RU2000110734A

RU2000110734A - CRYSTALIZER PIPE FOR CONTINUOUS STEEL CASTING, IN PARTICULAR, PERITECTIC STEELS, AND A CRYSTALIZER EQUIPPED WITH SUCH PIPE

Info

Publication number: RU2000110734A
Application number: RU2000110734/02A
Authority: RU
Inventors: Адриан ШТИЛЛИ
Original assignee: Конкаст Штандард Аг
Priority date: 1997-10-01
Filing date: 1998-09-14
Publication date: 2002-04-10

Claims

1. A mold pipe for continuous casting of steels, in particular peritectic steels, having a first longitudinal segment (1) including a predetermined position (h) of the pouring level and a second longitudinal segment adjacent to the first (2), the first longitudinal segment (1) being or near the outer side of the mold pipe (10) includes at least one heat-insulating section (16), made in such a way that the thermal resistance of the mold pipe (10) in the first longitudinal segment (1) has a greater value than in the second P a native segment (2), characterized in that the heat-insulating section is a heat-insulating layer (16) that fills the zone between the outer surface (11) of the mold pipe (10) and the distance of at most 75% of the thickness (d _w ) of the pipe wall (10) mold measured from the outer surface (11) of the mold pipe (10).

2. A pipe according to claim 1, characterized in that the outer surface (11) of the mold pipe (10) is stepless at the boundary between the longitudinal segments (1, 2).

3. The pipe according to one of paragraphs. 1 or 2, characterized in that the thickness (d) of the insulating layer (16) is calculated so that during casting the temperature on the inner side (25) of the mold pipe (10) does not exceed a predetermined critical temperature T _k .

4. The pipe according to one of paragraphs. 1-3, characterized in that the insulating layer (16) is embedded in a tubular body (15) of metal or a metal alloy.

5. A pipe according to claim 4, characterized in that the mold pipe (10) is made from the point of view of heat engineering for continuous casting while cooling the outer surface (11) by loading with a refrigerant, the thickness d of the heat-insulating layer (16) in the level position (h) fill calculated by the equation:

where λ _W is the thermal conductivity of the mold pipe (10) in the second longitudinal segment (2);
f is the ratio λ _W / λ _i , where λ _i denotes the thermal conductivity of the insulating layer (16);
T _to - critical temperature;
T _s is the temperature of the steel on the inner surface (25) of the mold pipe (10);
t _l - refrigerant temperature;
α is the heat transfer coefficient for the transition between the refrigerant and the insulating layer (16).

6. The pipe under item 5, characterized in that f≥4.

7. The pipe according to claim 5 or 6, characterized in that the thickness (d, b) of the insulating layer increases in the interval between the position (h) of the fill level and the second longitudinal section (2) in the direction of the second longitudinal section.

8. A pipe according to claim 7, characterized in that the increase in the thickness of the heat-insulating layer (16) is designed so that the temperature on the inner surface (25) of the mold pipe (10) during the casting process is approximately constant in the casting zone.

9. The pipe according to any one of paragraphs. 4-8, characterized in that the insulating layer (16) is made of metal, for example, Nickel or chromium, and the tubular body (15) is made of copper or copper alloy.

10. A mold for the continuous casting of steels, in particular peritectic steels, containing a pipe (10) according to any one of paragraphs. 1-9.

11. The mold according to claim 10, characterized in that a device is provided for exposing the outer surface (11) of the pipe (10) with a refrigerant, for example, cooling with a water jacket.