SSAB Form Tube 420

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    General Product Description

    Form Tube 420 is high-strength formable precision tube. It has 15% higher elongation values and very narrow tolerances compared with competing products. Available in circular, rectangular, square and special shapes, it comes with different coating and surface options including cold rolled, galvanized, galvannealed and galfan. Customized shapes and other tailoring options are available upon request. Typically uses include light engineering, where formability, uniform quality, different surface options and usability are important.

    Dimension Range

    SSAB Form Tube 420 is available in circular, square and rectangular shapes.

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      Shapes Dimensions
      Circular (mm) 16 - 88.9
      Square (mm) 19x19 - 70x70
      Rectangular (mm) 25x15 - 100x40
      Wall thickness (mm) 0.9 - 3.0
      Mill length (mm) 6000
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        Shapes
        Circular (mm)
        Dimensions
        16 - 88.9
        Shapes
        Square (mm)
        Dimensions
        19x19 - 70x70
        Shapes
        Rectangular (mm)
        Dimensions
        25x15 - 100x40
        Shapes
        Wall thickness (mm)
        Dimensions
        0.9 - 3.0
        Shapes
        Mill length (mm)
        Dimensions
        6000

        Other shapes, sizes and lengths are available upon request.

        Circular Dimensions

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          Outer diameter (mm) 0.9 mm (kg/m) 1.0 mm (kg/m) 1.25 mm (kg/m) 1.5 mm (kg/m) 2.0 mm (kg/m) 2.5 mm (kg/m) 3.0 mm (kg/m)
          16 0.335 0.370 0.455 0.536 0.691 1)
          18 0.380 0.419 0.516 0.610 0.789
          19 0.402 0.444 0.547 0.647 0.838
          20 0.424 0.469 0.578 0.684 0.888
          22 0.468 0.518 0.640 0.758 0.986 1.20 1)
          25 0.535 0.592 0.732 0.869 1.13 1.39 1) 1.63 1)
          28 0.601 0.666 0.825 0.980 1.28 1.57 1.85
          30 0.646 0.715 0.886 1.05 1.38 1.70 2.00
          32 0.765 0.948 1.13 1.48 1.82 2.15
          35 0.838 1.04 1.24 1.63 2.00 2.37
          38 0.912 1.13 1.35 1.78 2.19 2.59
          40 0.962 1.20 1.42 1.87 2.31 2.74
          41 0.990 1.22 1.46 1.92 2.37 2.81
          44.5 1.07 1.33 1.59 2.10 2.59 3.07
          48 1.44 1.72 2.27 2.81 3.33
          50 1.50 1.79 2.37 2.93 3.48
          55 1.66 1.98 2.61 3.24 3.85
          57 1.72 2.05 2.71 3.36 4.00
          60 1.81 2.16 2.86 3.55 4.22
          76.1 2.76 3.65 4.54 5.41
          88.9 4.29 5.33 6.36
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          Comparison

            1) Elongation A-value according to +CR2, 12%.

            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) 2.5 mm (kg/m) 3.0 mm (kg/m)
              19 x 19 0.564 0.694 0.820 1.06 1)
              20 x 20 0.595 0.733 0.868 1.12 1)
              25 x 25 0.752 0.930 1.10 1.44
              30 x 30 0.909 1.13 1.34 1.75 2.15 2.39
              32 x 32 0.972 1.20 1.43 1.88 2.31 2.58
              35 x 35 1.07 1.32 1.57 2.07 2.54 2.86
              40 x 40 1.52 1.81 2.38 2.93 3.33
              50 x 50 1.91 2.28 3.01 3.72 4.28
              60 x 60 2.75 3.64 4.50 5.22
              70 x 70 4.26 5.29 6.16
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                1) Elongation A-value according to +CR2, 12%.

