CN107385142B - A kind of smelting process of high strength low carbon bainibic steel - Google Patents

A kind of smelting process of high strength low carbon bainibic steel Download PDF

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Publication number
CN107385142B
CN107385142B CN201710514782.4A CN201710514782A CN107385142B CN 107385142 B CN107385142 B CN 107385142B CN 201710514782 A CN201710514782 A CN 201710514782A CN 107385142 B CN107385142 B CN 107385142B
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content
slag
steel
low
tapping
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CN107385142A (en
Inventor
孟保仓
何建中
宋海
张怀军
刘岩军
郝振宇
陈建新
张达先
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Baotou Iron and Steel Group Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/068—Decarburising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

The present invention relates to the smelting process for disclosing a kind of high strength low carbon bainibic steel, and the molten iron that in turn includes the following steps pretreatment: using the desulfurization of KR method, obtains low-phosphorous, the low-sulfur molten iron of P≤0.110%, S≤0.005%, temperature T >=1250 DEG C；Converter smelting: using double slag-remaining slag operations, tapping temperature control carries out alloying using ferrosilicon, low-carbon ferromanganese in 1620-1650 DEG C, tapping process, and deep deoxidation uses al-free deoxidation, and using slide plate pushing off the slag, 3kg/ tons of steel top slag limes are added after tapping；LF refining；VD is refined: deep vacuum time >=15 minute of holding, deep vacuum degree≤80Pa, and soft blow time >=30 minute after deep vacuum, it is 200-400Nl/min that argon flow is controlled during soft blow.This method has the characteristics that cleanliness height, simple process, at low cost.

