CN108504838A - A kind of production method of European standard R350LHT burning optimization on line rail - Google Patents
A kind of production method of European standard R350LHT burning optimization on line rail Download PDFInfo
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- CN108504838A CN108504838A CN201810231643.5A CN201810231643A CN108504838A CN 108504838 A CN108504838 A CN 108504838A CN 201810231643 A CN201810231643 A CN 201810231643A CN 108504838 A CN108504838 A CN 108504838A
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- rail
- line
- burning optimization
- temperature
- r350lht
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/04—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of production methods of European standard R350LHT burning optimization on line rail, after roll out steel rail is air-cooled to 780~750 DEG C, On-line accelerated cooling and temperature are maintained to 590~610 DEG C of progress burning optimization on line, and Temperature fall obtains R350LHT burning optimization on line rail；Wherein, the time of burning optimization on line is 100~120s.The production method of the burning optimization on line rail of the present invention, improves Rail Production efficiency, reduces energy consumption production cost；Obtained R350LHT burning optimization on line steel rail straightness is good, and residual stress is small, and quality is high, reduces the welding point on rail, extends service life, increases rail transport safety, is conducive to the needs for meeting railway speed increase development.
Description
Technical field
The present invention relates to metallurgical material technical field more particularly to a kind of European standard R350LHT burning optimization on line rail
Production method.
Background technology
With the continuous rapid development of society, using more and more, the construction of track increasingly accelerates rail transport, also,
Now with Heavy-Haul Railway, the development of speed-raising, the burden of rail increasingly aggravates, especially on sharp radius curve, the mill of rail
Consumption is very serious, and thereby using short life, repair and maintenance period are short.Therefore, the quality of rail is put forward higher requirements.Separately
Outside, there are low output, many defects such as Energy Consumption Cost is high, rail quality is bad for the production technology of current rail.Therefore,
To optimization rail, improve rail quality and optimize rail manufacturing technique method there is an urgent need.
Therefore, those skilled in the art is dedicated to developing a kind of life of European standard R350LHT burning optimization on line rail
Production method.
Invention content
In view of the drawbacks described above of the prior art, the technical problem to be solved by the present invention is to steel rail layings in the prior art to make
With short life, repair and maintenance period are short, and the quality of rail is bad, and Rail Production method low output, Energy Consumption Cost are high.
To achieve the above object, the present invention provides a kind of producers of European standard R350LHT burning optimization on line rail
Method, including after roll out steel rail is air-cooled to 780~750 DEG C, On-line accelerated cooling and temperature maintains to 590~610 DEG C exist
Line is heat-treated, and Temperature fall obtains R350LHT burning optimization on line rail；
Further, the time of the burning optimization on line is 100~120s；
Further, the obtained burning optimization on line rail includes the component of following weight percent：C 0.76~
0.79%；Si 0.50~0.58%；Mn 1.10~1.20%；V≤0.03%；P≤0.020%；S≤0.025%； Cr≤
0.30%；
Further, tensile strength Rm >=1175MPa of the obtained burning optimization on line rail, elongation after fracture A >=
9%, tread 350~390HB of hardness, the cross-section 1 point 340HB of surface hardness of rail head；2 points >=331HB；3 points >=321HB；4 points >=
340HB, remaining mechanical property meet the requirement of EN13674.1-2011 standards.
Further, the production method of the burning optimization on line rail, the specific steps of the roll out steel rail include：
Step 1, molten iron pretreatment；
Step 2, converter smelting；
Step 3, the refining of LF stoves；
Step 4, VD vacuum outgas；
Step 5, continuous casting；
Step 6, heating steel billet；
Step 7, roll out steel rail.
