Docol® Tube 780DP

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    General Product Description

    Docol®Tube 780DP is advance high-strength formable precision tube made from dual-phase steel with high tensile strength, improved formability or enhanced proofed yield strength. Available in circular, rectangular and square shapes, it comes with different coating and surface options including cold rolled (uncoated), galvanized, galvannealed and galfan. Customized shapes and other tailoring options are available upon request. Typically used in automotive industry where durability, formability and energy absorption are important.

    Dimension Range

    Docol Tube 780DP is available in circular, square and rectangular shapes.

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      Shapes Dimensions
      Circular (mm) 16 - 76
      Square (mm) 19x19 - 60x60
      Rectangular (mm) 25x15 - 80x40
      Wall thickness (mm) 1.0 - 2.0
      Mill length (mm) 6000
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        Shapes
        Circular (mm)
        Dimensions
        16 - 76
        Shapes
        Square (mm)
        Dimensions
        19x19 - 60x60
        Shapes
        Rectangular (mm)
        Dimensions
        25x15 - 80x40
        Shapes
        Wall thickness (mm)
        Dimensions
        1.0 - 2.0
        Shapes
        Mill length (mm)
        Dimensions
        6000

        Other shapes, sizes and lengths are available upon request.

        Circular Dimensions

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          Outer diameter (mm) 1.0 mm (kg/m) 1.25 mm (kg/m) 1.5 mm (kg/m) 2.0 mm (kg/m)
          16 0.370 0.455 0.536
          18 0.419 0.516 0.610
          19 0.444 0.547 0.647
          20 0.469 0.578 0.684 0.888
          22 0.518 0.640 0.758 0.986
          25 0.592 0.732 0.869 1.13
          28 0.666 0.825 0.980 1.28
          30 0.715 0.886 1.05 1.38
          32 0.765 0.948 1.13 1.48
          35 0.838 1.04 1.24 1.63
          36 0.863 1.07 1.28 1.68
          38 0.912 1.13 1.35 1.78
          40 0.962 1.20 1.42 1.87
          41 1.22 1.46 1.92
          44.5 1.32 1.57 2.07
          48 1.44 1.72 2.27
          50 1.79 2.37
          55 1.98 2.61
          57 2.05 2.71
          60 2.16 2.86
          76.1 2.76 3.65
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            Square Dimensions

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              Height x Width (mm) 1.0 mm (kg/m) 1.25 mm (kg/m) 1.5 mm (kg/m) 2.0 mm (kg/m)
              19 x 19 0.545 0.665
              20 x 20 0.576 0.704
              25 x 25 0.733 0.901 1.06
              30 x 30 0.890 1.10 1.30 1.68
              32 x 32 1.18 1.39 1.80
              35 x 35 1.29 1.53 1.99
              40 x 40 1.77 2.31
              50 x 50 2.24 2.93
              60 x 60 3.56
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                Rectangular Dimensions

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                  Height x Width (mm) 1.0 mm (kg/m) 1.25 mm (kg/m) 1.5 mm (kg/m) 2.0 mm (kg/m)
                  25 x 15 0.576 0.704
                  30 x 10 0.576 0.704 0.826
                  30 x 15 0.655 0.802
                  30 x 20 0.733 0.901 1.06
                  30 x 25 0.785 0.999 1.18 1.52
                  35 x 15 0.733 0.901 1.06
                  35 x 20 0.812 0.999 1.18 1.52
                  40 x 20 0.890 1.10 1.30 1.68
                  40 x 25 0.969 1.20 1.42 1.84
                  40 x 30 1.29 1.53 1.99
                  45 x 15 0.890 1.10 1.30 1.68
                  50 x 20 1.29 1.53 1.99
                  50 x 25 1.39 1.65 2.15
                  50 x 30 1.49 1.77 2.31
                  50 x 40 1.69 2.00 2.62
                  60 x 20 1.77 2.31
                  60 x 30 2.00 2.62
                  60 x 40 2.24 2.93
                  70 x 25 2.12 2.78
                  70 x 30 2.24 2.93
                  70 x 50 3.56
                  80 x 20 2.93
                  80 x 40 3.56
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                    Mechanical Properties

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                      Yield strength Rp0.2
                      (min MPa)
                      Tensile strength Rm
                      (min MPa)
                      Elongation A
                      (min %)
                      CR600Y780TDP 600 780 7
                      CR600Y780TDH 600 780 12
                      CR700Y800TDP 700 800 7
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                        Chemical Composition (ladle analysis)

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                          C
                          (max %)
                          Si
                          (max %)
                          Mn
                          (max %)
                          P
                          (max %)
                          S
                          (max %)
                          Nb+Ti
                          (max %)
                          Cr+Mo
                          (max %)
                          B
                          (max %)
                          Cu
                          (max %)
                          CR600Y780TDP 0.18 0.80 2.50 0.050 0.010 0.15 1.40 0.005 0.20
                          CR600Y780TDH 0.18 0.80 2.50 0.050 0.010 0.15 1.40 0.005 0.20
                          CR700Y800TDP 0.18 0.80 2.50 0.050 0.010 0.15 1.40 0.005 0.20
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                            Chemical composition meets the requirements of VDA 239-100.