                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) 2.5 mm (kg/m) 3.0 mm (kg/m)
                  25 x 15 0.595 0.733 0.868 1.12 1)
                  30 x 10 0.595 0.733 0.868 1.12
                  30 x 15 0.673 0.831 0.985 1.28
                  30 x 20 0.752 0.930 1.10 1.44
                  30 x 25 0.830 1.03 1.22 1.59 1.95
                  35 x 15 0.752 0.930 1.10 1.44
                  35 x 20 0.830 1.03 1.22 1.59 1.95
                  40 x 20 0.909 1.13 1.34 1.75 2.15
                  40 x 25 0.987 1.22 1.46 1.91 2.34
                  40 x 30 1.07 1.32 1.57 2.07 2.54 2.86
                  50 x 20 1.07 1.32 1.57 2.07 2.54 2.86
                  50 x 25 1.42 1.69 2.22 2.74 3.10
                  50 x 30 1.52 1.81 2.38 2.93 3.33
                  50 x 40 1.71 2.05 2.69 3.33 3.80
                  60 x 20 1.52 1.81 2.38 2.93 3.33
                  60 x 30 1.71 2.05 2.69 3.33 3.80
                  60 x 40 1.91 2.28 3.01 3.72 4.28
                  70 x 25 2.16 2.85 3.52 4.04
                  70 x 30 2.28 3.01 3.72 4.28
                  70 x 50 2.75 3.64 4.50 5.22
                  80 x 20 2.28 3.01 3.72 4.28
                  80 x 30 2.52 3.32 4.11 4.74
                  80 x 40 2.75 3.64 4.50 5.22
                  80 x 60 4.26 5.29 6.16
                  100 x 40 4.26 5.29 6.16
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                  Comparison

                    1) Elongation A-value according to +CR2, 12%.

                    Mechanical Properties

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                      Yield strength Rp0.2
                      (min MPa)
                      Tensile strength Rm
                      (min MPa)
                      Elongation A
                      (min %)
                      420 490 14
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                      Comparison

                        Mechanical properties meet or exceed the requirements of EN 10305 (+CR2).

                        Chemical Composition (ladle analysis)

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                          C
                          (max %)
                          Si 1)
                          (max %)
                          Mn
                          (max %)
                          P 1)
                          (max %)
                          S 2)
                          (max %)
                          Altot 3)
                          (min %)
                          0.12 0.50 1.70 0.020 2) 0.020 0.020
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                          Comparison

                            Chemical composition meets or exceeds the requirements of EN 10305.

                            If other chemical elements such as Ti, Nb or V are used, the content of these elements are reported in the inspection document.

                            1) SSAB Form Tube H grade is suitable for high quality hot-dip galvanizing (Si < 0.03%, Si +2.5P < 0.06%)

                            2) Low level of impurities ensure excellent formability and weldability

                            3) This requirement is not applicable provided the steel contains a sufficient amount of other nitrogen binding elements, such as Ti, Nb or V.

                            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
                              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 < 0.6 mm, when T ≤ 1.5 mm
                              g < 0.4 x T, when 1.5 mm < T ≤ 3.0 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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                              Comparison

                                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 meet or exceed 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 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 ≤ 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 meet or exceed 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 meet or exceed the requirements of EN 10305-3

                                g ≤ 0.3 mm
                                g < 0.6 mm, when T ≤ 1.5 mm
                                g < 0.4 x T, when 1.5 mm < T ≤ 3.0 mm
                                Characteristic
                                Mill length
                                Circular precision tubes
                                Tolerances meet or exceed the requirements of EN 10305-3
                                0/+50 mm, standard length 6000 mm
                                Characteristic
                                Exact length, single cutting
                                Circular precision tubes
                                Tolerances meet or exceed the requirements of EN 10305-3
                                Agreed at the time of enquiry and order
                                Characteristic
                                Exact length, bundle cutting
                                Circular precision tubes
                                Tolerances meet or exceed 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
                                  70 ≤ H < 80 mm

