Hollow Section
Cold bent steel sections (Open and hollow)
Cold bent steel sections are produced from slit coils by continuous roller bending, using section-shaped pairs of rolls mounted into stands behind each other. Hollow sections are produced by welding the two edges of the strip bent to a round section to each other by high-frequency induction welding. The outer welding seam is planed-off and then the section is calibrated to the required shape and dimension. The cut-to-length process is performed by sawing-disc.
Steel Grades
The base material of cold bent steel sections is generally cold or hot rolled steel strip with the yield strength of at least 235 N/mm2.
| Mostly applied Steel Grades |
Relevant standards | |
| Number | Title | |
| S235JR | EN 10025-2 | Hot rolled products from structural steels Part 2: Technical terms of delivery of non-alloy structural steels |
| E235 | EN 10305-3 | Precision steel tubes. Technical terms of delivery Part 3: Welded, cold formed tubes |
| EN 10305-5 | Precision steel tubes. Technical terms of delivery Part 5: Welded, cold formed, square and rectangular tubes |
|
| S235JRH | EN 10219-1 | Cold formed, welded, hollow sections for the production of steel- structures from unalloyed and fine-grained steels Part 1: Technical terms of delivery |
1. Main Parameters
1.1. Steel Section Dimensions
|
Hollow sections |
Wall thickness; s (mm) |
Overall dimensions of sections (mm) |
Length; l (m) |
|
Round |
1.0–4.6 |
16–133 |
5–12 |
|
Square |
1.0–4.6 |
15×15–100×100 |
5–12 |
|
Rectangular |
1.0–4.6 |
20×10–150×60 |
5–12 |
|
Open sections |
Wall thickness; s (mm) |
Overall dimensions of sections (mm) |
Length; l (m) |
|
U |
1.5–6.0 |
20´20–250´80 |
5–12 |
|
L |
2–5.0 |
30´30–140´140 |
5–12 |
|
L |
2–4.0 |
40´20–180´100 |
5–12 |
|
C |
2–5.0 |
40´40–200´75 |
5–12 |
|
Z |
2–4.0 |
50´25–180´60 |
5–12 |
Dimensional limits of sections cut to precise lengths
|
Outside diameter of section (mm) |
With burring |
Without burring |
|
|
Outside diameter of round hollow steel section (mm) |
min. |
Ø 16 |
Ø 16 |
|
max. |
Ø 80 |
Ø 95 |
|
|
Outside diameter of square hollow steel section (b x b) (mm) |
min. |
□ 15 x 15 |
□ 15 x 15 |
|
max. |
□ 60 x 60 |
□ 80 x 80 |
|
|
Outside diameter of rectangular hollow steel section (h x b) (mm) |
min. |
▭ 20 x 10* |
▭ 20 x 10 |
|
max. |
▭ 50 x 30* |
▭ 90 x 70 |
|
|
Wall thickness |
According to the assortment |
||
* The base side cannot be longer than twice of the height.
| Outside dimension of section (mm) | With burring | 130-4 500 mm |
| Without burring | 30-4 500 mm |
1.2. Technical Requirements
|
Product group |
General technical |
Dimensions |
|
| Open steel sections | For general and steel structures | EN 10162 | Based on agreement |
| For Special Purpose | Based on agreement | ||
| Hollow steel sections | For general purpose | EN 10305-3, EN 10305-5 | |
| For steel structures | EN 10219-1 | EN 10219-2 | |
| For special purpose | Based on agreement | ||
2. Product Groups
2.1. Generally used open steel sections
Typical applications: Construction, automotive, mechanical engineering and other products (e.g. containers).
|
Main product groups |
Overall dimensions min. – max. (mm) |
||||
|
h |
b |
c |
s |
||
|
U Cold bent U-section |
img |
20–250 |
20–110 |
— |
1.5–6.0 |
|
L Cold bent equal sided L-section |
img |
30–140 |
30–140 |
— |
2.0–5.0 |
|
L Cold bent unequal sided L-section |
img |
40–180 |
20–100 |
— |
2.0–4.0 |
|
C Cold bent C-section |
img |
40–200 |
25–75 |
10–45 |
2.0–5.0 |
|
Z Cold bent Z-section |
img |
50–180 |
25–60 |
— |
2.0–4.0 |
2.2. Assortment of round hollow sections for general purpose and steel structures
Typical applications: Construction, automotive, mechanical engineering and other products (e.g. road poles and supporting structures).
