CN107502816A - The method that hot rolling Properties of Heavy Rail Steel practical decarburized depth can be reduced - Google Patents

The method that hot rolling Properties of Heavy Rail Steel practical decarburized depth can be reduced Download PDF

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Publication number
CN107502816A
CN107502816A CN201710614187.8A CN201710614187A CN107502816A CN 107502816 A CN107502816 A CN 107502816A CN 201710614187 A CN201710614187 A CN 201710614187A CN 107502816 A CN107502816 A CN 107502816A
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CN
China
Prior art keywords
heavy rail
strand
properties
rolled
hot rolling
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
CN201710614187.8A
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Chinese (zh)
Inventor
许斌
崔恺
王建锋
李钧正
杨正宗
汪鹏
张海旺
郭朝军
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HBIS Co Ltd Handan Branch
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HBIS Co Ltd Handan Branch
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 HBIS Co Ltd Handan Branch filed Critical HBIS Co Ltd Handan Branch
Priority to CN201710614187.8A priority Critical patent/CN107502816A/en
Publication of CN107502816A publication Critical patent/CN107502816A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74Temperature control, e.g. by cooling or heating the rolls or the product
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24Ferrous alloys, e.g. steel alloys containing chromium with vanadium

Abstract

The invention discloses a kind of method that can reduce hot rolling Properties of Heavy Rail Steel practical decarburized depth, the heavy rail strand is heated, rolling, and Properties of Heavy Rail Steel is made;Cr weight percentages are 0.1%~0.14% in the heavy rail strand;In the heating process, bringing-up section temperature control is at 1230 DEG C and following during insulation to be rolled, and soaking zone temperature control is at 1250 DEG C and following.Decarburized layer qualification rate can be brought up to more than 96% by the present invention by optimizing strand alloying component and optimization keeping temperature rule to be rolled, with the advantages of technique is simple, strong operability, significant effect, it is possible to prevente effectively from heavy rail strand causes the exceeded problem of decarburized layer because of overlong time to be rolled.This method improves production efficiency, and Rolling Yield is significantly increased, and improves heavy rail properties percent of pass, and then realizes the reduction of cost.

Description

The method that hot rolling Properties of Heavy Rail Steel practical decarburized depth can be reduced
Technical field
The present invention relates to a kind of steel rolling method, especially a kind of method that can reduce hot rolling Properties of Heavy Rail Steel practical decarburized depth.
Background technology
With the fast development of high-speed railway, requirement more and more higher of the domestic outer rail market to seamed high-speed steel rail.Due to height The phosphorus content of fast rail is higher, and oxidation and decarbonization phenomenon easily occurs when heating stove heat, produces thicker decarburized layer, causes into Material rate is relatively low.Rail decarburization can cause rail to occur, and mechanical performance declines, hardness reduces, it is low with fatigue strength reduction etc. to wear no resistance Defect.Seamed high-speed steel rail practical decarburized depth is classified as one of important indicator, it is specified that practical decarburized depth cannot be greater than 0.5mm by the country.Mesh The fragmentary accident of preceding large-scale factory's production is more, thus long influence practical decarburized depth of caused heat time and decarburization qualification rate, Therefore it is of crucial importance to improve decarburization qualification rate to reduce practical decarburized depth.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of method that can reduce hot rolling Properties of Heavy Rail Steel practical decarburized depth, to carry High heavy rail properties percent of pass.
In order to solve the above technical problems, the technical solution used in the present invention is:The heavy rail strand is heated, rolling, Properties of Heavy Rail Steel is made;Cr weight percentages are 0.1%~0.14% in the heavy rail strand;In the heating process, insulation to be rolled When bringing-up section temperature control it is at 1230 DEG C and following, soaking zone temperature control is at 1250 DEG C and following.
When insulation to be rolled of the present invention refers to that heating furnace stops tapping 30min and the above.
The weight percentage of heavy rail strand composition of the present invention is:C 0.72%~0.78%, Si 0.50%~ 0.70%th, Mn 0.75%~0.95%, P≤0.025%, S≤0.015%, Al≤0.0040%, V 0.04%~0.07%, Cr 0.1% ~0.14%, surplus is Fe and inevitable impurity.
It is using beneficial effect caused by above-mentioned technical proposal:The present invention is by optimizing strand alloying component and excellent More than 96% can be brought up to by decarburized layer qualification rate by changing keeping temperature rule to be rolled, have technique simple, strong operability, significant effect Advantage, it is possible to prevente effectively from heavy rail strand causes the exceeded problem of decarburized layer because of overlong time to be rolled.This method improves production Efficiency, Rolling Yield is significantly increased, improves heavy rail properties percent of pass, and then realize the reduction of cost, be not only Enterprise brings huge economic benefit, while can also create huge social benefit.
Embodiment
With reference to embodiment, the present invention is further detailed explanation.
The method that instinct reduces hot rolling Properties of Heavy Rail Steel practical decarburized depth includes optimization strand composition and keeping temperature rule to be rolled, technique As described below:(1)The composition Cr contents of Properties of Heavy Rail Steel strand are brought up to 0.1%~0.14%.Improving alloying elements cr content can drop Low practical decarburized depth, the practical decarburized depth of high chrome is significantly lower than other steel grades in actual production process, because chromium can be with Billet surface is formed comparatively dense oxide layer, prevent the decarburization of steel billet.The weight percentage of the heavy rail composition of steel is: C 0.72%~0.78%, Si 0.50%~0.70%, Mn 0.75%~0.95%, P≤0.025%, S≤0.015%, Al≤ 0.0040%th, V 0.04%~0.07%, Cr 0.1%~0.14%, surplus are Fe and inevitable impurity.
(2)Production process needs insulation to be rolled when having rolling accident, insulation to be rolled refers to due to adding caused by steel rolling accident Hot stove stops after tapping when waiting the time of tapping to be 30min and the above, take soaking zone temperature control at 1250 DEG C and with Under, bringing-up section temperature control is in 1230 DEG C and following heating measures.Heating technique is during normal production:Bringing-up section temperature 1100 ~1280 DEG C, 1220~1270 DEG C of soaking zone temperature, be 2.5~4.5h in stove total time.During such as normal production without rolling accident, Routinely heating technique is operated.
Embodiment 1-8:The method that instinct reduces hot rolling Properties of Heavy Rail Steel practical decarburized depth uses following concrete technologies.
(1)The Properties of Heavy Rail Steel model U75V-T, the component content of each embodiment are shown in Table 1.
Table 1:The component content of each embodiment(wt%)
In table 1, surplus is Fe and inevitable impurity.
(2)The technological parameter of each embodiment and the practical decarburized depth of products obtained therefrom are shown in Table 2.
Table 2:The technological parameter and practical decarburized depth of each embodiment

