CN102251181A - Steelmaking refining and continuous casting production method for alloy casting blank - Google Patents

Steelmaking refining and continuous casting production method for alloy casting blank Download PDF

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Publication number
CN102251181A
CN102251181A CN2011101897311A CN201110189731A CN102251181A CN 102251181 A CN102251181 A CN 102251181A CN 2011101897311 A CN2011101897311 A CN 2011101897311A CN 201110189731 A CN201110189731 A CN 201110189731A CN 102251181 A CN102251181 A CN 102251181A
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CN
China
Prior art keywords
converter
weight percentage
steel
refining
continuous casting
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Pending
Application number
CN2011101897311A
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Chinese (zh)
Inventor
李峰
金文俊
贺景春
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Baotou Iron and Steel Group Co Ltd
Inner Mongolia Baotou Steel Union Co Ltd
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Baotou Iron and Steel Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Baotou Iron and Steel Group Co Ltd filed Critical Baotou Iron and Steel Group Co Ltd
Priority to CN2011101897311A priority Critical patent/CN102251181A/en
Publication of CN102251181A publication Critical patent/CN102251181A/en
Pending legal-status Critical Current

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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention relates to a steelmaking refining and continuous casting production method for alloy casting blanks. The invention is characterized in that: 1) the chemical components of steel comprise 0.10 to 0.15 wt% of carbon, 0.30 to 0.50 wt% of silicon, 0.30 to 0.60 wt% of manganese, 4.0 to 6.0 wt% of chromium, 0.45 to 0.60 wt% of molybdenum, no more than 0.030 wt% of phosphor and no more than 0.030 wt% of sulfur, with the balance being iron; 2) amount of roughing slag of a converter is controlled to be no more than 50 mm; 3) under the production condition that tapping amount of the converter is 100 t, addition of ferrochromium at the station of the converter is 3 to 5 t; 4) total time for treatment in a ladle furnace (LF) refining is 59 to 95 minutes; 5) under the condition that the fracture surface of the casting blank is Phi 270 mm, the speed of continuous casting is in a range of 0.7 m/min to 1.4 m/min. The advantages of the invention are as follows: the method enables alloy casting blanks with qualified quality to be produced and economic benefits for enterprises and added values of the product to be improved.

Description

A kind of steel-making refining and continuous casting producing method of alloy strand
Technical field
The present invention relates to a kind of steel-making refining and continuous casting producing method of alloy strand, belong to the field of steel-making that metallurgical industry is produced.
Background technology
The cracking of oil seamless tube is the steel pipe that the boiler tube, heat exchanger tube and the pipeline that are used for petrochemical industry used, generally with soft steel or molybdenum group alloy material tubulation, requirement can bear that high temperature and 15MPa are with upward pressure more than 400 ℃, and various performance index are had relatively high expectations, and the production difficulty is big.The 1Cr5Mo alloy seamless steel pipe has better mechanical property and erosion resistance, various performance index such as the yield strength of this steel pipe, the tension limit, elongation, ballistic work and erosion resistance all are above standard to the requirement of oil refinery device with tubing, meeting user's service requirements, is one of main steel grade of cracking of oil seamless tube.
For improving added value of product, Baotou Iron and Steel Company has carried out the exploitation of this steel grade.
Summary of the invention
The object of the present invention is to provide a kind of steel-making refining and continuous casting producing method of alloy strand, this method can be produced chemical ingredients and the qualified alloy pipe stock of slab quality.
Technical solution:
Its technical characterictic is: the 1. chemical ingredients of steel: the weight percentage of carbon is that the weight percentage of 0.10-0.15%, silicon is that the weight percentage of 0.30-0.50%, manganese is that the weight percentage of 0.30-0.60%, chromium is that the weight percentage of 4.0-6.0%, molybdenum is that the weight percentage of 0.45-0.60%, phosphorus is no more than 0.030%, the weight percentage of sulphur is no more than 0.030%, and surplus is an iron; 2. control that the quantity of slag is no more than 50mm under the converter; 3. the converter tapping amount is under the production prerequisite of 100t, and ferrochrome adds 3-5t at the converter station; 4. refining LF stove processing total time is 59-95min; 5. casting blank section is under the situation of φ 270mm, and the continuous casting pulling rate is in the scope of 0.7m/min-1.4m/min.
Advantage of the present invention is: use this method and can produce up-to-standard alloy strand, improved economic benefit of enterprises and added value of product.
Embodiment
(1) converter smelting
This trial production has successively been carried out 27 stoves altogether, and table 1 is converter molten iron, steel scrap Intake Quantity situation.Table 2 is for stove molten iron (having passed through hot metal pretreatment) is gone in converter, molten steel composition and temperature when once falling stove and tapping.Converter terminal controlled target: (w%) P≤0.015%, (w%) S≤0.030%.Add ferrochrome 2-3t before the tapping in the ladle jar, all the other ferrochrome add (1-2t) by high hopper in tapping process.Because alloy addition is big, for fear of causing composition offscale, so use the extra low carbon ferrochromium of C≤0.10%, Cr 〉=60% because carbon is brought in the alloy adding into.Because converter need add more alloy, the liquid steel temperature of converter tapping improves 30-40 ℃ than common (being generally 1630-1650 ℃).In addition, the pushing off the slag tapping to be no more than 50mm with the quantity of slag under the strictness control.Molten steel composition described in the following form all is a weight percentage.
Table 1 converter molten iron and the steel scrap situation of packing into
Iron water amount, t The steel scrap amount, t Total Intake Quantity, t
Minimum value 84 14.7 98.7
Maximum value 93.4 15.8 109.2
Mean value 90.8 15.4 106.2
Table 2 hot metal composition, temperature and the converter condition of production
C,% Mn,% P,% S,% Temperature, ℃
Go into stove iron level average 0.44 0.59 0.108 0.030 1274
The mean value of falling the stove once 0.099 0.19 0.018 0.022 1620
Tapping mean value 0.087 0.145 0.014 0.021 1674
(2) the LF refining furnace is produced
Table 3 is the variation of molten steel composition in the refining treatment process, and as can be seen, molten steel is higher at the desulfurization degree of refining station, and mean value reaches 67%.In addition, from table 3 changing conditions of phosphorus as can be known, converter tapping quantity of slag control at present is good, does not occur the rephosphorization phenomenon basically.Table 4 is the processing parameter in the refining treatment process, and data can find out that LF stove heat-up time and refining treatment time are all longer from table, and this is because the higher cause of molten steel alloy content.
In place and the composition of offing normal of table 3 refining LF stove, w%
Processing parameter in the table 4 LF stove refining production process
(3) the VD refining furnace is produced
By table 5 as seen, the dark vacuum time of VD stove is all greater than 15min, and the soft blow time after the VD stove is all greater than 10min.
Processing parameter in the table 5 VD stove production process
Dark vacuum time, min Dark vacuum tightness, KPa The soft blow time, min The soft blow flow, Nl/min
Minimum value 15 0.032 10 50
Maximum value 16 0.042 27 60
Mean value 15.2 0.037 12.4 52.4
(4) the continuous caster condition of production
The section of strand adopts φ 270mm in the production, because this steel grade alloy content height, the strand crack sensitivity is strong, and the bleed-out probability increases in the production, and therefore the pulling rate of 27 stove steel of trial-production is all lower, and the scope of pulling rate is in the scope of 0.7m/min~1.4m/min.The other reasons that pulling rate is low: the first, because the refining treatment time is long, consider the matching problem of sequential; The second, because the alloy content height, the cutting needed time of strand is longer.The superheating temperature span of control of this steel grade is 26-35 ℃.The steel grade finished product chemical ingredients that table 6 obtains for the tundish sampling.
The chemical Composition Control situation of table 6 finished product 1Cr5Mo steel, w%
C Si Mn P S Cr Mo
Minimum value 0.12 0.41 0.40 0.011 0.003 4.21 0.48
Maximum value 0.15 0.49 0.52 0.018 0.010 4.39 0.51
Mean value 0.13 0.43 0.46 0.014 0.007 4.29 0.49
(5) strand check
Strand has been carried out sulfur print test, and the result is as shown in table 7, and by table 7 as seen, slab quality is good, and except that 0 grade of ratio of centre burst is 40.7%, other defective all is 0 grade (rank is low more, and quality is good more).Make because the used round base casting machine of continuous casting is a German De Make company, so the sufur printing result is according to being the DEMAG picture of grading.
Table 7 strand sulfur print test result (N=27)

