CN109022661A - A method of it reducing Properties of Heavy Rail Steel and hurts rail rate - Google Patents

A method of it reducing Properties of Heavy Rail Steel and hurts rail rate Download PDF

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Publication number
CN109022661A
CN109022661A CN201710439364.3A CN201710439364A CN109022661A CN 109022661 A CN109022661 A CN 109022661A CN 201710439364 A CN201710439364 A CN 201710439364A CN 109022661 A CN109022661 A CN 109022661A
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China
Prior art keywords
slag
steel
minute
heavy rail
rail
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CN201710439364.3A
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Chinese (zh)
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CN109022661B (en
Inventor
徐向阳
李田
徐博
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00Refining of pig-iron; Cast iron
    • C21C1/02Dephosphorising or desulfurising
    • 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
    • B22D11/10Supplying or treating molten metal
    • B22D11/11Treating the molten metal
    • B22D11/114Treating the molten metal by using agitating or vibrating means
    • B22D11/115Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • 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
    • B22D11/18Controlling or regulating processes or operations for pouring
    • B22D11/188Controlling or regulating processes or operations for pouring responsive to thickness of solidified shell
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28Manufacture of steel in the converter
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/06Deoxidising, e.g. killing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/064Dephosphorising; Desulfurising
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/068Decarburising
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10Handling in a vacuum

Abstract

The present invention relates to a kind of reduction Properties of Heavy Rail Steel to hurt the method for rail rate, produces the mass percent of the desulfurizing iron of Properties of Heavy Rail Steel to 0.0010% or less;Mass percent >=0.25% of converter tapping carbon;It refines LF furnace and controls molten steel and top slag basicity=1.8~2.5, Al in slag2O3Content control controls 30% or less in 4~10%, LF furnace desulfurization degree;Using the non-aluminium deoxidation of a upper round trip, the ladle that steel grade of titaniferous does not use;If 5) VD is handled, it is vacuum-treated later period soft argon blowing time >=10 minute;If RH processing deep vacuum net circulation time >=15 minute, to calm time >=20 minute of casting after vacuum processing;Middle packet baking temperature reaches 1400 DEG C or more and retention time >=20 minute;Blowing argon gas, crystallizer do not take no argon gas to operate to continuous casting intermediate inlet;The total thickness of slag layer target control of covering slag is to 40 ± 5mm in crystallizer;The Metal in Tundish degree of superheat >=25 DEG C.The present invention controls inclusion in heavy rail object content, and raising steel is pure, the yield of waste product is greatly lowered, product quality is significantly promoted.