Claims (3)

  1. A kind of 1. method that can reduce hot rolling Properties of Heavy Rail Steel practical decarburized depth, it is characterised in that:The heavy rail strand is heated, rolls System, is made Properties of Heavy Rail Steel;Cr weight percentages are 0.1%~0.14% in the heavy rail strand;In the heating process, guarantor to be rolled Bringing-up section temperature control is at 1230 DEG C and following when warm, and soaking zone temperature control is at 1250 DEG C and following.
  2. 2. the method according to claim 1 that hot rolling Properties of Heavy Rail Steel practical decarburized depth can be reduced, it is characterised in that:It is described to be rolled When insulation refers to that heating furnace stops tapping 30min and the above.
  3. 3. the method according to claim 1 or 2 that hot rolling Properties of Heavy Rail Steel practical decarburized depth can be reduced, it is characterised in that described The weight percentage of heavy rail strand composition is:C 0.72%~0.78%, Si 0.50%~0.70%, Mn 0.75%~0.95%, P ≤ 0.025%, S≤0.015%, Al≤0.0040%, V 0.04%~0.07%, Cr 0.1%~0.14%, surplus are Fe and can not kept away The impurity exempted from.
CN201710614187.8A 2017-07-25 2017-07-25 The method that hot rolling Properties of Heavy Rail Steel practical decarburized depth can be reduced Pending CN107502816A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710614187.8A CN107502816A (en) 2017-07-25 2017-07-25 The method that hot rolling Properties of Heavy Rail Steel practical decarburized depth can be reduced

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710614187.8A CN107502816A (en) 2017-07-25 2017-07-25 The method that hot rolling Properties of Heavy Rail Steel practical decarburized depth can be reduced

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CN107502816A true CN107502816A (en) 2017-12-22

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109023044A (en) * 2018-08-01 2018-12-18 邯郸钢铁集团有限责任公司 The method for controlling Properties of Heavy Rail Steel decarburized layer deepness
CN113392375A (en) * 2021-06-11 2021-09-14 攀钢集团攀枝花钢钒有限公司 Improved process for reducing thickness of decarburized layer of heavy rail steel

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101144116A (en) * 2007-11-13 2008-03-19 攀钢集团攀枝花钢铁研究院 Casting blank heating method for controlling surface to generate ferric oxide structure

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101144116A (en) * 2007-11-13 2008-03-19 攀钢集团攀枝花钢铁研究院 Casting blank heating method for controlling surface to generate ferric oxide structure

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
胡盛德等: "U75V高速轨钢脱碳的影响因素分析", 《武汉科技大学学报》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109023044A (en) * 2018-08-01 2018-12-18 邯郸钢铁集团有限责任公司 The method for controlling Properties of Heavy Rail Steel decarburized layer deepness
CN113392375A (en) * 2021-06-11 2021-09-14 攀钢集团攀枝花钢钒有限公司 Improved process for reducing thickness of decarburized layer of heavy rail steel

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Application publication date: 20171222