Further, in the step 1, the sulfur content of the pretreated molten iron of molten iron is≤0.02%；
Further, in the step 2, when converter smelting, control tapping C content is >=0.08%, tapping temperature is >=
1630℃；
Further, in the step 3, LF stoves refine when, control basicity of slag be >=2.0, temperature of offing normal be 1585~
1595℃；
Further, in the step 3, the molten steel that LF stoves refine includes following weight percent composition：C 0.76
~0.79%；Si 0.50~0.58%；Mn 1.10~1.20%；V≤0.03%；P≤0.020%；S≤0.025%； Cr
≤ 0.30%；
Further, in the step 4, when VD vacuum outgas, the deep vacuum outgas time is >=15min, after vacuum outgas
The soft blow time is >=18min；
Further, in the step 5, casting process uses protective casting, and using low aluminium covering slag, secondary cooling zone is using super
Weak cold water distribution, whole perseverance pulling rate operation；
Further, in the step 6, when heating steel billet, heating strand total time is >=2.5 hours；Preheating section temperature
It it is≤800 DEG C, it is≤1200 DEG C to heat one section of temperature, and it is 1100~1300 DEG C to heat two sections of temperature, and soaking zone temperature is 1100
~1260 DEG C；
Further, in the step 7, when roll out steel rail, start rolling temperature control is 1080~1150 DEG C, and finishing temperature is
930~950 DEG C.
In the better embodiment of the present invention, in the production method of the burning optimization on line rail, when burning optimization on line
Between be 110s；
In another better embodiment of the present invention, in the production method of the burning optimization on line rail, at online heat
The reason time is 100s；
In another better embodiment of the present invention, in the production method of the burning optimization on line rail, at online heat
The reason time is 120s；
In the better embodiment of the present invention, the production method of the burning optimization on line rail, the rail is air-cooled to
760 DEG C, simultaneously temperature is maintained to 580 DEG C of progress burning optimization on line On-line accelerated cooling
In the better embodiment of the present invention, the production method of the burning optimization on line rail, in the step 1, iron
The sulfur content of molten iron after water pretreatment is 0.011%；
In another better embodiment of the present invention, the production method of the burning optimization on line rail, the step 1
In, the sulfur content of the pretreated molten iron of molten iron is 0.02%；
In the better embodiment of the present invention, the production method of the burning optimization on line rail in the step 2, turns
When stove is smelted, control tapping C content is 0.12%, and tapping temperature is 1636 DEG C；
In the better embodiment of the present invention, the production method of the burning optimization on line rail, in the step 3, LF
When stove refines, control basicity of slag is >=2.1, and temperature of offing normal is 1590 DEG C；
In the better embodiment of the present invention, the production method of the burning optimization on line rail, in the step 4, VD
When vacuum outgas, the deep vacuum outgas time is 15min, and the soft blow time is 18min after vacuum outgas；；
In the better embodiment of the present invention, in the step 5, the permanent pulling rate of casting process is 0.50m/min；
In the better embodiment of the present invention, the production method of the burning optimization on line rail, in the step 6, steel
Base heat when, heating strand total time be 2 hours 40 points；Preheating section temperature is 740 DEG C, and the preheating section time is 25 minutes；Heating
One section of temperature is 950 DEG C, and heating a period of time is 50 minutes；Two sections of 1220 DEG C of temperature are heated, it is 55 minutes to heat two times；
Soaking zone temperature is 1250 DEG C, and the soaking zone time is 30 minutes；
In the better embodiment of the present invention, the production method of the burning optimization on line rail, in the step 7, casting
Base is through Rolling With Universal Mill at rail, and start rolling temperature control is 1120 DEG C, and finishing temperature is 945 DEG C.
