CN105921709A - Definition method for head and tail blanks of pipeline steel - Google Patents

Definition method for head and tail blanks of pipeline steel Download PDF

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Publication number
CN105921709A
CN105921709A CN201610537592.XA CN201610537592A CN105921709A CN 105921709 A CN105921709 A CN 105921709A CN 201610537592 A CN201610537592 A CN 201610537592A CN 105921709 A CN105921709 A CN 105921709A
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base
head
tons
tail
steel
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CN201610537592.XA
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CN105921709B (en
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翟冬雨
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16Controlling or regulating processes or operations
    • B22D11/20Controlling or regulating processes or operations for removing cast stock

Abstract

The invention discloses a definition method for head and tail blanks of pipeline steel. According to the method, inclusions and internal looseness which influence performance are solved at the beginning, water immersion flaw detection tests are conducted on the head and tail blanks of different tonnages, inclusion content analysis is conducted on aspeck, and finally the causes of quality differences of the head and tail blanks are found; and the head and tail blanks of the pipeline steel are finally determined in the manner of defining tonnages and lengths together. It is determined that the head blank cutting should not be lower than 25 t; and the tail blank cutting should not be lower than 30t and should not be shorter than 6.5 m. According to the definition method, scientific tests and reasonable process adjustment are conducted on the basis of previous head and tail blank definition, the reasonable number of the head and tail blanks is formulated, the overall yield of the head and tail blanks is decreased, and the overall pipeline steel quality is improved.

Description

A kind of confining method of pipe line steel base end to end
Technical field
The invention belongs to field of metallurgy, relate to a kind of accurate definition method of continuous-cast blank constant product quality, the confining method of a kind of pipe line steel end to end base high to internal prescription.
Background technology
In recent years, fast development along with oil-gas transportation industry, market is more and more stricter to pipe line steel prescription, the most serious along with the market competition, reduction production cost, raising product quality are more and more important to enterprise, therefore, definition pipe line steel base end to end is most important with the manufacturing cost reducing pipe line steel to the product quality of pipe line steel accurately.
Continuous casting base end to end refers to the part end to end at field of metallurgy continuous casting steel machine operation strand, due to open water, the specific operation of the base that finishes up, the head-tail of whole group of strand is divided into the part that in whole group of strand, quality is worst, in pipe line steel, end to end base can only demote change the original sentence to rolling other steel grade.Traditional confining method of base end to end is defined according to charge length, current domestic steel mill substantially adopts and is defined in this way, base is internal soundness with the main distinction of normal blank end to end, primary evaluation index is field trash and underbead crack, loosens, and operates internal soundness impact predominantly open casting operation with the base that finishes up.
A base 6000mm it is defined as end to end before base confining method, tail base up to 9900mm, 3# machine thick-wall pipeline is by the longest section calculation 320*2570mm, head base weight is about 40 tons, and tail base weight is about 80 tons, end to end base gross weight 120 tons, about nearly 1 stove steel, bring the biggest worry, average 1 group of steel to only have 6 stoves product first-time qualification rate, strand recovery rate, cost calculation, just have the weight of nearly 1 stove steel to change the original sentence to because of base degradation end to end;, less than 20 tons, the most repeatedly there is the underproof quality objection of internal soundness in the local tonnage of 1# machine, 2# machine section heat narrow, thin time tail base 10000mm, brings loss to Nangang and also brings hidden danger to user.
The present invention is mainly by reasonably having formulated the confining method of base end to end on the basis of tackling key problems open casting operation with ending base operation.
Summary of the invention
It is an object of the invention to provide the confining method of a kind of pipe line steel base end to end, solve the problem that quality is conflicting with yield.Affect the factor of pipe line steel internal soundness mainly to open and water when binding with end that to cause shaking irregular interior tissue unstable because of pulling speed of continuous casting change, opened by optimization water, finish up blank technology, decrease because pulling rate changes the impact on product quality, by tonnage is defined with length, solve different section base end to end and define the negative effect to quality, reduce the waste that the many demarcation of base bring end to end simultaneously, 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: the method uses the mode of tonnage and length common definition, finally determines pipe line steel base end to end, specific as follows:
1) head base is during casting, open the process of watering big to the impact of resistance to material, molten steel is initially added into coverture at casting 20 ton hours, secondary oxidation of steel is more serious, because 20 tons of molten steel inner clamps foreign material are more serious before this, opening and water after rear pulling rate reaches regulation pulling rate, the static pressure of strand reaches normal level, therefore internal there is not the loose phenomenon with crackle;Head base solves emphatically degree of purity, is defined as: head base must not cut less than 25 tons;
2) in order to bind during ending base, pulling rate to be gradually reduced, minimum it is down to 0.1m/s, the most constantly carries out wake turbulence when binding, water, it is ensured that top solidifies in time, pulling rate reduces vibration and does not stops, strand core segregation within fan-shaped section, crackle, loose the most serious, ending base is that middle bag, the molten steel amount of crystallizer gradually reduce, and the static pressure that molten steel bears tapers into, having increased the weight of the crackle of tail base, loose phenomenon, therefore flaw detection does not conforms to be the maximum hidden danger of tail base;Tail base solves emphatically underbead crack, loosens, and 25 ~ 30 tons is field trash safety zone, and length 60000 ~ 65000 is underbead crack, loose safety zone, is defined as: trail billet cut must not be less than 30 tons and must not be less than 6.5 meters.
Optimize to open and water ending base technique, open and water tonnage and brought up to 20 tons by 16 tons, middle bag starts to add middle covering agent more than 16 tons, guarantee while avoiding secondary oxidation of steel that field trash has certain floating space, ending base minimum pulling rate is improved to 0.2m/s by 0.1m/s, determines that total duration of pouring is not more than 550 minutes according to middle bag resistance to material amount.
The present invention from affecting the field trash of performance, internal defect is started with and is solved, the base end to end of different tonnages is carried out water logging crank detection test, aspeck carries out inclusion content analysis, finally found that the reason of base mass discrepancy end to end, because opening, the process of watering is big to the impact of resistance to material, molten steel is initially added into coverture at 20 ton hours of casting in the process of casting for head base, secondary oxidation of steel is more serious, because 20 tons of molten steel inner clamps foreign material are more serious before this, open and water after rear pulling rate reaches regulation pulling rate, the static pressure of strand reaches normal level, and therefore internal existence loosens and the phenomenon of crackle;In order to bind during ending base, pulling rate to be gradually reduced, minimum it is down to 0.1m/s, the most constantly carries out wake turbulence when binding, water, it is ensured that top solidifies in time, pulling rate reduces vibration and does not stops, strand core segregation within fan-shaped section, crackle, loose the most serious, ending base is that middle bag, the molten steel amount of crystallizer gradually reduce, and the static pressure that molten steel bears tapers into, having increased the weight of the crackle of tail base, loose phenomenon, therefore flaw detection does not conforms to be the maximum hidden danger of tail base.By different tonnage bases end to end are carried out water logging flaw detection, aspeck inclusion analysis finds, head base solves emphatically degree of purity, 20 ~ 25 tons is safety zone, final head base must not be defined as less than 25 tons, tail base solves emphatically underbead crack, loose, detected a flaw by water logging, aspeck inclusion analysis, 25 ~ 30 tons is field trash safety zone, 60000 ~ 65000 is underbead crack, loose safety zone, therefore, finally determine that pipe line steel base end to end defines: strand is opened and watered crop, after ending base back-end crop, 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.Using tonnage the most still to belong to first with the mode of length common definition the definition of base end to end, such definition i.e. ensure that quality has saved again cost.
The invention has the beneficial effects as follows: according to the practical situation produced, the analysis of science, substantial amounts of verification experimental verification are carried out, the field trash affecting thick-wall pipeline steel and underbead crack, loose situation are carried out qualified evading, the mode using tonnage to combine with length defines, i.e. ensure that Molten Steel Cleanliness improves again internal soundness, reduce the production cost of entirety.
Detailed description of the invention
A kind of confining method of pipe line steel base end to end, the method from affecting the field trash of performance, internal defect is started with and is solved, the base end to end of different tonnages is carried out water logging crank detection test, aspeck carries out inclusion content analysis, finally found that the reason of base mass discrepancy end to end.Use the mode of tonnage and length common definition, finally determine pipe line steel base end to end, be 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 at the first steel mill 2# machine, billet location tail base 10500mm tonnage 26 tons, after rolling, flaw detection does not conforms to, and finds crackle at 1/2 after water logging flaw detection, degradation changes the original sentence to agreement product, is in end to end in the range of base by tonnage definition is the best.
Embodiment 2
This blank is on 06 01st, 2,016 one group of first stove produced at the first steel mill 3# machine, billet location head base 8500mm tonnage 26 tons, and field trash after rolling, flaw detection are the most qualified.
Embodiment 3
This blank is on 02 06th, 2,016 one group of first stove produced at the first steel mill 3# machine, billet location head base 3600mm tonnage 26 tons, and field trash after rolling, flaw detection are the most qualified.
Embodiment 4(1610175632)
This blank is on 03 15th, 2,016 one group of last stove produced at the first steel mill 3# machine, billet location head base 6600mm tonnage 36 tons, and field trash after rolling, flaw detection are the most qualified.