                            Tolerances

                            Tolerance Circular

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                              Characteristic Circular precision tubes
                              Tolerances based on the requirements of EN 10305-3
                              Outside diameter (D) (1
                              D < 20 mm
                              20 ≤ D < 32 mm
                              32 ≤ D < 44 mm
                              44 ≤ D < 55 mm
                              55 ≤ D < 70 mm
                              70 ≤ D < 80 mm
                              80 ≤ D < 100 mm

                              ±0.12 mm
                              ±0.15 mm
                              ±0.20 mm
                              ±0.25 mm
                              ±0.30 mm
                              ±0.35 mm
                              ±0.40 mm
                              Out-of-roundness The diameter tolerances include the out-of-roundness
                              Thickness (T) T ≤ 1.5 mm: ±0.15 mm
                              T>1.5 mm: ±10% of nominal thickness or ±0.35 mm whichever is the smaller
                              Straightness Maximum 0.15% of measured length
                              Height of internal weld bead, g;
                              Bead removed
                              Bead not removed

                              g ≤ 0.3 mm
                              g < 1.0mm, when T ≤ 1.5 mm
                              g < 0.8 x T, when 1.5 mm < T ≤ 2.0 mm
                              Mill length 0/+50 mm, standard length 6000 mm
                              Exact length, single cutting Agreed at the time of enquiry and order
                              Exact length, bundle cutting Agreed at the time of enquiry and order
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                                Characteristic
                                Outside diameter (D) (1
                                D < 20 mm
                                20 ≤ D < 32 mm
                                32 ≤ D < 44 mm
                                44 ≤ D < 55 mm
                                55 ≤ D < 70 mm
                                70 ≤ D < 80 mm
                                80 ≤ D < 100 mm
                                Circular precision tubes
                                Tolerances based on the requirements of EN 10305-3

                                ±0.12 mm
                                ±0.15 mm
                                ±0.20 mm
                                ±0.25 mm
                                ±0.30 mm
                                ±0.35 mm
                                ±0.40 mm
                                Characteristic
                                Out-of-roundness
                                Circular precision tubes
                                Tolerances based on the requirements of EN 10305-3
                                The diameter tolerances include the out-of-roundness
                                Characteristic
                                Thickness (T)
                                Circular precision tubes
                                Tolerances based on the requirements of EN 10305-3
                                T ≤ 1.5 mm: ±0.15 mm
                                T>1.5 mm: ±10% of nominal thickness or ±0.35 mm whichever is the smaller
                                Characteristic
                                Straightness
                                Circular precision tubes
                                Tolerances based on the requirements of EN 10305-3
                                Maximum 0.15% of measured length
                                Characteristic
                                Height of internal weld bead, g;
                                Bead removed
                                Bead not removed
                                Circular precision tubes
                                Tolerances based on the requirements of EN 10305-3

                                g ≤ 0.3 mm
                                g < 1.0mm, when T ≤ 1.5 mm
                                g < 0.8 x T, when 1.5 mm < T ≤ 2.0 mm
                                Characteristic
                                Mill length
                                Circular precision tubes
                                Tolerances based on the requirements of EN 10305-3
                                0/+50 mm, standard length 6000 mm
                                Characteristic
                                Exact length, single cutting
                                Circular precision tubes
                                Tolerances based on the requirements of EN 10305-3
                                Agreed at the time of enquiry and order
                                Characteristic
                                Exact length, bundle cutting
                                Circular precision tubes
                                Tolerances based on the requirements of EN 10305-3
                                Agreed at the time of enquiry and order

                                1)For a maximum distance of 100 mm, the ends may, due to the cutting method, have diameters outside the tolerances.

