CN105921709B - A kind of confining method of pipe line steel base end to end - Google Patents
A kind of confining method of pipe line steel base end to end Download PDFInfo
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- CN105921709B CN105921709B CN201610537592.XA CN201610537592A CN105921709B CN 105921709 B CN105921709 B CN 105921709B CN 201610537592 A CN201610537592 A CN 201610537592A CN 105921709 B CN105921709 B CN 105921709B
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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
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
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Abstract
The invention discloses a kind of confining method of pipe line steel base end to end, field trash, the internal defect of this method from influence performance, which are started with, to be solved, water logging crank detection test, aspeck progress inclusion content analyses are carried out to the base end to end of different tonnages, the reason for having finally found that base mass discrepancy end to end, by the way of tonnage and length common definition, it is final to determine pipe line steel base end to end, it is defined as：Head base must not cut less than 25 tons；Trail billet cut must not be less than 30 tons and must not be less than 6.5 meters.The present invention carries out the experiment of science on the basis of base is defined end to end in the past, and reasonable process adjustment has formulated rational base quantity end to end, reduced the overall yield of base end to end, improve overall pipeline steel quality.
Description
Technical field
The invention belongs to field of metallurgy, it is related to a kind of accurate definition method of continuous-cast blank product quality stability, specifically
Say be a kind of pipe line steel high to internal quality requirement base end to end confining method.
Background technology
In recent years, with the fast development of oil-gas transportation industry, market is more and more stricter to pipe line steel quality requirement, with
Market competition it is increasingly serious, reduction production cost, to improve product quality more and more important to enterprise, therefore, accurately definition
Base is most important to the product quality and the manufacturing cost of reduction pipe line steel of pipe line steel end to end for pipe line steel.
Base refers in the part end to end of field of metallurgy continuous casting steel machine process strand continuous casting end to end, due to open pour, finish up base
Specific operation, the head-tail of whole group strand is divided into the worst part of quality in whole group strand, and in pipe line steel, base can only drop end to end
Level changes the original sentence to the other steel grades of rolling.Traditional confining method of base end to end is defined according to charge length, at present steel mill of the country
Substantially it is defined in this way, the main distinction of base and normal blank is internal soundness end to end, and primary evaluation index is
It is field trash and underbead crack, loose, it is mainly open casting operation and ending base operation on internal soundness influence.
A base 6000mm, tail base up to 9900mm are defined as before base confining method end to end, 3# machines thick-wall pipeline is by most
Long section calculation 320*2570mm, head base weight is about 40 tons, and tail base weight is about 80 tons, end to end 120 tons of base gross weight, will
Nearly 1 stove steel or so, very big worry is brought to product first-time qualification rate, strand recovery rate, cost calculation, and average 1 group of steel only has 6
Stove, just has the weight of nearly 1 stove steel to be changed the original sentence to because base end to end degrades；1# machines, 2# machines are narrow, thin section heat time tail base 10000mm
Local tonnage repeatedly occurs the underproof quality objection of internal soundness less than 20 tons, once, and loss is brought also to user to Nangang
Bring hidden danger.
It is of the invention main by open casting operation and the rational base end to end formulated on the basis of ending base operation tackling key problem
Confining method.
The content of the invention
It is an object of the invention to provide a kind of confining method of pipe line steel base end to end, quality is solved conflicting with yield
The problem of.The factor of influence pipe line steel internal soundness, which is mainly to open, to be poured when being bound with end because pulling speed of continuous casting change causes vibrations not
Rule interior tissue is unstable, opened by optimization pour, finish up blank technology, reduce because of influence of the pulling rate change to product quality,
By being defined to tonnage and length, solving different section, base defines negative effect to quality end to end, while reducing end to end
Demarcate the waste brought more base, reduce production cost.
The purpose of the present invention is achieved through the following technical solutions：
A kind of confining method of pipe line steel base end to end, it is characterised in that：This method is using tonnage and length common definition
Mode, finally determines pipe line steel base end to end, specific as follows：
1）Head base opens the process of pouring and impacts big to resistance to material during casting, and molten steel is initially added into 20 ton hours of casting to be covered
Lid agent, secondary oxidation of steel is more serious, therefore preceding 20 tons of molten steel inner clamps debris is more serious, opens and pours rear pulling rate and reach regulation pulling rate
Afterwards, the static pressure of strand reaches normal level, therefore internal in the absence of the loose phenomenon with crackle；It is pure that head base focuses on solution
Degree, is defined as：Head base must not cut less than 25 tons；
2）In order to bind during ending base, pulling rate is gradually reduced, it is minimum to be down to 0.1m/s, also constantly stirred when binding
Flow, water, it is ensured that top solidifies in time, pulling rate reduction vibration does not stop, it is the segregation of strand core, crackle inside fan-shaped section, loose
Substantially serious, ending base is that middle bag, the molten steel amount of crystallizer are gradually reduced, and the static pressure that molten steel is born is tapered into, and is aggravated
The crackle of tail base, loose phenomenon, therefore it is the maximum hidden danger of tail base that flaw detection, which does not conform to,；Tail base focuses on to solve underbead crack, loose,
25 ~ 30 tons are field trash safety zone, and length 60000 ~ 65000 is underbead crack, loose safety zone, is defined as：Tail base is cut
Must not cut less than 30 tons and must not be less than 6.5 meters.