| Outside diameter (mm) |
Unit weight (according to EN 10305-3 and EN 10219-2 standards) (kg/m) |
||||||||||
|
Thickness; s (mm) |
|||||||||||
|
1.0* |
1.25* |
1.5* |
1.8* |
2.0 |
2.5 |
3.0 |
3.2 |
3.6 |
4.0 |
4.6 |
|
|
16.0* |
0.370 |
0.455 |
0.536 |
0.630 |
|||||||
|
18.0* |
0.419 |
0.516 |
0.610 |
0.719 |
|||||||
|
19.0* |
0.444 |
0.547 |
0.647 |
0.764 |
|||||||
|
20.0* |
0.469 |
0.578 |
0.684 |
0.808 |
|||||||
|
21.3 |
0.501 |
0.618 |
0.732 |
0.866 |
0.952 |
||||||
|
22.0 |
0.518 |
0.640 |
0.758 |
0.897 |
|||||||
|
25.0 |
0.592 |
0.732 |
0.869 |
1.030 |
1.134 |
1.387 |
|||||
|
26.9 |
0.639 |
0.791 |
0.940 |
1.114 |
1.228 |
1.504 |
|||||
|
28.0 |
0.666 |
0.825 |
0.980 |
1.163 |
|||||||
|
32.0 |
0.764 |
0.948 |
1.128 |
1.341 |
1.480 |
1.819 |
|||||
|
33.5 |
0.801 |
0.994 |
1.184 |
1.407 |
1.554 |
1.911 |
2.256 |
||||
|
38.0 |
0.912 |
1.133 |
1.350 |
1.607 |
1.776 |
2.189 |
2.589 |
||||
|
39.8 |
0.957 |
1.188 |
1.417 |
1.687 |
|||||||
|
42.4 |
1.513 |
1.802 |
1.993 |
2.460 |
2.915 |
3.094 |
|||||
|
44.5 |
1.591 |
1.895 |
2.096 |
2.589 |
3.070 |
||||||
|
48.25 |
1.729 |
2.062 |
2.281 |
2.821 |
3.348 |
3.555 |
|||||
|
49.8 |
1.203 |
1.497 |
1.787 |
2.131 |
|||||||
|
51.0 |
1.831 |
2.184 |
2.417 |
2.990 |
3.551 |
3.772 |
4.208 |
4.636 |
|||
|
57.0 |
2.450 |
2.713 |
3.360 |
3.995 |
|||||||
|
60.0 |
2.164 |
2.583 |
2.861 |
3.545 |
4.217 |
4.482 |
5.007 |
5.524 |
|||
|
63.5 |
2.739 |
3.033 |
3.761 |
4.476 |
4.759 |
5.318 |
5.869 |
||||
|
70.0 |
3.354 |
4.162 |
4.957 |
5.272 |
5.895 |
6.511 |
|||||
|
76.1 |
3.655 |
4.538 |
5.408 |
5.753 |
6.437 |
7.112 |
8.111 |
||||
|
88.9 |
4.286 |
5.327 |
6.355 |
6.763 |
7.573 |
8.375 |
9.563 |
||||
|
95.0 |
5.703 |
6.806 |
7.244 |
8.114 |
8.977 |
10.255 |
|||||
|
101.6 |
6.110 |
7.295 |
7.765 |
8.700 |
9.628 |
11.004 |
|||||
|
108.0 |
6.504 |
7.768 |
8.270 |
9.269 |
10.259 |
11.730 |
|||||
|
114.3 |
6.893 |
8.234 |
8.767 |
9.828 |
10.881 |
12.445 |
|||||
|
127.0 |
9.174 |
9.770 |
10.955 |
12.133 |
13.885 |
||||||
|
133.0 |
9.618 |
10.243 |
11.488 |
12.725 |
14.566 |
||||||
* Not for round steel sections, limitations refer to the assortment of steel sections for steel structures (EN 10219): Round steel sections are made only of hot rolled base material with the thickness of minimum 2 mm; their outside diameter is minimum 21.3 mm.
