CIRCULAR HOLLOW SECTIONS


Round Steel Tubes


Circular hollow sections, also known as round steel tubes, are a common type of steel section that is used in a variety of formats over various industries in South Africa.

These steel sections are rolled from steel sheet or slit coil. The slit strip of steel coil goes through a forming and sizing section in a normal cold forming steel mill. The mill consists of a number of passes through which the sheet is gradually formed, each pass bending the steel sheet more and changing the radii on each pass. This is done until the two ends of the steel is pressed together and then welded inline.

Round steel sections can be rolled from a variety of materials. Most common is hot and cold rolled steel tubes. Hot rolled sections are predominantly used for structural purposes while tubes rolled from cold rolled steel has better bending ability and gives a better aesthetic appearance after being powder coated.

Steel sections can also be fin controlled and internally scarfed. A tube that is fin controlled means that the internal weld bead of the section has been controlled to an absolute minimum while a scarfed steel tube had the weld bead removed inline. This allows the tube to be suitable for mandrel bending.

Drawn steel sections and precision drawn steel tubes plays a large part in the steel industry. Steel sections can be drawn from a standard available sized tube to a smaller sized steel section. With precision drawn tubes the inner diameter of the steel tube can be controlled using a mandrel while the outer diameter is drawn down through a die.

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Circular Hollow Section Moment of Inertia Calculator:

