CN105063267B - The production method of high-strength alloy R320Cr rail - Google Patents
The production method of high-strength alloy R320Cr rail Download PDFInfo
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Abstract
The technical solution adopted by the present invention is：A kind of production method of high-strength alloy R320Cr rail, including the step of refining of desulfurizing iron, converter smelting, LF stoves, RH refinings, continuous casting and rolling, it is characterised in that：The converter smelting step, the weight content for controlling C in tapping is 0.01~0.02%, and it is 1640~1670 DEG C to control tapping temperature；The continuous casting step, permanent pulling rate operation, it is 0.6~0.7m/s to control pulling rate, while secondary cooling zone uses superweak cold water distribution, and it is 0.15~0.25L/kg to control specific water.Holo-Al content control in R320Cr steel 0.0025%~0.0035%, can be improved the anti-fatigue ability of rail by the inventive method；Cr yield of alloy has saved cost more than 90%；The LF heat times are 40~50min, can and continuous casting matching, fully meet rhythm of production, field trash qualification rate is up to 100%；The tensile strength Rm of gained R320Cr steel is 1130~1190MPa, and elongation after fracture A is 9%~12%, and tread hardness is 325~355HB, is met the high-quality high-strength alloy R320Cr steel strands of product requirement at lower cost.
Description
Technical field
The present invention relates to metallurgical technology, in particular to a kind of production method of high-strength alloy R320Cr rail.
Background technology
Railway great development proposes higher requirement to rail property and quality, especially more than the small curve radius or bend
Section, the problems such as conventional hot rolling U75V and U71Mn rail shows not wear-resisting, easy hurt.For improve rail performance and
Extend rail life, high strength and high hardness rail is developed into important topic.Especially abroad, such as：Southeast Asia, South America some
Countries and regions are very high to rail hardness requirement, and therefore, the R320Cr rail of high strength and high hardness has wide market prospects
With good economic benefit.
The requirement of R320Cr rail main chemical compositions is C：0.6%~0.8%, Mn：0.8%~1.2%, Si：0.5%~
1.1%, Cr：0.8%~1.2%, Al≤0.004%, O≤0.002%, H≤2.5ppm.At present, for using converter smelting-
Following technological difficulties be present in the R320Cr steel of the technique stream of LF refining-vacuum refining-continuous casting：1) R320Cr steel has high alloy
The characteristics of (Cr, Mn), alloy amount is big in smelting process, its relative to conventional U75V and U71Mn rail, except require low O and
Outside low H, Al content≤0.004% in steel is also required, because typically all containing a certain amount of Al in alloy, this is for adding
Difficulty is very big for 0.8%~1.2%Cr steel grade, and larger challenge is brought to smelting process and organization of production；2) smelting
Because alloy addition is big in journey, process control difficulties are big, the problem of rhythm of production is slow, and Cr recovery rate is low be present；3) because
, the problem of strand crack sensitivity is high be present in the high C of the high Cr of R320Cr steel.
Wuhan Iron and Steel Plant is by largely groping, and according to itself equipment condition, autonomous innovation forms the smelting process of the present invention, mesh
Preceding Wuhan Iron and Steel Plant is a domestic unique enterprise for producing high-strength alloy R320Cr rail.
The content of the invention
Present invention aim to provide a kind of production method of high-strength alloy R320Cr rail, what this method obtained
Al content≤0.004%, Cr yield of alloy >=90% in R320Cr steel, and technical process is easily achieved.
To achieve the above object, the technical solution adopted by the present invention is：A kind of producer of high-strength alloy R320Cr rail
Method, including the step of refining of desulfurizing iron, converter smelting, LF stoves, RH refinings, continuous casting and rolling, it is characterised in that：The converter
Smelting step, the weight content for controlling C in tapping is 0.01~0.02%, and it is 1640~1670 DEG C to control tapping temperature；It is described
Continuous casting step, permanent pulling rate operation, it is 0.6~0.7m/s to control pulling rate, while secondary cooling zone uses superweak cold water distribution, controls specific water
For 0.15~0.25L/kg.
Further, the converter smelting step, in tapping process, Si, Mn alloy are first added, it is rear to add Cr iron, together
When clinker is modified.
