Stainless transitions

International Equivalent

Mark Analogue W. Nr. Aisi Uns En Order
03Х18Н11 1.4306 304L X2CrNi19-11 Delivery from the stock, in stock
04Х18Н10 EI842 1.4307 304L X2CrNi18-9 Delivery from the stock, in stock
12X18H10T EP2 1.4541 321 X12CrNiTi18-10 Delivery from the stock, in stock

General characteristics

With the help of stainless steel transitions change the diameter of the pipeline from larger to smaller and vice versa. Concentric transitions are produced, they are also tapered - marked K), when both diameters of the transition are located on one axis of symmetry. Eccentric transitions are also produced. At such transitions the profile is a rectangular trapezium - one wall is straight, and the second is the change from one diameter to another.


Domestic stainless steel transitions are made seamless forged to welding. They are designed for pressure of 63-100 atm. According to TU. 26-18-38-90 dimensions are specified as follows, for example, 76x57 - 325x273. The length of transitions must correspond to GOST 17 378-2001 (for steel transitions. Domestic stainless steel transitions most often made of steel alloys 08X18H10T or 12X18H10T.

Chemical composition of 08Cr18Ni10T alloy

Fe Cr C Mn S P Ni Ti Si
Basic. 17 to 19 ≤0,08 ≤2 ≤0,02 ≤0,035 From 9 to 11 5-С-0,7 ≤0,8
Steel C Cr Fe Ni Ti Mn P S Si Impurities
12CR18NI10T ≤0,12 17-18 Osn. 9-10 ≤0,8 ≤2 ≤0,03 ≤0,02 ≤0,8 ≤0,15

Imported stainless steel reducers are made of electric-welded pipes, so they have a thinner wall at the same transition diameters, they have less weight and are not designed for such high pressure. They are produced in brightened 304 AISI, 304L AISI, rarely 316 AISI (316L AISI) grades.

The percentage composition of 304 L

AISI C Cr Fe Ni V Mn P S Si Impurities
304 L ≤0,03 18-20 Os. 8-12 --- ≤2 ≤0,045 ≤0,03 ≤1 ≤0,15

Buy at a bargain price

Company Evek GmbH offers its customers an unlimited choice of pipeline fittings and stainless steel transitions of the highest quality at a competitive price. If you have difficulty in choosing, at your service experienced managers who are always available and ready to provide advice. Ordering from us you get certified products that meet international quality standards in the shortest possible time. If you value your time, contact our nearest office today, or order online.