May. 20, 2026
Share:Box-type tempering furnace is a batch-type industrial electric furnace primarily used for the tempering of alloy steel products and metal components, as well as for heat treatment processes such as solution treatment, annealing, and aging of light alloys like aluminum alloys. This equipment typically employs electric heating combined with a hot air circulation system to ensure uniform furnace temperature, making it an indispensable heat treatment device in the machinery manufacturing, aerospace, and automotive industries.
Main Functions and Applications
The core function of a box-type tempering furnace is to adjust the internal microstructure of metallic materials by precisely controlling heating temperatures and holding times, thereby improving their mechanical properties.
Primary Process Applications
Tempering: Used to reduce the hardness of steel after quenching, enhance toughness and ductility, and relieve internal stresses.
Solution Treatment and Aging: Suitable for solution treatment and artificial aging of light alloys such as aluminum alloys to enhance material strength.
Other Heat Treatments: Some models can also be used for annealing, normalizing, and other processes to meet diverse production needs.
Suitable Materials and Industries
Processed Materials: Widely applicable to alloy steel, carbon steel, stainless steel castings, ductile iron, and aluminum alloy die-castings, among others.
Application Fields: Primarily serves mechanical manufacturing, automotive parts production, aerospace component processing, and experimental testing at research institutes.
Precautions for Use
Brittle Temperature Range: For materials such as stainless steel, prolonged holding at temperatures between 600°C and 700°C may cause the precipitation of brittle phases, leading to reduced corrosion resistance and toughness; this range should be avoided when setting process parameters.
Deformation Control: Stress relief during the tempering process may cause dimensional changes in workpieces; for precision parts, allow for deformation or use fixtures for stabilization.
Equipment Structure and Operating Principle
The design of box-type tempering furnaces focuses on temperature uniformity and energy efficiency. Modern equipment typically employs all-fiber furnace linings and intelligent control systems.
Furnace Structure
Furnace Lining Material: An all-fiber structure (such as ceramic fiber modules) is used, typically with a thickness of up to 240 mm. Compared to traditional brick-lined furnaces, this design saves approximately 60% in energy consumption, while also featuring low heat storage and rapid heating.
Heating Elements: OCr21Al5 alloy resistance strips are commonly used, arranged in a corrugated pattern along the four sides and bottom of the furnace chamber to transfer heat via radiation and convection.
Sealing Design: The furnace door is operated by an electric hoist for lifting or features a side-opening compression mechanism. Some sealed furnace models are equipped with pneumatic cylinder-compression seals to prevent heat loss.
Temperature Control and Circulation System
Hot Air Circulation: A high-temperature-resistant fan is installed at the top of the furnace to agitate the air inside, creating forced convection and ensuring temperature uniformity within ±5°C.
Intelligent Control: Equipped with a PID self-tuning controller, it supports manual/automatic temperature control with an accuracy of ±1°C, and features over-temperature alarms, power limiting, and thermocouple compensation functions.
Safety Interlock: Automatically cuts off the main heating circuit when the furnace door is opened, preventing burns and protecting the heating elements.
Temperature Measurement System
Typically equipped with two thermocouples: one for real-time temperature measurement and the other for over-temperature alarms, providing dual assurance of temperature accuracy.
Some high-end models are equipped with a temperature recorder capable of printing real-time heating and holding curves, facilitating process traceability.
Common Technical Parameters and Selection Guide
Specifications vary among box-type tempering furnaces produced by different manufacturers; selection should be based on workpiece dimensions, production volume, and process temperature.
Typical Technical Parameters
Operating Temperature: Standard models have a maximum operating temperature of 650°C, while some high-temperature models can reach 700°C or higher.
Rated Voltage: Industrial models typically operate on 380V three-phase power, while small laboratory furnaces may support 220V single-phase power.
Power Range: Common rated power ranges from 60 kW to 90 kW, depending on the chamber size and loading capacity.
Chamber Dimensions: A wide variety of sizes are available, ranging from small furnaces (950 × 450 × 350 mm) to large furnaces (1800 × 900 × 550 mm).
Market Product Reference
There are various models of box-type tempering furnaces available on the market, with prices varying based on configuration, brand, and customization requirements. The following provides some market reference information:
Selection Recommendations
Energy Efficiency: Prioritize models with a full-fiber furnace lining structure, as they consume less energy during long-term operation.
Temperature Uniformity: If high temperature uniformity is required (e.g., within ±5°C), verify that the equipment is equipped with a forced hot air circulation system.
Safety: Check whether the unit is equipped with over-temperature protection, ground fault protection, and a furnace door interlock power-off function.
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