Structural Hollow Sections are manufactured by continuously forming a steel strip at room temperature. The strip passes through forming stands that gradually bend it into a circular shape. This circular shape then enters a welding station, where the edges are joined together with a continuous longitudinal weld seam. After welding, the external seam of the tube is removed, and the tube is passed through sizing stands to achieve its final shape-circular, square, or rectangular-and precise dimensions.
EN 10219-1 S235/S275/S355 Chemical Analysis
|
Steel grade |
Type of de-oxidation a |
% by mass, maximum |
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|
Steel name |
Steel number |
C |
C |
Si |
Mn |
P |
S |
Nb |
|
S235JRH |
1.0039 |
FF |
0,17 |
- |
1,40 |
0,040 |
0,040 |
0.009 |
|
S275J0H |
1.0149 |
FF |
0,20 |
- |
1,50 |
0,035 |
0,035 |
0,009 |
|
S275J2H |
1.0138 |
FF |
0,20 |
- |
1,50 |
0,030 |
0,030 |
- |
|
S355J0H |
1.0547 |
FF |
0,22 |
0,55 |
1,60 |
0,035 |
0,035 |
0,009 |
|
S355J2H |
1.0576 |
FF |
0,22 |
0,55 |
1,60 |
0,030 |
0,030 |
- |
|
S355K2H |
1.0512 |
FF |
0,22 |
0,55 |
1,60 |
0,030 |
0,030 |
- |
|
a. The deoxidation method is designated as follows: 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. 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. |
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