Roller Hearth Furnace for Carbon Steel Tubes and Bars

Pipes, bars and other semi-finished products made from carbon and low alloyed steel, including wire coils, are becoming increasingly important throughout 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. Other functions of our controlled atmosphere plants, especially for the treatment of carbon and low alloyed steel, include the creation of reducing conditions and/or carbon activity (the carburization or decarburization of the surface layer).

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 a essential element.