1. Roller Hearth Furnace for Nonferrous Tubes and Bars

Roller Hearth Furnace for Nonferrous Tubes and Bars

LOI Thermprocess, with its predecessors Matthias Ludwig and Nassheuer, has been building Continuous roller hearth furnace plants under protective gas atmosphere for tubes, bars, wire coils and semi-finished annealing goods for more than 60 years. Throughout the world, more than 350 LOI roller hearth furnace plants under protective gas atmosphere have been installed.

Non-ferrous metals are usually annealed at temperatures of up to 950 °C in a controlled protective gas atmosphere and in compliance with the well-proven high convection principle. The bright annealing combined with

  • stress relieving annealing
  • recrystallization annealing /soft annealing
  • homogenising
  • precipitation hardening

is the most essential heat treatment procedure.

Non-ferrous metals are usually annealed under nitrogen as a protective gas. Due to the particularly high affinity of some materials to oxygen, vacuum locks are used in the heat treatment. A pre-purging unit including the option of automatic docking can be integrated in case of hollow products (e.g. pipes) which are often delivered as coil. This pre-purging unit floods the inside of the profiles prior to their transport into the vacuum chamber. This step ensures that the material surface in the inner tube does not react with any possibly penetrated oxygen from the ambient air during the annealing process.

Thanks to a special atmospheric circulation and the controlled atmospheric flow, we guarantee a particularly homogeneous heating-up and minor temperature tolerances in the process.

  • Value for Money

    Value for Money

    • High reliability
    • Long durability
    • Customized design
    • Chainable design
  • Efficiency


    • Data reception from higher-level systems, e.g. ERP or MES
    • Process and capacity optimization
    • Consumption optimization and analysis
    • Easy production line integration
    • High efficiency heating systems
  • Safety


    • According to DIN EN 746
    • Safety analysis and risk assessment
    • Redundant Atmosphere Control System
    • Protective gas flow metering
    • Safety Flow Control
    • Furnace Pressure
    • Failsafe Design
    • Consistent with local requirements
  • Service


    • Low-wear
    • High reliability
    • Maintenance Assistance System
    • Alarm - Management via e-mail/sms/app
    • Remote maintenance
  • Reference


    • KME
    • Sundwiger Messingwerke
    • Diehl Metall
    • Wieland Werke
    • Alcatel
    • Baosteel
    • Guangdong Huahong
    • Guangdong Chigo
    • Guangdong Jingyi
    • Nissan Copper
    • Jinchuan Copper
    • Fujian Jinyi Copper
  • Environment


    • Recuperative burner system
    • Energy recovering systems, e.g. waste gas heat exchanger, high temperature cooling section with heat exchanger
  • Digitalization


    • Industry 4.0
    • DMC (Data Management Center)
    • Production data recording and analyse at everytime
    • Level 0, 1, 2 design by LOI
  • Technical Excellence

    Technical Excellence

    • Customized design
    • Customized programming and visualization
    • Different jet cooling systems
    • Arbitrary sub suppliers After sales service with know-how in modification and modernization
  • ContactContact PersonPositionLegal EntityDepartmentPhoneFaxE-mailAddress
    LOI Thermprocess GmbH
    +49 201 1891-1
    +49 201 1891-321

    Am Lichtbogen 29

    45141 Essen


Tubes and Bars