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 (mmin) 16 - 760.63 - 3.0
    Square (mmin) 19x19 - 60x60
    Rectangular (mmin) 25x15 - 80x40
    Wall thickness (mmin) 1.0 - 2.00.039 - 0.079
    Mill length (mm) 6000
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      Shapes
      Circular (mmin)
      Dimensions
      16 - 760.63 - 3.0
      Shapes
      Square (mmin)
      Dimensions
      19x19 - 60x60
      Shapes
      Rectangular (mmin)
      Dimensions
      25x15 - 80x40
      Shapes
      Wall thickness (mmin)
      Dimensions
      1.0 - 2.00.039 - 0.079
      Shapes
      Mill length (mm)
      Dimensions
      6000

      Other shapes, sizes and lengths are available upon request.

      Circular Dimensions

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        Outer diameter (mmin) 1.0 mm (kg/m) 1.25 mm (kg/m) 1.5 mm (kg/m) 2.0 mm (kg/m)
        160.63 0.370 0.455 0.536
        180.71 0.419 0.516 0.610
        190.75 0.444 0.547 0.647
        200.79 0.469 0.578 0.684 0.888
        220.87 0.518 0.640 0.758 0.986
        250.98 0.592 0.732 0.869 1.13
        281.1 0.666 0.825 0.980 1.28
        301.2 0.715 0.886 1.05 1.38
        321.3 0.765 0.948 1.13 1.48
        351.4 0.838 1.04 1.24 1.63
        381.5 0.912 1.13 1.35 1.78
        401.6 0.962 1.20 1.42 1.87
        411.6 1.22 1.46 1.92
        44.51.75 1.32 1.57 2.07
        481.9 1.44 1.72 2.27
        502.0 1.79 2.37
        552.2 1.98 2.61
        572.2 2.05 2.71
        602.4 2.16 2.86
        76.13.00 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 1.38
            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
                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 %)
                    CR600Y780T-DP 600 780 7
                    CR600Y780T-DH 600 780 12
                    CR700Y800T-DP 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 %)
                        CR600Y780T-DP 0.18 0.80 2.50 0.050 0.010 0.15 1.40 0.005 0.20
                        CR600Y780T-DH 0.18 0.80 2.50 0.050 0.010 0.15 1.40 0.005 0.20
                        CR700Y800T-DP 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)