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.

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

Other shapes, sizes and lengths are available upon request.

Circular Dimensions

Outer diameter (mmin)
Outer diameter (mmin)
160.63
1.0 mm (kg/m)
0.370
1.25 mm (kg/m)
0.455
1.5 mm (kg/m)
0.536
2.0 mm (kg/m)
—
Outer diameter (mmin)
Outer diameter (mmin)
180.71
1.0 mm (kg/m)
0.419
1.25 mm (kg/m)
0.516
1.5 mm (kg/m)
0.610
2.0 mm (kg/m)
—
Outer diameter (mmin)
Outer diameter (mmin)
190.75
1.0 mm (kg/m)
0.444
1.25 mm (kg/m)
0.547
1.5 mm (kg/m)
0.647
2.0 mm (kg/m)
—
Outer diameter (mmin)
Outer diameter (mmin)
200.79
1.0 mm (kg/m)
0.469
1.25 mm (kg/m)
0.578
1.5 mm (kg/m)
0.684
2.0 mm (kg/m)
0.888
Outer diameter (mmin)
Outer diameter (mmin)
220.87
1.0 mm (kg/m)
0.518
1.25 mm (kg/m)
0.640
1.5 mm (kg/m)
0.758
2.0 mm (kg/m)
0.986
Outer diameter (mmin)
Outer diameter (mmin)
250.98
1.0 mm (kg/m)
0.592
1.25 mm (kg/m)
0.732
1.5 mm (kg/m)
0.869
2.0 mm (kg/m)
1.13
Outer diameter (mmin)
Outer diameter (mmin)
281.1
1.0 mm (kg/m)
0.666
1.25 mm (kg/m)
0.825
1.5 mm (kg/m)
0.980
2.0 mm (kg/m)
1.28
Outer diameter (mmin)
Outer diameter (mmin)
301.2
1.0 mm (kg/m)
0.715
1.25 mm (kg/m)
0.886
1.5 mm (kg/m)
1.05
2.0 mm (kg/m)
1.38
Outer diameter (mmin)
Outer diameter (mmin)
321.3
1.0 mm (kg/m)
0.765
1.25 mm (kg/m)
0.948
1.5 mm (kg/m)
1.13
2.0 mm (kg/m)
1.48
Outer diameter (mmin)
Outer diameter (mmin)
351.4
1.0 mm (kg/m)
0.838
1.25 mm (kg/m)
1.04
1.5 mm (kg/m)
1.24
2.0 mm (kg/m)
1.63
Outer diameter (mmin)
Outer diameter (mmin)
381.5
1.0 mm (kg/m)
0.912
1.25 mm (kg/m)
1.13
1.5 mm (kg/m)
1.35
2.0 mm (kg/m)
1.78
Outer diameter (mmin)
Outer diameter (mmin)
401.6
1.0 mm (kg/m)
0.962
1.25 mm (kg/m)
1.20
1.5 mm (kg/m)
1.42
2.0 mm (kg/m)
1.87
Outer diameter (mmin)
Outer diameter (mmin)
411.6
1.0 mm (kg/m)
—
1.25 mm (kg/m)
1.22
1.5 mm (kg/m)
1.46
2.0 mm (kg/m)
1.92
Outer diameter (mmin)
Outer diameter (mmin)
44.51.75
1.0 mm (kg/m)
—
1.25 mm (kg/m)
1.32
1.5 mm (kg/m)
1.57
2.0 mm (kg/m)
2.07
Outer diameter (mmin)
Outer diameter (mmin)
481.9
1.0 mm (kg/m)
—
1.25 mm (kg/m)
1.44
1.5 mm (kg/m)
1.72
2.0 mm (kg/m)
2.27
Outer diameter (mmin)
Outer diameter (mmin)
502.0
1.0 mm (kg/m)
—
1.25 mm (kg/m)
—
1.5 mm (kg/m)
1.79
2.0 mm (kg/m)
2.37
Outer diameter (mmin)
Outer diameter (mmin)
552.2
1.0 mm (kg/m)
—
1.25 mm (kg/m)
—
1.5 mm (kg/m)
1.98
2.0 mm (kg/m)
2.61
Outer diameter (mmin)
Outer diameter (mmin)
572.2
1.0 mm (kg/m)
—
1.25 mm (kg/m)
—
1.5 mm (kg/m)
2.05
2.0 mm (kg/m)
2.71
Outer diameter (mmin)
Outer diameter (mmin)
602.4
1.0 mm (kg/m)
—
1.25 mm (kg/m)
—
1.5 mm (kg/m)
2.16
2.0 mm (kg/m)
2.86
Outer diameter (mmin)
Outer diameter (mmin)
76.13.00
1.0 mm (kg/m)
—
1.25 mm (kg/m)
—
1.5 mm (kg/m)
2.76
2.0 mm (kg/m)
3.65

