1 Sunny Steel Enterprise Ltd. Collect Steel pipe and fitting Resources EN 10305-1 . EN 10305-1 is the European Standard applications for specifies Steel tubes. The technical delivery conditions for seamless cold drawn Steel tubes of circular cross section for precision applications with specified outside diameter D <= 380 mm. NOTE This document may also be applied to other types of cross section and other suitable processes. Tubes according to this document are characterized by having precisely defined tolerances on dimensions and a specified maximum surface roughness. Seamless Precision Steel Tubes according to EN 10305-1 .
2 Typical fields of application are in the automotive, furniture and general engineering industries. Steel tubes for precision applications Technical delivery conditions Part 1: Seamless cold drawn tubes. EN10305-1 precision Steel tubes for precision applications the structure of electric vehicles, pneumatic and hydraulic operating mechanism. E-mail: Page:1 of EN Sunny Steel Enterprise Ltd. Collect Steel pipe and fitting Resources Standard and Steel grade: EN10305-1 E215/E235/E355. Feature: high precision and high brightness, the inner and outer surface of the tubes have high cleanness without oxid mechanical properties of the final tubes also come out excellent promising no leakage under high pressure no deformation after cold-bent and no cracks when flaring and flattening ensuring the efficient operation in all service.
3 DIN 2391-81 Part 2 Seamless Precision Steel tubes(DIN2391-81). Standard DIN 2391 defines the technical delivery conditions for seamless precision Steel tubes according to DIN 2391 Part 1 which are made from the Steel grades listed in section 5. Tubes according to this Standard are mainly used where accuracy to dimension and, possibly, small wall thicknesses and good surface condition are required. Table1, Chemical composition(%) (cast analysis)a Steel grade % by mass C Si Mn P Sb Al Name Number Max Max Max Max Max Min E215 E235 - E355c - Note: a Elements not included in this table(but see footnote c) shall not be intentionally added to the Steel without the agreement of the purchaser, except for elements which may be added for finishing the cast.
4 All appropriate measures shall be taknen to prevent the additon of undesirable elementts from scrap or other materials used inthe Steel making process. E-mail: Page:2 of EN Sunny Steel Enterprise Ltd. Collect Steel pipe and fitting Resources b For the Steel grades E235 and E355 a controlled sulphur content of to is specified to support machinability. It shall be obtained by result phursing the Steel after maximum desulphurisation or alternatively by using a low oxygen process. c Additions of Nb, Ti and V are permitted at the discretion of the manufacturer. The content of these elements shalll be reported.
5 Permissible deviations of the product analysis from the specified limits on cast analysis given Table1. Limiting value for cast analysis in Permissible deviation of the Element accordance with Table 1 in % by mass roduct analysisi in % by mass. C Si Mn P S Al Mechanical properties at room temperature Steel grade Minimum values for the delivery condition a,b +Cc +LCc +SR +Ad +N. Name Number Rm Rm Rm ReH Rm Rm ReH. A% A% A% A% A%. /MPa /MPa /MPa /MPa /MPa /MPa /MPa E215 430 8 380 12 380 280 16 280 30 290-430 215 30. E235 480 6 420 10 420 350 16 315 25 340-480 235 25. E355 640 4 580 7 580 450 10 450 22 490-630 355 22.
6 E-mail: Page:3 of EN Sunny Steel Enterprise Ltd. Collect Steel pipe and fitting Resources Note: a Rm ReH A . 1 . b 1 MPa=1N/mm2. c . +C ReH +LC ReH d ReH e 30mm 3mm ReH 10 MPa f 160mm ReH 420 MPa Diameter tolerances for heat treated tubes T/D-ratio Tolerance limits 1. T/D 2. Quality grade The tubes are supplied in the following quality grades : A) precision Steel tubes intended primarily for mechanical stressing, without any particular quality requirement and without acceptance test certificate. B) precision Steel tubes intended primarily for mechanical stressing, with special quirement and exclusively with acceptance test certificate.
7 C) precision Steel tubes with special requirement according to section 12. Theses requirements and corresponding tests must be agreed, with the customer having to specify his requirements at the time of enquiry and on ordering. E-mail: Page:4 of EN Sunny Steel Enterprise Ltd. Collect Steel pipe and fitting Resources Condition on delivery: Term Symbol Explanation Cold-finished/hard No heat treatment after the last cold-forming process. The tubes BK. (cold-finished as-drawn) therefore have only low deformability. After the last heat treatment there is a light finishing pass (cold Cold-finished/soft BKW drawing) With proper subsequent processing, the tube can be (lightly cold-worked).
8 Cold-formed ( bent, expanded) within certain limits. After the final cold-forming process the tubes are annealed in a Annealed GBK. controlled atmosphere or under vacuum. The tubes are annealed above the upper transformation point in a Normalized NBK. controlled atmosphere or under vacuum. Flattening test- constant factor of deformation C. After testing, the test piece shall be free from cracks or breaks. However, slight incipient cracks at its edges shall not be regarded as justification for rejection. Read more: E-mail: Page:5 of EN Sunny Steel Enterprise Ltd. Collect Steel pipe and fitting Resources Read more information of seamless Steel pipes Why seamless Steel pipe?
9 Some benefits of Seamless Steel Pipe Seamless Steel pipes for high temperature and pressure sevice GB5130-2008 Standard specification GB9948-2006, petroleum cracking tube seamless pipe Tubes for Mechanical and Automobile Seamless precision Steel tubes EN10216-2, Non-alloy and Steel tubes with specified elevated temperature properties. Get in Touch If you are interested in our products or cooperating with us, even having a comment or a suggestion please contact us now, for more detailed information. Tel.: +8621 3378 0199 | -------------- -------------- E-mail: Page:6 of EN