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loose plate flange aluminium AF.16
loose plate flange aluminium drilled acc. PN 16 similar to DIN EN 1092-1/02
Aluminum alloy flange
The aluminum alloy flanges are manufactured using the G-ALSi12 (Cu) casting process, which has
good mechanical properties as well as good corrosion resistance.
The alloy composition according to DIN 1725 Sheet 2 is as follows:
| Cu | Zn | Si | Fe | Ti | Ni | Mn | Mg | Pb | Sn | Al |
|---|---|---|---|---|---|---|---|---|---|---|
| 1,0% | 0,5% | 11-13,5 | 0,8% | 0,15% | 0,2% | 0,5% | 0,3% | 0,2% | 0,1% | Rest |
The mechanical properties at room temperature are as follows:
| Property | Unit | Value |
|---|---|---|
| 0,2 limit Rpo,2 | N/mm² | 90-120 |
| Tensile strength (p/B) | N/mm² | 160-240 |
| Fracture elongation A5 | % | 1 - 4 |
| Brinell hardness | HB 5/250 | 55-75 |
| Fatigue strength | N/mm² | 70-80 |
Since the thermal conductivity of light metal alloys is three to four times higher than that of
carbon steels and six to eight times higher that that of heat-resistant steels, a very fast
heat absorption and heat dissipation is possible so that the intrinsic temperature of a
aluminum alloy flange can be maintained below critical values even at high pipe
surface temperatures.
Mechanical properties at high temperatures (typical values):
| Property | 20° C | 50° C | 100° C | 200° C |
|---|---|---|---|---|
| 0,2 limit Rpo,2 | 90 N/mm² | 80 N/mm² | 70 N/mm² | 55 N/mm² |
| Tensile strength Rm | 190 N/mm² | 180 N/mm² | 160 N/mm² | 110 N/mm² |
| Fracture elongation A5 | 4% | 5% | 7% | 10% |
| Brinell hardness HB | 55 | 51 | 45 | 32 |
| Overview of Types |
|---|
| Type A: innerØ suitable for the paper and pulp industry |
| Type B: innerØ acc. to DIN 2642, suitable for pipes conforming to the old boiler pipe standard DIN 2448 |
| Type C: innerØ acc. to DIN 2642, suitable for pipes conforming to ISO recommendation R64/ DIN 2448 |
| Type D: innerØ acc. to DIN 2673, suitable for weld-neck collars conforming to old boiler pipe standard |
| Type E: innerØ acc. to DIN 8063, suitable for PVC-pipes with collar bushing |
For actual applications, it can be stated that aluminum alloy flanges manufactured with the
dimensions of the DIN PN-16 flange can be used at operating pressures of up to 6 bar and a flange
temperature of 150° C. At lower operating pressures, higher temperatures are permissible.
Detailed tests and many years of application experience have shown that,
in terms of the leakage behavior at the specified operating conditions, no
significant differences could be determined between steel and aluminum alloy
flanges.
The flanges are usually delivered with a bare metallic surface.
Flanges with this finish are installed in aluminum alloy, stainless steel, and plastic piping
because in a normal atmosphere, the natural casting skin (oxide layer) provides the flanges
with good corrosion protection.
In moist air, a thick layer of oxide consisting of two superimposed sublayers forms,
The almost pore-free base and barrier layer of amorphous aluminum oxide and a
porous, hydrated surface layer with a low crystalline content. On this surface layer,
it is possible for white deposits to form. The underlying barrier layer of the protective
oxide skin, with a pH value in the range between 4.5 and 8.0, is largely insoluble,
so that in most cases, flanges with bare metal surface can be installed.
Epoxy resin coating
The flanges are also available with electrostatically applied, cured epoxy resin coating.
Flanges with this coating may be desired due to the improved corrosion protection or
for aesthetic reasons.