2.3. Assortment of rectangular hollow steel sections for general purposes.
Typical applications: automotive, mechanical engineering and other products (fences, containers etc.).
| Overall Dimensions h x b (mm) |
Unit weight (according to EN 10305-5 standard) (kg/m) |
|||||||||
|
Thickness; s (mm) |
||||||||||
|
1.0 |
1.25 |
1.5 |
1.8 |
2.0 |
2.5 |
3.0 |
3.6 |
4.0 |
4.6 |
|
|
15 X 15, 20 x 10 |
0.438 |
0.537 |
0.632 |
0.741 |
||||||
|
20 x 15, 25 x 10 |
0.516 |
0.635 |
0.750 |
0.882 |
||||||
|
20 x 20 |
0.595 |
0.733 |
0.868 |
1.023 |
1.124 |
|||||
|
25 x 15, 30 x 10 |
0.595 |
0.733 |
0.868 |
1.023 |
||||||
|
30 x 15 |
0.673 |
0.831 |
0.985 |
1.165 |
||||||
|
25 x 25, 30 x 20 |
0.752 |
0.930 |
1.103 |
1.306 |
1.438 |
1.756 |
||||
|
40 x 10 |
0.752 |
0.930 |
1.103 |
1.306 |
||||||
|
30 x 30, 40 x 20 |
0.909 |
1.126 |
1.339 |
1.588 |
1.752 |
2.148 |
2.392 |
|||
|
35 x 25 |
0.909 |
1.126 |
1.339 |
1.588 |
||||||
|
35 x 35, 40 x 30, |
1.574 |
1.871 |
2.066 |
2.541 |
2.863 |
|||||
|
50 x 25 |
1.692 |
2.012 |
2.223 |
2.737 |
3.098 |
|||||
|
40 x 40, 50 x 30 |
1.810 |
2.154 |
2.380 |
2.933 |
3.334 |
3.896 |
4.252 |
|||
|
60 x 20 |
1.810 |
2.154 |
2.380 |
2.933 |
3.334 |
|||||
|
45 x 45, 50 x 40, |
2.436 |
2.694 |
3.326 |
3.805 |
||||||
|
50 x 50, 60 x 40, |
2.719 |
3.008 |
3.718 |
4.276 |
5.027 |
5.508 |
||||
|
60 x 50, 70 x 40, |
3.001 |
3.322 |
4.111 |
4.747 |
5.592 |
6.136 |
||||
|
60 x 60, 70 x 50 |
3.284 |
3.636 |
4.503 |
5.218 |
6.157 |
6.764 |
7.646 |
|||
|
80 x 40 |
3.284 |
3.636 |
4.503 |
5.218 |
6.157 |
6.764 |
||||
|
80 x 50 |
3.950 |
4.896 |
5.689 |
6.722 |
7.392 |
8.368 |
||||
|
90 x 40 |
3.950 |
4.896 |
5.689 |
6.722 |
7.392 |
|||||
|
70 x 70, 80 x 60, |
5.288 |
6.160 |
7.288 |
8.020 |
9.090 |
|||||
|
100 x 40 |
5.288 |
6.160 |
7.288 |
8.020 |
||||||
|
90 x 60, 100 x 50 |
5.681 |
6.631 |
7.853 |
8.648 |
9.812 |
|||||
|
80 x 80, 90 x 70, |
6.073 |
7.102 |
8.418 |
9.276 |
10.534 |
|||||
|
120 x 40 |
6.073 |
7.102 |
8.418 |
9.276 |
||||||
|
90 x 90, 100 x 80, |
6.858 |
8.044 |
9.548 |
10.532 |
11.979 |
|||||
|
100 x 100, 120 x 80 |
8.986 |
10.679 |
11.788 |
13.423 |
||||||
|
150 x 60, 140 x 70 |
9.457 |
11.243 |
12.416 |
14.145 |
||||||