Claims (1)

1. the steel-making refining and the continuous casting producing method of an alloy strand, it is characterized in that: the 1. chemical ingredients of steel: the weight percentage of carbon is that the weight percentage of 0.10-0.15%, silicon is that the weight percentage of 0.30-0.50%, manganese is that the weight percentage of 0.30-0.60%, chromium is that the weight percentage of 4.0-6.0%, molybdenum is that the weight percentage of 0.45-0.60%, phosphorus is no more than 0.030%, the weight percentage of sulphur is no more than 0.030%, and surplus is an iron; 2. control that the quantity of slag is no more than 50mm under the converter; 3. the converter tapping amount is under the production prerequisite of 100t, and ferrochrome adds 3-5t at the converter station; 4. refining LF stove processing total time is 59-95min; 5. casting blank section is under the situation of φ 270mm, and the continuous casting pulling rate is in the scope of 0.7m/min-1.4m/min.
CN2011101897311A 2011-06-25 2011-06-25 Steelmaking refining and continuous casting production method for alloy casting blank Pending CN102251181A (en)

Priority Applications (1)

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CN102251181A true CN102251181A (en) 2011-11-23

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105945250A (en) * 2016-05-30 2016-09-21 内蒙古包钢钢联股份有限公司 Method for improving internal quality of high-alloy steel billet
CN106319135A (en) * 2016-11-24 2017-01-11 新兴铸管股份有限公司 Method for preventing C and Mn element composition fluctuation by smelting process

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101086203A (en) * 2007-07-19 2007-12-12 天津钢铁有限公司 Method for producing continuous casting round billet for petroleum bush using convertor process
CN101446180A (en) * 2008-11-06 2009-06-03 天津钢铁有限公司 Round blank for high-steel level oil bushing and manufacturing process

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101086203A (en) * 2007-07-19 2007-12-12 天津钢铁有限公司 Method for producing continuous casting round billet for petroleum bush using convertor process
CN101446180A (en) * 2008-11-06 2009-06-03 天津钢铁有限公司 Round blank for high-steel level oil bushing and manufacturing process

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
《中华人民共和国国家标准GB9948-2006》 20060816 中华人民共和国国家质量监督检验检疫总局中国国家标准化管理委员会 石油裂化用无缝钢管 第4页 1 , *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105945250A (en) * 2016-05-30 2016-09-21 内蒙古包钢钢联股份有限公司 Method for improving internal quality of high-alloy steel billet
CN106319135A (en) * 2016-11-24 2017-01-11 新兴铸管股份有限公司 Method for preventing C and Mn element composition fluctuation by smelting process
CN106319135B (en) * 2016-11-24 2018-05-29 新兴铸管股份有限公司 The method that the fluctuation of C, Mn elemental composition is prevented for smelting process

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Application publication date: 20111123