Background technology
Used for metal continuous casting plate blank tundish quick-replaceable sewage outlet is to be used for the disposable refractory component of direct casting, is one of functional part of most critical in the casting process.It is installed between tundish and the crystallizer; it is molten steel is transported to crystallizer from tundish passage; its function is that the protection molten steel is not oxidized; prevent that nitrogen from dissolving in or covering slag is sneaked into molten steel and prevent that molten steel from splashing, guarantee that molten steel has a rational flow field and temperature field distribution in crystallizer. under the slab quality quality at the mouth of a river be directly connected to whether continuous casting process can normally carry out, length and the slab quality of continuous casting time.Particularly slag line is most important position, the mouth of a river under the slab, is the position of easy generation quality accident, is again the following mouth of a river of the decision key position in service life.The conventional way of metal continuous casting plate blank tundish quick-replaceable sewage outlet of the prior art is that body material and slag line material are a kind of material, because the composition and the component of the refractory material that adopts are unreasonable, cause product high temperature resistant, thermal shock resistance is good inadequately, anti-erosion, thermal shock strength are not high enough, antistrip performance is not good, cause down mouth of a river product short service life, mechanical strength is low, production cost is high.
A kind of high temperature resistant, thermal shock resistance will be got well, anti-erosion, thermal shock strength height, and the antistrip performance excellence, long service life, mechanical strength height, the used for metal continuous casting plate blank tundish quick-replaceable sewage outlet that production cost is low are that people expect.
Summary of the invention
The objective of the invention is to avoid above-mentioned weak point of the prior art, and provide a kind of high temperature resistant thermal shock resistance to get well, the anti-erosion thermal shock strength is good, anti-strip excellence, long service life, mechanical strength height, used for metal continuous casting plate blank tundish quick-replaceable sewage outlet and manufacture method thereof that production cost is low.
Purpose of the present invention can reach by following measure:
Used for metal continuous casting plate blank tundish quick-replaceable sewage outlet of the present invention, comprise body and slag line, it is characterized in that described slag line is composited by interior slag line and outer slag line, body, interior slag line, outer slag line are made up of with the refractory material of different proportionings different component respectively, comprise following with component materials in parts by weight:
A. body material
B. interior slag line material
C. outer slag line material
Slag line is most important position, the mouth of a river under the slab, it is the position of easy generation quality accident, it is again the decision mouth of a river key in service life, the ZrO2-C material is general slag line material, and the key that improves the mouth of a river down service life is exactly to improve the corrosion resistance of ZrO2-C material, the quality of the key element electric-melting zirconia raw material of major control, zirconic addition, zirconic granularmetric composition, the quality of crystalline flake graphite, suitable additive etc. the present inventor has taken into full account slag line inner anti-washing away in the mouth of a river under the slab, the outside anti-erosion of slag line, refractory material component and the proportioning of taking specification requirement with it to be complementary, adopt the technical scheme of inside and outside composite slag line, the anti-electric smelting stabilizing zirconia that washes away of outer employing is main material, and internal layer adopt anti-erosion effect preferably white fused alumina be main material, operation meticulously, and optimize, significantly reduced cost, also improved product quality.In addition, the design of the refractory material of mouth of a river body part has adopted alumine and quartz to replace normally used brown corundum and white fused alumina in the past, has reduced cost in the prerequisite that does not influence quality, thereby has finished the present invention.
Purpose of the present invention can also reach by following measure:
Used for metal continuous casting plate blank tundish quick-replaceable sewage outlet of the present invention is characterized in that its described body, interior slag line, outer slag line be made up of with the refractory material of different proportionings different component respectively, comprises following with component materials in parts by weight:
A. body material
B. interior slag line material
C. outer slag line material
Said components and proportioning are the disclosed optimized technical scheme of inventor.
