BS/EN 13674-4-2019 pdf download.Railway applications – Track – Rail Part 4: Vignole railway rails from 27 kg/rn to, but excluding 46 kg/m.
7.4.2 Hot stamping
In addition to the branding requirements of 7.4.1 each rail shall be identified by a numerical and/or alphabetical code system, hot stamped on the non-branded side of the rail web by machine and each rail shall be hot stamped at least once every 10 m.
NOTE 1 A rail can display different Indications of position of the rail In the bloom (A. B…Y)along Its length.
NOTE 2 Subsequent cutting could result in more than one rail length having the same identity.
The figures and letters used shall be clearly legible and shall be 16 mm high. The stamped characters shall have a flat or radius face (1 mm to 1,5 mm wide) with bevels on each side. The letters and numbers shall be on a 100 angle from vertical and shall have rounded corners. The stamping shall be between 0,5 mm and 1,5 mm in depth along the centre of the web. The design shall be as shown in Figure 1.
The identilication system employed shall be such as to enable the hot stamped marking to be collated with:
a) number of the heat from which the rail has been rolled;
b) number of the strand and position of bloom within the strand.
In the event of identification marks having been removed, omitted or requiring alteration, reidentification of such marks shall be made by rotary burr.
7.4.3 Cold stamping
Cold stamping shall only be used on the cut lace of the rail within the central portion of the head, at the request of the purchaser.
7.4.4 Other identification
The steel grade may additionally be identified using paint. The purchaser shall specify the colour and position of the paint application.
8 Qualification of the manufacturer
The manufacturer shall qualify under EN 13674-1:2011+A1:2017, Clause 8 and shall then be qualified for all profiles in this part of EN 13674, provided the qualification was for the profile 60E1, 60E2 or the heaviest produced for the same grade.
NOTE The qualifying criteria specilled in EN 136741 could not be achieved using the rail grades specified In this part of EN 13674.
9.1 Laboratory tests
9.1.1 General
Laboratory tests shall be performed, during production, at frequencies as stipulated in Table 2. Results for each laboratory test shall comply with the limiting values shown in Tables 3 a) and 3 b). Additional information and other acceptance tests not covered by Tables 3 a) and 3 b) shall comply with the requirements of 9.1.2 to 9.1.6 inclusive. All rails supplied shall meet the requirements of Clause 9.
9.1.2 Chemical composition
9.1.2.1 General
The liquid chemical composition shall be determined for each heat. When the solid chemical composition is checked, this shall be carried out at the position of the tensile test piece. The chemical composition shall conform to the requirements of Tables 3 a) and 3 b).
9.1.2.2 Hydrogen
The hydrogen content of the liquid steel shall be measured by determining pressure of hydrogen in the steel using an online immersion probe system.
At least two liquid samples shall be taken from the first heat of any sequence using a new tundish and one from each of the remaining heats and analysed for hydrogen content (see Table 2). The first sample from the first heat in a sequence shall be taken from the tundish at the time of the maximum hydrogen concentration.
The heats shall be assessed for hydrogen content in accordance with Table 3. If the hydrogen contents of the first samples of a first heat or the heat sample of a second or further heat do not comply with the requirements of Table 3 then the blooms made before those samples are taken shall be slowly cooled or isothermally treated. This applies also to all blooms made before the hydrogen content eventually complies with the requirements in Table 3; in these cases, all heats shall be tested in the rail form, or the manufacturer shall calculate the hydrogen content with a documented model of hydrogen diffusion taking into account the time — temperature evolution of the blooms during the isothermal treatment process. In case of dispute, the hydrogen content shall be tested in the rail form.
When testing of rails is required rail samples shall be taken at the hot saw at a frequency of one per heat at random. However on the first heat in a sequence, the rail sample shall be from the last part of a first bloom teemed on any strand. Hydrogen determination shall be carried out on samples taken from the centre of the rail head.
If any test result after corrective treatment fails to meet the requirements stated in Table 3 the heat shall be rejected.BS/EN 13674-4-2019 pdf download.