When tempering vertical shafts, long gears, large castings, or bulk forgings, achieving a uniform heat profile across a deeply stacked load is the only way to guarantee consistent structural toughness. Our Pit-Type Tempering Furnace is specifically designed with a deep vertical chamber and an integrated high-volume forced air recirculation system that drives heated air evenly through the dense load. For automotive and mechanical part manufacturers, maintaining tight hardness tolerances across a large batch is essential to avoid weak spots; using our Pit-Type Tempering Furnace, our clients regularly achieve outstanding temperature uniformity of ±3°C, ensuring that every tempered component meets the required hardness and ductility.
With 24 years of expertise in industrial furnace engineering, we have designed the Pit-Type Tempering Furnace to minimize energy waste and simplify operation. The furnace chamber is lined with high-density, low-thermal-conductivity ceramic fiber modules, which prevent external heat radiation and reduce power consumption by up to 20% compared to standard brick-lined furnaces. Having successfully manufactured and delivered over 1,000 thermal systems globally, including specialized lines for BYD and Midea, we build our vertical furnaces to withstand heavy industrial environments. The robust cover lifting mechanism and durable heating element assemblies are engineered to perform reliably through thousands of heating cycles, safeguarding your production lines from unexpected downtime.
| Max Operating Temperature | 650°C |
| Temperature Uniformity | ±3°C (controlled by forced air circulation) |
| Chamber Depth Range | 1000 mm to 5000 mm (customizable) |
| Heating Element Configuration | Multi-zone spiral resistance wire mounted on ceramic tubes |
| Control Panel | Siemens PLC with touchscreen HMI and PID temperature control |
Application Fields
Shaft & Rod Tempering
Tempering and stress relieving of long vertical steel shafts, rods, and heavy fasteners.
Heavy Forgings & Castings
Stress-relief heat treatment for heavy forged steel blocks and large industrial castings.
Spring & Wire Tempering
Batch tempering of high-tensile springs and wire coils to restore elasticity.
In-House Quality Testing
We strictly follow ISO9001 quality management procedures. Every Pit-Type Tempering Furnace is completely assembled and undergoes a multi-zone thermal profiling and air-circulation test at our factory to verify temperature uniformity before shipping. We inspect all structural welds and electrical components under simulated load conditions, welcoming third-party inspectors to review and approve the equipment.
Global After-Sales Network
Every equipment purchase is backed by our comprehensive 1-year warranty and lifelong technical support. Our customer support team is available to assist with operations, and we can quickly dispatch our experienced field technicians to your factory for installation, testing, and operator training. We maintain a large inventory of spare parts, such as circulating fans and heating elements, to ensure quick dispatch when required.
FAQ
Q: Can this tempering furnace be used with protective atmospheres?
A: Yes, we can equip the furnace with an airtight inner retort and nitrogen/argon gas inlet ports to prevent surface oxidation of parts during the tempering process.
Q: How does the cover open, and is it automated?
A: We offer both pneumatic and hydraulic cover-lifting mechanisms. The cover rises vertically and swings aside, which can be operated manually or integrated into the automatic PLC cycle.
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