3. Special heat treatments
3.1 Softening anneals
These treatments are applied to parts for which a high level of hardness is required, in order to obtain a softened structure to facilitate roughing by machining prior to quality treatment (hardening + tempering).
Four types of treatment can be applied, in increasing order of effectiveness (figure ):
simple annealing by prolonged holding at a temperature just below Ac 1 , for example at 650 ˚C on GX100CrMo6-1 (Z100CD6.1-M) steel (240 HB) or 700 to 760 ˚C on GX200Cr12 (Z200C12-M) steel...
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Special heat treatments
Bibliography
References
Standardization
French Standards Association (AFNOR)
- Vocabulaire du traitement thermique des produits ferreux - NF EN 10052 - janvier 1994
- août 2000 Aciers moulés de construction et d'usage général - Pr NF EN 10293 -
- Produits sidérurgiques. Détermination de la grosseur du grain ferritique ou austénitique des aciers - NF A 04-102 - novembre 1980
- Produits de fonderie. Aciers et fontes blanches moulés résistant...
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