CN105665663A

CN105665663A - Crystallizer

Info

Publication number: CN105665663A
Application number: CN201610235042.2A
Authority: CN
Inventors: 聂文金
Original assignee: Jiangsu Shagang Group Co Ltd
Current assignee: Jiangsu Shagang Group Co Ltd
Priority date: 2016-04-15
Filing date: 2016-04-15
Publication date: 2016-06-15

Abstract

The invention discloses a crystallizer.A chamfer angle is arranged between the adjacent first side wall and second side wall in a transitional mode, the chamfer angle comprises at least two connected chamfer edges, and the included angle between the adjacent chamfer edges is an obtuse angle.The crystallizer is suitable for continuous casting high casting speed production, the phenomena that continuous casting billet cooling is uneven, and the corner supercooling is caused can be effectively relieved, and corner defects are prevented.

Description

Crystallizer

Technical field

The present invention relates to billet continuous casting production field, be specifically related to the crystallizer copper pipe of a kind of efficient production high-quality chamfering base.

Background technology

In square or rectangular billet caster production process, blank needs after going out crystallizer to accelerate cooling to guarantee steady production under high pulling rate, the pattern accelerating cooling has water-spraying control or aerosol cooling, owing to distance heart portion, blank corner is farthest, and it is subject to intersecting the overlapping cooling in two faces, corner temperature is minimum, bending straightening process is easy to produce corner crack, though metallargist has carried out big quantity research and improvement in cooling uniformity, but corner temperature can't be avoided completely low, corner crack happens occasionally, when especially needing to strengthen cooling to alleviate the portion's segregation of high-carbon steel core, blank corner crack is easier to occur.

The strand chamfering technology of development in recent years, for preventing and treating strand corner crack have good effect, as on slab widely apply big chamfer crystallizer copper coin, solve the transverse corner crack of alloy steel sheet billet well. But on the square billet adopting crystallizer copper pipe to produce, rectangular bloom, chamfering technology breaks through not yet.

Patent of invention CN202715798U discloses a kind of crystallizer copper pipe producing octagonal continuous casting billet, can the corner crack of the side's of preventing rectangular bloom preferably, but owing to its chamfering mode is excessively near heart portion, under high pulling rate, to go out chamfering corner green shell during crystallizer thin for strand, bleed-out or longitudinal crack easily occur, constrains the application that its rectangular bloom below high pulling rate efficiently produces.

Summary of the invention

It is an object of the invention to provide a kind of crystallizer, it can effectively solve the generation of strand corner crack, and to be capable of under high pulling rate square and the efficient production of continuous cast rectangle billet.

For achieving the above object, the present invention provides following technical scheme:

The open a kind of crystallizer of the embodiment of the present application, between its adjacent the first side wall and the second sidewall, transition has chamfering, and this chamfering includes at least two connected bevel edges, and between adjacent described bevel edge, angle is obtuse angle.

Preferably, in above-mentioned crystallizer, described the first side wall is perpendicular to described second sidewall.

Preferably, in above-mentioned crystallizer, arc transition between adjacent two described bevel edges,

And/or

Arc transition between the bevel edge that the first side wall is adjacent,

And/or

Arc transition between the bevel edge that second sidewall is adjacent.

Preferably, in above-mentioned crystallizer, described crystallizer inwall is from suitable for reading to end opening continuous and derivable transition.

Preferably, in above-mentioned crystallizer, the width of described the first side wall is 100～800mm, and the width of described second sidewall is 100～800mm, and the width of described bevel edge is 1～299mm, and the thickness of described the first side wall and the second sidewall is 10～40mm.

Preferably, in above-mentioned crystallizer, the tapering of crystallizer is 0.4%～10.0%.

Preferably, in above-mentioned crystallizer, described bevel edge is identical to the thickness of end opening from suitable for reading.

Preferably, in above-mentioned crystallizer, the surface of described the first side wall and/or the second sidewall is cambered surface or plane.

Preferably, in above-mentioned crystallizer, the interior wall coating of described crystallizer has chromium, nickel or cobalt alloy.

