Tempering Furnace

Features
Max. working temperature	≤750°C
Furnace Temperature Uniformity	≤±5℃
Ultimate Vacuum Level	10⁻⁴ Pa
Leak-up Rate	≤0.5 Pa/h
Maximum gas cooling pressure	<2 bar
High-vacuum sealed chamber enables oxidation-free bright heat treatment of workpieces.
Horizontal & vertical structures optional, all specifications customizable.

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Product Overview

HZR horizontal & HZRL vertical pressurized gas-cooled vacuum tempering furnaces are single-chamber internal-heating vacuum heat treatment equipment. Featuring an optimized sealed furnace chamber structure combined with a low-temperature forced convection heating system, they are applicable to vacuum tempering of various die steels, structural steels and stainless steels, as well as bright annealing, solution treatment and aging processes for non-ferrous metals such as aluminum and copper.

The horizontal model is standard-equipped with a hinged pneumatic clamping furnace door, while the vertical model adopts an elevating furnace door driven by lead screw lifting transmission. The furnace is fitted with nickel-chromium alloy strip heating elements and multi-layer all-stainless steel heat shields, together with a low-pressure circulating pressurized gas cooling system rated below 2 bar, which effectively prevents temper brittleness defects.

The complete machine is equipped with an integrated intelligent control system consisting of PLC and industrial touch screen, which supports process program storage, real-time parameter monitoring, data curve recording and automatic fault alarming. It is furnished with full-loop safety interlock protection, and a remote fault diagnosis module is available as an optional accessory. A complete range of standard models is provided, and non-custom customization is supported across the entire product line.

Technical Advantages

1. Vacuum Sealing Structure, Oxidation-free Workpiece Surface

Equipped with high-vacuum pumping units and pneumatically clamped sealed furnace structure, the system rigorously restricts residual oxygen inside the chamber. After tempering, workpieces retain their original bright metallic surface, eliminating subsequent polishing and sandblasting procedures. This cuts post-processing costs effectively and raises product yield.
2. Convection Temperature Equalization, Superior Batch Process Consistency

A dedicated low-temperature air duct paired with forced convection circulation compensates insufficient thermal radiation at low temperatures. Temperature deviation across the entire hot zone is controlled within ±5°C, ensuring uniform and stable hardness & microstructure for mass tempered workpieces.
3. Low-Pressure Gentle Gas Cooling to Restrain Temper Brittleness & Deformation

Cooling is realized via circulating inert gas below 2 bar with controllable mild cooling rates. This technologically prevents temper brittleness cracking of high-alloy steel and drastically reduces thermal deformation of precision components during heat treatment.
4. Fully Automatic Intelligent Control, Full-life Traceable Production Data

The touchscreen HMI system stores hundreds of heat treatment recipes to automatically execute heating, soaking and gas cooling cycles. Real-time curves, historical operation logs and fault reports can be saved, retrieved and printed, facilitating workshop production record management.
5. Safe & Reliable, Easy Maintenance & Eco-friendly

Multiple safety protections including furnace door interlock, over-temperature and over-pressure protection are configured, with automatic shutdown and alarm upon faults. The equipment generates no waste gas or wastewater during operation with low noise levels, complying with domestic environmental access standards. Consumable parts adopt universal design to lower daily maintenance workload.

Application Scope

1. Mold Manufacturing

Vacuum tempering for high-speed steel, tool & die steel and stainless steel molds. Applicable to injection molds, die-casting molds, stamping molds and precision cavity molds to improve mold hardness, wear resistance and service life.

2. Cutting Tools & Precision Tools

High-speed steel tools, alloy cutting tools, drill bits, milling cutters, taps, gear cutters and precision gauges. Guarantees cutting edge quality, dimensional accuracy and surface finish.

3. Aerospace & High-End Equipment

Vacuum tempering for structural parts made of high-strength steels (A100, 300M, 30CrMnSiA, D406A) and stainless steel; vacuum heating, pressurized gas cooling and vacuum annealing for titanium alloy components, meeting reliability requirements of military high-end parts.

4. Automotive Components

Tempering and stress relief for gearbox gears, transmission shafts, synchronizers, clutch structural parts and motor cores, satisfying mass-production heat treatment requirements with low deformation.

5. Precision Mechanical Parts

Mass tempering of precision gears, bearings, shafts, elastic components, hydraulic parts and fasteners, suitable for precision parts with strict dimensional tolerance and deformation control requirements.

Product Specifications

Parameter Item	Unit	HZR-20	HZR-40	HZR-80	HZR-160	HZR-190
Effective Heating Zone Dimension	mm	450×300×300	600×400×400	900×600×600	1200×800×800	1300×900×900
Rated Loading Capacity	kg	100	200	500	1000	1200
Heating Power	kW	20	40	80	160	190
Maximum Operating Temperature	℃	750
Furnace Temperature Uniformity	℃	≤±5
Ultimate Vacuum	Pa	5×10-4
Pressure Rise Rate	Pa/h	≤0.5
Max. Gas Cooling Pressure	bar	＜2

Custom Non-Standard Solutions

Structural Customization

Horizontal and vertical furnace bodies are interchangeable; furnace door can be configured as hinged type or elevating type as required.
Parameter Customization

Chamber inner dimension, rated loading capacity, heating power and vacuum configuration grade can be optimized on demand.
Process Customization

Convection structure and gas cooling control system are optimized for titanium alloys, copper alloys and special magnetic materials.
Auxiliary Configuration Customization

Remote diagnostic system, automatic pressure-stabilized nitrogen supply unit and external data export & printing system are available as optional add-ons.

Our Services

Standardized response mechanism

• 4-hour rapid response to demands.

• Engineers will arrive within 24 hours within a 400km radius.

• Free troubleshooting/repair/replace parts within 48 hours.

• No cost: All expenses covered for non-human faults during the warranty period.
Full-Cycle Intelligent Maintenance

• 7×24-hour remote monitoring within the warranty/membership period

• Regular on-site inspection, maintenance and upkeep by professional engineers

• Core objective: Extend the service life of equipment
Customized Preventive Maintenance

• Adjusted according to usage intensity, operating frequency, local temperature and humidity, etc.

• Custom exclusive plans for advance risk troubleshooting

• Reduce unplanned downtime
Lifetime Membership Service

• Complete membership benefits available after the expiration of the warranty period

• Lifetime 4S-style equipment maintenance, servicing and technical upgrades

• Continuous optimization of equipment performance and value
Systematic Hands-on Training

• One-on-one on-site tutoring by senior engineers after equipment commissioning

• Instruction on operation, maintenance and basic troubleshooting

• Practical assessment until proficient mastery is achieved