                                Tolerance Square

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                                  Characteristic Square precision tubes
                                  Tolerances meet or exceed the requirements of EN 10305-5
                                  Outside dimensions (H) and (B), longer side1)
                                  H < 25 mm
                                  25 ≤ H < 40 mm
                                  40 ≤ H < 60 mm
                                  60≤ H < 70 mm

                                  ±0.20 mm
                                  ±0.25 mm
                                  ±0.30 mm
                                  ±0.35 mm
                                  Side concavity and convexity Included in outside dimension tolerance
                                  Thickness (T) T≤ 1.5 mm: ±0.15 mm
                                  T>1.5 mm: ±10% of nominal thickness or ±0.35 mm whichever is the smaller
                                  Straightness Maximum 0.15% of measured tube length when shorter side length > 30 mm
                                  Maximum 0.25% of measured tube length when the shorter side length ≤ 30 mm
                                  Location of weld seam from the centre line On narrow side for square and rectangular, optionally on wide side. On wide side for flat oval and ellipse. ± 10% of side length or ± 3 mm, whichever is greater.
                                  Height of internal weld bead, g;
                                  Bead removed
                                  Bead not removed

                                  g ≤ 0.3 mm
                                  g < 1.0 mm, when T ≤ 1.5 mm
                                  g < 0.8 x T, when 1.5 mm < T ≤ 2.0 mm
                                  Squareness of side 90° ±1°
                                  Corner profile R ≤ 4.0 x T, typically R ≤ 2.5 x T
                                  Twist (V) V ≤ 3 mm for B and H ≤ 30 mm
                                  V ≤ B/10 or ≤ H/10 for B or H > 30 mm
                                  Mill length 0/+50 mm, standard length 6000 mm
                                  Exact length, single cutting Agreed at the time of enquiry and order
                                  Exact length, bundle cutting Agreed at the time of enquiry and order
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                                    Characteristic
                                    Outside dimensions (H) and (B), longer side1)
                                    H < 25 mm
                                    25 ≤ H < 40 mm
                                    40 ≤ H < 60 mm
                                    60≤ H < 70 mm
                                    Square precision tubes
                                    Tolerances meet or exceed the requirements of EN 10305-5

                                    ±0.20 mm
                                    ±0.25 mm
                                    ±0.30 mm
                                    ±0.35 mm
                                    Characteristic
                                    Side concavity and convexity
                                    Square precision tubes
                                    Tolerances meet or exceed the requirements of EN 10305-5
                                    Included in outside dimension tolerance
                                    Characteristic
                                    Thickness (T)
                                    Square precision tubes
                                    Tolerances meet or exceed the requirements of EN 10305-5
                                    T≤ 1.5 mm: ±0.15 mm
                                    T>1.5 mm: ±10% of nominal thickness or ±0.35 mm whichever is the smaller
                                    Characteristic
                                    Straightness
                                    Square precision tubes
                                    Tolerances meet or exceed the requirements of EN 10305-5
                                    Maximum 0.15% of measured tube length when shorter side length > 30 mm
                                    Maximum 0.25% of measured tube length when the shorter side length ≤ 30 mm
                                    Characteristic
                                    Location of weld seam from the centre line
                                    Square precision tubes
                                    Tolerances meet or exceed the requirements of EN 10305-5
                                    On narrow side for square and rectangular, optionally on wide side. On wide side for flat oval and ellipse. ± 10% of side length or ± 3 mm, whichever is greater.
                                    Characteristic
                                    Height of internal weld bead, g;
                                    Bead removed
                                    Bead not removed
                                    Square precision tubes
                                    Tolerances meet or exceed the requirements of EN 10305-5

                                    g ≤ 0.3 mm
                                    g < 1.0 mm, when T ≤ 1.5 mm
                                    g < 0.8 x T, when 1.5 mm < T ≤ 2.0 mm
                                    Characteristic
                                    Squareness of side
                                    Square precision tubes
                                    Tolerances meet or exceed the requirements of EN 10305-5
                                    90° ±1°
                                    Characteristic
                                    Corner profile
                                    Square precision tubes
                                    Tolerances meet or exceed the requirements of EN 10305-5
                                    R ≤ 4.0 x T, typically R ≤ 2.5 x T
                                    Characteristic
                                    Twist (V)
                                    Square precision tubes
                                    Tolerances meet or exceed the requirements of EN 10305-5
                                    V ≤ 3 mm for B and H ≤ 30 mm
                                    V ≤ B/10 or ≤ H/10 for B or H > 30 mm
                                    Characteristic
                                    Mill length
                                    Square precision tubes
                                    Tolerances meet or exceed the requirements of EN 10305-5
                                    0/+50 mm, standard length 6000 mm
                                    Characteristic
                                    Exact length, single cutting
                                    Square precision tubes
                                    Tolerances meet or exceed the requirements of EN 10305-5
                                    Agreed at the time of enquiry and order
                                    Characteristic
                                    Exact length, bundle cutting
                                    Square precision tubes
                                    Tolerances meet or exceed the requirements of EN 10305-5
                                    Agreed at the time of enquiry and order

                                    1)For a maximum distance of 100 mm, the ends may, due to the cutting method, have diameters outside the tolerances.