Claims (2)

1. the confining method of a pipe line steel base end to end, it is characterised in that: the method uses the mode of tonnage and length common definition, finally determines pipe line steel base end to end, specific as follows:
1) head base is during casting, open the process of watering big to the impact of resistance to material, molten steel is initially added into coverture at casting 20 ton hours, secondary oxidation of steel is more serious, because 20 tons of molten steel inner clamps foreign material are more serious before this, opening and water after rear pulling rate reaches regulation pulling rate, the static pressure of strand reaches normal level, therefore internal there is not the loose phenomenon with crackle;Head base solves emphatically degree of purity, is defined as: head base must not cut less than 25 tons;
2) in order to bind during ending base, pulling rate to be gradually reduced, minimum it is down to 0.1m/s, the most constantly carries out wake turbulence when binding, water, it is ensured that top solidifies in time, pulling rate reduces vibration and does not stops, strand core segregation within fan-shaped section, crackle, loose the most serious, ending base is that middle bag, the molten steel amount of crystallizer gradually reduce, and the static pressure that molten steel bears tapers into, having increased the weight of the crackle of tail base, loose phenomenon, therefore flaw detection does not conforms to be the maximum hidden danger of tail base;Tail base solves emphatically underbead crack, loosens, and 25 ~ 30 tons is field trash safety zone, and length 60000 ~ 65000 is underbead crack, loose safety zone, is defined as: trail billet cut must not be less than 30 tons and must not be less than 6.5 meters.
The confining method of pipe line steel the most according to claim 1 base end to end, it is characterized in that: open and water tonnage and brought up to 20 tons by 16 tons, middle bag starts to add middle covering agent more than 16 tons, guarantee while avoiding secondary oxidation of steel that field trash has certain floating space, ending base minimum pulling rate is improved to 0.2m/s by 0.1m/s, determines that total duration of pouring is not more than 550 minutes according to middle bag resistance to material amount.
CN201610537592.XA 2016-07-11 2016-07-11 A kind of confining method of pipe line steel base end to end Active CN105921709B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (6)

* Cited by examiner, † Cited by third party
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
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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