Precision Gas Carburizing Furnace in Pune for Case Hardening Applications
High-performance gas carburizing furnaces designed for accurate case hardening, uniform carbon diffusion, and long-term industrial reliability.
Pit Type Furnace
Usual Temperature - up to 1000* C
Capacity – From 50 kg to 5000 kg, Size is customizable as per job sizes.
Heat Source – Electric, Gas & Oil
Can also provide with Programmable operating through PlC, hmi, Scada.
Loading – Vertically Hanging
Why Pit Type?
- Zero Bending: By hanging a long shaft vertically, gravity acts as a stabilizing force, keeping the part perfectly straight.
- Uniform Quenching: When you lift a hanging job out of a Pit furnace and drop it into a quench tank, the fluid hits all sides simultaneously, reducing the risk of "banana" warping.
Advantages :
Distortion Control
Vertical loading uses gravity to keep long, heavy parts (like shafts) straight, minimizing warping.
Deep Case Depth
Pit furnaces excel at long “soak” times required for extra thick hardened layers (3mm or more).
High Volume/Size
Capable of handling massive industrial components that
wouldn’t fit in standard horizontal batch furnaces.
Uniformity
Powerful internal fans ensure the atmosphere and temperature are identical at the top and bottom of the pit.
Space Efficiency
Since the furnace body is underground, it requires less
overhead clearance and floor space.
Application :
Power Generation
Vertical loading uses gravity to keep long, heavy parts (like shafts) straight, minimizing warping.
Automotive & Transport
Heavy-duty drive shafts, axles, and transmission
gears for trucks and trains.
Mining & Construction
Drill bits, rock crushers, and earth-moving equipment
pins.
Aerospace
High-strength fasteners and landing gear components.
Industrial Machinery
Large-diameter roller bearings and bushings.
Process in short
Cleaning: Parts are degreased to ensure uniform carbon absorption.
Loading: Components are suspended vertically or stacked in baskets and
lowered into the furnace.
Heating: The furnace is sealed and heated to the austenitizing range (900°C
950°C).
Carburizing: A carbon-rich gas (like propane or methanol) is injected; carbon atoms diffuse into the steel surface.
Diffusion: The gas flow is adjusted to allow surface carbon to migrate deeper,
creating a uniform case.
Quenching: Parts are rapidly cooled in oil to harden the carbon-enriched
surface.
Tempering: Reheating at a low temperature to reduce brittleness while
maintaining hardness.
Purpose :
The primary goal is to create a “dual-property” metal :
Surface Hardness: To create a high-carbon martensitic surface that resists wear, abrasion, and contact fatigue.
Core Toughness: To maintain a lower-carbon, ductile interior that can absorb
heavy impacts and shocks without snapping.
Advantages :
Distortion Control
Vertical loading uses gravity to keep long, heavy parts (like shafts) straight, minimizing warping.
Deep Case Depth
Pit furnaces excel at long “soak” times required for extra thick hardened layers (3mm or more).
High Volume/Size
Capable of handling massive industrial components that
wouldn’t fit in standard horizontal batch furnaces.
Uniformity
Powerful internal fans ensure the atmosphere and temperature are identical at the top and bottom of the pit.
Space Efficiency
Since the furnace body is underground, it requires less
overhead clearance and floor space.
Application :
Power Generation
Vertical loading uses gravity to keep long, heavy parts (like shafts) straight, minimizing warping.
Automotive & Transport
Heavy-duty drive shafts, axles, and transmission
gears for trucks and trains.
Mining & Construction
Drill bits, rock crushers, and earth-moving equipment
pins.
Aerospace
High-strength fasteners and landing gear components.
Industrial Machinery
Large-diameter roller bearings and bushings.
