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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
butt welding reducersButtwelding steel fittings4
Dimensional standard SIZES (OD x WT) Dimensional table
EN 10253-1 26.9 x 2.3 – 114.3 x 3.60 mm [20 – 100 DN] [3/4 – 4 NPS] Dimensional table
Withdrawn standards They may still be used occasionally
DIN 2616-2 26.9 x 2.3 – 114.3 x 3.60 mm [20 – 100 DN] [3/4 – 4 NPS] Dimensional table
ČSN 13 2200 26.9 x 2.3 – 114.3 x 3.60 mm [20 – 100 DN] [3/4 – 4 NPS] Dimensional table
ČSN 13 2385 26.9 x 2.3 – 114.3 x 3.60 mm [20 – 100 DN] [3/4 – 4 NPS] Dimensional table

Steel for butt welding reducers

Reducers are made from carbon and low alloy steels.

butt welding reducersButtwelding steel fittings7
Standard TDC Steel grade (open product)
EN 10256-1 S235
Withdrawn standards They may still be used occasionally
DIN 2609 (F,G) St 35.8
DIN 2609 (A) St 37.0
STN 13 2370 11 353
STN 13 2370 12 021
ČSN 13 2370 11 353
ČSN 13 2370 12 021

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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