Name: China Customized Pit Type Annealing Furnace Manufacturers Suppliers Factory - Good Price - Fangwei
Brand: Fangwei
SKU: 316366607

Jiangsu Fangwei Furnace Industry Co., Ltd. is one of the leading manufacturers and suppliers of pit type annealing furnace in China. We have world-leading production equipment and strong manufacturing capabilities. Welcome to wholesale customized pit type annealing furnace made in China here from our factory. For price consultation, contact us.

Product Introduction

The Pit Type Annealing Furnace is designed for heat treatment of long, tall and heavy metal workpieces that are loaded vertically. Its pit-type structure allows parts to be positioned upright inside the chamber, which helps support long workpieces and reduce the risk of bending during heating. It is commonly used for shafts, bars, tubes, pipes, gears, rings and other large components that require vertical support during annealing.

During annealing, the heating and cooling cycle is controlled to relieve residual stress and obtain the required microstructure. The actual cycle parameters are adjusted according to the steel grade, section size and on-site annealing specification. Furnace diameter, depth, heating power, temperature zoning, fixtures and cooling systems can all be configured to match actual workpiece specifications and batch production needs.

Working Principle

Long shafts, bars or pipe sections are normally loaded vertically into the pit chamber using a crane. Depending on the furnace configuration, workpieces are fixed on base frames or dedicated fixtures to maintain stable positioning throughout the thermal process. The cover of Pit Type Annealing Furnace is fully closed and sealed before operation starts. Resistance heating elements run on pre-programmed temperature curves to complete staged heating and soaking processes.

Heat is transferred from the heating elements to the workpieces primarily through thermal radiation. Multiple thermocouples arranged across the hot zone continuously collect temperature data and feed signals to the PID control system. The controller adjusts heating output according to the temperature feedback to maintain the set temperature during soaking.

Once soaking is completed, the furnace executes a programmed cooling sequence. Workpieces can then be cooled slowly inside the chamber or under a controlled protective atmosphere, depending on the required annealing process.

Features

Vertical Loading Design:

The pit arrangement allows long workpieces to remain upright during heating, reducing the risk of bending caused by unsupported horizontal loading. It is well suited for extra-long shaft, pipe and bar workpieces that cannot be processed stably in horizontal furnaces.

Uniform Zoned Heating:

Heating zones can be arranged according to furnace depth and actual load distribution. Multi-zone control is available for tall workpieces where temperature differences along the furnace height need to be controlled.

Precision Programmable Control:

The control system supports independent setting of heating rate, soaking duration and cooling gradient. Heating rate, soaking time and cooling conditions can be set according to the material grade and specified annealing cycle.

Low Heat Loss Structure:

Multi-layer high-performance insulation and precision-matched sealing structures reduce heat loss during extended heating and soaking periods and help maintain a stable furnace temperature.

Heavy-Duty Construction:

The Pit Type Annealing Furnace structure is designed according to the maximum batch weight, lifting arrangement and loading method, allowing the equipment to withstand repeated heavy-load operation.

Flexible Loading Operation:

The furnace can be loaded and unloaded with the existing workshop crane, making it suitable for batch production of large workpieces.

Wide Process Adaptability:

Depending on the material and required metallurgical condition, the furnace can be configured for stress-relief, softening, full, spheroidizing and recrystallization annealing.

Customizable Configuration:

Furnace size, heating zoning and fixture styles can be tailored to match unique workpiece dimensions, batch volumes and on-site process requirements.

Technical Parameters

Model	Power(KW)	Number of phases	Voltage(V)	Temperature(℃)	Operating Dimensions (φXH)
RJ-40-9	40	3	380	≤950℃	Φ600×800
RJ-65-9	65	3	380	≤950℃	Φ600×1600
RJ-75-9	75	3	380	≤950℃	Φ600×2400
RJ-95-9	95	3	380	≤950℃	Φ800×2000
RJ-115-9	115	3	380	≤950℃	φ1500×1200
RJ-320-9	320	3	380	≤950℃	φ2000×1500
RJ-430-9	430	3	380	≤950℃	φ3500×1600
RJ-700-9	700	3	380	≤950℃	φ5000×1800

Applications

This Pit Type Annealing Furnace is widely applied in forging, casting, steel processing, automotive manufacturing, bearing production and heavy equipment industries. Depending on the material and production route, the furnace can be used for stress-relief annealing, full annealing, spheroidizing annealing, softening annealing and recrystallization annealing.

Typical processing objects include large shafts, steel bars, seamless pipes, gears, bearing rings, molds and forgings. It is especially suited for oversized parts that require vertical placement for stable thermal treatment. Furnace dimensions, heating zoning, fixtures, protective atmosphere and cooling logic can be adapted to field process conditions. Temperature recording and process data management can be added when required for production monitoring and batch records.