Docol® Tube R8

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General Product Description

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.

Dimension Range

Docol Tube R8 is available in circular shape.

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    Shapes Dimensions
    Circular (in) 1 - 21)
    Wall thickness (in) 0.049 - 0.095 2)
    Mill length (ft) 19 3)
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      Shapes
      Circular (in)
      Dimensions
      1 - 21)
      Shapes
      Wall thickness (in)
      Dimensions
      0.049 - 0.095 2)
      Shapes
      Mill length (ft)
      Dimensions
      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)

      Circular Dimensions

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        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
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          Mechanical Properties

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            Yield strength Rp0.2 1)
            (min ksi)
            Tensile strength Rm 2)
            (min ksi)
            Elongation A 3)
            (min %)
            Docol Tube R8 100 116 8
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              1) Yield strength 100 ksi = 690 MPa

              2) Tensile strength 116 ksi = 800 MPa

              3) Typical elongation value 10-12% (A50)

              Chemical Composition (ladle analysis)

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                C
                (max %)
                Si
                (max %)
                Mn
                (max %)
                P
                (max %)
                S
                (max %)
                Altot
                (min %)
                Cr
                (max %)
                Cr+Mo
                (max %)
                Docol Tube R8 0.15 0.30 1.70 0.020 0.010 0.015 0.105 0.155
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                  Tolerances

                  Tolerance Circular

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                    Characteristic Circular precision tubes
                    Tolerances meet or exceed the requirements of EN 10305-3
                    Outside diameter (D) (1
                    1.000"≤ 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)
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                      Characteristic
                      Outside diameter (D) (1
                      1.000"≤ 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)
                      Circular precision tubes
                      Tolerances meet or exceed the requirements of EN 10305-3

                      ±0.0059" (±0.15 mm)
                      ±0.0079" (±0.20 mm)
                      ±0.0098" (±0.25 mm)
                      Characteristic
                      Out-of-roundness
                      Circular precision tubes
                      Tolerances meet or exceed the requirements of EN 10305-3
                      The diameter tolerances include the out-of-roundness
                      Characteristic
                      Thickness (T)
                      Circular precision tubes
                      Tolerances meet or exceed the requirements of EN 10305-3
                      T ≤ 0.083" (2.11 mm): ±0.0059" (±0.15 mm)
                      T > 0.083" (2.11 mm): ±10%
                      Characteristic
                      Straightness
                      Circular precision tubes
                      Tolerances meet or exceed the requirements of EN 10305-3
                      Maximum 0.10% of measured length
                      Characteristic
                      Height of internal weld bead (g)
                      Circular precision tubes
                      Tolerances meet or exceed the requirements of EN 10305-3

                      D > 1.000" (25.4 mm): g ≤ 0.012" (0.3 mm)
                      D = 1.000" (25.4 mm): g ≤ 0.040" (1.0 mm)
                      Characteristic
                      Mill length
                      Circular precision tubes
                      Tolerances meet or exceed the requirements of EN 10305-3
                      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

                      Coating and Surfaces

                      Surface designation and general usability

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                        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

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                          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.

                          Surface roughness, Ra

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                            Designation Ra value
                            UC, cold rolled

                            < 0.6 µm

                            UC, hot rolled

                            < 2.0 µm

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                              Designation
                              UC, cold rolled
                              Ra value

                              < 0.6 µm

                              Designation
                              UC, hot rolled
                              Ra value

                              < 2.0 µm

                              Delivery Conditions

                              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.

                              Fabrication and Other Recommendations

                              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.

                              Other precision tube products

                              Docol® Tube 780DP

                              Docol® Tube 980DP

                              SSAB Boron Tube 22

                              SSAB Form Tube 220

                              SSAB Form Tube 320

                              SSAB Form Tube 420