Compared with prior art, it is an advantage of the current invention that:

Four angles of this novel square shaped or rectangular bloom have carried out chamfering, and it can be effectively improved strand and accelerate corner temperature in cooling procedure, reduces corner crack; Meanwhile, compared with traditional octagon copper pipe, its corner is relatively outer, and strand chamfer site green shell in crystallizer is formed thicker, and strand is not easy bleed-out and produces lobe when going out crystallizer copper pipe, it is possible to achieve high pulling rate produces, and production efficiency is greatly improved.

Accompanying drawing explanation

In order to be illustrated more clearly that the embodiment of the present application or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 show in the specific embodiment of the invention 1 sectional view of crystallizer;

Fig. 2 show in the specific embodiment of the invention 2 sectional view of crystallizer;

Fig. 3 show in the specific embodiment of the invention 3 sectional view of crystallizer;

Fig. 4 show in the specific embodiment of the invention 4 sectional view of crystallizer;

Fig. 5 show in the specific embodiment of the invention top, α angle arc transition schematic diagram.

Detailed description of the invention

Crystallizer, between its adjacent the first side wall and the second sidewall, transition has chamfering, and this chamfering includes at least two connected bevel edges, and between adjacent bevel edge, angle is obtuse angle.

Further, the first side wall is perpendicular to the second sidewall. Preferably, crystallizer copper pipe was square or rectangle with four sidewalls of steel contacts before not chamfering. It should be noted that this case does not limit the quantity of sidewall.

Further, arc transition between adjacent two bevel edges,

And/or

Arc transition between the bevel edge that the first side wall is adjacent,

And/or

Arc transition between the bevel edge that second sidewall is adjacent.

In this technical scheme, the radius 1～50mm of arc transition.

Further, crystallizer inwall is from suitable for reading to end opening continuous and derivable transition. That is, crystallizer copper pipe each with the work surface of steel contacts from suitable for reading to end opening continuous and derivable transition, its tapering is 0.4%～3.0%, and tapering computing formula is: (upper open area-lower open area)/(upper open area × crystallizer height).

Preferably, cavity heights h is 100～800mm, and width S is 100～800mm (rectangular bloom two Symmetry Edge S is different); Four sidewall corners length 5～300mm inward start chamfering, and the length of four sidewall corners chamferings inward is identical or different, the length of side 1～299mm of bevel edge, crystallizer copper thickness of pipe wall 10～40mm.

Further, bevel edge is identical to the thickness of end opening from suitable for reading; Crystallizer copper pipe is camber or straight arc along throwing direction; The interior wall coating of crystallizer has chromium, nickel or cobalt alloy.

It is 0.5～4.5m/min that the crystallizer of this case is suitable for pulling speed of continuous casting.Its supporting tube type mold diversion water jacket inwall profile is identical with this crystallizer copper pipe, and diversion water jacket inner wall size is bigger than this crystallizer copper pipe outer wall, and diversion water jacket inwall is apart from this crystallizer copper pipe outer wall 2～20mm. The flange of the upper and lower bayonet socket of this crystallizer copper pipe and rubber seal profile are identical with this crystallizer copper pipe outer wall.

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is described in detail, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments. Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the premise not making creative work, broadly fall into the scope of protection of the invention.

Embodiment 1

Shown in Fig. 1, the present embodiment is applied on certain steel mill's billet caster crystallizer, crystallizer copper pipe end opening cavity heights h is 142mm, width s is 142mm, length of mould 1000mm, for tube type mold, the wall thickness t=12mm of crystallizer copper pipe, tapering 4.0%, mainly produces cord steel, prestress wire high-carbon steel, spring steel etc.

Chamfering A is started from sidewall 3 corner 27mm inward, bevel edge is 2, it is 150 ° that bevel edge 1 intersects α angle with sidewall, it is 150 ° that bevel edge 2 intersects α angle with sidewall, angle α between bevel edge 1 and 2 is also 150 °, the length of bevel edge 1 and 2 is 19.8mm, and crossing angle α all adopts arc transition.

