Aluminum alloy extruded tubes for high-frenquency electric transformer

Split-flow die extrusion
The split-flow die extrusion method adopts a special extrusion die, and produces aluminum and aluminum alloy pipes on the ordinary extruder by means of normal extrusion of solid ingot. When extruding, the metal ingots are installed in the extrusion container, and under the action of the extrusion roll shaft, the filling and extrusion are performed firstly, forcing the metal to flow through the die holes to obtain the required pipes.
Aluminum alloy extruded tubes are produced by split-flow die extrusion ,and they shall be used in the transmission, transformation, distribution etc fields.
Chalco Aluminum has Aluminum alloy 6101B with temper T7 extruded tubes for high-frenquency electric transformer.With Outer Diameter 78-250mm,Wall Thickness 5.00- 35.00mm and Length 1000- 12000mm

1)Alloy ,temper and specification of Aluminum alloy extruded tubes for high-frenquency electric transformer

Alloy	Temper	Specification(mm)
6101B	T7	Outer Diameter	Wall Thickness	Length
		78.0-250.0	5.00- 35.00	1000- 12000

2)The chemical component of Aluminum alloy extruded tubes for high-frenquency electric transformer

Alloy

Chemical component(%)

Si

Fe

Cu

Mn

Mg

Cr

Zn

Ti

Zr

Other

Al

Each

Total

6101B

0.30-0.6

0.10-0.30

≤0.05

≤0.05

0.35-0.6

-

≤0.10

-

-

－

≤0.03

≤0.10

Remain

3) Dimensional deviation
3-1)Sectional dimension deviation
Tubes Sectional dimension deviation (unit:mm)

Nominal outside diameter(or Inner diameter)	Sectional dimension deviation
	Any point of outside diameter and nominal outer diameter deviation		Any point of inner diameter and nominal inner diameter deviation
	Plus deviation	Minus deviation	Plus deviation	Minus deviation
≤ 80.0	+1.0	0	0	-1.0
＞80.0-180.0	+1.5	0	0	-1.5
＞180.0-250.0	+2.0	0	0	-2.0

3-2)Length deviation
The length deviation of Cut length tubes is 0 +20mm ,The length deviation of Double length should left 5mm remainder for cutting.
3-3)Cutting slant angle
The Cutting slant angle of aluminium tubes should not over 10mm

3-4)Bending
Bending Deviation (unit:mm)

Nominal outside diameter	Ordinary Level		High precision level
	The length of each meter	Full length(L meter)	The length of each meter	Full length(L meter)
78.0- 150.0	1.5	1.5 x L	1.0	0.8 x L
＞150.0-250.0	2.5	2.5 x L	1.5	1.0 x L

4) Mechanical Property

Alloy	Temper	Wall thickness/mm	Mechanical Property				BH(Brinell Hardness) HBW
			Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)
					A	A50mm
			Not less than
6101B	T7	≤35.00	170	120	12	10	60