Optimization, which is opened, pours ending base technique, opens and pours tonnage and bring up to 20 tons by 16 tons, middle bag start more than 16 tons plus in cladding
Lid agent, it is to avoid ensure that field trash has certain floating space while secondary oxidation of steel, the minimum pulling rate of ending base is by 0.1m/s
Improve to 0.2m/s, determine that total duration of pouring is not more than 550 minutes according to the middle resistance to material amount of bag.
Field trash, the internal defect of the present invention from influence performance, which are started with, to be solved, and the base end to end of different tonnages is carried out
Water logging crank detection test, aspeck progress inclusion content analyses, the reason for having finally found that base mass discrepancy end to end, head base is being poured
The process of casting impacts big, molten steel to resistance to material in 20 ton hours of casting because opening the process of pouring and is initially added into coverture, secondary oxidation of steel compared with
Seriously, therefore preceding 20 tons of molten steel inner clamps debris is more serious, open and pour rear pulling rate and reach after regulation pulling rate, the static pressure of strand reaches
Normal level, thus it is internal in the absence of the loose phenomenon with crackle；In order to bind during ending base, pulling rate is gradually reduced, it is minimum
0.1m/s is down to, wake turbulence is also constantly carried out when binding, is watered, it is ensured that top solidifies in time, pulling rate reduction vibration does not stop, fan-shaped
The strand core segregation of intersegmental part, crackle, loose substantially serious, ending base is that middle bag, the molten steel amount of crystallizer are gradually reduced, steel
The static pressure that water is born is tapered into, and has aggravated the crackle of tail base, loose phenomenon, therefore it is the hidden of tail base maximum that flaw detection, which does not conform to,
Suffer from.By the way that to different tonnages, base carries out water logging flaw detection, the discovery of aspeck inclusion analysis end to end, head base focuses on to solve degree of purity,
20 ~ 25 tons are safety zone, and final head base must not be defined as less than 25 tons, and tail base focuses on to solve underbead crack, loose, passes through water
Leaching flaw detection, aspeck inclusion analysis, 25 ~ 30 tons are field trash safety zone, and 60000 ~ 65000 be underbead crack, loose peace
It is region-wide, it is therefore, final to determine that base is defined pipe line steel end to end：Strand, which is opened, to be poured after crop, ending base back-end crop, and head base must not cut low
In 25 tons, trail billet cut must not be less than 30 tons and must not be less than 6.5 meters.To the definition of base end to end using tonnage and length common definition
Mode still belong to first at home, so definition i.e. ensure that quality has saved cost again.
The beneficial effects of the invention are as follows：According to the actual conditions of production, the analyzing of science carried out, substantial amounts of tested
Card, to influence thick-wall pipeline steel field trash and underbead crack, loose situation carry out it is qualified evade, mutually tied with length using tonnage
The mode of conjunction is defined, that is, ensure that Molten Steel Cleanliness improves internal soundness again, reduces overall production cost.
Embodiment
A kind of confining method of pipe line steel base end to end, field trash, the internal defect of this method from influence performance are started with progress
Solve, water logging crank detection test, aspeck progress inclusion content analyses are carried out to the base end to end of different tonnages, head has been finally found that
The reason for tail base mass discrepancy.It is final to determine pipe line steel base end to end by the way of tonnage and length common definition, it is defined as：
Head base must not cut less than 25 tons；Trail billet cut must not be less than 30 tons and must not be less than 6.5 meters.
Embodiment 1
This blank is on 03 24th, 2,015 one group of last stove produced in the first steel mill 2# machines, billet location tail base
26 tons of 10500mm tonnages, flaw detection does not conform to after rolling, crackle at 1/2 is found after water logging flaw detection, degradation changes the original sentence to agreement product, by tonnage
True benefit is defined in the range of base end to end.
Embodiment 2
This blank is on 06 01st, 2,016 one group of first stove produced in the first steel mill 3# machines, billet location head base
26 tons of 8500mm tonnages, field trash, flaw detection are qualified after rolling.
Embodiment 3
This blank is on 02 06th, 2,016 one group of first stove produced in the first steel mill 3# machines, billet location head base
26 tons of 3600mm tonnages, field trash, flaw detection are qualified after rolling.
Embodiment 4（1610175632）
This blank is on 03 15th, 2,016 one group of last stove produced in the first steel mill 3# machines, billet location head base
36 tons of 6600mm tonnages, field trash, flaw detection are qualified after rolling.
