Pit Type Heat Treatment Furnace

Vertical Pit Type Heat Treatment Furnace

COOLDO Vertical pit type resistance heat treatment furnace is cycle production furnace. We have the RJ seriese and RQ series. The furnace used for heating treatment the metal parts not only can in natural atmosphere but also can in protective atmosphere. and The furnaces are mainly service for bright anealing and tempering various kinds of standard parts , carbon steel, alloy steel parts and magnetic materials, bright anealing of small batch of scrolling strips.


Diameter of Body: 500-4500mm
Temperature: 650 and 950 degree
Melting Method: Gas/fuel/electric.
Chamber: Muffle tank for atmosphere protection

Vertical Pit Type Annealing Furnace Description:


pit-type-resistance-heat-treatment-furnaceAlmost pit type furnace are round type and installed in the pit for easy loading and un-loading the goods, which consist of furnace body, cover, heating element, loading basket, and temperature control system.

Parts Description:
1), Body Shell: Made by steel plate and structural steel.
2), Inside of  furnace cover: made by stainless steel plate.
3), Burner liner: Adopt the super light and energy conservation micropore fire-resistant heat reserving brick
4), Aluminum silicate fiber at between burner liner and shell, and also fill full of thermo-insulating power in gap.
5), Resistance wire: Adopt  the 0Cr25Al5 high resistor alloy wire installed upon brick.
6), Furnace cover: Adopt the manual lever lifter or motor-driven or hydraulic.
7), Furnace installed fan: Made by a heat-resistance stainless steel shaft and fan blade  for uniform heating the work-piece
8), Limit switch:  Installed near the furnace cover for safety operation.

RJ Serise Pit Type Resistance Furnace


Item  Power 
Phase Voltage
Zone size
RJ2-25-6 Furnace 25 3 380 650 Ø400×500 400
RJ2-35-6 Furnace 35 3 380 650 Ø500×650 500
RJ2-55-6 Furnace 55 3 380 650 Ø700×900 750
RJ2-75-6 Furnace 75 3 380 650 Ø950×1200 1000

RQ Serise Pit Type Resistance Furnace


Item  Power 
Phase Voltage
Zone size
RQ3-25-9 Furnace 25 3 380 950 Ø300×450 50
RQ3-35-9 Furnace 35 3 380 950 Ø300×600 100
RQ3-60-9 Furnace 60 3 380 950 Ø450×600 150
RQ3-75-9 Furnace 75 3 380 950 Ø450×900 220
RQ3-90-9 Furnace 90 3 380 950 Ø600×900 400
RQ3-135-9 Furnace 135 3 380 950 Ø600×1200 500

Vertical Pit Type Resistance Tempering Heat Treatment Furnace on site:



Feature of Vertical Pit Type Resistance Hardening Treatment Furnace:

1), Stronger structure and small temperature difference in working zone,
2), Adopt the energy-saving furnace lining which can make fast temperature rising but saving more than 20% of energy compare with old product.
3),  Large fan installed and multiple heating zone controling for improving the temperature uniformity.
4), The control system can be equipped with normal control instrument or instrument with micro-processor program control according to actual need.
5), The Protective atmosphere can be special fed into the furnace to realize little-oxidizing heating if your need
6), Each product is installed with safety interlock and over-temperature device to provide reliable and safe operation and use.

Applciation of Vertical Pit Type Metal Hardening Process Furnace:  For bright anealing tempering of carbon steel, alloy steel parts and magnetic materials in protective atmosphere, and for bright anealing of small batch of scrolling strips


Video of Vertical Pit type Resistance Tempering Heat Treatment Furnace Video:


pit type furnace vedio