Description

A method of it reducing Properties of Heavy Rail Steel and hurts rail rate
Technical field
The present invention relates to field of smelting, in particular to a kind of method for reducing Properties of Heavy Rail Steel and hurting rail rate.
Background technique
Production Properties of Heavy Rail Steel generally uses molten iron pretreatment-pneumatic steelmaking-LF furnace-RH or VD- bloom continuous casting technique It being produced, overall craft route is popular, but totally relatively high and stable property is bad for the rail rate of hurting of Properties of Heavy Rail Steel, how to innovate, Control technical parameter details improves steel billet degree of purity and annoyings production practices always to be obviously improved Properties of Heavy Rail Steel flaw detection qualification rate.Shadow Ringing the factor of Properties of Heavy Rail Steel flaw detection qualification rate, mainly steel inclusion does not exclude in addition to hydrogen induced cracking other than and size is larger leads Cause that heavy rail fault detection is unqualified scraps.Hydrogen induced cracking can be solved by vacuum dehydrogenation, and improving Properties of Heavy Rail Steel flaw detection qualification rate emphasis is It reduces to generate and effectively remove and is mingled with product and avoids as foreign impurity in casting to the pollution of molten steel.Based on these factors It needs to design a set of new manipulation method and hurts rail rate to reduce and stablize Properties of Heavy Rail Steel.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of methods that reduction Properties of Heavy Rail Steel hurts rail rate, are located in advance using molten iron Reason-pneumatic steelmaking-LF furnace-RH (or VD)-bloom continuous casting technique carries out production Properties of Heavy Rail Steel, and it is overall higher that rail rate is hurt in solution And stability is bad, leads to underproof problem of detecting a flaw.
To achieve the above object, the present invention is implemented with the following technical solutions:
A method of it reducing Properties of Heavy Rail Steel and hurts rail rate, comprising the following specific steps
1) mass percent of the desulfurizing iron of Properties of Heavy Rail Steel is produced to 0.0010% hereinafter, removing top slag after desulfurizing iron;
2) mass percent >=0.25% of converter tapping carbon, avoids low-carbon from tapping;
3) refining LF furnace controls molten steel and top slag basicity=1.8~2.5, Al in slag2O3Content control is de- in 4~10%, LF furnace 30% or less sulphur rate control;
4) using the non-aluminium deoxidation of a upper round trip, the ladle that steel grade of titaniferous does not use;
If 5) VD is handled, it is vacuum-treated later period soft argon blowing time >=10 minute;If the RH processing deep vacuum net circulation time >= 15 minutes, to calm time >=20 minute of casting after vacuum processing;
6) packet baking temperature reaches 1400 DEG C or more and retention time >=20 minute in;
7) blowing argon gas, crystallizer do not take no argon gas to operate to continuous casting intermediate inlet, eliminate argon gas fluctuation to the shadow of slag It rings;
8) single M-EMS Current >=350A;
9) continuous cast mold liquid level takes automatic control, fluctuation≤± 3mm;Mold liquid level takes single slag line to operate;
10) in crystallizer the total thickness of slag layer target control of covering slag to 40 ± 5mm;
11) the Metal in Tundish degree of superheat >=25 DEG C avoid cast cold.
Compared with prior art, the beneficial effects of the present invention are:
The present invention controls inclusion in heavy rail object content, and raising steel is pure, and Properties of Heavy Rail Steel hurts rail rate to be reduced from 0.6~0.8% To 0.3% hereinafter, and keep it is more stable, hurt rail rate and be substantially reduced, considerably reduce flaw detection below proof yield, produce Quality, which has, significantly to be promoted.
Specific embodiment
Below with reference to embodiment, the present invention is further described:
The present invention will be described in detail for following embodiment.These embodiments be only to preferred embodiment of the invention into Row description, does not limit the scope of the present invention.
Embodiment 1 produces the method for controlling operation thereof of Properties of Heavy Rail Steel U71Mn,
1) mass percent of the desulfurizing iron of Properties of Heavy Rail Steel is produced to 0.005% hereinafter, removing top slag after desulfurizing iron.
2) mass percent of converter tapping carbon is 0.30%~0.63%.
3) refining LF furnace control molten steel and top slag basicity is 2.0~2.2, Al in slag2O3Mass percentage content control 5~ 20% or less 8%, LF furnace desulfurization degree control.
4 using the non-aluminium deoxidation of a upper round trip, the ladle that steel grade of titaniferous does not use.
If 5) VD is handled, it is vacuum-treated the latter stage soft argon blowing time 10~12 minutes;If RH is handled, the deep vacuum net circulation time 20 minutes.To casting calm 25~30 minutes time after vacuum processing.
6) packet baking temperature reaches 1450 DEG C or more and the retention time 30 minutes in.
7) blowing argon gas, crystallizer do not take no argon gas to operate to continuous casting intermediate inlet.
8) single M-EMS Current 500A.
9) continuous cast mold liquid level takes automatic control, fluctuation≤± 3mm;Mold liquid level takes single slag line to operate.
10) in crystallizer the total thickness of slag layer target control of covering slag to 35~40mm,
11) Metal in Tundish target superheat degree is 28 DEG C.
Embodiment 2
Embodiment 1 produces the method for controlling operation thereof of Properties of Heavy Rail Steel U75VG,
1) mass percent of the desulfurizing iron of Properties of Heavy Rail Steel is produced to 0.003% hereinafter, removing top slag after desulfurizing iron.
2) mass percent of converter tapping carbon is 0.25%~0.66%.
3) refining LF furnace control molten steel and top slag basicity is 1.9~2.0, Al in slag2O3Mass percentage content control 7~ 15% or less 9%, LF furnace desulfurization degree control.
4 using the non-aluminium deoxidation of a upper round trip, the ladle that steel grade of titaniferous does not use.
If 5) VD is handled, it is vacuum-treated the later period soft argon blowing time 13~18 minutes;If RH is handled, the deep vacuum net circulation time 20 minutes.To casting calm 30~35 minutes time after vacuum processing.
6) packet baking temperature reaches 1450 DEG C or more and the retention time 25 minutes in.
7) blowing argon gas, crystallizer do not take no argon gas to operate to continuous casting intermediate inlet.
8) single M-EMS Current 450A.
9) continuous cast mold liquid level takes automatic control, fluctuation≤± 3mm;Mold liquid level takes single slag line to operate.
10) in crystallizer the total thickness of slag layer target control of covering slag to 37~42mm,
11) Metal in Tundish target superheat degree is 30 DEG C.

