Aluminium Clad Sheet/Strip for Inner Diameter

Best aluminium clad sheet/strip manufacturer


Aluminium brazing material production

Complex assemblies can be turned into single unit by just one pass through a brazing furnace. Aluminium brazing facilitates the joining of parts with a near-eutectic Ai-Si filler alloy, the liquid temperature which is about 50 º C lower than that of the core. In serial heat exchanger production the filler alloy is supplied via a thin clad on a core alloy.

Compound Material

Aluminium brazing material is a sophisticated multi-layer compound consisting of a core alloy which provides the stength and life cycle requirements of the heat exchanger and a clad brazing filler. A one-sided protection layer can also be clad, in order to prevent water-side radiator corrosion.

During brazing, only the clad brazing alloy melts, while the core alloys remain solid. The design and the applied materials of the heat exchanger are adjusted to optimize the brazing result regarding the required post braze mechanical properties as well as the corrosion resistance.


Roll cladding

Today, two basic cladding techniques, roll bonding and cast cladding, have become established industrially. Roll cladding is a solid-state welding process, which is used to join similar and dissimilar aluminium alloys, and represents the primary method of manufacturing fuselage skin sheet for aircraft, bright products and brazing sheet for automotive applications. The cladding layers are attached to the core slab by welding and metallurgical bonding using hot rolling. The cast cladding technique is based on a conventional direct chill mould modified in order to allow multiple metal streams to be casted into one single ingot.

Cladding thickness


Signi's well established, roll bonding process guarantees tight cladding thickness tolerances, which are essential for ensuring stable brazing results. Rather thin clad layers of 5% can be manufactured, as well as brazing materials also with a cladding thickness of 20%.

1> Tolerance according to EN and ASTM.
2> Higher thickness on request.
3> Special dimensions, tolerances, and alloys on request.

The state-of-art slitting line also allows Signi Aluminium to meet the demand for ever-closer width tolerances for tube stock materials. Depending on the material thickness width tolerances from max. 0.05mm up to max 0.20mm can be ensured.
Clad Alloys

Dimensions   Strips Sheets Thickness 0.051mm--3.0mm 0.4mm--6.35mm Width 5mm--1600mm 500--1600mm Length   Max. 10000mm Edge quality Trimmed Trimmed and slit; sawn Inside diameter 305mm, 405mm, 505mm Paper core, Aluminium core,  without core.   Outside diameter Max. 1600mm without connect point   Cladding Cladding  One side; Both sides Cladding rate 5%, 7.5%, 10%, 13%, 15% (other clad percentages available upon request) Cladding tolerance Cladding thickness of 1.5%--<4%: +/-0.6 Cladding thickness of 4.0--6.0%: +/-1.0 Cladding thickness of 6.0--<=12.0%: +/-1.5 Cladding thickness of 12.0--20.0%: +/-2.0   Surface Quality Mill finish; for thickness 0.3--3.5mm, chemically degreased Marking Ink marking         Physical Property Data of Strip Material Alloy Temper Thickness (mm) Tolerance (mm) Clad Ratio (%) Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) min Application 3003 H14 0.08~0.12 ±0.005 None 150~200 ≥120 1 Evaporator fin and plate 3003  H26 0.3~0.35 ±0.015 None 190~220 ≥160 8 Glass mounting bracket material 3003 H14 0.06~0.1 ±0.005 None 150~200 ≥120 1 Radiator fin and plate 4343/3003/4343 H14 0.06~0.1 ±0.005 8~12 150~200 ≥120 1   4343/3003/4343 H14 0.08~0.12 ±0.005 8~12 150~200 ≥120 1 Parallel condenser fin 4343/3003/4343 H14 0.1~0.12 ±0.005 8~12 150~120 ≥120 1 Charge air cooler material 4045/3003/4045 H14 0.1~0.12 ±0.005 8~12 150~200 ≥120 1   1060 O 0.35~0.4 ±0.02 None 55~95 ≥15 25 Air cooling fin material for tubes 1100 O 0.35~0.4 ±0.02 None 75~105 ≥25 25   3003 O 0.2~0.3 ±0.01 None 100~150 ≥45 15 Aluminium for heating element 3003 H16 0.5~0.7 ±0.02 None 150~210 ≥120 1   4047 H18 0.05~0.1 ±0.005 None ≥200 ≥170 0.5   4047 O 0.4~0.5 ±0.02 None 80~140 ≥35 12 Welding wire 7072 H19 0.12~0.15 ±0.005 None 145~172 ≥15 0.5 Fin stock 4A13 H18 0.05~0.1 ±0.005 None ≥190 ≥16 0.5 Aluminium for heating element 4104 H18 0.05~0.1 ±0.005 None ≥220 ≥190 0.5   3003 (inner fin) O 0.2~0.3 ±0.007 None 100~150 ≥45 15 Oil cooler 6951(inner fin) O 0.2~0.3 ±0.007 None 115~165 ≥50 15   3003(external fin) H14 0.1~0.15 ±0.005 None 150~200 ≥120 1   3003(inner fin) O 0.2~0.3 ±0.007 None 100~150 ≥45 15 Engineering machinery 3003(inner fin) H12 0.2~0.3 ±0.007 None 120~160 ≥85 2   3003(external fin) H14 0.1~0.15 ±0.005 None 150~200 ≥120 1   Physical Property Data of Plate Material 4343/3003 O 1.2~3.0 ±0.03 5~10 100~150 ≥45 25 Radiator fin and plate 4343/3003/7072 O 1.2~3.0 ±0.03 5~10 100~150 ≥45 25   4343/3003/4343 O 0.4~0.5 ±0.02 8~12 100~150 ≥45 27 Evaporator fin and plate 4045/3003/4045 O 0.8~1.2 ±0.03 8~12 100~150 ≥45 27   4045/3003/4045 O 2~3 ±0.05 8~12 100~150 ≥45 25 Charge air cooler material 4045/3003/4045 O 0.5~0.8 ±0.02 15~20 10~15 100~150 ≥45 25 Oil cooler 4104/3003/4104 O 0.5~0.8 ±0.02 15~20 10~15 100~150 ≥45 25   4104/3003/4104 H14 0.6~0.8, 1.2~1.5 ±0.02 ±0.03 13~17 8~12 150~200 ≥120 3 Engineering Machinery 4004/3003/4004 H14 0.6~0.8, 1.2~1.5 ±0.02 ±0.03 13~17 8~12 150~200 ≥120 3