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

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