Claims (1)

1. a kind of method for reducing Properties of Heavy Rail Steel and hurting rail rate, which is characterized in that comprising the following specific steps
1) mass percent of the desulfurizing iron of Properties of Heavy Rail Steel is produced to 0.0010% hereinafter, removing top slag after desulfurizing iron;
2) mass percent >=0.25% of converter tapping carbon, avoids low-carbon from tapping;
3) refining LF furnace controls molten steel and top slag basicity=1.8~2.5, Al in slag2O3Mass percentage content control 4~10%, 30% or less LF furnace desulfurization degree control;
4) using the non-aluminium deoxidation of a upper round trip, the ladle that steel grade of titaniferous does not use;
If 5) VD is handled, it is vacuum-treated later period soft argon blowing time >=10 minute;If RH processing deep vacuum net circulation time >=15 point Clock, to calm time >=20 minute of casting after vacuum processing;
6) packet baking temperature reaches 1400 DEG C or more and retention time >=20 minute in;
7) blowing argon gas, crystallizer do not take no argon gas to operate to continuous casting intermediate inlet, eliminate influence of the argon gas fluctuation to slag;
8) single M-EMS Current >=350A;
9) continuous cast mold liquid level takes automatic control, fluctuation≤± 3mm;Mold liquid level takes single slag line to operate;
10) in crystallizer the total thickness of slag layer target control of covering slag to 40 ± 5mm;
11) the Metal in Tundish degree of superheat >=25 DEG C avoid cast cold.
CN201710439364.3A 2017-06-12 2017-06-12 Method for reducing heavy rail steel rail damage rate Active CN109022661B (en)

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Application Number Priority Date Filing Date Title
CN201710439364.3A CN109022661B (en) 2017-06-12 2017-06-12 Method for reducing heavy rail steel rail damage rate

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CN109022661A true CN109022661A (en) 2018-12-18
CN109022661B CN109022661B (en) 2020-06-23

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110923405A (en) * 2019-10-31 2020-03-27 邯郸钢铁集团有限责任公司 Process control method for reducing hydrogen hazard in steel rail

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101289731A (en) * 2008-05-09 2008-10-22 莱芜钢铁股份有限公司 CrMnTi narrow hardenability strip pinion steels and method of manufacture
CN104946844A (en) * 2015-07-20 2015-09-30 攀钢集团攀枝花钢铁研究院有限公司 Rail steel refining method
CN104946852A (en) * 2015-06-30 2015-09-30 攀钢集团攀枝花钢铁研究院有限公司 Efficient desulfuration method for heavy rail steel
CN104975130A (en) * 2015-07-20 2015-10-14 攀钢集团攀枝花钢铁研究院有限公司 Method for controlling purity of heavy rail steel
CN105063267A (en) * 2015-08-24 2015-11-18 武汉钢铁(集团)公司 Production method for high-strength alloy R320Cr steel rails
US20160010188A1 (en) * 2014-07-14 2016-01-14 Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd. Heat treatment method for increasing the depth of hardening layer in a steel rail and steel rail obtained with the method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101289731A (en) * 2008-05-09 2008-10-22 莱芜钢铁股份有限公司 CrMnTi narrow hardenability strip pinion steels and method of manufacture
US20160010188A1 (en) * 2014-07-14 2016-01-14 Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd. Heat treatment method for increasing the depth of hardening layer in a steel rail and steel rail obtained with the method
CN104946852A (en) * 2015-06-30 2015-09-30 攀钢集团攀枝花钢铁研究院有限公司 Efficient desulfuration method for heavy rail steel
CN104946844A (en) * 2015-07-20 2015-09-30 攀钢集团攀枝花钢铁研究院有限公司 Rail steel refining method
CN104975130A (en) * 2015-07-20 2015-10-14 攀钢集团攀枝花钢铁研究院有限公司 Method for controlling purity of heavy rail steel
CN105063267A (en) * 2015-08-24 2015-11-18 武汉钢铁(集团)公司 Production method for high-strength alloy R320Cr steel rails

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110923405A (en) * 2019-10-31 2020-03-27 邯郸钢铁集团有限责任公司 Process control method for reducing hydrogen hazard in steel rail

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