Docol® Tube R8
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Docol® Tube R8 is a product range of welded cold formed circular tubes in high strength steel, specifically targeted at the requirements of the Motor Sport industry and similar producers. It is intended for applications requiring a combination of extremely high performance and lean design. Docol Tube R8 is produced using tube designated SSAB high strength steel, with high yield strength in combination with excellent bending and welding properties. Docol Tube R8 tubes are produced with narrow tolerances, including inside weld bead height. Delivery condition of Docol Tube R8 is according to EN 10305-3 and R8 tubes are always accompanied by inspection certificate 3.1. Docol Tube R8 is approved as an allowable material in the SFI specifications for roll cages in different types of drag racing vehicles.
Docol Tube R8 is available in circular shape.
| Shapes | Dimensions |
|---|---|
| Circular (in) | 1 - 21) |
| Wall thickness (in) | 0.049 - 0.095 2) |
| Mill length (ft) | 19 3) |
Other shapes, sizes and lengths are available upon request.
1) (25.4 - 50.8 mm)
2) (1.24 - 2.41 mm)
3) (5791 mm)
| Diameter | 0.049" (1.24mm) [lb/ft] | 0.065" (1.64mm) [lb/ft] | 0.083" (2.11mm) [lb/ft] | 0.095" (2.41mm) [lb/ft] |
|---|---|---|---|---|
| 1" (25.4 mm) | 0.497 | 0.649 | — | — |
| 1.250" (31.8 mm) | 0.628 | 0.822 | 1.034 | 1.172 |
| 1.500" (38.1 mm) | 0.759 | 0.996 | 1.256 | 1.426 |
| 1.750" (44.5 mm) | — | 1.170 | 1.478 | 1.679 |
| 2.000" (50.8 mm) | — | 1.343 | 1.699 | 1.933 |
| Yield strength Rp0.2 1) (min ksi) |
Tensile strength Rm 2) (min ksi) |
Elongation A 3) (min %) |
|
|---|---|---|---|
| R8 | 100 | 116 | 8 |
1) Yield strength 100 ksi = 690 MPa
2) Tensile strength 116 ksi = 800 MPa
3) Typical elongation value 10-12% (A50)
| C (max %) |
Si (max %) |
Mn (max %) |
P (max %) |
S (max %) |
Altot (min %) |
Cr (max %) |
Cr+Mo (max %) |
|
|---|---|---|---|---|---|---|---|---|
| R8 | 0.15 | 0.30 | 1.70 | 0.020 | 0.010 | 0.015 | 0.105 | 0.155 |
| Characteristic | Circular precision tubesTolerances meet or exceed the requirements of EN 10305-3 |
|---|---|
| Outside diameter (D) (11.000"≤ D < 1.125" (25.4 mm ≤ D < 31.8 mm)1.125"≤ D ≤ 1.500" (31.8 mm ≤ D ≤ 38.1 mm)1.500" < D ≤ 2.000" (38.1 mm < D ≤ 50.8 mm) | ±0.0059" (±0.15 mm)±0.0079" (±0.20 mm)±0.0098" (±0.25 mm) |
| Out-of-roundness | The diameter tolerances include the out-of-roundness |
| Thickness (T) | T ≤ 0.083" (2.11 mm): ±0.0059" (±0.15 mm) T > 0.083" (2.11 mm): ±10% |
| Straightness | Maximum 0.10% of measured length |
| Height of internal weld bead (g) | D > 1.000" (25.4 mm): g ≤ 0.012" (0.3 mm) D = 1.000" (25.4 mm): g ≤ 0.040" (1.0 mm) |
| Mill length | 0/+0.1641 ft (0/+50 mm) |
1)For a maximum distance of 0.3281 ft (100 mm), the ends may, due to residual stresses, have diameters outside the tolerance
| Designation | Definition | Usability |
|---|---|---|
| UC | Uncoated (cold rolled), T ≤ 0.083” (2.11 mm) |
Suitable surface condition if painted or chromium plated |
| UC |
Uncoated (hot rolled), T > 0.083” (2.11 mm) |
Suitable surface condition if painted |
Suitable surface condition if painted or chromium plated
Uncoated (hot rolled), T > 0.083” (2.11 mm)
Suitable surface condition if painted
Surface is slightly oiled to protect it from corrosion during transportation and short-term storage. By request, tubes can be delivered dry, however in that case SSAB will not be responsible for any possible rust.
| Designation | Ra value |
|---|---|
| UC, cold rolled |
< 0.6 µm |
| UC, hot rolled |
< 2.0 µm |
< 0.6 µm
< 2.0 µm
The tubes are not intended to undergo any heat treatment after welding and sizing as that may alter the mechanical properties of the material.
The tubes are oiled with anti-corrosive oil.
For information concerning fabrication, see SSAB´s brochures on www.ssab.com or consult Tech Support.
Appropriate health and safety precautions must be taken when bending, welding, cutting, grinding or otherwise working on the products.