Using above scheme, the production method of burning optimization on line rail disclosed by the invention has the following technical effects：
(1) the burning optimization on line rail of the method for the present invention production improves the quality of rail compared with existing rail,
Service life is extended, safety is increased, is conducive to the needs for meeting railway speed increase development；
(2) production method of burning optimization on line rail of the invention, yield when rail burning optimization on line is than heat-treated offline
It is 3~4 times high, Rail Production efficiency is substantially increased, energy consumption production cost is reduced；
(3) burning optimization on line Rail Production method using the present invention, entire rail tissue are all under austenite cooling
Come, therefore be not in the coarse-grain softened zone of rail head/web of the rail engaging portion, and the web of the rail, the flange of rail are also suitably strengthened；Immediate quenching
When, while rail head accelerates cooling, to the flange of rail also blowing pressurized air or water cooling, contraction, expansion and transformation stress is made to exist
It is equalized in quenching process, and deformation of rail is limited in hot state using transfer guide roller, quench so rail leaves
Glacing flatness is preferable when fiery equipment, and deflection is smaller when aligning, residual stress is small, and rail quality is high；
In conclusion the production method of the burning optimization on line rail of the present invention, improves Rail Production efficiency, reduces energy
Source consumes production cost；Obtained burning optimization on line steel rail straightness is good, and residual stress is small, and quality is high, reduces on rail
Welding point extends service life, increases rail transport safety, is conducive to the needs for meeting railway speed increase development.
The technique effect of the design of the present invention, concrete structure and generation will be described further below, with fully
Solve the purpose of the present invention, feature and effect.
Specific implementation mode
The preferred embodiment of the present invention introduced below keeps its technology contents more clear and is easy to understand.The present invention can be with
It is emerged from by many various forms of embodiments, protection scope of the present invention is not limited only to the implementation mentioned in text
Example.
Embodiment, burning optimization on line Rail Production method, include the following steps：
1) molten iron pre-processes：Sulfur content 0.011% in molten iron；
2) converter smelting：Control tapping C content 0.12%, 1636 DEG C of tapping temperature, after tapping be added lime, Si-Ca-Ba and
Fluorite modifies clinker, ensures Argon effect in tapping process, slag is pushed up when liquid steel refining is in place, knot has been avoided to stick together phenomenon；
3) LF stoves refine：Basicity of slag >=2.1,1590 DEG C of temperature of offing normal are controlled when LF refining；
4) VD vacuum outgas：Deep vacuum outgas time 15min, soft blow 18min after vacuum outgas, soft blow process argon flow amount
Stablize, molten steel wriggling has no exposed；
5) continuous casting：Casting process uses protective casting, and using low aluminium covering slag, secondary cooling zone uses weak cold water distribution, whole permanent
Pulling rate operates, pulling rate 0.50m/min, opens casting machine electromagnetic agitation and slighter compress, ensures slab quality；
6) heating steel billet：40 points of 2 hours total times are heated, each section of heating time and heating temperature are shown in Table 1；
Table 1R350LHT rail heating parameters
| Preheating section | 1 section of heating | 2 sections of heating | Soaking zone | |
| Heating time | 25min | 50min | 55min | 30min |
| Temperature | 740℃ | 950℃ | 1220℃ | 1250℃ |
7) it rolls：Strand is through Rolling With Universal Mill at rail, start rolling temperature：1100 DEG C, 935 DEG C of finishing temperature；
8) burning optimization on line：Rail is air-cooled to 760 DEG C and enters heat-treatment lines, makes rail in Re Chu using water spray cooling mode
Lineation is quickly cooled to 580 DEG C, and then reducing water mist intensity makes to return the mutually equilibrium of mild intensity of cooling, rail temperature dimension inside rail
It holds and goes out heat-treatment lines, burning optimization on line total time 100s in 580 DEG C of certain times, rail goes out after heat-treatment lines natural air cooling to room
Temperature obtains R350LHT burning optimization on line rail.
Through examining, obtained R350LHT burning optimization on line rail chemical composition percentages are as follows：C：0.79%；Si：
0.58%；Mn：1.17%；P：0.006%；S：0.016%；Cr：0.28；V：0.003；Remaining for Fe and inevitably it is miscellaneous
Matter；
Through examining, obtained R350LHT burning optimization on line mechanics property of rail is as follows：Tensile strength 1236MPa, has no progeny and stretches
Long rate 13%, tread hardness 352HB, rail head cross-section surface hardness 1 point 347HB, 354HB, 352HB；2 point 338HB, 346HB；3 points
326HB；4 point 345HB, 353HB.Rail head of rail metallographic structure is pearlite.
