METHOD OF CENTRIFUGAL CASTING OF THIN-WALL TUBES OF HEAT-RESISTANT ALLOYS Russian patent published in 2017 - IPC B22D13/02 

FIELD: technological processes.

SUBSTANCE: invention relates to metallurgy and can be used for casting of complex alloyed heat-resistant alloy 50H32N43V5S2B2, in particular tubes with diameter of 0.076–0.159 m, wall thickness 0.008–0.014 m and length 3.0 m. On internal surface of mold heat-insulating material is applied as layer with thickness of 0.0007–0.0012 m. Metal released from furnace into ladle is poured into mold, heated to 150–250 °C and rotating with speed corresponding to value of gravitation coefficient, equal to 70–160, on inner surface of cast. Metal tapping from furnace into ladle is carried out at temperature within range [T_liq+k₁⋅(1,695-T_liq)] °C, where T_liq is liquidus temperature of metal, k₁ – empirical coefficient equal to 0.78…1.00. Pouring of metal into mold is performed at weight rate of 8–16 kg/s and temperature within range of [T_liq+k₂⋅(1,595-T_liq)] °C, where k₂ is empirical coefficient equal to 0.77…1.00.

EFFECT: production of pipes with dense and uniform structure, having improved short-term and long-term mechanical properties.

1 cl, 3 tbl