FIELD: process engineering.
SUBSTANCE: invention relates to metallurgy. Retainer body is made of refractory material and shaped to cylinder. Said body has first end 10, second end 14 and mid zone there between. Said body has the bore extending axially from first end 10 via mid zone 12 towards second end 14. Part of said bore extending along mid zone 12 gas cross-section increased compared to that of said first end 10 to sustain the stress originating at retainer mid zone.
EFFECT: perfected design.
11 cl, 2 dwg
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