Square Dimensions

Height x Width (mm)
Height x Width (mm)
19 x 19
1.0 mm (kg/m)
0.545
1.25 mm (kg/m)
0.665
1.5 mm (kg/m)
—
2.0 mm (kg/m)
—
Height x Width (mm)
Height x Width (mm)
20 x 20
1.0 mm (kg/m)
0.576
1.25 mm (kg/m)
0.704
1.5 mm (kg/m)
—
2.0 mm (kg/m)
—
Height x Width (mm)
Height x Width (mm)
25 x 25
1.0 mm (kg/m)
0.733
1.25 mm (kg/m)
0.901
1.5 mm (kg/m)
1.06
2.0 mm (kg/m)
1.38
Height x Width (mm)
Height x Width (mm)
30 x 30
1.0 mm (kg/m)
0.890
1.25 mm (kg/m)
1.10
1.5 mm (kg/m)
1.30
2.0 mm (kg/m)
1.68
Height x Width (mm)
Height x Width (mm)
32 x 32
1.0 mm (kg/m)
—
1.25 mm (kg/m)
1.18
1.5 mm (kg/m)
1.39
2.0 mm (kg/m)
1.80
Height x Width (mm)
Height x Width (mm)
35 x 35
1.0 mm (kg/m)
—
1.25 mm (kg/m)
1.29
1.5 mm (kg/m)
1.53
2.0 mm (kg/m)
1.99
Height x Width (mm)
Height x Width (mm)
40 x 40
1.0 mm (kg/m)
—
1.25 mm (kg/m)
—
1.5 mm (kg/m)
1.77
2.0 mm (kg/m)
2.31
Height x Width (mm)
Height x Width (mm)
50 x 50
1.0 mm (kg/m)
—
1.25 mm (kg/m)
—
1.5 mm (kg/m)
2.24
2.0 mm (kg/m)
2.93
Height x Width (mm)
Height x Width (mm)
60 x 60
1.0 mm (kg/m)
—
1.25 mm (kg/m)
—
1.5 mm (kg/m)
—
2.0 mm (kg/m)
3.56

Rectangular Dimensions

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

Mechanical Properties

CR600Y780T-DP

Yield strength Rp0.2
(min MPa)
600
Tensile strength Rm
(min MPa)
780
Elongation A
(min %)
8

CR600Y780T-DH

Yield strength Rp0.2
(min MPa)
600
Tensile strength Rm
(min MPa)
780
Elongation A
(min %)
5

Chemical Composition (ladle analysis)

CR600Y780T-DP

C
(max %)
0.18
Si
(max %)
0.80
Mn
(max %)
2.50
P
(max %)
0.050
S
(max %)
0.010
Nb+Ti
(max %)
0.15
Cr+Mo
(max %)
1.40
B
(max %)
0.005
Cu
(max %)
0.20

CR600Y780T-DH

C
(max %)
0.18
Si
(max %)
0.80
Mn
(max %)
2.50
P
(max %)
0.050
S
(max %)
0.010
Nb+Ti
(max %)
0.15
Cr+Mo
(max %)
1.40
B
(max %)
0.005
Cu
(max %)
0.20

Chemical composition meets the requirements of VDA 239-100.

