BS/EN 10210-3-2020 pdf download.Hot finished steel structural hollow sections Part 3: Technical delivery conditions for high strength and weather resistant steels.
7.2.1 Under the inspection and testing conditions as specified in Clause 8 and in the delivery condition as specified in 6.5 the mechanical properties of the finished hollow section shall conform to the relevant requirements of Tables C.3, C.4, D.3, 0.4 and E.3.
Any heat treatment at more than 580 °C could lead to a reduction in the mechanical properties of TMCR sections and also hot finished sections not processed in the normalizing temperature range.
The following option can be specified by the purchaser at the time of enquiry and order:
Option 3.5 Longitudinal test pieces for the tensile test shall be taken from the centre of the corner, but remote from the weld in welded sections, (see Annex F).
7.2.2 Another temperature as given in the Tables C.4, D.4 and E.3 may be agreed at the time of the order.
If a Charpy test is performed at a lower temperature than specified in the standard and the impact energy values obtained meet the requirements at the higher temperature, then the material Is deemed to conform to the standard and the test need not be repeated at the higher temperature.
The following option can be specified by the purchaser at the time of enquiry and order:
Option 3.6 Longitudinal test pieces for the impact test shall be taken from the centre of the corner, but remote from the weld in welded sections. with the notch orientated through the material thickness.
7.2.3 Subject to limitations of 7.2.2:
a) the impact properties of structural hollow sections of steel qualities M, ML, Q, QL and QL1 shall be verified;
b) the impact properties of structural hollow sections of steel quality JO need not be verified unless option 3.7 is specified by the purchaser at the time of enquiry and order.
Option 3.7 For products In quality JO supplied with specific inspection and testing (see Option 3.12 and 3.13) the verification of the impact properties is specified.
7.2.4 The following requirement for fine grain steel hollow sections can be specified.
For fine grain steel hollow sections in thicknesses which do not permit impact test pieces of width  5 mm to be taken, the ferritic grain size (see 6.3) shall be verified by the method as described in
EN ISO 643.
When aluminium is used as the grain refining element, the grain size requirement shall be deemed to be fulfilled if the cast analysis shows the aluminium content to be  than 0,020 % total aluminium or alternatively  0,0 15 % soluble aluminium. In these cases, verification of the grain size is not required.
— a brittle structure In the heat affected zone;
— significant tensile stress concentrations in the welded joint.
NOTE 2 By using guidelines, specified for example in EN 1011-1, EN 1011-2 or any other relevant welding standard, the recommended welding conditions and the various welding ranges for the steel grades can be determined. These will vary depending on the product thickness, the applied welding energy, the design requirements, the electrode efficiency, the welding process and the weld metal properties.
7.3.2 Hot-dip-zinc coating
EN ISO 1461 should be used to specify coating requirements. EN ISO 147 13-2 provides further guidance, including information on the influence of various factors, including steel chemical composition, on the coating formation.
Option 3.8 can be used to order steels with a chemical composition required for hot-dip-zinc coating. When Option 3.8 is implemented, the purchaser and manufacturer shall agree a steel composition (cast analysis) of silicon and phosphorous according to either
— Category A (or steels satisfying the formula Si ≤ 0,03 % and Si + 2,5 P < 0,09 %); or
— Category 8 (limited to 0,14 % s Si s 0.25 %); or
— Category 0 (limited to 0,25 % < Si ≤ 0,35 %)
with required values as cited by the ranges given in EN ISO 14713-2:2009, Table 1, column 2.
Option 3.8 The chemical composition shall be suitable for hot dip zinc coating. If no additional information is given the delivered category is at the discretion of the manufacturer.
NOTE EN ISO 14713-2:2009, Table 1 gives guidance on typical coating characteristics on the basis of the surface composition of silicon and phosphorous associated with certain steel compositions.
The maximum carbon equivalent shall be increased by 0,02 or by 0,01 (see 7.1.2).
7.4 Product supply condition
7.4.1 The hollow sections shall have a smooth surface corresponding to the manufacturing method used; bumps, cavities or shallow longitudinal grooves resulting from the manufacturing process are permissible, provided the thickness is within tolerance, see EN 102 10-2.
Surface imperfections may be removed by the manufacturer by grinding,. provided that the thickness of the hollow section after the repair is not less than the minimum permissible thickness in accordance with EN 10210-2.BS/EN 10210-3-2020 pdf download.

Share on Facebook

Post on X

Follow us

Save