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PLANT DATA – HEAT TREATMENT

• Maximum temperature: 950 °C

Clear width: 2,200 mm
Usable width: 2,070 mm
Usable height: 400 mm
Working height: 1,300 mm
Infeed roller conveyor: 14,700 mm
Infeed box: 2,500 mm
Annealing furnace: 29,169 mm
(Annealing furnace clear length): approx. 26,769 mm
Cooling section (HT and LT): 51,000 mm
Discharge box: 2,500 mm
Discharge roller conveyor: 14,660 mm
Total length: 114,530 mm
Plant volume: XXX m³ (annealing furnace and cooling section)
N2 purge gas volume: 420 m³
Furnace type: Roller hearth continuous furnace
Material processed: Tubes
Outer diameter: 14 – 180 mm
Wall thickness: 0.8 – 8.0 mm
Length: 4.0 – 13.0 m
Surface before annealing: -

Throughput at 920 °C material temperature and full furnace utilization: 7,000 kg/h (without soak time)
Throughput at 700 °C material temperature and full furnace utilization: xxxxx kg/h (without soak time)
Reference tubes:
– 25 x 2.5 x 8,000 mm
– 33 x 3.5 x 8,000 mm
– 40 x 3.5 x 8,000 mm
– 55 x 2.8 x 8,000 mm
– 63 x 4 x 8,000 mm
– 75 x 6 x 8,000 mm
– 110 x 8 x 8,000 mm
Exit temperature of tubes, depending on tube surface: 125 – 150 °C
Roller pitch infeed roller conveyor: 620 mm
Roller pitch infeed box: 620 mm
Roller pitch annealing furnace: approx. 430 mm
Roller pitch cooling section: 500 mm
Roller pitch discharge box: 620 mm
Roller pitch discharge roller conveyor: 620 mm
Roller dimensions:
– Annealing furnace: 155.4 x 14 mm 1.4848/1.4832
Front section
– HD cooling section: 157.0 x 10 mm 1.4826 (7 pieces)
– Remaining cooling section: 133.0 x 4 mm St 37
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Maximum permissible roller hearth loading at 920 °C operating temperature and even load distribution: 350 kg/m
Furnace floor:
– Lightweight firebrick: 130 mm
– Insulating bricks: 130 mm
– Mineral fiber board: 50 mm
Side wall:
– Lightweight firebrick: 230 mm
– Mineral fiber board: 100 mm
Roof: Suspended ceiling bricks and ceramic fiber mat, 330 mm roof thickness
Ring bricks for roller pass-throughs made from fiber material
Number of control zones: 6 (gas-fired)
Operation of control zones:
– (gas-fired) ON/OFF, with surround control
– (electrically heated) ON/OFF, with thyristor control
Thermocouples: NiCr-Ni
Temperature recording range: 0 – 1,000 °C
Temperature control range: 0 – 999 °C
Operating temperature range: 450 – 950 °C
Maximum operating temperature: 950 °C
Throughput speed: 7.5 – 150 m/h

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