Tolerances

Tolerance Circular

Characteristic
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
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
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
Characteristic
Straightness
Circular precision tubes
Tolerances meet or exceed the requirements of EN 10305-3
Maximum 0.15% of measured length
Characteristic
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 < 1.0mm, when T ≤ 1.5 mm
g < 0.8 x T, when 1.5 mm < T ≤ 2.0 mm
Characteristic
Characteristic
Mill length
Circular precision tubes
Tolerances meet or exceed the requirements of EN 10305-3
0/+50 mm, standard length 6000 mm
Characteristic
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
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

Characteristic
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
Characteristic
Side concavity and convexity
Square precision tubes
Tolerances meet or exceed the requirements of EN 10305-5
Included in outside dimension tolerance
Characteristic
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
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
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
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 < 1.0mm, when T ≤ 1.5 mm
g < 0.8 x T, when 1.5 mm < T ≤ 2.0 mm
Characteristic
Characteristic
Squareness of side
Square precision tubes
Tolerances meet or exceed the requirements of EN 10305-5
90° ±1°
Characteristic
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
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
Characteristic
Mill length
Square precision tubes
Tolerances meet or exceed the requirements of EN 10305-5
0/+50 mm, standard length 6000 mm
Characteristic
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
Characteristic
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

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

Tolerance Rectangular

Characteristic
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
Characteristic
Side concavity and convexity
Rectangular precision tubes
Tolerances meet or exceed the requirements of EN 10305-5
Included in outside dimension tolerance
Characteristic
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
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
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
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 < 1.0mm, when T ≤ 1.5 mm
g < 0.8 x T, when 1.5 mm < T ≤ 2.0 mm
Characteristic
Characteristic
Squareness of side
Rectangular precision tubes
Tolerances meet or exceed the requirements of EN 10305-5
90° ±1°
Characteristic
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
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
Characteristic
Mill length
Rectangular precision tubes
Tolerances meet or exceed the requirements of EN 10305-5
0/+50 mm, standard length 6000 mm
Characteristic
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
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

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

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

Designation
Designation
C
Ra value
< 0.6 μm

Different metal coatings and minimum coating mass

Coating thickness 1)(µm)
Coating thickness 1)(µm)
7
Zinc (GI) 2) (g/m2)
GI50/50
Galfan (ZA) 3) (g/m2)
—
Galvannealed (GA) 2) (g/m2)
GA50/50
Coating thickness 1)(µm)
Coating thickness 1)(µm)
8
Zinc (GI) 2) (g/m2)
GI60/60
Galfan (ZA) 3) (g/m2)
—
Galvannealed (GA) 2) (g/m2)
GA60/60
Coating thickness 1)(µm)
Coating thickness 1)(µm)
20
Zinc (GI) 2) (g/m2)
GI115/115
Galfan (ZA) 3) (g/m2)
ZA255
Galvannealed (GA) 2) (g/m2)
—

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

Coating type
Coating type
GI
Coating mass (g/m2)
50/50
Coating life - marine (year)
10
Properties
Good weldability and formability with tolerable corrosion resistance.
Coating type
Coating type
GI
Coating mass (g/m2)
115/115
Coating life - marine (year)
25
Properties
Good combination of corrosion resistance and usability.
Coating type
Coating type
ZA
Coating mass (g/m2)
225
Coating life - marine (year)
80
Properties
Superior corrosion resistance in marine condition.
Coating type
Coating type
GA
Coating mass (g/m2)
50/50
Coating life - marine (year)
15
Properties
Superior paint adhesion and corrosion resistance as painted. Weldability in same level as cold rolled material under proper welding conditions.
Coating type
Coating type
GA
Coating mass (g/m2)
60/60
Coating life - marine (year)
17
Properties
Superior paint adhesion and corrosion resistance as painted. Weldability in same level as cold rolled material under proper welding conditions.
Coating type
Coating type
GA
Coating mass (g/m2)
140
Coating life - marine (year)
20
Properties
Superior paint adhesion and corrosion resistance as painted. Weldability in same level as cold rolled material under proper welding conditions.

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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