                                    Tolerance Rectangular

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                                      Characteristic Rectangular precision tubes
                                      Tolerances meet or exceed the requirements of EN 10305-5
                                      Outside dimensions (H) and (B), longer side1)
                                      H < 25 mm
                                      25 ≤ H < 40 mm
                                      40 ≤ H < 60 mm
                                      60≤ H < 70 mm
                                      70 ≤ H < 80 mm
                                      80 ≤ H < 90 mm
                                      90 ≤ H < 100 mm
                                      100 ≤ H < 120 mm

                                      ±0.20 mm
                                      ±0.25 mm
                                      ±0.30 mm
                                      ±0.35 mm
                                      ±0.40 mm
                                      ±0.50 mm
                                      Side concavity and convexity Included in outside dimension tolerance
                                      Thickness (T) T≤ 1.5 mm: ±0.15 mm
                                      T>1.5 mm: ±10% of nominal thickness or ±0.35 mm whichever is the smaller
                                      Straightness Maximum 0.15% of measured tube length when shorter side length > 30 mm
                                      Maximum 0.25% of measured tube length when the shorter side length ≤ 30 mm
                                      Location of weld seam from the centre line On narrow side for square and rectangular, optionally on wide side. On wide side for flat oval and ellipse. ± 10% of side length or ± 3 mm, whichever is greater.
                                      Height of internal weld bead, g;
                                      Bead removed
                                      Bead not removed

                                      g ≤ 0.3 mm
                                      g < 1.0 mm, when T ≤ 1.5 mm
                                      g < 0.8 x T, when 1.5 mm < T ≤ 2.0 mm
                                      Squareness of side 90° ±1°
                                      Corner profile R ≤ 4.0 x T, typically R ≤ 2.5 x T
                                      Twist (V) V ≤ 3 mm for B and H ≤ 30 mm
                                      V ≤ B/10 or ≤ H/10 for B or H > 30 mm
                                      Mill length 0/+50 mm, standard length 6000 mm
                                      Exact length, single cutting Agreed at the time of enquiry and order
                                      Exact length, bundle cutting Agreed at the time of enquiry and order
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                                        Characteristic
                                        Outside dimensions (H) and (B), longer side1)
                                        H < 25 mm
                                        25 ≤ H < 40 mm
                                        40 ≤ H < 60 mm
                                        60≤ H < 70 mm
                                        70 ≤ H < 80 mm
                                        80 ≤ H < 90 mm
                                        90 ≤ H < 100 mm
                                        100 ≤ H < 120 mm
                                        Rectangular precision tubes
                                        Tolerances meet or exceed the requirements of EN 10305-5

                                        ±0.20 mm
                                        ±0.25 mm
                                        ±0.30 mm
                                        ±0.35 mm
                                        ±0.40 mm
                                        ±0.50 mm
                                        Characteristic
                                        Side concavity and convexity
                                        Rectangular precision tubes
                                        Tolerances meet or exceed the requirements of EN 10305-5
                                        Included in outside dimension tolerance
                                        Characteristic
                                        Thickness (T)
                                        Rectangular precision tubes
                                        Tolerances meet or exceed the requirements of EN 10305-5
                                        T≤ 1.5 mm: ±0.15 mm
                                        T>1.5 mm: ±10% of nominal thickness or ±0.35 mm whichever is the smaller
                                        Characteristic
                                        Straightness
                                        Rectangular precision tubes
                                        Tolerances meet or exceed the requirements of EN 10305-5
                                        Maximum 0.15% of measured tube length when shorter side length > 30 mm
                                        Maximum 0.25% of measured tube length when the shorter side length ≤ 30 mm
                                        Characteristic
                                        Location of weld seam from the centre line
                                        Rectangular precision tubes
                                        Tolerances meet or exceed the requirements of EN 10305-5
                                        On narrow side for square and rectangular, optionally on wide side. On wide side for flat oval and ellipse. ± 10% of side length or ± 3 mm, whichever is greater.
                                        Characteristic
                                        Height of internal weld bead, g;
                                        Bead removed
                                        Bead not removed
                                        Rectangular precision tubes
                                        Tolerances meet or exceed the requirements of EN 10305-5