D = mm
d = mm

Enter values above to calculate Moment of inertia

Circular hollow sections dimensions and properties
 Designation
 D*t
 m  A  I  Ze  Zpl  r  J
 mm  kg/m          10^3mm^2       10^6mm^4      10^3mm^3     10^3mm^3    mm             10^6mm^4
 60x3.0  4.24  0.537  0.219  7.29  9.76  20.2  0.438
 3.5  4.90  0.621  0.249  8.29  11.2  20.0  0.498
 4.0  5.55  0.704  0277  9.24  12.6  19.8  0.555
 4.5  6.19  0.785  0.304  10.1  13.9  19.7  0.609
 63.5x3.0  4.48  0.565  0.255  8.10  10.8  21.2  0.511
 3.5  5.18  0.654  0.291  9.22  12.4  21.1  0.582
 4.0  5.87  0.741  0.324  10.3  13.9  20.9  0.649
 4.5  6.55  0.827  0.356  11.3  15.4  20.7  0.713
 76.2x3.0  5.42  0.688  0.459  12.1  16.0  25.8  0.919
 3.5  6.26  0.797  0.525  13.8  18.4  25.7  1.05
 4.0  7.17  0.905  0.588  15.5  20.8  25.5  1.18
 4.5  7.96  1.01  0.648  17.1  23.0  25.3  1.30
 5.0  8.78  1.12  0.706  18.6  25.2  25.2  1.41
 6.0  10.4  1.32  0.814  21.4  29.5  24.8  1.63
 88.9x3.0  6.36  0.811  0.750  16.9  22.2  30.4 . 150
 3.5  7.37  0.940  0.861  19.3  25.6  30.3  1.72
 4.0  8.38  1.07  0.967  21.7  28.9  30.1  1.94
 4.5  9.37  1.19  1.07  24.0  32.2  29.9  2.14
 5.0  10.3  1.32  1.17  26.2  35.3  29.8  2.34
 6.0  12.3  1.56  1.35  30.4  41.4  29.4  2.71
 101.6x3.0  7.29  0.933  1.14  22.4  29.4  35.0  2.29
 3.5  8.47  1.08  1.32  25.8  34.0  34.8  2.63
 4.0  9.63  1.23  1.48  29.0  38.4  34.7  2.96
 4.5  10.8  1.38  1.64  32.2  42.8  34.5  3.29
 5.0  11.9  1.52  1.80  35.2  47.1  34.3  3.60
 6.0  14.1  1.81  2.09  41.0  55.4  34.0  4.19
 114.3x3.0  8.23  1.05  1.61  28.3  37.0  39.3  3.23
 3.5  9.56  1.22  1.86  32.6  42.8  39.1  3.71
 4.0  10.9  1.38  2.09  36.7  48.4  38.9  4.19
 4.5  12.2  1.55  2.32  40.8  54.0  38.7  4.65
 5.0  13.5  1.71  2.55  44.7  59.4  38.6  5.10
 6.0  16.0  2.04  2.98  52.2  70,1  38.2  5.96
 127x3.0  9.17  1.17  2.25  35.4  46.1  43.9  4.50
 3.5  10.7  1.36  2.59  40.8  53.4  43.7  5.18
 4.0  12.1  1.55  2.93  46.1  60.5  43.5  5.85
 4.5  13.6  1.73  3.25  51.2  67.6  43.3  6.51
 5.0  15.0  1.92  3.57  56.2  74.5  43.2  7.15
 6.0  17.9  2.28  4.18  65.9  87.9  42.8  8.38
 139,7x3.0  10.1  1.29  3.03  43.3  56.3  48.4  6.06
 3.5  11.8   1.50  3.50  50.0  65.2  48.3  7.00
 4.0  13.4  1.71  3.95  56.5  74.0  48.1  7.91
 4.5  15.0   1.92  4.40  62.9  82.7  47.9  8.81
 5.0  16.6  2.12  4.84  69.1  91.2  47.8  9.68
 6.0  19.8  2.53  5.68  81.2  108  47.4  11.4
 152.4x3.0  11.1  1.40  3.90  51.2  66.6  52.7  7.80
 3.5  12.9  1.63  4.50  59.3  77.2  52.5  9.01
 4.0  14.6  1.86  5.10  67.1  87.6  52.3  10.2
 4.5  16.4  2.09  5.68  74.7  97.9  52.2  11.4
 5.0  18.2  2.31  6.24  82.2  108  52.0  12.5
 6.0  21.7  2.75  7.35  96.6  128  51.7  14.7
 165.1x3.0  12.0  1.53  5.01  60.7  78.7  57.3  10.0
 3.5  13.9  1.78  5.79  70.2  91.3  57.1  11.6
 4.0  15.9  2.02  6.56  79.5  104  56.9  13.1
 4.5  17.8  2.27  7.31  88.6  116  56.8  14.6
 5.0  19.7  2.51  8.05  97.6  128  56.6  16.1
 6.0  23.5  3.00  9.48  115  152  56.3  19.0
 177.8x3.5  15.0  1.92  7.31  82.1  107  61.7  14.6
 4.0  17.1  2.19  8.28  93.0  121  61.5  16.6
 4.5  19.2  2.45  9.24  104  135  61.4  18.5
 5.0  21.3  2.72  10.2  114  150  61.2  20.4
 6.0  25.4  3.24  12.0  135  178  60.8  24.0
 193.7x3.5  16.4  2.09  9.51  98.0  127  67.4  19.0
 4.5  21.0  2.68  12.0  124  162  67.0  24.1
 6.0  27.8  3.54  15.7  162  212  66.5  31.4
 219.1x3.5  18.6  2.37  13.8  126  163  76.2  27.5
 4.5  23.8  3.03  17.4  159  207  75.9  34.9
 6.0  31.5  4.01  22.8  208  272  75.3  45.6
 8.0  41.6  5.30  29.6  270  356  74.7  59.1
 10.0  51.6  6.57  35.9  328  437  74.0  71.9
 273x4.5  29.8  3.80   34.2  251  324  94.9  68.4
 6.0  39.5  5.03  44.9  329  428  94.4  89.8
 8.0  52.3  6.66  58.5  429  562  93.7  117
 10.0  64.9  8.26  71.5  524  692   93.1  143
 12.0  77.2  9.84  84.0  615  818   92.4  168
 324x4.5  35.5  4.52  57.6  356  459  113  115
 6.0  47.1  5.99  75.8  468  607  112  152
 8.0  62.3  7.94  99.2  612  799  112  198
 10.0  77.4  9.86  122  751  986  111  243
 12.0  92.3  11.8  143  885  1170  110 287
 356x4.5  39.0  4.97  76.8  431  556  124 154
 6.0  51.8  6.60  101  568  735  124  202
 8.0  68.7  8.75  132  744  969  123  265
 10.0  85.3  10.9  163  915  1200  122  326
 12.0  102  13.0  192  1080  1420  122  384
 406x4.5  44.6  5.68  114  563  725  142  229
 6.0  59.2  7.54  151  743  960  141  302
 8.0  78.5  10.0  198  976  1270  141  396
 10.0  97.7  12.4  244  1200  1570  140  488
 12.0  117  14.9  288  1420  1860  139  577
 457x4.5  50.2  6.40  164  717  921  160  328
 6.0  66.7  8.50  216  946  1220  159  432
 8.0  88.6  11.3  284  1240  1610  159  569
 10.0  110  14.0  351  1540  2000  158  702
 12.0  132  16.8  416  1820  2380  157  831
 508x4.5  55.9  7.12  226  888  1140  178  451
 6.0  74.3  9.46  298  1170  1510  177  596
 8.0  98.6  12.6  393  1550  2000  177  786
 10.0  123  15.6  485  1910  2480  176  971
 12.0  147  18.7  575  2270  2950  175  1150