This part of this European Standard specifies technical delivery conditions for hot finished hollow sections of circular, square, rectangular or elliptical forms and applies to hollow sections formed hot, with or without subsequent heat treatment, or formed cold with subsequent heat treatment to obtain equivalent metallurgical conditions to those obtained in the hot formed product. Requirements for tolerances, dimensions and sectional properties are contained in EN 10210-2.
Chemical Requirement
Chemical composition — Cast analysis for product thickness ≤ 120 mm
The deoxidation methods are designated as follows:
FN = Rimming steel not permitted
FF = Fully killed steel containing nitrogen binding elements in amounts sufficient to bind available nitrogen
(e.g. min. 0,020 % total Al, or 0,015 % soluble Al).
b It is permissible to exceed the specified values provided that for each increase of 0,001 % N the P max. content is also reduced by 0,005 %. The N content of the cast analysis, however, shall not be more than 0,012 %.
c The maximum value for nitrogen does not apply if the chemical composition shows a minimum total Al content of 0,020 % with a minimum Al/N ratio of 2:1, or if sufficient other N-binding elements are present. The N-binding elements shall be recorded in the Inspection Document.
Table A.2 — Maximum carbon equivalent value (CEV) based on cast analysis
The maximum carbon equivalent value (CEV) for all grades, based on the cast analyses, given in Table A.2 shall apply. When determining the CEV the following formula shall be used.
Table A.3 — Mechanical properties of non-alloy steel hollow sections in thicknesses ≤ 40 mm
Mechanical properties of non-alloy structural steel hollow section
- a The impact properties are verified only when Option 1.3 is specified.
- b For thicknesses > 3 mm and section sizes D/T < 15 (round) and (B+H)/2T < 12,5 (square and rectangular) the minimum elongation is reduced by 2. For thicknesses
≤ 3 mm the minimum value for elongation is 17 %. - c For section sizes D/T < 15 (circular) and (B+H)/2T < 12,5 (square and rectangular) the minimum elongation is reduced by 2.
- d For thicknesses < 3 mm
- e For impact properties for reduced section test pieces see 6.7.2.
- f This value corresponds to 27J at –30 °C
BS EN 10210-1:2006
Hot finished structural hollow sections of non-alloy steels Tolerances
This part of EN 10210 specifies tolerances for hot finished circular, square, rectangular and elliptical structural hollow sections, manufactured
in wall thicknesses up to 120 mm, in the following size ranges:
- Circular: Outside diameters up to 2 500 mm
- Square: Outside dimensions up to 800 mm x 800 mm
- Rectangular: Outside dimensions up to 750 mm x 500 mm
- Elliptical: Outside dimensions up to 500 mm x 250 mm
Symbols and definitions
Tolerances on shape, straightness and mass
a For elliptical hollow sections of sizes H < 250 mm the permitted tolerance is twice the value given in this table.
b The positive deviation is limited by the tolerance on mass.
c For seamless sections thicknesses of less than 10 % but not less than 12,5 % of the nominal thickness may occur in smooth transition areas over not more than
25 % of the circumference.
d Where the diameter to thickness ratio exceeds 100, the tolerance on out-of-roundness shall be agreed.
e The tolerance on convexity and concavity is independent of the tolerance on outside dimensions.
f The sides need not be tangential to the corner arcs.
g The positive tolerance on the mass of seamless hollow sections is 8 %.
Tolerances on shape, straightness and mass
a The manufacturer shall establish at the time of enquiry and order the type of length required and the length range or length.
b Option 2.1 the tolerance on approximate length is 150
0 + mm.
c Common lengths available are 6 m and 12 m.