                                  ±0.20 mm
                                  ±0.25 mm
                                  ±0.30 mm
                                  ±0.35 mm
                                  ±0.40 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 < 0.6 mm, when T ≤ 1.5 mm
                                  g < 0.4 x T, when 1.5 mm < T ≤ 3.0 mm
                                  Squareness of side 90° ±1°
                                  Corner profile R < 1.5 x T, when T ≤ 2.5 mm
                                  R < 2.2 x T, when T > 2.5 mm
                                  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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                                  Comparison

                                    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
                                    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
                                    ±0.40 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 < 0.6 mm, when T ≤ 1.5 mm
                                    g < 0.4 x T, when 1.5 mm < T ≤ 3.0 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 < 1.5 x T, when T ≤ 2.5 mm
                                    R < 2.2 x T, when T > 2.5 mm
                                    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
                                      ±0.60 mm
                                      ±0.65 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 < 0.6 mm, when T ≤ 1.5 mm
                                      g < 0.4 x T, when 1.5 mm < T ≤ 3.0 mm
                                      Squareness of side 90° ±1°
                                      Corner profile R < 1.5 x T, when T ≤ 2.5 mm
                                      R < 2.2 x T, when T > 2.5 mm
                                      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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                                      Comparison

                                        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
                                        ±0.60 mm
                                        ±0.65 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 < 0.6 mm, when T ≤ 1.5 mm
                                        g < 0.4 x T, when 1.5 mm < T ≤ 3.0 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 < 1.5 x T, when T ≤ 2.5 mm
                                        R < 2.2 x T, when T > 2.5 mm
                                        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.

                                        Surface designation and general usability

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                                          Designation Definition Usability
                                          C Cold rolled Suitable for painting and chromium plating
                                          H Hot rolled and pickled Suitable for painting and hot-dip galvanizing
                                          Z Zinc coated (zinc 99%) Suitable when corrosion resistance is required
                                          ZA Galfan coated (zinc 95%-aluminium 5%) Suitable when corrosion resistance and demanding forming are required
                                          ZF Galvannealed coated (zinc 90%-iron 10%) Suitable when 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
                                              H < 2.0 µm
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                                                Designation
                                                C
                                                Ra value
                                                < 0.6 µm
                                                Designation
                                                H
                                                Ra value
                                                < 2.0 µm

                                                Different metal coatings and minimum coating mass

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                                                  Coating thickness 1)(µm) Zinc (Z) 2) (g/m2) Galfan (ZA) 2) (g/m2) Galvannealed (ZF) 2) (g/m2)
                                                  7 Z100 ZF100
                                                  8 ZF120
                                                  10 Z140 ZA130 ZF140
                                                  20 Z275 ZA255
                                                  25 Z350 ZA300
                                                  32 Z450
                                                  42 Z600
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                                                    Galfan coating ZA255 by SSAB has been granted a C3 15 (years) certification by RISE, Research Institute of Sweden AB.

                                                    1) Theoretical guidance values for coating thickness per surface.

                                                    2) 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
                                                      Z 100 10 Good weldability and formability with tolerable corrosion resistance.
                                                      Z 275 25 Good combination of corrosion resistance and usability.
                                                      Z 350 30 Excellent corrosion resistance.
                                                      Z 450 40 Excellent corrosion resistance.
                                                      Z 600 60 Superior corrosion resistance.
                                                      ZA 130 40 Excellent corrosion resistance and formability.
                                                      ZA 255 80 Superior corrosion resistance in marine condition.
                                                      ZA 300 95 Superior corrosion resistance in marine condition.
                                                      ZF 100 15 Superior paint adhesion and corrosion reistance as painted. Weldability in same level as cold rolled material under proper welding conditions.
                                                      ZF 120 17 Superior paint adhesion and corrosion reistance as painted. Weldability in same level as cold rolled material under proper welding conditions.
                                                      ZF 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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