EN 10378:2025

SLOVENSKI STANDARD
01-november-2025
Varjene kvadratne in pravokotne cevi iz nerjavnega jekla za mehansko, strojno in
dekorativno uporabo - Tehnični dobavni pogoji
Welded stainless steel square and rectangular tubes for mechanical, engineering and
decorative use - Technical delivery conditions
Geschweißte quadratische und rechteckige Rohre aus nichtrostendem Stahl für den
Maschinenbau und dekorative Anwendungen - Technische Lieferbedingungen
Tubes carrés et rectangulaires soudés en acier inoxydable pour usage mécanique,
technique et décoratif - Conditions techniques de livraison
Ta slovenski standard je istoveten z: EN 10378:2025
ICS:
23.040.10 Železne in jeklene cevi Iron and steel pipes
77.140.75 Jeklene cevi in cevni profili Steel pipes and tubes for
za posebne namene specific use
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 10378
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2025
EUROPÄISCHE NORM
ICS 23.040.10
English Version
Welded stainless steel square and rectangular tubes for
mechanical and structural engineering and decorative use
- Technical delivery conditions
Tubes carrés et rectangulaires soudés en acier Geschweißte quadratische und rechteckige Rohre aus
inoxydable pour usage mécanique, technique et nichtrostendem Stahl für den Maschinenbau, für das
décoratif - Conditions techniques de livraison Bauwesen und für dekorative Anwendungen -
Technische Lieferbedingungen
This European Standard was approved by CEN on 20 July 2025.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 10378:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Symbols . 6
5 Classification and designation . 7
5.1 Grades and qualities . 7
5.2 Designation . 7
6 Information to be supplied by the purchaser . 7
6.1 Mandatory information . 7
6.2 Options . 7
6.3 Example of an order . 8
7 Manufacturing process . 8
7.1 Steel making process . 8
7.2 Tube manufacturing process . 8
7.3 Delivery conditions . 8
8 Requirements . 10
8.1 General. 10
8.2 Chemical composition . 10
8.2.1 Cast analysis . 10
8.2.2 Product analysis . 13
8.3 Mechanical properties . 14
8.4 Appearance . 15
8.5 Dimensions. 15
8.5.1 Outside dimensions and wall thickness . 15
8.5.2 Lengths. 15
8.5.3 Mass . 15
8.6 Tolerances . 16
8.6.1 Tolerances on outside dimensions and wall thickness . 16
8.6.2 Tolerances on length . 16
8.6.3 Tolerances on shape . 17
8.6.4 Dimple tolerances . 17
8.7 End preparation . 17
8.8 Sectional properties . 17
9 Inspection and testing . 17
9.1 Types of inspection and testing . 17
9.2 Inspection documents . 18
9.2.1 Types of inspection documents . 18
9.2.2 Content of inspection documents. 18
9.3 Summary of inspection and testing . 19
10 Sampling . 19
10.1 Frequency of tests . 19
10.1.1 Test unit . 19
10.1.2 Number of sample tubes per each test unit. 20
10.2 Preparation of samples and test pieces . 20
10.2.1 General . 20
10.2.2 Test piece for the tensile test at room temperature . 20
10.2.3 Test piece for the flattening test . 20
10.2.4 Test piece for the product analysis . 20
11 Test methods . 21
11.1 Chemical analysis . 21
11.2 Tensile test at room temperature . 21
11.3 Destructive test of weld . 21
11.3.1 Flattening test . 21
11.3.2 Weld bending test . 22
11.4 Dimensional inspection . 23
11.4.1 General . 23
11.4.2 Measurement of size and shape . 23
11.5 Visual examination . 28
11.6 Material identification . 28
11.7 Tensile test at elevated temperature . 28
11.8 Retests, sorting and reprocessing . 28
12 Marking . 28
12.1 Marking to be applied . 28
12.2 Additional marking . 29
13 Handling and packaging . 29
Annex A (informative) Applicable roughness for polished square and rectangular tubes
according to the requested polished grit number (PGN) . 30
Annex B (informative) Formulae for the calculation of sectional properties . 31

European foreword
This document (EN 10378:2025) has been prepared by Technical Committee CEN/TC 459 “ECISS -
European Committee for Iron and Steel Standardization” , the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by March 2026, and conflicting national standards shall be
withdrawn at the latest by March 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Rep
...