Heat treatment of metals
What this code covers
Use this class for heat treatment of metals when the main activity includes General activities for the heat treatment of metals and Thermomechanical heat treatment of metals (e.g. preheating, annealing, hardening, tempering, quenching, deep freezing of metal). Check exclusions and nearby codes before applying it to a mixed activity.
Official NACE Rev. 2.1 labels and explanatory notes are imported from the source dataset. Plain-language explanations are shown separately so readers can compare interpretation with the source text.
No child codes; this is a class-level code.
- general activities for the heat treatment of metals
- thermomechanical heat treatment of metals (e.g. preheating, annealing, hardening, tempering, quenching, deep freezing of metal)
- thermochemical heat treatment of metals (e.g. carburising, carbonitriding, nitrocarburising, nitriding, oxidising, sulphidising, boriding)
- Activities primarily classified as coating of metals
- Activities primarily classified as machining of metals
- Compare with 25.51, 25.53, 25.5 when the main activity overlaps another code.
- Review the Rev. 2 to Rev. 2.1 mapping type before migrating old records.
- Check national equivalent caveats before using this code for local registration or filing workflows.
Use this guide as classification support, not legal, tax, filing, or regulatory advice.
- - general activities for the heat treatment of metals
- - thermomechanical heat treatment of metals (e.g. preheating, annealing, hardening, tempering, quenching, deep freezing of metal)
- - thermochemical heat treatment of metals (e.g. carburising, carbonitriding, nitrocarburising, nitriding, oxidising, sulphidising, boriding)
- - General activities for the heat treatment of metals
- - Thermomechanical heat treatment of metals (e.g. preheating, annealing, hardening, tempering, quenching, deep freezing of metal)
- - Thermochemical heat treatment of metals (e.g. carburising, carbonitriding, nitrocarburising, nitriding, oxidising, sulphidising, boriding)
- - Activities primarily classified as coating of metals
- - Activities primarily classified as machining of metals
What is NACE 25.52 used for?
Use NACE 25.52 for heat treatment of metals when the main activity matches this scope: Use this class for heat treatment of metals when the main activity includes General activities for the heat treatment of metals and Thermomechanical heat treatment of metals (e.g. preheating, annealing, hardening, tempering, quenching, deep freezing of metal). Check exclusions and nearby codes before applying it to a mixed activity.
What are typical examples for 25.52?
Typical examples include General activities for the heat treatment of metals, Thermomechanical heat treatment of metals (e.g. preheating, annealing, hardening, tempering, quenching, deep freezing of metal), and Thermochemical heat treatment of metals (e.g. carburising, carbonitriding, nitrocarburising, nitriding, oxidising, sulphidising, boriding).
When might 25.52 not be the right code?
No separate exclusion examples are available for this record yet; compare nearby hierarchy records before final selection.
Which codes should I compare before choosing 25.52?
Compare 25.52 with 25.51 Coating of metals, 25.53 Machining of metals, and 25.5 Treatment and coating of metals; machining when the activity description is ambiguous.
Use this class for coating of metals when the main activity includes Galvanising, including general (batch) hot-dip galvanising and Phosphate or chromate conversion coating. Check exclusions and nearby codes before applying it to a mixed activity.
Use this class for machining of metals when the main activity includes Boring, turning, milling, eroding, planing, lapping, broaching, levelling, sawing, grinding, sharpening, deburring, sandblasting, tumbling, polishing, buffing, welding, splicing, etc., of metalwork pieces and Cutting of and engraving or writing on metals by means of laser beams. Check exclusions and nearby codes before applying it to a mixed activity.
Use this group for treatment and coating of metals; machining when the main activity includes Coating of metals and Heat treatment of metals. Check exclusions and nearby codes before applying it to a mixed activity.
Rev. 2 code 25.61 can map to more than one Rev. 2.1 class: 25.51 Coating of metals, 25.52 Heat treatment of metals, 25.53 Machining of metals.
Official close match imported from NACE Rev. 2.1.
Datasets, CRM segments, KYC rules, reporting logic, and historical joins may need review because the activity scope is not a simple unchanged carry-over.
Review the official explanatory notes for each target code and confirm whether the business activity still fits the suggested Rev. 2.1 class.