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
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