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Steel reducers


Butt welding reducers are produced by pressing. The semi-finished product is rolled seamless tubes.

Reducers are mainly used as part of pipelines in the construction, energy engineering and mining industry.

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Steel reducers

Dimensions of welding reducers

OUTER DIAMETER (D)26,9 – 114,3 mm
(NPS 3/4 – 4)
WALL THICKNESS (T)2,3 – 3,6 mm
Dimensions of delivered reducers are shown in dimensional table.
Dimensions of welding reducers
Dimensional standard SIZES (OD x WT) Dimensional table
EN10253-126.9 x 2.3 – 114.3 x 3.60 mm [20 – 100 DN] [3/4 – 4 NPS]
ČSN13 220026.9 x 2.3 – 114.3 x 3.60 mm [20 – 100 DN] [3/4 – 4 NPS]
ČSN13 238526.9 x 2.3 – 114.3 x 3.60 mm [20 – 100 DN] [3/4 – 4 NPS]
DIN2616-226.9 x 2.3 – 114.3 x 3.60 mm [20 – 100 DN] [3/4 – 4 NPS]

Steel for butt welding reducers

Reducers are made from carbon and low alloy steels.

Standard TDC Steel grade (open product) Dimensional standard
ČSN13 237013 2200
DIN2609 (F,G)2616-2
ČSN13 237013 2385
STN13 237013 2200
DIN2609 (A)2616-2
STN13 237013 2385
EN10256-110253-1

Testing of welding reducers

The input tubes and ready made reducers are tested according to requirements and the appropriate standards.

Ends customization of the reducers

Upon agreement it is possible to supply reducers with a wall thickness of more than 3 mm with adjustment for a weld according to DIN 2559 standard

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Packaging of welding reducers

Reducers are packaged:
(a) in cardboard boxes or
(b) metal pallets.

redukciePackaking in cardboard boxes put on wooden pallets
Packaking in cardboard boxes put on wooden pallets
Packaking put on wooden pallets
Packaking put on wooden pallets
Packaking in metal pallets
Packaking in metal pallets
Packaking in carton box
Packaking in carton box

Marking of the welding reducers

Reducers are marked as required by standards or agreement.
Marking is done usually by stamping the agreed data.

Marked by stamping the data - reducers
Marked by stamping the data – reducers
Marked by stamping the data - reducers
Marked by stamping the data – reducers

Certificates for welding reducers

Certificates are issued according to either:

DIN 50 049 or
EN 10 204.


Dimensional tolerances of welding reducers

Dimensional tolerances are in accordance with relevant standards.

Heat treatment, condition of delivery and surface

The input tubes used for production of reducers are heat treated.

Reductions are delivered with the inner and outer surface descaled not preserved, without surface protection or with surface treated by blasting.



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+421 48 6451111 | admin@zelpo.sk

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