Metal Heat Treatment.
Heat treatment is a controlled process used to alter the microstructure of metals and alloys such as steel and aluminium to impart properties, which benefit the working life of a component, for example increased surface hardness, temperature resistance, ductility and strength. Heat treatment processes include case hardening, tempering, solution and ageing treatment, Specialty Stainless Steel Processes (S3P), annealing and normalising. MTL gas analysers offer a range of gas analysers, which are suitable for most types of atmospheres used in metal heat treatment processes.
Some examples include:
- Inert gas (nitrogen/argon) - Typically requiring the monitoring of low levels (ppm) of oxygen.
- Endo gas - Typically used to generate a reducing atmosphere where the oxygen content is measured in fractions of an atmosphere, partial pressure or oxygen potential.
- Dissociated Ammonia - For high hydrogen content atmospheres to protect easily oxidised materials or to nitride them. For the hydrogen content any of the K (thermal conductivity) analysers can be calibrated in percentage hydrogen or percentage ammonia dissociation.
- Hydrogen bearing atmospheres (HNx) - Typically used to generate more highly reducing atmospheres such as are used for stainless steel, galvanised sheet etc. For the oxygen content (or dewpoint) any zirconia based oxygen analyser with a reducing atmosphere sensor and software can be used.
For further information, please refer to our range of Technical Notes below:
- Technical Note 2 (Using zirconia oxygen analysers to measure the dew point of furnace atmospheres)
- Technical Note 3 (The use of zirconia oxygen analysers in heat treatment)
- Technical Note 5 (Oxygen potential measurements in metal heat treatment processes)