CN103008595A - Process for rolling 170 mm specification of flaw detection satisfying steel plate with 300 mm section - Google Patents

Process for rolling 170 mm specification of flaw detection satisfying steel plate with 300 mm section Download PDF

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Publication number
CN103008595A
CN103008595A CN2012105846417A CN201210584641A CN103008595A CN 103008595 A CN103008595 A CN 103008595A CN 2012105846417 A CN2012105846417 A CN 2012105846417A CN 201210584641 A CN201210584641 A CN 201210584641A CN 103008595 A CN103008595 A CN 103008595A
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CN
China
Prior art keywords
flaw detection
heap
steel plate
cooling
strand
Prior art date
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Pending
Application number
CN2012105846417A
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Chinese (zh)
Inventor
朱书成
许少普
赵迪
崔冠军
康文举
乔华伟
刘丹
王新
张少辉
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Nanyang Hanye Special Steel Co Ltd
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Nanyang Hanye Special Steel Co Ltd
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Publication date
Application filed by Nanyang Hanye Special Steel Co Ltd filed Critical Nanyang Hanye Special Steel Co Ltd
Priority to CN2012105846417A priority Critical patent/CN103008595A/en
Publication of CN103008595A publication Critical patent/CN103008595A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a production process for rolling a 170 mm specification of flaw detection satisfying steel plate with a 300 mm section. The process is mainly characterized by comprising the following steps of molten iron desulphurization, furnace converting, argon station, LF refining, continuous casting, cooling in heap, casting blank cleaning, casting blank heating, rolling, cooling in heap, destacking finishing, flaw detection and storage control. The process can overcome the defects in the mould ingot casting production adopted for producing the 170 mm extremely-thick flaw detection satisfying steel plate, has the characteristics of low cost, short flow, high efficiency and low energy consumption, and is matched with the reasonable process route, the reasonable parameters and drawing speed under light pressure, the reasonable casting blank heating time and rolling reduction, the reasonable casting blank cooling in heap and steel plate cooling in heap time, thus, the 170 mm specification of flaw detection satisfying steel plate produced by adopting the 300 mm section meets the level 1 standard of national phi 5 flaw detection, the purpose of cost reduction is realized, and the market competitiveness is improved.

