete list for a quote.

FAQ

Concentric or eccentric?

Maximum size?

DN3000. End sizes from the drawing.

Which standard?

GB/T 12459, ASME B16.9 (dimensions), EN 10253, DIN or JIS; other standards per drawing.

Non-standard?

Yes. Send both ends or a drawing.

Can I combine different reducer size pairs in a trial order?

Yes, standard size pairs can be reviewed together. List each large-end and small-end combination, both wall thicknesses and the quantity separately. Any minimum quantities and lead time are confirmed after the complete list is checked.

Are all published sizes available from stock?

These concentric reducers are supplied to order. Send your list; minimum quantity and lead time are confirmed with the quote.