CN106799481A - The division methods of steel billet are mixed during grade transition - Google Patents
The division methods of steel billet are mixed during grade transition Download PDFInfo
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- CN106799481A CN106799481A CN201611242945.XA CN201611242945A CN106799481A CN 106799481 A CN106799481 A CN 106799481A CN 201611242945 A CN201611242945 A CN 201611242945A CN 106799481 A CN106799481 A CN 106799481A
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- steel
- stove
- molten steel
- mixed
- steel billet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
Abstract
The invention discloses the division methods that steel billet is mixed during a kind of grade transition, including：Using numerical simulation method calculate two kinds of the mixed of molten steel pour situation, calculate from latter stove ladle pull open when, in the concentration levels of the latter stove molten steel in crystallizer exit；The latter stove of chemical analysis according to front and rear two stoves molten steel pulls open time and latter stove Molten steel concentration proportion, calculate the chemical analysis of different time steel billet when latter stove ladle is pulled open, then the standard of two stove steel grades is required according to before and after, the steel billet that latter stove ladle pulls open different time is divided into previous stove molten steel, mixed steel billet and latter stove molten steel, the time period finally according to pulling rate and mixed steel billet calculates the length of mixed steel billet.The present invention can accurately divide the length of mixed steel billet, so as to avoid the performance overstock problem of steel grade, improve the lumber recovery of strand and the comprehensive benefit of product.
Description
Technical field
The present invention relates to a kind of steel billet casting method, specifically, it is related to be mixed during a kind of grade transition the division side of steel billet
Method.
Background technology
Because conventional slab caster kind quantity is increasing, and the amount of ordering of user is smaller, while with tundish refractory material
The raising in life-span makes the casting sequence of tundish gradually increase, and converter develops to maximization direction makes ladleful increasing,
It is higher using individually tissue casting completion production schedule production cost, so used for the close steel grade of steel grade composition even pour,
But produce a number of mixing to pour base, the reasonability of grade transition, feasibility need to just can guarantee that using a reasonably point stove system
And economy.
The content of the invention
Technical problem solved by the invention is to provide a kind of division methods of mixed steel billet during grade transition, can be accurate
The length of mixed steel billet is divided, so as to avoid the performance overstock problem of steel grade, the lumber recovery of strand and the comprehensive effect of product is improve
Benefit.
Technical scheme is as follows：
The division methods of steel billet are mixed during a kind of grade transition, including：
Using numerical simulation method calculate two kinds of the mixed of molten steel pour situation, calculate from latter stove ladle pull open when,
The concentration levels of the latter stove molten steel in crystallizer exit；
The latter stove of chemical analysis according to front and rear two stoves molten steel pulls open time and latter stove Molten steel concentration proportion, calculates
Go out the chemical analysis of different time steel billet when latter stove ladle is pulled open, then the standard of two stove steel grades is required according to before and after, by after
The steel billet that one heat steel bag pulls open different time is divided into previous stove molten steel, mixed steel billet and latter stove molten steel, finally according to pulling rate and
The time period of mixed steel billet calculates the length of mixed steel billet.
Further：Latter stove pulls open the chemical analysis ω of different time steel billetN=ωBefore× (1-AN)+ωAfterwards×AN, ωNFor
The chemical analysis of steel billet when latter stove molten steel pulls open N minutes, is the chemical analysis of previous stove molten steel before ω, is rear one heat steel after ω
The chemical analysis of water, ANLatter stove Molten steel concentration proportion when being pulled open N minutes for latter stove molten steel.
Further：Casting machine is double-current slab caster, and casting blank section is 1810mm × 230mm, and pulling rate is 1m/min.
Compared with prior art, the technology of the present invention effect includes：
1st, the present invention can accurately divide the length of mixed steel billet, so as to avoid the performance overstock problem of steel grade, improve casting
The lumber recovery of base and the comprehensive benefit of product.
2nd, computational methods of the present invention are simple, workable, can accurately divide mixed steel billet during grade transition, reduce
Mixed steel billet length, improves the lumber recovery of strand, has a extensive future.
3rd, the remarkable in economical benefits that the present invention brings.
With carry out within 1 year 100 times it is mixed pour calculatings, it is mixed every time to pour second-rate about 25 tons of reduction altogether due to mixing the accurate division of steel billet
Mixed steel billet, qualified products are calculated with the ton steel price difference of steel scrap with 500 yuan, can create within 1 year 1250000 yuan of benefit.
Specific embodiment
Technical solution of the present invention is elaborated below with reference to example embodiment.However, example embodiment can
Implement in a variety of forms, and be not understood as limited to implementation method set forth herein；Conversely, thesing embodiments are provided so that
The design of example embodiment more comprehensively and completely, and is comprehensively conveyed to those skilled in the art by the present invention.
The division methods of steel billet are mixed during grade transition, is comprised the following steps that：
Step 1：Two kinds of the mixed of molten steel are calculated using the method for numerical simulation and pours situation, calculated and pulled open from latter stove ladle
When, in the concentration levels of the latter stove molten steel in crystallizer exit；
Casting machine is double-current slab caster, and casting blank section is 1810mm × 230mm, and pulling rate is 1m/min, and result of calculation is shown in
Table 1.
The latter stove of table 1 pulls open the concentration levels of different time molten steel
Step 2：The latter stove of chemical analysis according to front and rear two stoves molten steel pulls open time and latter stove Molten steel concentration institute accounting
Example, calculates the chemical analysis of different time steel billet when latter stove ladle is pulled open, and then the standard of two stove steel grades will according to before and after
Ask, the steel billet that latter stove ladle pulls open different time is divided into previous stove molten steel, mixed steel billet and latter stove molten steel, finally according to
The time period of pulling rate and mixed steel billet calculates the length of mixed steel billet.
