NORMALIZATION AND ANNEALING OF STEEL ШХ15

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Published on Sep 10, 2020
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Channel support (for consumables) https://www.donationalerts.com/r/ppage ATTENTION! THE HOLDING TIME AT THE NORMALIZATION TEMPERATURE IS CALCULATED AS 1.5 MINUTES PER 1MM OF PART CROSS-SECTION! 40-60 MINUTES OF HOLDING TIME SHOULD BE ADDED ONLY IF AFTER NORMALIZATION THE ANNEALING WILL BE ACCELERATED, I.E. LASTING 30 MINUTES, NOT 90 MINUTES. Before hardening, the parts must be prepared. For this, normalization and annealing are done. Their purpose is to reduce the brittle cementite network, align the structure, refine the grain, in addition, annealing is carried out for hardened parts before re-hardening in order to eliminate the consequences of improper heat treatment. The normalization temperature for ШХ15 is 900-920 degrees, the holding time is calculated as 1.5 minutes per 1 mm of section (similar to quenching), if accelerated annealing follows, then 40-60 minutes are added to the holding time. Annealing temperature is 780-800 degrees, holding time is not less than 90 minutes, in the case of accelerated annealing with preceding normalization lasting 40-60 minutes, annealing is carried out for 30-40 minutes.

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