High Pressure Vacuum Gas Quenching Furnace

The Rexin High Pressure Vacuum Gas Quenching Furnace is a single-chamber horizontal vacuum heat treatment system designed for controlled heating and high-pressure nitrogen gas quenching of industrial metal components.

The furnace integrates a water-cooled vacuum vessel, graphite heating chamber, vacuum pumping system, high-pressure gas circulation system, heat exchanger, and PLC-based process control.

During operation, workpieces are heated under controlled vacuum conditions and subsequently cooled by circulating high-pressure nitrogen gas within the furnace chamber.

This reference configuration is designed with a 900 × 600 × 600 mm effective working zone and a maximum loading capacity of 600 kg. The furnace supports a maximum heating temperature of 1320°C and nitrogen gas quenching pressure up to 10 bar absolute.

Rexin provides customized vacuum gas quenching furnace solutions according to workpiece materials, dimensions, loading capacity, and required heat treatment processes.

The Rexin High Pressure Vacuum Gas Quenching Furnace is designed for industrial vacuum heat treatment of metal components, particularly high-pressure gas quenching applications requiring controlled heating and cooling.

Applicable Materials

• High-Alloy Tool Steel – For vacuum hardening and high-pressure gas quenching.

• High-Speed Steel (HSS) – For vacuum heat treatment and gas quenching.

• Stainless Steel – For suitable vacuum heat treatment and gas quenching processes, depending on the steel grade.

• High-Temperature Alloys and Magnetic Materials – For applicable vacuum annealing processes, subject to process evaluation.

Typical Workpieces

Depending on material grade, geometry, and heat treatment requirements, potential workpieces include:

• Tool steel components

• High-speed steel cutting tools

• Dies and mold components

• Precision machined metal parts

• Stainless steel industrial components

Heat Treatment Applications

The primary application is vacuum heating followed by high-pressure nitrogen gas quenching.

Other processes, such as vacuum annealing, vacuum sintering, and vacuum brazing, may be evaluated according to the selected furnace configuration and specific process requirements.

Rexin can review customers' workpiece drawings, material specifications, loading requirements, and target heat treatment results to recommend a suitable furnace configuration.

The Rexin High Pressure Vacuum Gas Quenching Furnace features a horizontal single-chamber structure with a double-wall water-cooled furnace vessel.

Furnace Construction

• Double-wall water-cooled steel furnace body

• Side-opening furnace door with pneumatic locking mechanism

• Graphite-based heating chamber and thermal insulation

• Graphite workpiece support structure

Heating System

• Graphite tube heating elements arranged around the heating chamber

• 360° radiant heating arrangement

• Reference heating power: 160 kW

• Maximum heating temperature: 1320°C

• Operating temperature range: 150–1300°C

The graphite heating chamber is designed to provide controlled radiant heating under vacuum conditions. The final furnace structure and heating configuration can be adapted to specific workpiece and process requirements.

The Rexin High Pressure Vacuum Gas Quenching Furnace uses high-pressure nitrogen gas circulation to cool workpieces after vacuum heating.

Gas Quenching System Components

• High-pressure nitrogen gas supply and distribution system

• High-power gas circulation fan

• Gas cooling heat exchanger

• Gas flow channels within the furnace chamber

• Variable-frequency fan speed control

Reference Operating Parameters

• Maximum quenching pressure: 10 bar absolute

• Quenching medium: Nitrogen (N₂)

• Required nitrogen purity: 99.999%

• Reference cooling fan power: 200 kW

During the quenching stage, nitrogen circulates through the furnace chamber and heat exchanger to remove heat from the workpieces.

The cooling process can be adjusted according to the material grade, workpiece dimensions, loading arrangement, and heat treatment requirements.

Final cooling performance and achievable hardness depend on the workpiece material and the confirmed process conditions.

The Rexin High Pressure Vacuum Gas Quenching Furnace integrates a vacuum pumping system and PLC-based control system for coordinated heating, vacuum processing, and gas quenching operations.

Vacuum Pumping System

The reference configuration includes:

• Backing vacuum pump with a pumping capacity of ≥300 m³/h

• Roots vacuum pump with a pumping capacity of ≥2000 m³/h

• Vacuum valves, pipelines, and pressure measurement instruments

• Reference ultimate vacuum: 8.0 × 10⁻¹ Pa (cold state)

The vacuum system evacuates the furnace chamber before heating and supports controlled vacuum processing according to the selected heat treatment program.

PLC Control System

The reference configuration uses a Siemens PLC to coordinate furnace operation.

Main control functions include:

• Programmable heating and temperature control

• Vacuum pressure monitoring

• Automatic control of vacuum valves and pumping sequences

• Gas quenching sequence control

• Temperature and process monitoring

• Alarm indication and safety interlocks

• Automatic and manual operating modes

The control system can be configured according to customer process requirements and the final equipment design.

The above specifications represent a reference furnace configuration. Final technical parameters, performance requirements, and acceptance criteria will be confirmed according to the customer's workpiece and heat treatment requirements.

Rexin provides customized high-pressure vacuum gas quenching furnace solutions based on workpiece materials, production capacity, and heat treatment requirements.

Available Customization Options

• Working Chamber Dimensions: Effective heating zone dimensions can be designed according to workpiece size and loading arrangement.

• Loading Capacity: Furnace load capacity can be adapted to different batch weights and production requirements.

• Heating System: Heating temperature range, heating power, and chamber configuration can be evaluated according to the required heat treatment process.

• Gas Quenching System: Quenching pressure, gas circulation, and cooling system configuration can be selected based on material grade and cooling requirements.

• Vacuum System: Vacuum pumping capacity and operating vacuum requirements can be configured for the intended process.

• Control System: PLC control, process monitoring, temperature recording, and operating functions can be configured according to project requirements.

• Electrical Requirements: Power supply and electrical configuration can be adapted to the customer's installation conditions.

Engineering Support

Rexin can review workpiece drawings, material specifications, batch loading requirements, and target heat treatment results to develop a suitable technical proposal.

Final equipment specifications are subject to engineering evaluation and confirmation before production.

Q1: What is a high-pressure vacuum gas quenching furnace used for?

It is used for vacuum heating and high-pressure gas quenching of suitable metal components, including tool steels, high-speed steels, and certain stainless steel grades.

Q2: What is the maximum gas quenching pressure?

The reference configuration supports nitrogen gas quenching at pressures up to 10 bar absolute. Other pressure requirements can be evaluated according to the project.

Q3: What is the maximum working temperature?

The reference furnace has a maximum heating temperature of 1320°C, with an operating temperature range of 150–1300°C.

Q4: Can the furnace dimensions and loading capacity be customized?

Yes. Rexin can evaluate customized working chamber dimensions and loading capacities based on workpiece size, batch weight, and production requirements.

Q5: Can this furnace achieve a specific hardness after quenching?

Achievable hardness depends on the material grade, workpiece dimensions, quenching conditions, and heat treatment process. Customers can provide their material specifications and target hardness for technical evaluation.

Q6: What information is needed for a quotation?

Please provide the workpiece material, dimensions, maximum batch weight, required heat treatment temperature, quenching requirements, and factory power supply. Workpiece drawings and target hardness requirements are also helpful.