Claims (2)
1. a kind of confining method of pipe line steel base end to end, it is characterised in that：This method uses the side of tonnage and length common definition
Formula, finally determines pipe line steel base end to end, specific as follows：
1）Head base opens the process of pouring and impacts big to resistance to material, molten steel is initially added into coverture in 20 ton hours of casting during casting,
Secondary oxidation of steel is more serious, therefore preceding 20 tons of molten steel inner clamps debris is more serious, opens and pours rear pulling rate and reach after regulation pulling rate, casts
The static pressure of base reaches normal level, therefore internal in the absence of the loose phenomenon with crackle；Head base focuses on to solve degree of purity, it is determined that
For：Head base must not cut less than 25 tons；
2）Finish up base when in order to bind, to gradually reduce pulling rate, it is minimum to be down to 0.1m/s, when binding also constantly carry out wake turbulence,
Water, it is ensured that top solidifies in time, pulling rate reduction vibration does not stop, the segregation of strand core, crackle inside fan-shaped section, it is loose substantially
Seriously, ending base be it is middle bag, the molten steel amount of crystallizer gradually reduce, the static pressure that molten steel is born is tapered into, and has aggravated tail base
Crackle, loose phenomenon, therefore it is the maximum hidden danger of tail base that flaw detection, which does not conform to,；Tail base focuses on to solve underbead crack, loose, 25 ~
30 tons are field trash safety zone, and length 6000mm ~ 6500mm is underbead crack, loose safety zone, is defined as：Trail billet cut
Must not less than 30 tons and must not be less than 6.5 meters.
2. the confining method of pipe line steel according to claim 1 base end to end, it is characterised in that：Open and pour tonnage by 16 tons of raisings
To 20 tons, middle bag starts plus middle covering agent more than 16 tons, it is to avoid ensure that field trash has while secondary oxidation of steel certain
Floating space, the minimum pulling rate of ending base is improved to 0.2m/s by 0.1m/s, and total duration of pouring is determined not according to the middle resistance to material amount of bag
More than 550 minutes.
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| CN201610537592.XA CN105921709B (en) | 2016-07-11 | 2016-07-11 | A kind of confining method of pipe line steel base end to end |
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| CN105921709B true CN105921709B (en) | 2017-10-27 |
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| CN108453226A (en) * | 2017-02-22 | 2018-08-28 | 本钢板材股份有限公司 | A kind of rectangle steel billet back-end crop control method |
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| SU1375404A1 (en) * | 1986-09-16 | 1988-02-23 | Производственное объединение "Уралмаш" | Arrangement for separating and removing flexible dummy bar |
| CN102371284A (en) * | 2011-10-30 | 2012-03-14 | 山西太钢不锈钢股份有限公司 | Dual-descaling method for hot rolling strip steel slab |
| CN102899559A (en) * | 2012-10-12 | 2013-01-30 | 吉林建龙钢铁有限责任公司 | Preparation method of steel for oil delivery pipeline |
| CN103252347A (en) * | 2012-02-21 | 2013-08-21 | 宝山钢铁股份有限公司 | Continuous cast slab head and tail shape pre-controlling method capable of reducing hot-rolled intermediate slab head and tail cutting quantities |
| CN103586433A (en) * | 2013-11-04 | 2014-02-19 | 南京钢铁股份有限公司 | Method for increasing flaw detection yield of continuous casting sheet head billet and tail billet |
| CN103706775A (en) * | 2013-12-13 | 2014-04-09 | 内蒙古包钢钢联股份有限公司 | Operation method for simultaneously casting secondary and special steel type long continuous castings through continuous casting machine for wide and thick plates |
-
2016
- 2016-07-11 CN CN201610537592.XA patent/CN105921709B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1375404A1 (en) * | 1986-09-16 | 1988-02-23 | Производственное объединение "Уралмаш" | Arrangement for separating and removing flexible dummy bar |
| CN102371284A (en) * | 2011-10-30 | 2012-03-14 | 山西太钢不锈钢股份有限公司 | Dual-descaling method for hot rolling strip steel slab |
| CN103252347A (en) * | 2012-02-21 | 2013-08-21 | 宝山钢铁股份有限公司 | Continuous cast slab head and tail shape pre-controlling method capable of reducing hot-rolled intermediate slab head and tail cutting quantities |
| CN102899559A (en) * | 2012-10-12 | 2013-01-30 | 吉林建龙钢铁有限责任公司 | Preparation method of steel for oil delivery pipeline |
| CN103586433A (en) * | 2013-11-04 | 2014-02-19 | 南京钢铁股份有限公司 | Method for increasing flaw detection yield of continuous casting sheet head billet and tail billet |
| CN103706775A (en) * | 2013-12-13 | 2014-04-09 | 内蒙古包钢钢联股份有限公司 | Operation method for simultaneously casting secondary and special steel type long continuous castings through continuous casting machine for wide and thick plates |
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