After this chamfer crystallizer copper pipe is reached the standard grade, pulling rate 2.0-2.85m/min.

After adopting the present embodiment, produce the high-carbon alloy steel continuous casting billet corners such as cord steel, prestress wire high-carbon steel, spring steel and do not occur crackle, chamfer site neat appearance, strand qualification rate to reach more than 99.5%, significantly improve cc billet surface quality.

Embodiment 2

Shown in Fig. 2, the present embodiment is applied on certain steel mill's rectangle large square bland continuous-casting machine crystallizer, crystallizer end opening cavity heights h is 300mm, width s is 390mm, length of mould 800mm, for tube type mold, the wall thickness t=12mm of crystallizer copper pipe, tapering 4.0%, mainly produces cord steel, spring steel, bearing steel, high-strength cable steel, alloy tool steel etc.

Chamfering is started from sidewall 4 corner 35mm inward, bevel edge is 3, it is 159.6 ° that bevel edge 1 intersects α angle with sidewall, it is 159.6 ° that bevel edge 2 intersects α angle with sidewall, angle α between bevel edge 3 and 1 and 2 is 155.4 °, and crossing angle α all adopts arc transition, as shown in Figure 5, the length of bevel edge 1 and 2 is 19mm, and the length of bevel edge 3 is 18mm.

After this chamfer crystallizer copper pipe is reached the standard grade, pulling rate 0.60-0.80m/min.

After adopting the present embodiment, produce the high-carbon alloy steel continuous casting billet corners such as cord steel, prestress wire high-carbon steel, spring steel and do not occur crackle, chamfer site neat appearance, strand qualification rate to reach more than 99.0%, significantly improve cc billet surface quality.

In conjunction with shown in Fig. 3 and Fig. 4, respectively the 3rd embodiment and the 4th embodiment, in the 3rd embodiment, the quantity of bevel edge is 4; In the 4th embodiment, the quantity of bevel edge is 5. After adopting these 2 embodiments, strand qualification rate all reaches more than 99.0%.

It should be noted that, in this article, the relational terms of such as first and second or the like is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially. And, term " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that include the process of a series of key element, method, article or equipment not only include those key elements, but also include other key elements being not expressly set out, or also include the key element intrinsic for this process, method, article or equipment. When there is no more restriction, statement " including ... " key element limited, it is not excluded that there is also other identical element in including the process of described key element, method, article or equipment.

The above is only the detailed description of the invention of the application; it should be pointed out that, for those skilled in the art, under the premise without departing from the application principle; can also making some improvements and modifications, these improvements and modifications also should be regarded as the protection domain of the application.

Claims

1. a crystallizer, it is characterised in that between its adjacent the first side wall and the second sidewall, transition has chamfering, this chamfering includes at least two connected bevel edges, and between adjacent described bevel edge, angle is obtuse angle.

2. crystallizer according to claim 1, it is characterised in that: described the first side wall is perpendicular to described second sidewall.

3. crystallizer according to claim 1, it is characterised in that: arc transition between adjacent two described bevel edges,

And/or

Arc transition between the bevel edge that the first side wall is adjacent,

And/or

Arc transition between the bevel edge that second sidewall is adjacent.

4. crystallizer according to claim 1, it is characterised in that: described crystallizer inwall is from suitable for reading to end opening continuous and derivable transition.

5. crystallizer according to claim 1, it is characterized in that: the width of described the first side wall is 100～800mm, the width of described second sidewall is 100～800mm, and the width of described bevel edge is 1～299mm, and the thickness of described the first side wall and the second sidewall is 10～40mm.

6. crystallizer according to claim 1, it is characterised in that: the tapering of crystallizer is 0.4%～10.0%.

7. crystallizer according to claim 1, it is characterised in that: described bevel edge is identical to the thickness of end opening from suitable for reading.

8. crystallizer according to claim 1, it is characterised in that: the surface of described the first side wall and/or the second sidewall is cambered surface or plane.

9. crystallizer according to claim 1, it is characterised in that: the interior wall coating of described crystallizer has chromium, nickel or cobalt alloy.