The flanges coated with epoxy resin are degreased, blasted, and then cured with
the electrostatically applied powder. During transport, during installation of the pipes,
And when bolting the flanges, it must be ensured that no damage is caused
because otherwise penetration of the coating due to corrosion could be more prevalent.
extended product description
loose plate flanges aluminium-flanges PN 16
loose plate flange aluminium AF.16
Aluminum alloy flange
The aluminum alloy flanges are manufactured using the G-ALSi12 (Cu) casting process, which has
good mechanical properties as well as good corrosion resistance.
The alloy composition according to DIN 1725 Sheet 2 is as follows:
| Cu | Zn | Si | Fe | Ti | Ni | Mn | Mg | Pb | Sn | Al |
|---|---|---|---|---|---|---|---|---|---|---|
| 1,0% | 0,5% | 11-13,5 | 0,8% | 0,15% | 0,2% | 0,5% | 0,3% | 0,2% | 0,1% | Rest |
The mechanical properties at room temperature are as follows:
| Property | Unit | Value |
|---|---|---|
| 0,2 limit Rpo,2 | N/mm² | 90-120 |
| Tensile strength (p/B) | N/mm² | 160-240 |
| Fracture elongation A5 | % | 1 - 4 |
| Brinell hardness | HB 5/250 | 55-75 |
| Fatigue strength | N/mm² | 70-80 |
Since the thermal conductivity of light metal alloys is three to four times higher than that of
carbon steels and six to eight times higher that that of heat-resistant steels, a very fast
heat absorption and heat dissipation is possible so that the intrinsic temperature of a
aluminum alloy flange can be maintained below critical values even at high pipe
surface temperatures.
Mechanical properties at high temperatures (typical values):
| Property | 20° C | 50° C | 100° C | 200° C |
|---|---|---|---|---|
| 0,2 limit Rpo,2 | 90 N/mm² | 80 N/mm² | 70 N/mm² | 55 N/mm² |
| Tensile strength Rm | 190 N/mm² | 180 N/mm² | 160 N/mm² | 110 N/mm² |
| Fracture elongation A5 | 4% | 5% | 7% | 10% |
| Brinell hardness HB | 55 | 51 | 45 | 32 |
| Overview of Types |
|---|
| Type A: innerØ suitable for the paper and pulp industry |
| Type B: innerØ acc. to DIN 2642, suitable for pipes conforming to the old boiler pipe standard DIN 2448 |
| Type C: innerØ acc. to DIN 2642, suitable for pipes conforming to ISO recommendation R64/ DIN 2448 |
| Type D: innerØ acc. to DIN 2673, suitable for weld-neck collars conforming to old boiler pipe standard |
| Type E: innerØ acc. to DIN 8063, suitable for PVC-pipes with collar bushing |
For actual applications, it can be stated that aluminum alloy flanges manufactured with the
dimensions of the DIN PN-16 flange can be used at operating pressures of up to 6 bar and a flange
temperature of 150° C. At lower operating pressures, higher temperatures are permissible.
Detailed tests and many years of application experience have shown that,
in terms of the leakage behavior at the specified operating conditions, no
significant differences could be determined between steel and aluminum alloy
flanges.
The flanges are usually delivered with a bare metallic surface.
Flanges with this finish are installed in aluminum alloy, stainless steel, and plastic piping
because in a normal atmosphere, the natural casting skin (oxide layer) provides the flanges
with good corrosion protection.
In moist air, a thick layer of oxide consisting of two superimposed sublayers forms,
The almost pore-free base and barrier layer of amorphous aluminum oxide and a
porous, hydrated surface layer with a low crystalline content. On this surface layer,
it is possible for white deposits to form. The underlying barrier layer of the protective
oxide skin, with a pH value in the range between 4.5 and 8.0, is largely insoluble,
so that in most cases, flanges with bare metal surface can be installed.
Epoxy resin coating
The flanges are also available with electrostatically applied, cured epoxy resin coating.
Flanges with this coating may be desired due to the improved corrosion protection or
for aesthetic reasons.
The flanges coated with epoxy resin are degreased, blasted, and then cured with
the electrostatically applied powder. During transport, during installation of the pipes,
And when bolting the flanges, it must be ensured that no damage is caused
because otherwise penetration of the coating due to corrosion could be more prevalent.
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