Vacuum Technology is the Basis for Process Innovation in Heat Treatment.
Heat Treatment is the process in which metallic/steel parts are exposed completely or partially to time-temperature sequences in order to change the mechanical and/or corrosion properties. There are numerous application areas, e.g.:
To achieve a higher strength of the material, better wear resistance or to improve the corrosion behaviour of the components.All of these processes need a temperature up to 1.000 °C and higher as well as especially developed furnaces to achieve such ranges.
Vacuum Annealing Annealing is one type of heat treatment comprising heating up to a specific temperature, holding and cooling down slowly. Such processes are generally used to obtain a softer structure of the part and to optimise material structure for subsequent working steps (machining, forming). Parameters depend on the material and the desired structure. Vacuum Hardening and Tempering Hardening is a typical heat treatment process combining heating to specific temperatures (mostly above 900 °C) and direct fast cooling or quenching of the part. The requirements are selected to change the materials’ structure partially or completely into martensite. The part undergoes tempering treatment after hardening in order to obtain high ductility and toughness. Vacuum Case Hardening One of the important processes is the case hardening or carburizing process. Parts are heated up to 900 °C - 1.000 °C and by adding specific gases (hydrocarbons) into the atmosphere of the furnace the part’s surface is enriched by absorbing carbon. Following this treatment the part is quenched in order to achieve the required properties. This results in higher resistance to stresses and friction on the component’s surface. The core of the part remains somewhat softer and more ductile which allows the part to carry high stresses through its entire life. For example, all gear parts for transmissions are treated this way.
Main technical data of vacuum heat treatment furnace
Application fields: Die steel, stainless steel, gear, high speed steel, tool steel and so on.
Advantages of Vacuum Heat Treatment
Vacuum as "Protective Atmosphere"
• No toxic protective gases containing CO
• No health hazards in the work shop
• No danger of explosion or open flames
• No furnace conditioning
• Use of inert gases (nitrogen or helium)
• No CO2 emission
• Use of various processes
• Use of different gases
• Shorter carburizing cycles than in conventional technology
• Higher carburizing temperatures offer potential to further reduce process time
• Small gas consumption l instead of m3
Gas Quenching Instead of Oil Quenching
• Clean, dry parts after hardening
• No washing machine - no disposal of washing water
• No maintenance of washing equipment
• No complicated washing water chemistry
• Saves space
• Cost benefits
• Quenching intensity is controlled via gas pressure or gas velocity
• No vapor blankets during quenching
• Homogeneous quenching
• Reduced distortion
• Free of surface oxidation
• No surface decarburization
• Bright, metallic, shiny parts
Plant Operation / Installation / Maintenance
• No idling over the weekend
• No continuous gas consumption
• Short heat-up times
• Fast access to installed modules
• No fire detection or sprinkler system
• No open flames
• No flammable gas mixtures
• Cold-Wall Technology
• No gas emission
• Minimum energy loss
• No heat radiation to atmosphere
Auxiliary Equipment of Protective Gas Plants are no longer required, like:
• Fire safety equipment
• Sprinkler system
• CO2 extinguisher for the oil bath
• Measuring CO concentration in the shop
• Smoke exhaust in the roof (automatic opening and closing)
• Oil-proof floor or tank
• Methanol storage
Packaging & Shipping
Why choose us
Q:Are you a factory?
A:Yes,We are China leading vacuum furnace manufacturer ,It was formerly known as China National Vacuum Research Institute. Our factory is covering an area of over 10,000sq.m.We have powerful R&D team and manufacturing facility.
Q:What kind of vacuum furnaces do you have?
A:We make all kinds of vacuum furnaces, widely used in materials, IT, metallurgy ,machinery
A:We can provide the regular and standard model sizes, at the same time, we can customize furnaces as product ,work piece size, and temperature requirement .Meanwhile, we offer OEM service under the strict industrialstandard.
Q:What kind of quality standard dose your furnace follow?
A:Firstly, we are ISO9001:2008 and CE certified factory, All the processes are strictly following the standard of the metallurgy process. In the factory, we have about 10 employees that work in the quality assurance department. We control the furnace quality in our factory as below:
1st step : Internal inspection (such as the supply chain management
,in-process quality control and final quality assurance which are executed by our QC engineer according to the technical contract)
2nd step: Pre-acceptance standard (buyer send engineers to check or entrust the third party to do in our factory,)
3rd step: Site acceptance(After the installation of vacuum furnace in user’s factory, we sign the reception report )
Q: Is it hard to operate &maintain?
A:Our furnace has the PLC controller and intelligent programmable temp. Controller, user can use touch screen to set curves, auto/manual switch interlock, auto &monitor system, it is easy to operate. We prepare enough spare parts for user and on line technical support.
Q:Can you serve customer oversea like installation and debugging ?
A:Yes,we can dispatch our engineer to your city for installation and debugging or other service. Meanwhile,we will offer relevant documents: The plan of equipment, Foundation condition graph, The layout of equipment, Electric control system schematic diagram, Main accessories operating instructions & qualification and on.
Q:How about training ?
A:Buyer sent operator to our factory to get trained about the furnace operation; Our engineers offer training in the users working site.
Q:What about payment terms?
A:L/C, T/T, and so on.
Q:How long is your furnace warranty period ?
A:Since passing the site acceptance ,it has 12 months warranty period .
Q:How to get quick quotation from us?
A:Please offer us the treating material, the work piece size, max. Temperature, heating zone dimension, vacuum degree and other special requirement. Then we can quote you ASAP.