Used for metal continuous casting plate blank tundish quick-replaceable sewage outlet of the present invention, manufacturing a product reaches following technical indicator:
The preparation method of used for metal continuous casting plate blank tundish quick-replaceable sewage outlet of the present invention comprises the steps:
A. batch mixing:
According to drafting prescription accurately metering body material, interior lines material, each component of outside line material, drop into respectively in the high speed mixing roll separately, add jet printing type and add bond, high speed is mixing evenly, and is standby;
B. dry:
Drying equipment is dried and put into constant temperature and humidity material storehouse after the serviceable condition and deposit, and is standby;
C. moulding:
The dry good raw material for refractory of step b packed into takes to meet in the gum cover of technical requirement on design, with isostatic pressing machine at 125 MPa forming under the pressure;
D. oven dry:
With the semi-finished product oven dry of step c moulding, burn till fully;
F. burn till:
Through more than 50 hours burn till, the burning kiln temperature is risen to 1020 ℃, and insulation was burnt till under 1020 ℃ in 50-60 hour, be equipped with Vehicle Processing;
G. Vehicle Processing:
Machine by technical requirement on design behind the kiln discharge;
H. whitewash, pack, the quality inspection warehousing after passing.
The manufacture method of used for metal continuous casting plate blank tundish quick-replaceable sewage outlet of the present invention is applicable to the manufacturing at the mouth of a river under the metal continuous cast slab immersion of all size model.
Technical scheme of the present invention has outstanding substantive distinguishing features and obvious improvement compared to existing technology, produces following good effect:
1. provide a kind of high temperature resistant thermal shock resistance to get well, the anti-erosion thermal shock strength is good, anti-strip excellence, long service life, mechanical strength height, used for metal continuous casting plate blank tundish quick-replaceable sewage outlet and manufacture method thereof that production cost is low.
2. it is short service life to have solved mouth of a river product down of the prior art, the problem that mechanical strength is low, production cost is high.
3. descend mouth of a river product to reach following technical indicator: rupture strength>4Mpa, compressive resistance>16Mpa, compressive resistance>16Mpa, apparent porosity<20%, number of times>5 are stablized in thermal shock.
4. the manufacture method of used for metal continuous casting plate blank tundish quick-replaceable sewage outlet of the present invention is applicable to the manufacturing at the mouth of a river under the metal continuous cast slab immersion of all size model.
The specific embodiment
The present invention will now be further detailed embodiment:
As figure, used for metal continuous casting plate blank tundish quick-replaceable sewage outlet comprises body 1 and slag line, and described slag line is composited by interior slag line 3 and outer slag line 2, and slag line bottom side opening 4 is the molten steel outflow end.
Embodiment 1
A. batch mixing:
Body material: accurately measure graphite 20 weight portions, alumine 24
#15 weight portions, alumine 36
#13 weight portions, alumine 150
#25 weight portions, quartzy 20 weight portions, metallic silicon 3 weight portions, boron glass powder 2 weight portions drop in the body material high speed mixing roll, add jet printing type and add bond, and high speed is mixing evenly, and is standby;
Interior slag line material: accurately measure graphite 25 weight portions, white fused alumina 65 weight portions, metallic silicon power 3 weight portions, carborundum powder 2 weight portions, alumina powder 5 weight portions drop in the material high speed mixing roll of interior lines, add jet printing type and add bond, and high speed is mixing evenly, and is standby;
Outer slag line material: accurately measure graphite 10 weight portions, electric smelting stabilizing zirconia 85 weight portions, metallic silicon 3 weight portions in the slag line material high speed mixing roll, add jet printing type and add bond in carborundum 2 weight portions drop into, and high speed is mixing evenly, and is standby;
B. dry:
With the body material of step a preparation, interior slag line material, outer slag line material respectively drying equipment dry and put into constant temperature and humidity material storehouse after the serviceable condition and deposit, standby;
C. moulding:
Dry good body material, interior slag line material, the three kinds of raw material for refractory of outer slag line material of step b are packed into take to meet in the gum cover of technical requirement on design, with isostatic pressing machine at 125 MPa forming under the pressure;
D. oven dry:
With the semi-finished product oven dry of step c moulding, burn till fully;
F. burn till:
Through more than 50 hours burn till, the burning kiln temperature is risen to 1020 ℃, and insulation was burnt till under 1020 ℃ in 50-60 hour, be equipped with Vehicle Processing;
G. Vehicle Processing:
Machine by technical requirement on design behind the kiln discharge;
H. whitewash, pack, the quality inspection warehousing after passing.
Product reaches following technical indicator:
Embodiment 2-6 makes used for metal continuous casting plate blank tundish quick-replaceable sewage outlet of the present invention according to method and the step of embodiment 1 according to the prescription of table 1
Table 1