Embodiment 1
1st, current one heat steel water is S275JR, and latter stove molten steel is S235JR, and two kinds of molten steel mix and poured, and are calculated to mix and are poured base
Length.
2nd, table 2 is the standard requirement of S275JR steel grade chemical analysis, and table 3 will for the standard of S235JR steel grade chemical analysis
Ask.
The standard requirement of the S275JR steel grade chemical analysis of table 2
| Chemical element | C | Si | Mn | P | S | B | Ca |
| The upper limit | 0.20 | 0.025 | 0.70 | 0.013 | 0.010 | 0.0020 | 0.0030 |
| Lower limit | 0.18 | - | 0.60 | - | - | 0.0010 | 0.0010 |
The standard requirement of the S235JR steel grade chemical analysis of table 3
| Chemical element | C | Si | Mn | P | S | B | Ca |
| The upper limit | 0.18 | 0.025 | 0.45 | 0.013 | 0.010 | 0.0020 | 0.0030 |
| Lower limit | 0.16 | - | 0.35 | - | - | 0.0010 | 0.0010 |
3rd, the chemical analysis of previous stove molten steel S275JR is that shown in table 4, the chemical analysis of latter stove molten steel S235JR is table 5
It is shown.
The chemical analysis when S275JR of table 4 is produced
| Chemical element | C | Si | Mn | P | S | B | Ca |
| Previous stove | 0.19 | 0.014 | 0.66 | 0.010 | 0.003 | 0.0014 | 0.0019 |
The chemical analysis when S235JR of table 5 is produced
4th, from table 2 and table 3, there is difference, the mark of other elements in S275JR and S235JR in carbon and manganese element
Alignment request is identical, so only calculating the carbon and manganese element of mixed steel billet.
5th, ω is setNThe chemical analysis of steel billet when pulling open N minutes for latter stove molten steel, be before ω previous stove molten steel chemistry into
Part, it is the chemical analysis of latter stove molten steel, A after ωNLatter stove Molten steel concentration institute accounting when being pulled open N minutes for latter stove molten steel
Example, unit % is specifically shown in Table 1, and computing formula is as follows, and result of calculation is shown in Table 6.
Latter stove pulls open the chemical analysis ω of different time steel billetN=ωBefore× (1-AN)+ωAfterwards×AN。
The latter stove of table 6 pulls open the chemical analysis of different time steel billet
6th, from table 6 result of calculation combination table 2, table 3 steel grade standard requirement, latter stove pull open 3min before strand
It is previous stove S275JR steel grades, it is mixed steel billet to pull open 3min to 10min from latter stove, after being after pulling open 10min from latter stove
One stove S235JR steel grades.
7th, it is mixed steel billet according to 3min to 10min is pulled open from latter stove, the pulling rate of strand is 1m/min, calculates mixed steel billet long
Degree：
(10-3) × 1=7
So mixed steel billet length is 7m.
8th, the length mixed when different steel grades are mixed and poured and pour base can be accurately calculated using this kind of method.
Term used herein is explanation and exemplary and nonrestrictive term.Because the present invention can be with various
Form specific implementation without deviating from invention it is spiritual or substantive, it should therefore be appreciated that above-described embodiment be not limited to it is any foregoing
Details, and widely being explained in the spirit and scope that should be limited in appended claims, thus fall into claim or its etc.
Whole changes and remodeling in the range of effect all should be appended claims and covered.
Claims (3)
1. the division methods of steel billet are mixed during a kind of grade transition, including：
Using numerical simulation method calculate two kinds of the mixed of molten steel pour situation, calculate from latter stove ladle pull open when, crystallization
The concentration levels of the latter stove molten steel in device exit；
The latter stove of chemical analysis according to front and rear two stoves molten steel pulls open time and latter stove Molten steel concentration proportion, after calculating
The chemical analysis of different time steel billet when one heat steel bag is pulled open, then the standard of two stove steel grades is required according to before and after, by latter stove
The steel billet that ladle pulls open different time is divided into previous stove molten steel, mixed steel billet and latter stove molten steel, finally according to pulling rate and mixed steel
The time period of base calculates the length of mixed steel billet.
2. the division methods of steel billet are mixed during grade transition as claimed in claim 1, it is characterised in that：When latter stove pulls open different
Between steel billet chemical analysis ωN=ωBefore× (1-AN)+ωAfterwards×AN, ωNThe chemistry of steel billet when pulling open N minutes for latter stove molten steel
Composition, is the chemical analysis of previous stove molten steel before ω, is the chemical analysis of latter stove molten steel, A after ωNFor latter stove molten steel is pulled open
Latter stove Molten steel concentration proportion at N minutes.
3. the division methods of steel billet are mixed during grade transition as claimed in claim 1, it is characterised in that：Casting machine is that double-current slab connects
Casting machine, casting blank section is 1810mm × 230mm, and pulling rate is 1m/min.
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| CN201611242945.XA CN106799481A (en) | 2016-12-29 | 2016-12-29 | The division methods of steel billet are mixed during grade transition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107368646A (en) * | 2017-07-18 | 2017-11-21 | 包头钢铁（集团）有限责任公司 | A kind of numerical simulation calculation mixes the verification method of steel billet result |
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| WO2015099213A1 (en) * | 2013-12-23 | 2015-07-02 | 주식회사 포스코 | Method for continuously casting different grades of steel |
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| CN107368646A (en) * | 2017-07-18 | 2017-11-21 | 包头钢铁（集团）有限责任公司 | A kind of numerical simulation calculation mixes the verification method of steel billet result |
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Application publication date: 20170606 |