                                        g ≤ 0.3 mm
                                        g < 1.0 mm, when T ≤ 1.5 mm
                                        g < 0.8 x T, when 1.5 mm < T ≤ 2.0 mm
                                        Characteristic
                                        Squareness of side
                                        Rectangular precision tubes
                                        Tolerances meet or exceed the requirements of EN 10305-5
                                        90° ±1°
                                        Characteristic
                                        Corner profile
                                        Rectangular precision tubes
                                        Tolerances meet or exceed the requirements of EN 10305-5
                                        R ≤ 4.0 x T, typically R ≤ 2.5 x T
                                        Characteristic
                                        Twist (V)
                                        Rectangular precision tubes
                                        Tolerances meet or exceed the requirements of EN 10305-5
                                        V ≤ 3 mm for B and H ≤ 30 mm
                                        V ≤ B/10 or ≤ H/10 for B or H > 30 mm
                                        Characteristic
                                        Mill length
                                        Rectangular precision tubes
                                        Tolerances meet or exceed the requirements of EN 10305-5
                                        0/+50 mm, standard length 6000 mm
                                        Characteristic
                                        Exact length, single cutting
                                        Rectangular precision tubes
                                        Tolerances meet or exceed the requirements of EN 10305-5
                                        Agreed at the time of enquiry and order
                                        Characteristic
                                        Exact length, bundle cutting
                                        Rectangular precision tubes
                                        Tolerances meet or exceed the requirements of EN 10305-5
                                        Agreed at the time of enquiry and order

                                        1)For a maximum distance of 100 mm, the ends may, due to the cutting method, have diameters outside the tolerances.

                                        Coating and Surfaces

                                        Surface designation and general usability

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                                          Designation Definition Usability
                                          UC Uncoated (cold rolled) Paintability or chromium plating are required
                                          GI Zinc coated (zinc 99%) Corrosion resistance is required
                                          ZA Galfan coated (zinc 95%-aluminium 5%) Corrosion resistance and demanding forming are required
                                          GA Galvannealed coated (zinc 90%-iron 10%) Corrosion resistance and paintability are required
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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
                                              C < 0.6 µm
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                                                Designation
                                                C
                                                Ra value
                                                < 0.6 µm

                                                Different metal coatings and minimum coating mass

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                                                  Coating thickness 1)(µm) Zinc (GI) 2) (g/m2) Galfan (ZA) 3) (g/m2) Galvannealed (GA) 2) (g/m2)
                                                  7 GI50/50 GA50/50
                                                  8 GI60/60 GA60/60
                                                  20 GI115/115 ZA255
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                                                    1) Theoretical guidance values for coating thickness per surface.

                                                    2) Minimum coating mass - g/m2 refers the coating mass for each side in g/m2 according to VDA 239-100.

                                                    3) Minimum coating mass - g/m2 refers the total weight of coatings on both sides of a 1 m2 plate.

                                                    Indicative specification for proper coating selection

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                                                      Coating type Coating mass (g/m2) Coating life - marine (year) Properties
                                                      GI 50/50 10 Good weldability and formability with tolerable corrosion resistance.
                                                      GI 115/115 25 Good combination of corrosion resistance and usability.
                                                      ZA 255 80 Superior corrosion resistance in marine condition.
                                                      GA 50/50 15 Superior paint adhesion and corrosion reistance as painted. Weldability in same level as cold rolled material under proper welding conditions.
                                                      GA 60/60 17 Superior paint adhesion and corrosion reistance as painted. Weldability in same level as cold rolled material under proper welding conditions.
                                                      GA 140 20 Superior paint adhesion and corrosion reistance as painted. Weldability in same level as cold rolled material under proper welding conditions.
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                                                        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 (+CR2 delivery condition according to EN 10305-3 and -5).

                                                        The tubes are oiled with anti-corrosive oil (S4 condition according to EN 10305-3 and -5).

                                                        Fabrication and Other Recommendations

                                                        Further Fabrication

                                                        Pre-heating of the tubes before bending and welding may lower the strength of the material. Docol Tube 780 is not suitable for hot dip galvanizing. Outside the welded area the surface roughness (Ra) is typically 0.25-0.75 μm.

                                                        Bending

                                                        The bendability of Docol Tube 780 steels is good and the recommended minimum bending radius is 2.5 x tube diameter. The optimal radial gap between mandrel and inside wall of the tube should be in the range of 0.10 to 0.15 mm.

                                                        Welding

                                                        Docol Tube 780 tubes have very low content of alloying elements in relation to the high strength of the steels and the weldability of Docol Tube 780 is very good. Recommendations in accordance to Eurocode 3 apply for welding. For information and recommendations for welding Docol Tube 780, see welding brochure for SSAB Docol products and Steelfacts at www.ssab.com.

                                                        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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