Description

The rolling 170mm specification of a kind of 300mm section is protected flaw detection steel plate technique
Technical field
The invention belongs to the Plate Production technical field, relate to the production that a kind of thin section continuous casting billet replaces ingot casting to produce special thick guarantor's flaw detection steel plate, be specifically related to the rolling 170mm specification of a kind of 300mm section and protect the flaw detection steel plate production technology.
Background technology
At present, domesticly more than 120mm, generally take ingot casting during special thick guarantor's flaw detection steel plate at production specification, utilize the large thickness of ingot casting, large compression ratio to produce special thick guarantor's flaw detection steel plate.But take ingot casting production, steel-making, steel rolling production cycle length, complex process, process energy consumption is high, it is very low to roll rear yield of steel plate, and ton steel production cost is higher, in the situation that iron and steel meagre profit profit is unfavorable for market competition at present.In recent years, development for the market demand and continuous casting process, domestic extra-thick plate blank technique is developed rapidly, the domestic steel mill extra-thick slab casting machine that started successively, utilize extra-thick slab casting machine advanced person's technological equipment progressively to begin to produce the following flaw detection steel plate of protecting of 150mm, with this alternative ingot casting production technology, realized falling this.But when the above specification steel plate of rolling 150mm, domestic producer with extra-thick slab casting machine still relies on ingot casting production, Market competition, and cost is higher, and benefit is lower.
Summary of the invention
In line with shortening the production technology cycle, improve lumber recovery, reducing ton purpose of steel production cost, the applicant sets about studying energetically and takes extra-thick slab casting machine to substitute ingot casting production 170mm specification guarantor flaw detection steel plate, and production technology continued to follow the tracks of, form the complete 300mm section continuous casting billet of a cover and produced the production technology that the 170mm specification is protected flaw detection steel plate.Drawback when this technique can solve and produce the special thick guarantor's flaw detection steel plate of 170mm in the past and take ingot casting to produce, characteristics with low cost, short flow process, high efficiency, low energy consumption, cooperate rational process route, reasonably light reduction parameters and pulling rate, rational strand heat time heating time and rolling drafts, rational strand cooling in heap and steel plate cooling in heap time, make its 170mm specification of taking the production of 300mm section protect the standard that flaw detection steel plate reaches GB ¢ 5 flaw detection one-levels, this purpose falls in realization, improves the market competitiveness.
For achieving the above object, the technical scheme that the present invention takes is that the rolling 170mm specification guarantor of described 300mm section flaw detection steel plate production technology is desulfurizing iron → converter → argon station → LF refining → continuous casting → cooling in heap → strand cleaning → strand heating → rolling → cooling in heap → de-stacking finishing → flaw detection → warehouse-in control; Smelt through converter, LF refining successively behind the desulfurizing iron, improve Molten Steel Cleanliness, then molten steel handling to continuous casting is poured into a mould; The middle Baogang water degree of superheat of in continuous casting, keeping under strict control be controlled at 10~25 ℃, pulling speed of continuous casting according to 0.8m/min control, the strong cold water meter of the two cold 0.61L/Kg of taking, continuous casting take that solidification end is depressed greatly, strand cooling in heap>24h, strand heat time heating time>5h, strand one-pass roller drafts>30mm, steel plate cooling in heap>24h.
It is that 300mm(is thick that the thick 170mm specification of the rolling spy of the present invention is protected the used Cross Section of CC Billet of flaw detection steel plate); The steel grade of indication is the at present domestic external low-alloy Series Steel of producing that reaches, and composition is controlled according to GB.
Beneficial effect of the present invention is: take 300mm section continuous casting billet to substitute ingot casting and produce 170mm specification guarantor flaw detection steel plate, lumber recovery improves more than 21%, ton steel cost reduces about 1000 yuan, greatly reduces production cost.
The specific embodiment
The present invention takes continuous casting billet to produce special thick 170mm specification and protects flaw detection steel plate, described slab thickness is 300mm, produce steel grades according to the GB Composition Control, its production technology is desulfurizing iron → converter → argon station → LF refining → continuous casting → cooling in heap → strand cleaning → strand heating → rolling → cooling in heap → de-stacking finishing → flaw detection → warehouse-in control; Smelt through converter, LF refining successively behind the desulfurizing iron, improve Molten Steel Cleanliness, then molten steel handling to continuous casting is poured into a mould; The middle Baogang water degree of superheat of in continuous casting, keeping under strict control be controlled at 10~25 ℃, pulling speed of continuous casting according to 0.8m/min control, the strong cold water meter of the two cold 0.61L/Kg of taking, continuous casting take that solidification end is depressed greatly, strand cooling in heap>24h, strand heat time heating time>5h, strand one-pass roller drafts>30mm, steel plate cooling in heap>24h.
Production technology main-process stream of the present invention is: desulfurizing iron → converter → argon station → LF refining → continuous casting → strand asbestos parcel cooling in heap → strand cleaning → strand heating → rolling → cooling in heap → de-stacking finishing → flaw detection → warehouse-in control.
Desulphuring Process of Molten Iron: the molten iron that arrives at a station must be taken off front slag and rear slag before entering converter, take powder injection desulphurization in the desulfurization whipping process, ton iron sorbent consumption is controlled at about 9Kg, mixing time is controlled at about 11min, desulfurized molten iron S content is controlled at≤and 0.005%, the desulfurization temperature drop is controlled in 25 ℃.
Converter smelting process: take the top and bottom complex blowing oxygen coverter to smelt, enter stove molten iron S≤0.005%, P≤0.090%, molten iron temperature 〉=1270 ℃; In the converter smelting process rob the position take low, high and low; Slag material is taked lime, light dolomite, magnesium ball, sinter return fine, and slag making basicity is controlled according to 3.0-3.3; Converter smelting endpoint tapping C 〉=0.06%, P≤0.015%, tapping temperature 〉=1640 ℃; Add first deoxidier in the converter tapping process and carry out pre-deoxidation, and then carry out alloying; Slag retaining cone is taked at the tapping end, control thickness of slag layer≤50mm.
The argon station: molten steel is tapped and is added aluminum steel 3m/t steel behind the argon station, upper LF refining leaving from station behind the Argon 3min after adding; Temperature leaving from station is according to 〉=1570 ℃ of controls.
LF refining: take the slag making of large quantity of slag technique, wherein lime adding amount 800-1200Kg/ stove; Slagging agent is taked alumina balls, and addition is controlled at the 100-200Kg/ stove; Deoxidier is taked calcium carbide, ferrosilicon powder, aluminum shot, and addition is as the criterion to guarantee that the slag color bleaches; Retention time 〉=10min after white slag is shaped in the LF refining process, diligent dry slag in the refining process; Rationally control Argon intensity is avoided cruelly blowing; The soft blow argon time was controlled at more than the 15min before refining finished continuous casting leaving from station, and upper casting temperature leaving from station guarantees that the middle Baogang water degree of superheat is controlled at 10-25 ℃.
Continuous casting: take omnidistance argon envelope protection cast, avoid secondary oxidation of steel; Take the cast of 0.8m/min constant speed in the continuous casting, the middle Baogang water degree of superheat is according to 10-25 ℃ of control; Continuous casting two cold is taked the strong cold water meter of 0.61L/Kg; Solidification end takes two ends to depress greatly, and according to 2.5mm, 2.7mm control, according to category-B 0.5 grade or more control respectively by the strand low multiple quality for drafts.
Cooling in heap: take asbestos parcel cooling in heap after the strand cutting, the cooling in heap time is fully realized the purpose that H is taken off in the diffusion of strand cooling in heap according to>24h control.
Strand cleaning: after the strand cooling in heap finishes, carry out strand surfaces externally and internally cleaning check, prevent that slab surface crack from occuring.
Strand heating: strand heats in heating furnace, and control according to 10-12min/cm heat time heating time, guarantees to be controlled at>5h total heat time heating time, guarantees that strand grills thoroughly;
Strand is rolling: take the large soft reduction process of high temperature low speed to be rolled in the strand operation of rolling, the single pass drafts is controlled at>30mm, takes full advantage of to depress greatly to realize strand internal defect pressing elimination.
Steel plate cooling in heap: take behind the steel plate rolling fully to realize the purpose of diffusion elimination internal stress into hole insulation slow cooling>24h.
After finishing, the steel plate cooling in heap after de-stacking finishing, flaw detection, puts in storage successively.
Strand according to this explained hereafter is rolled rear steel plate take the JB/T4730.3-2005 non-destructive testing standard to carry out nondestructive inspection, the result meets ¢ 5 flaw detection primary standards.
Technique of the present invention has overcome production cycle length when in the past taking ingot casting to produce special thick guarantor's flaw detection steel plate, complex process, the process energy consumption is high, lumber recovery is low drawback, greatly shorten the production cycle, improved the steel plate rolling lumber recovery, greatly reduced a ton steel production cost.This technological operation is simple, with short production cycle, energy consumption is low, is convenient to promote in large production, can be widely used in the special thick guarantor's flaw detection steel plate manufacturing of domestic extra-thick plate blank manufacturer.