Description

A kind of smelting process of high strength low carbon bainibic steel
Technical field
The present invention relates to field of iron and steel smelting, in particular to a kind of smelting process of high strength low carbon bainibic steel.
Background technique
As steel industry scientific and technological progress requires the comprehensive mechanical property of steel from light-weighted requirement is met Higher and higher, high strength low carbon bainibic steel is known as environment-friendly steel grade as new steel system developed in recent years, it Usual phosphorus content control 0.20% hereinafter, mainly adding the elements such as Mn, Cr, Ni, Mo carries out alloying, by dislocation strengthening and V-N steel is completed, and the uniform tiny bainite structure of high density dislocation substructure is obtained, compared to identical phosphorus content Ferrite pearlific steel has higher intensity, good toughness and welding performance.The quality of product is not only increased, and The service life for extending product is widely used in engineering machinery, pressure vessel, bridge, railway, oil pipeline and large scale structure The fields such as part.
High strength bainite steel, general alloy amount is bigger, and the general fusing point of the alloying elements such as Cr, Ni, Mo of addition is high, difficult With fusing, so Composition Control get up it is relatively difficult, along with quality of the bainitic steel to Cleanliness of Molten Steel, field trash, steel is wanted Ask comparison stringent.
Summary of the invention
In view of this, the present invention provides a kind of smelting process of high strength low carbon bainibic steel.
The present invention provides a kind of smelting process of high strength low carbon bainibic steel, in turn includes the following steps:
Molten iron pretreatment: using the desulfurization of KR method, obtains low-phosphorous, the low-sulfur molten iron of P≤0.110%, S≤0.005%, temperature T≥1250℃；
Converter smelting: using double slag-remaining slag operations, bottom blowing whole process uses Argon, highcasting speed technique, the control of terminal C content In 0.06-0.10%, P≤0.008%, tapping temperature control is at 1620-1650 DEG C, tapping process, using ferrosilicon, low-carbon ferromanganese Alloying is carried out, deep deoxidation uses al-free deoxidation, and using slide plate pushing off the slag, 3kg/ tons of steel top slag limes are added after tapping；
LF refining: heating slag making guarantees white slag refining time >=20 minute, carries out deep deoxidation using al-free deoxidation, be added Medium carbon ferrochrome carries out microalloying；
VD is refined: deep vacuum time >=15 minute of holding, deep vacuum degree≤80Pa, soft blow time >=30 point after deep vacuum Clock, it is 200-400Nl/min that argon flow is controlled during soft blow.
Further, in the bainitic steel: C content 0.14-0.22%, Si content is 0.80-1.20%, Mn content For 2.20-2.45%, P content is that≤0.022%, S content is≤0.015%, and Al content is that≤0.030%, Cr content is 0.7-1.10%, Ni content are 0.40-0.70%, and Mo content is 0.20-0.50%, and surplus is iron.
The present invention provides a kind of smelting process of high strength low carbon bainibic steel, and the smelting process is double by using converter Slag-stays slag technique, improves converter terminal tapping temperature, and slide plate pushing off the slag effectively controls alloy melting, ingredient, and LF refining uses Slugging is stirred by force and carries out deep deoxidation, effectively guarantees the stable absorption rate of alloying element, to further decrease energy consumption, promote product Stability.The present invention refines production technology by molten iron pretreatment-converter smelting-LF refining-VD and smelts bainitic steel, has clean Cleanliness height, simple process, feature at low cost.The rail for the continuous casting billet milling processed in the process of the present invention, can satisfy heavy duty The technical quality requirement of route high-strength tenacity rail.
Specific embodiment
The invention discloses a kind of smelting process of high strength low carbon bainibic steel, those skilled in the art can use for reference this Literary content, is suitably modified realization of process parameters.In particular, it should be pointed out that all similar substitutions and modifications are to art technology It is it will be apparent that they are considered as being included in the present invention for personnel.Method and application of the invention has passed through preferably Embodiment is described, related personnel obviously can not depart from the content of present invention, in spirit and scope to side as described herein Method and application are modified or appropriate changes and combinations, carry out implementation and application the technology of the present invention.
It is that 0.80-1.20%, Mn contain that method provided by the invention, which is 0.14-0.22%, Si content especially suitable for C content, Amount is 2.20-2.45%, P content is≤0.022%；S content is≤0.015%；Al content is≤0.030%；Cr content is 0.7-1.10%；Ni content is 0.40-0.70%；Mo content is the smelting of the bainitic steel of 0.20-0.50%.It is pre- according to molten iron Processing-converter smelting-LF refining-VD refinery practice, is finally reached low carbon high-strength bainitic steel component requirements, while also meeting Produce the demand of high-strength bainite rail.
Specifically, the present invention provides a kind of smelting process of high strength low carbon bainibic steel, it successively include walking as follows It is rapid:
Molten iron pretreatment: using the desulfurization of KR method, obtains low-phosphorous, the low-sulfur molten iron of P≤0.110%, S≤0.005%, temperature T≥1250℃；
Converter smelting: using double slag-remaining slag operations, bottom blowing whole process uses Argon, highcasting speed technique, the control of terminal C content In 0.06-0.10%, P≤0.008%, tapping temperature control is at 1620-1650 DEG C, tapping process, using ferrosilicon, low-carbon ferromanganese Alloying is carried out, deep deoxidation uses al-free deoxidation, and using slide plate pushing off the slag, 3kg/ tons of steel top slag limes are added after tapping；
LF refining: heating slag making guarantees white slag refining time >=20 minute, carries out deep deoxidation using al-free deoxidation, be added Medium carbon ferrochrome carries out microalloying；
VD is refined: deep vacuum time >=15 minute of holding, deep vacuum degree≤80Pa, soft blow time >=30 point after deep vacuum Clock, it is 200-400Nl/min that argon flow is controlled during soft blow.
The present invention provides a kind of smelting process of high strength low carbon bainibic steel, and the smelting process is double by using converter Slag-stays slag technique, improves converter terminal tapping temperature, and slide plate pushing off the slag effectively controls alloy melting, ingredient, and LF refining uses Slugging is stirred by force and carries out deep deoxidation, effectively guarantees the stable absorption rate of alloying element, to further decrease energy consumption, promote product Stability.The present invention refines production technology by molten iron pretreatment-converter smelting-LF refining-VD and smelts bainitic steel, has clean Cleanliness height, simple process, feature at low cost.The rail for the continuous casting billet milling processed in the process of the present invention, can satisfy heavy duty The technical quality requirement of route high-strength tenacity rail.
Below with reference to embodiment, the present invention is further explained:
Embodiment 1-4
(1) molten iron pre-processes: the desulfurization of KR method is used, low-phosphorous, the low-sulfur molten iron of P≤0.110%, S≤0.005% are obtained, Temperature T >=1250 DEG C.Ingredient and temperature are as shown in table 1 after molten iron KR pretreatment:
Ingredient and temperature after 1 molten iron KR of table pretreatment
(2) converter smelting: using double slag-remaining slag operations, bottom blowing whole process uses Argon, highcasting speed technique, terminal C content control System is in 0.06-0.10%, P≤0.008%, and tapping temperature control is at 1620-1650 DEG C, tapping process, using ferrosilicon, low Carbon Manganese Iron carries out alloying, and deep deoxidation uses al-free deoxidation, and using slide plate pushing off the slag, 3kg/ tons of steel top slag limes are added after tapping.Converter Alloy is added as shown in table 2 after Terminal Process Control and tapping:
2 converter smelting endpoint of table and alloy addition
2 converter smelting endpoint of continued and alloy addition
(3) LF refining mainly heats up slag making, guarantees white slag refining time >=20 minute, is carried out using al-free deoxidation deep de- Oxygen is added medium carbon ferrochrome and carries out microalloying, rationally finely tuned to other ingredients.LF refining heats melted alloy and makes white slag Parameter is as shown in table 3:
3 LF refining technological parameter of table
(4) VD, which is refined, keeps deep vacuum time >=15 minute, deep vacuum degree≤80Pa, soft blow time >=30 point after deep vacuum Clock, it is 200-400Nl/min that argon flow is controlled during soft blow.It is as shown in table 4 that VD refines specific process parameter.
4 VD refinery practice parameter of table
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered It is considered as protection scope of the present invention.

