The post-quenching treatment of forged and heat-treated components plays a critical role in defining the mechanical properties, fatigue life, and dimensional stability of the material. One of the most efficient systems for this purpose—especially for long, cylindrical or shaft-type components—is the pit type tempering furnace. Designed for vertical loading and uniform thermal cycling, it is an ideal solution for heat treating high-value forged components in industries such as automotive, aerospace, oil & gas, and railways.
As leading pit type furnace manufacturers in India, Maan Global Industries provides advanced vertical heat treatment solutions with highly controllable temperature cycles, excellent load accommodation, and minimal footprint, while ensuring compliance with industry standards like AMS 2750, ISO 9001, and IATF 16949.
What Is a Pit Type Tempering Furnace?
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A pit type tempering furnace is a vertical shaft furnace installed partially or completely below floor level. It is designed to heat previously hardened or quenched metal components to sub-critical temperatures—usually between 150°C to 700°C—for the purpose of relieving internal stresses, reducing brittleness, and improving ductility.
Why use a pit type design?
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Supports vertical loading of long or delicate components
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Occupies less floor space compared to horizontal designs
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Offers deep soaking and uniform heat distribution
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Enables crane or hoist loading for heavy parts
The pit type tempering furnace is ideally suited for applications involving:
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Forged shafts
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Crankshafts
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Gear blanks
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Alloy bars
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Couplings
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Heavy mandrels
Why Leading Companies Choose Pit Type Tempering Furnace Manufacturers in India
| Advantage | Description |
|---|---|
| Space-Efficient Layout | Installed below ground level to save factory floor space |
| Vertical Loading Compatibility | Handles long, cylindrical or symmetrical forged parts |
| Uniform Temperature Distribution | Electric or gas-fired design with zonal heating ensures even tempering |
| Automation-Ready Controls | Integrated PLC/PID system with SCADA compatibility |
| Energy Efficiency | Thick ceramic insulation and zone-wise control reduce heat loss |
| Repeatability | Accurate thermocouple feedback loop ensures cycle consistency |
Top pit type tempering furnace manufacturers in India like Maan Global Industries design systems optimized for repeatability, energy savings, and metallurgical precision.
Applications of Pit Type Tempering Furnace Across Industries
| Industry | Forged Components Processed | Furnace Use |
|---|---|---|
| Automotive | Crankshafts, camshafts, steering rods | Tempering after induction hardening |
| Oil & Gas | Shafts, couplings, pipeline components | Stress relief and tempering post-quench |
| Railways | Axles, brake rods, suspension components | Uniform tempering for fatigue strength |
| Aerospace | Alloy billets, landing gear shafts | Controlled cycle tempering |
| Forging Units | Tool steels, gear blanks, dies | Batch tempering of forged products |
For each of these industries, a well-designed pit type tempering furnace ensures that hardened components are tempered for toughness, resilience, and dimensional accuracy.
Technical Design of Pit Type Furnace
As one of the top tempering furnace manufacturers in India, Maan Global ensures every furnace is engineered with quality construction and precise control.
Furnace Shell & Insulation
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Outer Shell: Mild steel cylinder with ribbed stiffeners
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Inner Lining: High-density ceramic fiber or castable refractory
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Placement: Installed within a concrete-lined pit or shaft
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Cover: Swing-type or lift-up top cover with ceramic seal
Heating System Options
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Electric Models:
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Heating Elements: NiCr / Kanthal / MoSi₂
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Uniformity: ±3°C to ±5°C with air circulation fan (optional)
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Gas-Fired Models:
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Burners: High velocity modulating LPG/PNG burner
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Safety: Flame monitoring, overtemp protection, solenoid valve
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Loading Mechanism
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Vertical loading via crane or hoist
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Load baskets or fixtures used for shaft alignment
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Optional: Inner retort for controlled atmosphere
Tempering Furnace Manufacturer
Tempering Furnace for Forged Components
Tempering Process in Heat Treatment
Energy Efficient Furnaces for Manufacturing Industry
Technical Specifications – Pit Type Tempering Furnace
| Parameter | Specification Range |
|---|---|
| Furnace Depth | 1000 mm – 5000 mm |
| Chamber Diameter | 600 mm – 2500 mm |
| Load Capacity | 500 kg – 15,000 kg |
| Max Temperature | 700°C |
| Uniformity Accuracy | ±3°C to ±5°C |
| Heating Zones | 1–4 (vertical segmentation) |
| Power Load (Electric Models) | 20 kW – 250 kW |
| Fuel Rate (Gas Models) | 10 – 35 kg/hr (LPG) |
| Cycle Time | 2–8 hours (adjustable per material) |
| Cooling Method | In-chamber natural / forced air (optional) |
| Control System | PLC + HMI / Digital PID |
Every pit furnace is custom-built to align with your production volume, load geometry, and heat cycle characteristics.
Control & Safety Features
As reliable furnace manufacturers in India, we offer:
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PLC with multi-zone PID control
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Ramp-hold soak cycle programming
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Thermocouple feedback (3–6 points)
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Data logging with USB/SCADA
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Flame failure lockout (for gas models)
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Overtemperature cut-out and alarms
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Optional: IoT integration, temperature uniformity surveys
These control options ensure each batch of tempered components meets the metallurgical and regulatory benchmarks of critical industries.
Electric vs. Gas-Fired Pit Type Furnace – Comparison
| Feature | Electric Pit Furnace | Gas-Fired Pit Furnace |
|---|---|---|
| Heating Source | NiCr/Kanthal resistance coils | High velocity gas burner |
| Accuracy | High (±3°C with zonal control) | Moderate (±5°C with flame modulation) |
| Energy Efficiency | High in small–medium batch cycles | Best for large volume and heavy loads |
| Operating Cost | Higher per kWh | Lower with PNG/LPG |
| Maintenance | Minimal (heating coil replacement) | Burner tuning and gas train upkeep |
| Ideal For | Indoor, clean heat treatment | Foundry and forging environments |
The right system depends on load size, throughput, utility availability, and required thermal precision.
Case Study – Pit Type Tempering Furnace for Automotive Axles
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Client: OEM Tier-1 automotive supplier, Pune
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Component: Forged rear axle shafts (length: 2.2 m)
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Furnace Type: Electric pit type tempering furnace
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Capacity: 6 tons per cycle
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Temperature: 600°C with 4-hour soak
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Control: Siemens PLC, 4 thermocouples, SCADA
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Results:
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Improved tensile strength +23%
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Reduced internal stress cracks
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Consistency across batches confirmed with hardness profiles
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Why Choose Maan Global – Pit Type Tempering Furnace Manufacturers in India
We are among the top-rated tempering furnace manufacturers in India, offering:
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Furnace chamber customization to match load specs
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Electric, LPG, PNG, or hybrid firing options
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Fully integrated automation, SCADA, and IoT
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On-site installation, calibration, and test trials
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Cycle documentation and compliance for ISO, AMS, or ASME standards
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Pan-India and global project execution (Saudi Arabia, UAE, Kenya, Bangladesh)
Buy Pit Type Tempering Furnace for Long Forged Components Today
If you are in the forging, automotive, or precision manufacturing industry and require high-performance thermal systems, investing in a pit type tempering furnace is the ideal solution for space efficiency, vertical load handling, and accurate cycle control.
Contact Maan Global Industries – a trusted name among pit type tempering furnace manufacturers in India – for turnkey thermal solutions tailored to your production goals.
Email: mail@maanglobalindustries.com
WhatsApp: +91-8882490101