Other technologies scheme of the present invention also has similar using effect.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that the ordinary skill of this field is without wound
The property made labour, which according to the present invention can conceive, makes many modifications and variations.Therefore, all technician in the art
Pass through the available technology of logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Scheme, all should be in the protection domain being defined in the patent claims.
Claims (8)
1. a kind of production method of European standard R350LHT burning optimization on line rail, which is characterized in that including roll out steel rail is empty
After being cooled to 780~750 DEG C, simultaneously temperature is maintained to 590~610 DEG C of progress burning optimization on line On-line accelerated cooling, and Temperature fall obtains
To R350LHT burning optimization on line rail；Wherein, the time of burning optimization on line is 100~120s.
2. method as described in claim 1, which is characterized in that the specific steps of the roll out steel rail include：
Step 1, molten iron pretreatment；
Step 2, converter smelting；
Step 3, the refining of LF stoves；
Step 4, VD vacuum outgas；
Step 5, continuous casting；
Step 6, heating steel billet；
Step 7, roll out steel rail.
3. method as claimed in claim 2, which is characterized in that
In the step 1, the sulfur content of the pretreated molten iron of molten iron is≤0.02%；
In the step 2, when converter smelting, control tapping C content is >=0.08%, and tapping temperature is >=1630 DEG C.
4. method as claimed in claim 2, which is characterized in that in the step 3, LF stoves refine when, control basicity of slag be >=
2.0, temperature of offing normal is 1585~1595 DEG C；
The molten steel that LF stoves refine includes following weight percent composition：C 0.76~0.79%；Si 0.50~0.58%；
Mn 1.10~1.20%；P≤0.020%；S≤0.025%；Cr≤0.30%；V≤0.030%；
In the step 4, when VD vacuum outgas, the deep vacuum outgas time is >=15min, after vacuum outgas the soft blow time be >=
18min。
5. method as claimed in claim 2, which is characterized in that in the step 5, casting process uses protective casting, use low
Aluminium covering slag, secondary cooling zone use superweak cold water distribution, whole perseverance pulling rate operation；Permanent pulling rate is 0.50m/min.
6. method as claimed in claim 2, which is characterized in that in the step 6, when heating steel billet, heating strand total time is
>=2.5 hours；Preheating section temperature is≤800 DEG C, and it is≤1200 DEG C to heat one section of temperature, and it is 1100~1300 to heat two sections of temperature
DEG C, soaking zone temperature is 1100~1260 DEG C.
7. method as claimed in claim 2, which is characterized in that in the step 7, when roll out steel rail, start rolling temperature control is
1080~1150 DEG C, finishing temperature is 930~950 DEG C.
