vacuum gas quenching furnace steel treatment

 

Heat treatment is the process by which metal/steel parts are completely or partially exposed to a time-temperature sequence to alter mechanical and/or corrosive properties. There are many application areas, such as:

 

• annealing, hardening, tempering, aging, surface hardening

 

In order to obtain higher material strength, better wear resistance or improve the corrosion behavior of components. All these processes need to be as high as 1.000 ℃ or higher temperature and the furnace specially developed in order to achieve such a range.

 

 

Annealing is a heat treatment that involves heating to a specified temperature, slowly holding and cooling. These processes are often used to obtain the softer structure of the component and to optimize the material structure for subsequent work steps (machining, forming). The parameters depend on the material and the desired structure.

 

 

Hardening heat treatment process is a typical, heated to certain temperature combined (most of above 900 ° C), and rapid cooling or quenching parts directly. Selection requires partial or complete transformation of the material into martensite. The parts are tempered after hardening to obtain high ductility and toughness.

 

 

One of the important processes is surface hardening or carburizing. Heat the parts to 900 ° C to 1.000 ° C, and by adding the specific gases to the atmosphere in the furnace (hydrocarbons), by absorbing carbon to enrich parts surface. After this treatment, parts are quenched to obtain the desired properties. This results in greater resistance to stress and friction on the surface of the component. The core of the component remains slightly softer and more malleable, allowing the component to withstand high stresses throughout its life. For example, all gear components used in a transmission are handled in this way.

 

Name	Parameter
vacuum heat treatment furnace (hardening, annealing, tempering, quenching)	steel heat treatment
Model	Horizontal / Vertical
Ultimate vacuum	Custom made
Pressure rising rate	0.5pa/h ( adjustable )
Max temperature	Custom made
Temperature uniformity	±3℃ / ±5℃
Heating power	Custom made
Temperature control method	Intelligent programmable temp controller
Control method	PLC auto/manual interlock protection
Max gas charging pressure (absolute pressure)	Custom made

 

Application: die steel, stainless steel, gear, high speed steel, tool steel, etc.

 

Advantages of vacuum heat treatment

 

Vacuum as "protective atmosphere"

 

• no toxic protective gas containing CO

 

• there is no health hazard in the workshop

 

• there is no danger of explosion or open fire

 

• no furnace adjustment

 

• use inert gases (nitrogen or helium)

 

• no carbon dioxide emissions

 

Vacuum carburizing

 

• use various processes

 

• use different gases

 

• shorter carburizing cycle than traditional techniques

 

• higher carburizing temperatures can further reduce processing time

 

• stinginess costs l instead of m3

 

Gas quenching replaces oil quenching

 

• clean dry parts after hardening

 

• no washing machine - no washing water

 

• no maintenance of washing equipment is required

 

• no complex washing water chemistry

 

• save space

 

• cost-effectiveness

 

• quenching strength is controlled by gas pressure or gas speed

 

• no steam blanket during quenching

 

• uniform quenching

 

• reduce distortion

 

Surface effect

 

• no surface oxidation

 

• no surface decarburization

 

• bright, metallic, shiny parts

 

Plant operation/installation/maintenance

 

• weekends are not free

 

• no continuous gas consumption

 

• short heating time

 

• quick access to installed modules

 

• no fire detection or sprinkler system

 

• no open fire

 

• non-flammable gas mixture

 

• cold wall technology

 

• no gas emissions

 

• minimum energy loss

 

• no atmospheric heat radiation

 

Auxiliary equipment that no longer requires protective gas installations, such as:

 

• fire safety equipment

 

• sprinkler system

 

• exhaust

 

• CO2 fire extinguisher for oil bath

 

• measure CO concentration in the workshop

 

• smoke extraction from roof (automatic opening and closing)

 

• oil proof floor or water tank

 

• methanol storage