Docol® Tube R8

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General Product Description

Docol® Tube R8 is a product range of welded cold formed circular tubes in high strength steel, specifically targeted at the requirements of the Motor Sport industry and similar producers. It is intended for applications requiring a combination of extremely high performance and lean design. Docol Tube R8 is produced using tube designated SSAB high strength steel, with high yield strength in combination with excellent bending and welding properties. Docol Tube R8 tubes are produced with narrow tolerances, including inside weld bead height. Delivery condition of Docol Tube R8 is according to EN 10305-3 and R8 tubes are always accompanied by inspection certificate 3.1. Docol Tube R8 is approved as an allowable material in the SFI specifications for roll cages in different types of drag racing vehicles.

Dimension Range

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

Docol Tube R8 is available in circular shape.

Other shapes, sizes and lengths are available upon request.

1) (25.4 - 50.8 mm)

2) (1.24 - 2.41 mm)

3) (5791 mm)

Circular Dimensions

Diameter
Diameter
1" (25.4 mm)
0.049" (1.24mm) [lb/ft]
0.497
0.065" (1.64mm) [lb/ft]
0.649
0.083" (2.11mm) [lb/ft]
0.095" (2.41mm) [lb/ft]
Diameter
Diameter
1.250" (31.8 mm)
0.049" (1.24mm) [lb/ft]
0.628
0.065" (1.64mm) [lb/ft]
0.822
0.083" (2.11mm) [lb/ft]
1.034
0.095" (2.41mm) [lb/ft]
1.172
Diameter
Diameter
1.500" (38.1 mm)
0.049" (1.24mm) [lb/ft]
0.759
0.065" (1.64mm) [lb/ft]
0.996
0.083" (2.11mm) [lb/ft]
1.256
0.095" (2.41mm) [lb/ft]
1.426
Diameter
Diameter
1.750" (44.5 mm)
0.049" (1.24mm) [lb/ft]
0.065" (1.64mm) [lb/ft]
1.170
0.083" (2.11mm) [lb/ft]
1.478
0.095" (2.41mm) [lb/ft]
1.679
Diameter
Diameter
2.000" (50.8 mm)
0.049" (1.24mm) [lb/ft]
0.065" (1.64mm) [lb/ft]
1.343
0.083" (2.11mm) [lb/ft]
1.699
0.095" (2.41mm) [lb/ft]
1.933

Mechanical Properties

Docol Tube R8

Yield strength Rp0.2 1)
(min ksi)
100
Tensile strength Rm 2)
(min ksi)
116
Elongation A 3)
(min %)
8

1) Yield strength 100 ksi = 690 MPa

2) Tensile strength 116 ksi = 800 MPa

3) Typical elongation value 10-12% (A50)

Chemical Composition (ladle analysis)

Docol Tube R8

C
(max %)
0.15
Si
(max %)
0.30
Mn
(max %)
1.70
P
(max %)
0.020
S
(max %)
0.010
Altot
(min %)
0.015
Cr
(max %)
0.105
Cr+Mo
(max %)
0.155

Tolerances

Tolerance Circular

Characteristic
Characteristic
Outside diameter (D) (1
1.000"≤ D < 1.125" (25.4 mm ≤ D < 31.8 mm)
1.125"≤ D ≤ 1.500" (31.8 mm ≤ D ≤ 38.1 mm)
1.500" < D ≤ 2.000" (38.1 mm < D ≤ 50.8 mm)
Circular precision tubes
Tolerances meet or exceed the requirements of EN 10305-3

±0.0059" (±0.15 mm)
±0.0079" (±0.20 mm)
±0.0098" (±0.25 mm)
Characteristic
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 ≤ 0.083" (2.11 mm): ±0.0059" (±0.15 mm)
T > 0.083" (2.11 mm): ±10%
Characteristic
Characteristic
Straightness
Circular precision tubes
Tolerances meet or exceed the requirements of EN 10305-3
Maximum 0.10% of measured length
Characteristic
Characteristic
Height of internal weld bead (g)
Circular precision tubes
Tolerances meet or exceed the requirements of EN 10305-3
D > 1.000" (25.4 mm): g ≤ 0.012" (0.3 mm)
D = 1.000" (25.4 mm): g ≤ 0.040" (1.0 mm)
Characteristic
Characteristic
Mill length
Circular precision tubes
Tolerances meet or exceed the requirements of EN 10305-3
0/+0.1641 ft (0/+50 mm)

1)For a maximum distance of 0.3281 ft (100 mm), the ends may, due to residual stresses, have diameters outside the tolerance

Coating and Surfaces

Surface designation and general usability

Designation
Designation
UC
Definition
Uncoated (cold rolled), T ≤ 0.083” (2.11 mm)
Usability
Suitable surface condition if painted or chromium plated
Designation
Designation
UC
Definition
Uncoated (hot rolled), T > 0.083” (2.11 mm)
Usability
Suitable surface condition if painted

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
UC, cold rolled
Ra value
< 0.6 μm
Designation
Designation
UC, hot rolled
Ra value
< 2.0 µm

Delivery Conditions

The tubes are not intended to undergo any heat treatment after welding and sizing as that may alter the mechanical properties of the material.

The tubes are oiled with anti-corrosive oil.

Fabrication and Other Recommendations

For information concerning fabrication, see SSAB´s brochures on www.ssab.com or consult Tech Support.

Appropriate health and safety precautions must be taken when bending, welding, cutting, grinding or otherwise working on the products.

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