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 PDFInfo
- 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
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- 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.)
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Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
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
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)
- 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. 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. 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.
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 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107502816A true CN107502816A (en) | 2017-12-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710614187.8A Pending CN107502816A (en) | 2017-07-25 | 2017-07-25 | The method that hot rolling Properties of Heavy Rail Steel practical decarburized depth can be reduced |
Country Status (1)
| Country | Link |
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| CN (1) | CN107502816A (en) |
Cited By (2)
| 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)
| 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 |
-
2017
- 2017-07-25 CN CN201710614187.8A patent/CN107502816A/en active Pending
Patent Citations (1)
| 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)
| 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)
| 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 |
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