Hot rolling I-beam basic knowledge summary

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1 I-beam section drawing and labeling

2 specifications, models

2.1 Specification method

The specification of the I-beam can be expressed by the main profile size (mm) of the section, that is, the number of millimeters of the waist height (h) * leg width (b) * waist thickness (d), such as 1160 * 88 * 6. I-beam specifications can also be expressed in models (numbers), which indicate the number of centimeters in waist height. If the waist height is the same as the I-beam, if there are several kinds of low leg width and waist thickness, it needs to be marked with the code (also called the corner code) a or b or c on the right side of the model.

2.2 The meaning of the code

According to the order of the codes a, b, and c, the leg width and waist thickness of the same type of I-beam increase sequentially. and so:

A—Indicating that the same type of I-beam has the thinnest waist, the widest leg, and the lightest theoretical weight per meter;

B—indicate that the waist thickness and leg width are moderate in the same model of I-beam, and the theoretical weight per meter is moderate;

C—Indicating that the same type of I-beam has the thickest waist and the widest leg, and the theoretical weight per meter is the heaviest.

2.3 model example (omitted)

2.4 Description of the model

2.4.1 I-beam can be marked with “I” in front of the model, and the symbol “#” can be added to the upper right corner of the model, such as 132c#.

2.4.2 I-beam is divided into ordinary type and light type. Compared with the same type of ordinary I-beam, the light-weight I-beam has smaller waist thickness and lighter weight. The leg width varies with the size of the model: the model size is small (I32# or less), the leg width is smaller than the ordinary I-beam; the model size is larger (I40# or more), and the leg width is larger than the ordinary I-beam.

3 size, weight

3.1 Hot-rolled I-beam specification range 10#～63#.

3.2 The size, cross-sectional area and theoretical weight of I-beam should meet the specifications of the following table.

model Size, mm Cross-sectional area, cm2 Theoretical weight, kg/m
h b d t r R1
10 100 68 4.5 7.6 6.5 3.3 14.345 11.261
12.6 126 74 5.0 8.4 7.0 3.5 18.118 14.232
14 140 80 5.5 9.1 7.5 3.8 21.216 16.890
16 160 88 6.0 9.9 8.0 4.0 26.131 20.513
18 180 94 6.5 10.7 8.5 4.3 30.756 24.143
20a 200 100 7.0 11.4 9.0 4.5 35.578 27.929
20b 200 102 9.0 11.4 9.0 4.5 39.578 31.069
22a 220 110 7.5 12.3 9.5 4.8 42.128 33.070
22b 220 112 9.5 12.3 9.5 4.8 46.528 36.524
25a 250 116 8.0 13.0 10.0 5.0 48.541 38.105
25b 250 118 10.0 13.0 10.0 5.0 53.541 42.030
28a 280 122 8.5 13.7 10.5 5.3 55.404 43.492
28b 280 125 10.5 13.7 10.5 5.3 64.004 47.888
32a 320 130 9.5 13.7 11.2 5.8 67.156 52.717
32b 320 132 11.5 15.0 11.2 5.8 73.556 57.741
32c 320 134 13.5 15.0 11.2 5.8 79.956 62.765
36a 360 136 10.0 15.8 12.0 6.0 76.480 60.037
36b 360 138 12.0 15.8 12.0 6.0 83.680 65.689
36c 360 140 14.0 15.8 12.0 6.0 90.880 71.341
40a 400 142 10.5 16.5 12.5 6.3 86.112 67.598
40b 400 144 12.5 16.5 12.5 6.3 94.112 73.878
40c 400 146 14.5 16.5 12.5 6.3 102.112 80.158
45a 450 150 11.5 18.0 13.5 6.8 102.446 80.420
45b 450 152 13.5 18.0 13.5 6.8 111.446 87.485
45c 450 154 15.5 18.0 13.5 6.8 120.446 84.550
50a 500 158 12.0 20.0 14.0 7.0 119.304 83.654
50b 500 160 14.0 20.0 14.0 7.0 129.304 101.504
50c 500 162 16.0 20.0 14.0 7.0 139.304 109.354
56a 560 166 12.5 21.0 14.5 7.3 135.435 106.316
56b 560 168 14.5 21.0 14.5 7.3 146.635 115.108
56c 560 170 16.5 21.0 14.5 7.3 157.835 123.900
63a 630 176 13.0 22.0 15.0 7.5 154.658 121.407
63b 630 178 15.0 22.0 15.0 7.5 167.258 131.298
63c 630 180 17.0 22.0 15.0 7.5 179.858 141.189

3.4 length

3.4.1 usual length

The normal length of the I-beam should meet the requirements of the following table.

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