Application > Reheating furnace

The reheating furnace is a fundamental component of many production processes for the manufacture of semi-finished material, including in the production of seamless pipe. After consistent heating of the blocks, the mandrel bar is introduced to a hollow block. The hollow block is then fixed in the flanging press and then pushed by multiple roller cages in an additional shaping stage on the push bench.  The diameter of the bloom produced in this manner is then enlarged so that the mandrel can be removed (detaching mill). In order to be able to guarantee the further processing, the bloom that has already cooled during the last processing stage is heated up again in the reheating furnace.  Then the bloom is stretched to the desired diameter in the stretch reducing mill and cut to the order length by the saw.

Proxitron infrared sensors and light barriers monitor and check this upstream production process at a number of positions, such as the roller conveyor, the cold saw, the rotary hearth furnace, the rotary forge mill, the flanging press, the push bench, the detaching mill, the hot saw, and the reheating furnaces, and thus assure a smooth and fault-free progression. The reheating furnaces are especially challenging due to the high temperatures that are prevalent there. 

Proxitron reflective light barriers of the type LRA and LRB with reflectors reliably monitor the loading and feeding of the reheating furnace with billet or bloom. The exact positioning takes place with the LMB optical distance measurement.

You can also get different types of one-way light barriers, reflective light barriers, photoelectric sensors, LMB optical distance measurement, and Piros infrared sensors from Proxitron, depending on the application and ambient temperatures. For extreme temperatures (up to 600 °C), you can choose between devices with optical fibre variants with a cooling housing (200 °C). An affordable variant in a durable stainless steel housing (75 °C) can be used for less extreme conditions.

The actuation temperature of Proxitron infrared sensors can be flexibly adapted to the temperature of the object from cold 250 °C to hot 900 °C. We offer optional air flushing in order to keep the lenses free from soot and scale.

Piros pyrometers and/or infrared thermometers from Proxitron can be exposed to ambient temperatures of up to 250 °C and detect or check the temperature of the material before and/or after discharge from the reheating furnace with a measuring range of up to 2500 °C.

Your benefit, your advantage

  • Maintenance-free

  • High availability

  • Extremely robust

  • Infrared sensors: Actuation temperature variable from 250°C - 900°C

  • Light barriers: extreme functional reserve

  • 35 years of application experience worldwide

  • Cost-optimised with scaling depending on the installation location

  • Provision of samples for a test period

  • Application consulting / analysis

More sensors for steel works

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