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

Docol Tube R8 is available in circular shape.

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

Shapes

Circular (in)

Dimensions

1 - 2¹⁾

Shapes

Wall thickness (in)

Dimensions

0.049 - 0.095 ²⁾

Shapes

Mill length (ft)

Dimensions

19 ³⁾

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

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

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

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

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

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

	Yield strength R_p0.2¹⁾ (min ksi)	Tensile strength R_m²⁾ (min ksi)	Elongation A³⁾ (min %)
Docol Tube R8	100	116	8

Docol Tube R8

Yield strength R_p0.2¹⁾
(min ksi)

100

Tensile strength R_m ²⁾
(min ksi)

116

Elongation A³⁾
(min %)

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)

	C (max %)	Si (max %)	Mn (max %)	P (max %)	S (max %)	Al_tot (min %)	Cr (max %)	Cr+Mo (max %)
Docol Tube R8	0.15	0.30	1.70	0.020	0.010	0.015	0.105	0.155

Docol Tube R8

C
(max %)

0.15

Si
(max %)

0.30

Mn
(max %)

1.70

P
(max %)

0.020

S
(max %)

0.010

Al_tot
(min %)

0.015

Cr
(max %)

0.105

Cr+Mo
(max %)

0.155

Tolerances

Tolerance Circular

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

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)