8. the R350LHT burning optimization on line rail that a kind of any one of claim 1~7 the method produces, feature exist
In the burning optimization on line rail includes the component of following weight percent：C 0.76~0.79%；Si 0.50~0.58%；
Mn 1.10~1.20%；P≤0.020%；S≤0.025%；Cr≤0.30%；V≤0.030%；
Tensile strength Rm >=1175MPa of the burning optimization on line rail, elongation after fracture A >=9%, tread hardness 350~
390HB, the cross-section 1 point 340HB of surface hardness of rail head；2 points >=331HB；3 points >=321HB；4 points >=340HB.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810231643.5A CN108504838A (en) | 2018-03-20 | 2018-03-20 | A kind of production method of European standard R350LHT burning optimization on line rail |
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| CN201810231643.5A CN108504838A (en) | 2018-03-20 | 2018-03-20 | A kind of production method of European standard R350LHT burning optimization on line rail |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112481440A (en) * | 2020-11-24 | 2021-03-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Pitting-resistant steel rail and preparation method thereof |
| CN113416818A (en) * | 2021-05-12 | 2021-09-21 | 包头钢铁（集团）有限责任公司 | Heat treatment process of high-strength and high-toughness bainite/martensite multiphase bainite steel rail |
| CN115058636A (en) * | 2022-06-27 | 2022-09-16 | 包头钢铁（集团）有限责任公司 | Production method of European standard R370CrHT on-line heat treatment steel rail |
| CN115369305A (en) * | 2022-08-23 | 2022-11-22 | 包头钢铁（集团）有限责任公司 | Smelting method of easily-welded high-speed steel rail |
| CN115433866A (en) * | 2022-08-23 | 2022-12-06 | 包头钢铁（集团）有限责任公司 | Smelting method of low-cost high-quality high-speed rail steel |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1127790A (en) * | 1995-01-25 | 1996-07-31 | 包头钢铁公司 | Steel rail in-line exhaust-heat strengthening process and its apparatus |
| CN104480390A (en) * | 2015-01-07 | 2015-04-01 | 攀钢集团攀枝花钢铁研究院有限公司 | High-impact-toughness steel rail and production method thereof |
| CN106498143A (en) * | 2016-10-20 | 2017-03-15 | 武汉钢铁股份有限公司 | A kind of burning optimization on line method and burning optimization on line system for rail |
| CN107227429A (en) * | 2017-06-19 | 2017-10-03 | 武汉钢铁有限公司 | A kind of production method of the rail containing B |
| CN107541596A (en) * | 2017-08-28 | 2018-01-05 | 芜湖中铁科吉富轨道有限公司 | A kind of burning optimization on line technique of U75V rail |
| CN107557557A (en) * | 2017-08-07 | 2018-01-09 | 包头钢铁（集团）有限责任公司 | A kind of burning optimization on line method for being used to eliminate rail abnormal structure |
-
2018
- 2018-03-20 CN CN201810231643.5A patent/CN108504838A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1127790A (en) * | 1995-01-25 | 1996-07-31 | 包头钢铁公司 | Steel rail in-line exhaust-heat strengthening process and its apparatus |
| CN104480390A (en) * | 2015-01-07 | 2015-04-01 | 攀钢集团攀枝花钢铁研究院有限公司 | High-impact-toughness steel rail and production method thereof |
| CN106498143A (en) * | 2016-10-20 | 2017-03-15 | 武汉钢铁股份有限公司 | A kind of burning optimization on line method and burning optimization on line system for rail |
| CN107227429A (en) * | 2017-06-19 | 2017-10-03 | 武汉钢铁有限公司 | A kind of production method of the rail containing B |
| CN107557557A (en) * | 2017-08-07 | 2018-01-09 | 包头钢铁（集团）有限责任公司 | A kind of burning optimization on line method for being used to eliminate rail abnormal structure |
| CN107541596A (en) * | 2017-08-28 | 2018-01-05 | 芜湖中铁科吉富轨道有限公司 | A kind of burning optimization on line technique of U75V rail |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112481440A (en) * | 2020-11-24 | 2021-03-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Pitting-resistant steel rail and preparation method thereof |
| CN113416818A (en) * | 2021-05-12 | 2021-09-21 | 包头钢铁（集团）有限责任公司 | Heat treatment process of high-strength and high-toughness bainite/martensite multiphase bainite steel rail |
| CN115058636A (en) * | 2022-06-27 | 2022-09-16 | 包头钢铁（集团）有限责任公司 | Production method of European standard R370CrHT on-line heat treatment steel rail |
| CN115369305A (en) * | 2022-08-23 | 2022-11-22 | 包头钢铁（集团）有限责任公司 | Smelting method of easily-welded high-speed steel rail |
| CN115433866A (en) * | 2022-08-23 | 2022-12-06 | 包头钢铁（集团）有限责任公司 | Smelting method of low-cost high-quality high-speed rail steel |
| CN115433866B (en) * | 2022-08-23 | 2024-02-23 | 包头钢铁（集团）有限责任公司 | Smelting method of low-cost high-quality high-speed rail steel |
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