Roller Hearth Furnace for Wire

Pipes, bars and other semi-finished products including wire coils in steel and non-ferrous material, are becoming increasingly important throughout the industry.

Roller hearth furnace plants can be used to treat a very wide range of products which are used in all industrial sectors. Economical, energy-efficient heat treatment plants are essential to meet the growing requirements faced by materials, such as weight reduction without sacrificing strength and other properties in the automobile industry, and to produce large quantities of materials required throughout the world.

The heat treatment is an essential stage in the production and processing of pipes and bars made from carbon and low alloyed steel. This heat treatment is mainly carried out in roller hearth furnaces, which may either be electrically heated or gas-fired. The main heat treatment processes under protective gas atmosphere in a roller hearth furnace plant are bright annealing in combination with

• Stress relief
• Recrystallization
• Normalizing
• Tempering
• Spheroidizing
• Solution Annealing
• Subcritical Annealing
• Isothermal Annealing.

Tenova LOI roller hearth furnace plants with a protective controlled atmosphere are used to prevent unwanted reactions such as the oxidation or nitrification of the charge material in air or waste gas and therefore achieve the highest requirements.

The controlled atmospheres consist of neutral or inert constituents. However, they may contain reactive components for process reasons. The neutral or inert component is mainly nitrogen. The active or reactive components are mainly carbon monoxide combinations in which hydrogen is an essential element.