Cut and bent tubes

Seamless steel tubes can be supplied as cut tubes and bent tubes. Processed are mostly precision cold drawn tubes. Upon the requirement hot-rolled tubes can be supplied in the form of semi-finished product. Cut tubes are designed especially for manufacturers of automotive components. Just in time supplies are possible and also to create buffer stocks.

Processing capabilities of precision seamless tubes

Cutting tubes to exact lengths
- sawing
- shearing
- rotary cut-off
Beveling tube ends
Tube bending

Equipment and methods of production

Process	Sawing	Sawing	Shearing	Rotary cut off
Range	Method 1	Method 2	Method 3	Method 4
Outside diameter	12 - 102 mm	10 - 81mm	15 - 152 mm	20 - 90 mm
Wall thickness	1 - 3 mm	0,5 - 6 mm	max. 7 % D	0,7 - 12 mm
Length of a tube	25 - 4500 mm	15 - 340 mm	25 - 780 mm	150 - 2000 mm
Tolerances of tubes	± 0,25 mm	± 0,025 mm	± 0,25 mm	± 0,11 - ± 0,19 mm
Stability of the manufacturing process		CpK > 1,67		CpK > 1,67
Tube ends	Passivating the ends at L = 100 - 4500 mm	Beveling tube ends
		D = 10 - 81 mm L = 15 - 340 mm 5° - 85° (min. d = 12 mm)	D = 15 - 70 mm L = 30 - 690 mm	D = 20 - 90 mm L = 150 - 2000 mm 5° - 85° (min. d = 18 mm)
Surface protection	Washing and passivation at L = 100 - 3000 mm	without protection or oiled

Packaging of cut tubes

Semi-finished products are delivered with respect to their dimensions and in agreement with the customer-packed in bundles, placed on metal pallets, folding box pallets or packed in cartons which are stored on wooden pallets.

Certificates for cut tubes

According to DIN 50049 - EN 10204 - 2.2 or 3.1.B.

 

 

Methods of producing cut tubes

Tube bending

The tubes are bent on CNC bending equipment with the possibility of bending in three levels with no distortion of the tube bend (see table).
Bend parameters:

- maximum dimension of bent tube	- 42 x 2,5 mm
- bending radius	- 12 – 260 mm
- maximum bending angle	- 187°
- tolerance of the banding angle	- ± 0,1°
- length of the tube up to the last bend	- max 3000 mm
- length tolerance	- 0,1 mm

Bend angle Rm

20

25

32

40

50

60

80

100

125

160

200

250

D = 10 t ≥ 1

D = 12 t ≥ 1

D = 14 t ≥ 1

D = 15 t ≥ 1

D = 16 t ≥ 1

D = 18 t ≥ 1

D = 20 t ≥ 1

D = 22 t ≥ 1

t = D / 20 Ri = 2D

D = 24 t ≥ 1

D = 25 t ≥ 1

t = D / 30 Ri = 3D

D = 28 t ≥ 1

D = 30 t ≥ 1,5

t = D / 50 Ri = 4,5D

D = 32 t ≥ 1,5

D = 35 t ≥ 1,5

D = 38 t ≥ 1,5

D = 40 t ≥ 1,5

D = 42 t ≥ 1,5