Multi-Stack Bell-type Annealing Furnace (MBAF) for Silicon Steel Strip
Tenova LOI Thermprocess, with its predecessors Matthias Ludwig and Nassheuer, has been building bell-type annealing plants for more than 60 years. Throughout the world, more than 500 LOI multi-stack annealing bases have been installed. The world-wide market share during the past 10 years is virtually 100%.
In the production of grain-oriented electrical strip, the material is annealed at about 1,200 °C following decarburizing and coating to obtain defined grain growth and a specified surface layer on the electrical strip.
In contrast to their widespread use for carbon steel and stainless steel, single-stack bell-type annealing furnaces have not become as established solution for the annealing of grain-oriented electrical steel sheet. Most of the new plants constructed for these applications over the past 20 years have therefore been multi-stack bell-type annealing furnaces (MBAF).
Normally three or four individual charge stations are installed in a row under the heating hood. Small coils (usually ≤ 12 t) are often charged in two layers. In other words, two coils may be stacked on each other on self-supporting plates.
Larger coils (usually ≥ 12 t) are charged in one layer on a charge plate manufactured from a high-temperature-resistant alloy or positioned directly on the base.Throughout the world, it has become normal practice to install electrically heated MBAF-plants. Multi-stack plants for two-layer operation have already been constructed with gas firing system with significant lower operating costs.
General Manager Sales Bell-type Annealing Furnaces, Tenova LOI Thermprocess
Director Sales, Tenova Technologies Pvt. Ltd.
Director of Sales Tenova LOI Thermprocess, Tenova Technologies (Tianjin)
Vice President Sales and Technology, Tenova Inc.
Senior Vice President Sales & Marketing, Tenova LOI Thermprocess
Modernization, Service & Spare Parts
Head of Revamp & Modernization, Tenova LOI Thermprocess