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Rolled Metal Handbook: Sections, Mass of 1 m, Metres per Tonne
Crane Rail Sections KR: Dimensions, Mass per Metre and Section Properties
The tables list crane rails KR70, KR80, KR100, KR120 and KR140 to GOST 4121-96: main dimensions, cross-sectional area, mass of 1 m, metres per tonne, moments of inertia and resistance. The GOST designations in this article are former standards: most of them have been withdrawn in Ukraine, so check the sizes against the project requirements.
Contents
What the designation KR70, KR100, KR140 means
Crane rails come in five types: KR70, KR80, KR100, KR120 and KR140. The number in the designation equals the head width in millimetres. The base of the rail is much wider than the head. Rails of this profile are intended for crane tracks.
Main dimensions
The table gives dimensions in millimetres: b is the head width, b2 the base width, s1 the web thickness, h the rail height, h1 the head height.
Crane rails KR: main dimensions · ГОСТ 4121-96 (former)
| Rail type | b, mm | b2, mm | s1, mm | h, mm | h1, mm |
|---|---|---|---|---|---|
| КР70 | 70 | 120 | 21 | 120 | 28 |
| КР80 | 80 | 130 | 26 | 130 | 35 |
| КР100 | 100 | 150 | 32 | 150 | 40 |
| КР120 | 120 | 170 | 38 | 170 | 45 |
| КР140 | 140 | 170 | 56 | 170 | 50 |
All dimensions in millimetres. The full set of dimensions and tolerances is in the text of the standard.
Mass of 1 m and section properties
The standard finds the mass of 1 m from the cross-sectional area with a steel density of 7850 kg/m³. Several values are needed to calculate a crane track in bending.
Crane rails KR: area, mass of 1 m and section properties · ГОСТ 4121-96 (former)
| Rail type | A, cm² | Mass of 1 m, kg | Metres per tonne | y1, cm | y2, cm | Jx, cm⁴ | Jy, cm⁴ | Wx1, cm³ | Wx2, cm³ | Wy, cm³ |
|---|---|---|---|---|---|---|---|---|---|---|
| КР70 | 58.72 | 46.1 | 21.7 | 5.77 | 6.23 | 1040.18 | 281.71 | 180.26 | 166.95 | 46.95 |
| КР80 | 76.19 | 59.81 | 16.7 | 6.42 | 6.58 | 1504.57 | 438.96 | 234.35 | 228.65 | 67.53 |
| КР100 | 105.85 | 83.09 | 12 | 7.55 | 7.45 | 2768.43 | 858.99 | 366.67 | 371.6 | 114.53 |
| КР120 | 144.54 | 113.47 | 8.81 | 8.65 | 8.35 | 4754.83 | 1596.08 | 549.69 | 569.43 | 187.76 |
| КР140 | 180.51 | 141.7 | 7.06 | 8.7 | 8.3 | 5486.19 | 2484.75 | 630.59 | 660.98 | 292.32 |
A is the cross-sectional area. y1 and y2 are the distances from the centroid to the extreme fibres along the height; their sum equals the rail height. Jx, Jy are the moments of inertia about the horizontal and vertical axes; Wx1 and Wx2 are the section moduli for the upper and lower fibre (Jx/y1 and Jx/y2), Wy is for the base (Jy divided by half the base width).
How to get the mass of a rail from the table
Mass is the mass of 1 m times the length. A KR70 rail has 46.10 kg per metre, so 10 m weigh 461 kg, and a tonne of such rail is about 21.7 m. A KR100 rail has 83.09 kg per metre, so a tonne is about 12 m.
The mass of a track section made of several rails is easy to add up from the “Mass of 1 m” column.
Calculator and ordering
For other sections the metal weight calculator is handy, and the tables of the rest of the range are collected in the rolled metal handbook. If you need crane-track structures to your drawings, send them with the request and we will price fabrication and galvanizing.
Updated:
Crane rails: frequently asked questions
How much does a KR70 crane rail weigh?
A KR70 rail weighs 46.10 kg per metre. Ten metres are 461 kg, and a tonne is about 21.7 m.
What does the number in KR100 mean?
The head width of the rail in millimetres. KR100 has a head 100 mm wide and a rail height of 150 mm.
Which types of crane rail does the standard include?
Five: KR70, KR80, KR100, KR120 and KR140, to GOST 4121-96.
How does a KR rail differ from a railway rail?
KR crane rails have their own standard, GOST 4121-96, and are intended for crane tracks. Railway rails are not covered in this handbook.
Related products: Custom steel fabrication · Steel structure design (structural and detail drawings)
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