Nonswirl Nozzlles

Nonswirl Nozzlles

Technical characteristics

In 1986 – 1987 VIO in collaboration with Borovichi Refractories Plant has developed process of corundum-graphite nonswirl nozzles production, which excluded application of unavailable and expensive materials – crystalline silicon and silicon carbide and use of expansive operations of hard firing and air brick glazing.

During 1986 – 1990 corundum-graphite nonswirl nozzles of KG grade have been tested and found application at all largest metallurgical plants in USSR: CherMK, NLMK, OKhMK, OEMK, UzbMZ, BMZ. Corundum-graphite nonswirl nozzles exhibited at VDNKh in USSR and awarded silver medal in 1989. It is known that corundum-graphite nonswirl nozzles the same as submersible nozzles are apt to healing, especially during teeming of aluminum-killed steels. Healing of nozzle channel is conditioned by number of physico-chemical processes. Healing leads to loss of efficiency of continuous-casting plants, necessity of blowing of “healed” nozzle channel by oxygen gas, early termination of teeming and finally to stock appreciation.

Further developments of JSC “Borovichi Refractories Plant” on advancement of production processes resistant to healing of nonswirl nozzles, lead to creation of biceramic product with so called “anticlogging” coating of nozzle channel, which prevents its healing by nonmetallic deposits. Well-known fact of absence of healing in nonswirl nozzles based on zircon push to the following in-house development this time – zircon-based anticlogging coating. Nonswirl nozzle with zircon-based coating did not displayed surface deterioration of working channel or any deposits after service.

JSC “Borovichi Refractories Plant” has developed production process of nonswirl nozzle with porous insert inside channel for argon blow, which considerably decreased extent of steel-pouring channel healing by nonmetallic inclusions.

 Rate for grade
  Nonswirl nozzles Collector nozzles
KUSD-80 КUSD-GS
МКUSТ-80
Main layer Gas-permeable layer
GOST R 52801-2007 Spec. 14-194-299-10 GOST R 52707-2007 rev.1

Mass fraction, %:

 

Al2O3 (of baked substance), minimum 80 80 80 80
С, withing limits of 5-9 - - 5-8
С (Changes in weight during baking) - 5-9 minimum 4 -
Compressive strength, N/mm², minimum - 30  20 -
Open porosity, %, maximum 13 13 18 12

 

 Rate for grade
  КGI SDPU
Spec. 14-194-230-98 Spec. 14-194-284-08

Mass fraction of baked substance, %:

Al2O3, minimum

MgO, minimum

С, withing limits of

 


80

-

5-9

 


maximum 1,0

90

8-11

Apparent density, g/cm³, minimum - 2,87
Open porosity, %, maximum 13 8

 

KGI – graphitiferous nonswirl nozzle

SDPU – periclase-carbonaceous nonswirl nozzle

 

 

 Rate for grade 
  SD-KG SD-КGV
SD-КG1V1 SD-KG1V2
Spec. 14-194-283-08

 

 

product shank funnel product shank funnel product shank funnel

Mass fraction of dry substance, %:

Al2O3, minimum

С, minimum

MgO, minimum

 

67

13

-

 

45

26

-

 

67

13

-

 

45

26

-

 

-

13

70

 

45

26

-

 

-

10

65

Apparent density, g/cm³, minimum 2,60 2,28 2,60 2,28 2,60 2,28 2,50
Open porosity, %, maximum 20

 

 Rate for grade
  SD-КG2V SD-КG2V1 SD-КG2V2
Spec. 14-194-283-08

 

product shank funnel product shank funnel product shank funnel

Mass fraction of dry substance, %:

Al2O3, minimum

С, minimum

MgO, minimum

 

47

23

-

 

67

13

-

 

47

23

-

 

-

13

70

 

47

23

-

 

-

10

65

Apparent density, g/cm³, minimum 2,40 2,60 2,40 2,60 2,40 2,50
Open porosity, %, maximum 20

Shape and dimensions of nonswirl nozzles should correspond to the customer’s drawings, approved by the manufacturer. Working surface is specified in the drawings.

Nonswirl Nozzles of fast change

 Rate for grade
   BSDKG2V3
Technical agreement

 

Main composition Gas-permeable layer Contact surface

Mass fraction of dry substance, %: 

Al2O3, minimum

С, minimum

 

47

23

 

55

9

 

53

9

Apparent density, g/cm³, minimum 2,40 2,45 2,40
Open porosity, %, maximum

20

25 20

 

Form an ddimensions GOST R 52801-2007

NumberDimensions, mm
   H h D D1 D2 d  d1 r e k h1
9 290 20 160 116 136 50 40 70 68 90 -
10 52 42 68 90
11 56 46 68 90
12 60 50 67 95
13 66 56 66 99 3
14 70 60 65 101
15 290 25 190 130 160 65 55 70 68 97 -
16 70 60 66 100
17 75 65 65 103 3
18 80 70 65 104 -
19 85 75 65 110 5
20 90 80 65 112.5
21 100 90 63.5 117.5
22 290 20 160 116 136

20

22

24

26

28

30

32

34

36

38

40

42

44

46

48

50

52

54

43 52 40 115 16

Limit deviations of dimensions

Dimensions, mmLimit deviations, mm
   Diameter:  
   up to 50 inc. ±1
   over 50 up to 100 inc. ±2
   over 100 ±3
   Height ±10
   Height of bead and grooves ±1