Claims (1)

1. the rolling 170mm specification of 300mm section is protected the flaw detection steel plate production technology, and this technique is desulfurizing iron → converter → argon station → LF refining → continuous casting → cooling in heap → strand cleaning → strand heating → rolling → cooling in heap → de-stacking finishing → flaw detection → warehouse-in control; It is characterized in that smelting through converter, LF refining successively behind the desulfurizing iron, improve Molten Steel Cleanliness, then molten steel handling to continuous casting is poured into a mould; The middle Baogang water degree of superheat of in continuous casting, keeping under strict control be controlled at 10~25 ℃, pulling speed of continuous casting according to 0.8m/min control, the strong cold water meter of the two cold 0.61L/Kg of taking, continuous casting take that solidification end is depressed greatly, strand cooling in heap>24h, strand heat time heating time>5h, strand one-pass roller drafts>30mm, steel plate cooling in heap>24h.
CN2012105846417A 2012-12-30 2012-12-30 Process for rolling 170 mm specification of flaw detection satisfying steel plate with 300 mm section Pending CN103008595A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104532127A (en) * 2014-12-24 2015-04-22 首钢总公司 Method for producing steel for pipe fittings and steel for pipe fittings
CN108048625A (en) * 2017-12-14 2018-05-18 南阳汉冶特钢有限公司 A kind of production technology for reducing hot-loading and hot-conveying billet rolling steel plate crackle
CN108145110A (en) * 2017-11-24 2018-06-12 南阳汉冶特钢有限公司 It is a kind of to reduce the cracked production technology of billet rolling steel plate

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104532127A (en) * 2014-12-24 2015-04-22 首钢总公司 Method for producing steel for pipe fittings and steel for pipe fittings
CN108145110A (en) * 2017-11-24 2018-06-12 南阳汉冶特钢有限公司 It is a kind of to reduce the cracked production technology of billet rolling steel plate
CN108145110B (en) * 2017-11-24 2019-11-22 南阳汉冶特钢有限公司 It is a kind of to reduce the cracked production technology of billet rolling steel plate
CN108048625A (en) * 2017-12-14 2018-05-18 南阳汉冶特钢有限公司 A kind of production technology for reducing hot-loading and hot-conveying billet rolling steel plate crackle
CN108048625B (en) * 2017-12-14 2019-06-18 南阳汉冶特钢有限公司 A kind of production technology reducing hot-loading and hot-conveying billet rolling steel plate crackle

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Application publication date: 20130403