QED to deliver custom muffle tube furnace for spring wire processing in China

A new custom-engineered muffle tube furnace by QED is scheduled for shipment to China at the end of the month. Designed for the heat treatment of spring wire, the system performs austenitizing and annealing in a controlled atmosphere prior to downstream forming operations.

Below is an overview of the plant layout, key process features, and operating principles.

Overview of QED muffle tube furnaces

A new custom-engineered muffle tube furnace by QED is scheduled for shipment to China at the end of the month. Designed for the heat treatment of spring wire, the system performs austenitizing and annealing in a controlled atmosphere prior to downstream forming operations. Below is an overview of the plant layout, key process features, and operating principles.

QED muffle tube furnaces are engineered to austenitize or anneal multiple wire strands in a protective atmosphere, minimizing scale formation during heat treatment. In spring wire production, preserving surface quality at this stage is critical before subsequent forming operations.

In this installation, the wires travel longitudinally through individual muffle tubes operating under controlled atmosphere conditions. Each tube is supplied with inert gas through dedicated flow meters, ensuring precise atmosphere control and consistent, repeatable processing parameters.

The muffle tubes are manufactured from high-temperature alloy stainless steel and are supported above the refractory hearth, providing structural integrity and long service life under continuous thermal exposure.

Heating configuration and key advantages

Heat is generated by high-velocity burners arranged in a staggered configuration along both sides of the furnace. The burners fire above and below the muffle tube field, promoting efficient heat transfer by radiation, convection, and conduction. This configuration supports uniform temperature distribution across all processed strands.

Burner operation is managed by QED’s patented Pressure Control System, which regulates combustion parameters and contributes to stable thermal cycles. Each burner is equipped with individual flame safety monitoring and push-button ignition. The system can operate on gas, oil or dual fuel, depending on plant requirements.

For hardening applications, the furnace can be integrated with an oil quench system featuring targeted and adjustable flow patterns. This enables the cooling phase to be configured according to wire diameter and steel grade specifications.

To improve thermal efficiency, the furnace incorporates multiple layers of high-performance refractory. This design reduces outer shell temperature, enhances operator safety and limits heat loss during operation.

Key features at a glance

• Protective atmosphere processing with individual tube control
• High-temperature alloy stainless steel muffle tubes
• Staggered high-velocity burners firing above and below the tube field
• Patented Pressure Control System for combustion stability
• Individual burner flame safety monitoring and push-button ignition
• Gas, oil, or dual fuel capability
• Integrated oil quench and thermal efficiency

Further information are available at this link >>

From the workshop to the customer’s facility

As the furnace prepares to leave the workshop for China, QED confirms its experience in delivering purpose-built heat treatment systems for wire applications. The company focuses on engineered controlled atmosphere solutions tailored to specific production requirements, ensuring stable thermal cycles and reliable long-term operation.

For further information on QED’s custom muffle tube furnaces or to submit a technical inquiry for wire heat treatment applications, contact the company directly.

QED is a custom furnace manufacturer and engineering company specializing in process lines for the steel wire industry, including heat treatment, cleaning and coating systems. Its portfolio ranges from muffle and direct-fired furnaces to galvanizing and pickling lines, all engineered for heavy-duty operation and production reliability. QED solutions support austenitizing, annealing, tempering and other critical wire processing applications.