MAHLER Roller Hearth Furnaces – Precision Heat Treatment for Tubes, Bars, and Components

MAHLER roller hearth furnaces set the benchmark for bright annealing of stainless steel long products. Our continuous furnace systems are designed to perform demanding heat treatment processes with fully reproducible results, high energy efficiency, and complete process control. As continuous furnaces, they are ideally suited for the annealing of long products made from carbon and low-alloy steels.

Powerful, Compact, Efficient – Roller Hearth Furnaces by MAHLER

Our roller hearth furnaces enable annealing processes up to 1,050°C and, thanks to their modular design, offer maximum flexibility in terms of length, capacity, and furnace atmosphere configuration.

They offer:

Temperature & Process Capabilities

• Heat treatment up to 1,050°C for carbon and low-alloy steels
• Internal or external generation of protective and reaction gases (see also our protective gas generators)
• Ideal for virtually all annealing processes under protective or reaction gas atmospheres

Capacities & Dimensions

• High throughput capacities from 1,000 to 7,000 kg/h (higher capacities available on request)
• Custom furnace widths tailored to specific process requirements
• Individually configurable furnace lengths and zone layouts
• Optimized protective gas distribution and control for the desired surface quality

Process Benefits

• Uniform temperature distribution through optimized heating zones
• High reproducibility and consistently stable product quality
• High throughput performance

Heating Technologies – Efficient, Low-Emission, Future-Proof

MAHLER integrates state-of-the-art heating systems to achieve maximum energy efficiency and minimal emissions.

Heating Options

• Electric heating, either direct or indirect via radiant tubes
• Gas-fired heating using natural gas, propane, synthetic gases, or regenerative gases
• Hydrogen-ready operation with up to 100% H₂ as fuel gas
• Hybrid solutions, for example gas-fired heating combined with electric holding zones

Atmosphere Control – Protective Gas Processing for Outstanding Surface Quality

Our roller hearth furnaces support all common protective and reaction gas atmospheres:

• Precise atmosphere control, including process-safe neutral decarburization conditions
• Operation with process atmospheres containing up to 100% hydrogen, ensuring safe, efficient, and future-focused production
• Forming gas (N₂/H₂ mixtures)
• Cracked ammonia atmosphere
• Supply of mono-, exo-, and endothermic gases, generated internally or supplied externally, including via high-performance MAHLER gas generators

The gas management system is designed for minimum consumption, high purity, and stable process conditions.

Automation & Electrical Engineering – Complete Control of Every Process

MAHLER roller hearth furnaces feature modern, fully integrated automation and visualization technology that ensures safe, reproducible, and energy-efficient process control. The modular control architecture provides a clear structure for all functions, from temperature regulation and atmosphere control to energy and gas consumption monitoring.

All relevant process data is continuously recorded, visualized, and made available for analysis and documentation purposes. This enables operators and quality assurance teams to maintain complete visibility of the ongoing process at all times.

Your Benefits

• Intuitive, touch-optimized operator interfaces
• Clear visualization of all process conditions and material flows
• Comprehensive data logging, trend analysis, and archiving
• Precise alarm and fault messages in the preferred operator language
• Flexible interfaces for data export, remote access, and customer-specific IT integration
• Future-proof, modular software architecture that can be expanded as requirements evolve

Upon request, our systems can be configured to support the requirements of common heat treatment standards such as CQI-9 and AMS 2750. This includes enhanced documentation capabilities, defined temperature monitoring and calibration concepts, as well as structured process data acquisition for audit-compliant traceability.

Through this combination of transparency, ease of operation, and standards-oriented design, you retain complete control over your heat treatment process at all times, regardless of furnace age, production volume, or atmosphere used.

MAHLER Roller Hearth Furnaces – The Ideal Solution For

• Carbon and low-alloy steels
• Neutral annealing without decarburization
• Tubes, bars, profiles, and many other long products
• High-throughput production environments
• Applications with demanding requirements for surface quality and process reproducibility