Induction for extruded special steel tubes
SMALL BATCH SIZES; HIGH-ALLOY MATERIALS
IAS has developed state-of-the-art induction plant concepts for seamless, high-alloy steel tubes that are manufactured using the extrusion method. This ensures key market requirements are fulfilled:
Even small batch sizes with varying geometries in special alloys can be profitably produced. What's impressive about these concepts from IAS is that they offer high cost efficiency, flexibility, energy efficiency, quick conversions and reliable process control.
INDUCTION PLUS GAS HEATING
With complex special steels the extrusion temperature must be kept within a very narrow range. To ensure this is the case, IAS has developed clever combinations of gas heating and induction furnace systems with high efficiency levels, with the result that the benefits of both types of heating, appropriately matched with the product range and extrusion technology, can really be felt. The following combinations have proven to be effective in practical applications:
■ Horizontal, inductive basic heating with vertical, inductive final heating
■ Gas-fired rotary-hearth furnaces with reduced atmosphere and vertical, inductive re-heating
■ With smaller billet dimensions up to 180 mm and when operating without a piercing press, horizontal inductive pre-heating systems are used
■ Gas pre-heating up to approximately 700 °C as well as vertical inductive intermediate heating and re-heating
UP TO 83 % EFFICIENCY
The use of a multi-zone induction heating coil for re-heating as well as the ability to make frequency adjustments and the options for infinitely variable power control using IGBT converters ensure the temperature can be reliably influenced relative to the process, and narrow temperature limits can be observed. Depending on the configuration, electrical efficiency levels of up to 81 % can be achieved, and even up to 83 % for titanium alloys.