Claims (2)

1. a kind of smelting process of high strength low carbon bainibic steel, which is characterized in that in turn include the following steps:
Molten iron pretreatment: use the desulfurization of KR method, obtain P≤0.110%, S≤0.005% low-phosphorous, low-sulfur molten iron, temperature T >= 1250℃；
Converter smelting: using double slag-remaining slag operations, bottom blowing whole process uses Argon, highcasting speed technique, and the control of terminal C content exists 0.06-0.10%, P≤0.008%, tapping temperature control is at 1620-1650 DEG C, tapping process, using ferrosilicon, low-carbon ferromanganese into Row alloying, deep deoxidation use al-free deoxidation, and using slide plate pushing off the slag, 3kg/ tons of steel top slag limes are added after tapping；
LF refining: heating slag making guarantees white slag refining time >=20 minute, carries out deep deoxidation, carbon in addition using al-free deoxidation Ferrochrome carries out microalloying；
VD is refined: deep vacuum time >=15 minute of holding, deep vacuum degree≤80Pa, soft blow time >=30 minute after deep vacuum, soft Control argon flow is 200-400NL/min during blowing.
2. the smelting process of high strength low carbon bainibic steel according to claim 1, which is characterized in that the bainitic steel In: C content 0.14-0.22%, Si content be 0.80-1.20%, Mn content be 2.20-2.45%, P content be≤ 0.022%, S content are≤0.015%, and Al content is that≤0.030%, Cr content is 0.7-1.10%, and Ni content is 0.40- 0.70%, Mo content are 0.20-0.50%, and surplus is iron.
CN201710514782.4A 2017-06-29 2017-06-29 A kind of smelting process of high strength low carbon bainibic steel Withdrawn - After Issue CN107385142B (en)

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CN109023060B (en) * 2018-08-28 2020-11-20 包头钢铁（集团）有限责任公司 Steel rail and production method of steel rail
CN109295275B (en) * 2018-10-28 2021-03-09 石钢京诚装备技术有限公司 18Cr2Ni4W high-alloy carburizing steel and production method thereof
CN109468428B (en) * 2018-12-17 2020-10-27 包头钢铁（集团）有限责任公司 Method for controlling phosphorus content in high-strength and high-toughness heavy rail steel by converter
CN110885950A (en) * 2019-10-30 2020-03-17 鞍钢股份有限公司 High-strength and high-toughness steel rail for crane and manufacturing method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101104906A (en) * 2007-07-19 2008-01-16 东华大学 Low-carbon bainite steel and preparation method thereof
CN101787489A (en) * 2010-03-11 2010-07-28 燕山大学 Easy-welding low-carbon bainitic steel and manufacturing method thereof
CN104911503A (en) * 2015-06-12 2015-09-16 江阴兴澄特种钢铁有限公司 Extra-thick tempering EH40 steel for ocean engineering and preparation method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101104906A (en) * 2007-07-19 2008-01-16 东华大学 Low-carbon bainite steel and preparation method thereof
CN101787489A (en) * 2010-03-11 2010-07-28 燕山大学 Easy-welding low-carbon bainitic steel and manufacturing method thereof
CN104911503A (en) * 2015-06-12 2015-09-16 江阴兴澄特种钢铁有限公司 Extra-thick tempering EH40 steel for ocean engineering and preparation method thereof

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