Further, the continuous casting step, using bloom continuous casting, casting process protective casting, secondary cooling zone is using superweak
Cold water distribution, it is 0.18~0.22L/kg to control specific water.
Further, the continuous casting step, the chemical component weight percentage of molten steel are as follows：C：0.73~0.78%, Si：
0.77~0.85%, Mn：0.95~1.05%, P：0.011~0.019%, S：0.002~0.008%, Al：0.0025~
0.0035%, Cr：0.93~1.0%, H：0.00006~0.00015%, remaining is Fe and inevitable impurity.
Further, the LF stoves refinement step, it is 1.8~2.2 to control basicity of slag, the heat time be 40~
50min。
Further, the RH refinement steps, it is 14~16min to control the vacuum refining time, complete refining after soft blow 5~
10min。
Further, the desulfurizing iron step, the weight content for controlling Sulfur Content in Hot Iron are 0.0005~0.0015%.
Compared with prior art, the present invention has advantages below：
First, the present invention in converter steelmaking process by controlling tapping temperature to shorten LF refining for 1640~1670 DEG C
The process heat time, matched with casting rate, so that it is guaranteed that rhythm of production, meanwhile, by controlling tapping C content be 0.01~
0.02% so that Oxygen Content in Liquid Steel is unlikely to too high during converter smelting, reduces burning loss of alloy, so as to improve receiving for Cr
Rate.
Second, because of the R320Cr steel high C of high Cr, strand crack sensitivity is high, and the present invention is cold by optimizing the two of casting process
Water distribution, secondary cooling zone use superweak cold water distribution, and it is 0.15~0.25L/kg to control specific water, solve in strand casting cycle easily
The problem of cracking；And casting process strictly controls secondary oxidation of steel, permanent pulling rate is wrapped and tied in 0.6~0.7m/s, guarantee
Brilliant device further goes the ability being mingled with.
Third, basicity of slag when present invention control LF refining is 1.8~2.2, the heat time is 40~50min, i.e.,：It is right
In the control of Al content, in addition to deoxidation mode is using the Al content in Si, Mn deoxidation and strict control raw material and auxiliary material, go back
Al content in steel is reduced by controlling basicity of slag.
Fourth, it is 14~16min that the present invention, which controls the RH vacuum refining times, avoids C in high-carbon steel and reduce under vacuo
Al in slag2O3And make Al content increase in molten steel, while also ensure that H content；RH carries out 5~10min of soft blow after having refined,
It reduce further molten steel Al content and improve Molten Steel Cleanliness.
Fifth, Holo-Al content control in R320Cr steel 0.0025~0.0035%, can be improved steel by the inventive method
The anti-fatigue ability of rail；Cr yield of alloy has saved cost more than 90%；The LF heat times are 40~50min, can and be connected
Casting matching, fully meets rhythm of production, and field trash qualification rate is up to 100%；The tensile strength Rm of gained R320Cr steel be 1130~
1190MPa, elongation after fracture A are 9~12%, and tread hardness is 325~355HB, and being met product at lower cost will
The high-quality high-strength alloy R320Cr steel strands asked.
Embodiment
With reference to specific embodiment, the present invention is described in further detail, is easy to more clearly understand the present invention,
But they do not form to the present invention and limit (percentage in following examples is percetage by weight).
Embodiment 1：
A kind of production method of high-strength alloy R320Cr rail, comprises the following steps：
1) desulfurizing iron：Sulfur content in molten iron is dropped to 0.001%；
2) converter smelting：It is 0.013% to control tapping C content, and tapping temperature is 1660 DEG C, and tapping process is firstly added
Si, Mn alloy, the later stage adds Cr iron, while adds slag charge and clinker is modified, and strictly controls the Al in raw material, auxiliary material to contain
Amount；
3) LF stoves refine：It is 2.1 strictly to control basicity of slag during LF refining, heat time 43min；
4) RH is refined：The strict control RH vacuum refining times are in 15min；
5) soft blow：RH carries out soft blow 10min after having refined, and controls argon flow amount during soft blow, it is ensured that the top of the slag is without rolling；
6) bloom continuous casting：Casting process protective casting, operated using low aluminium covering slag, and using permanent pulling rate, pulling rate exists
0.63/s, bag and crystallizer further go the ability being mingled with guarantee, while secondary cooling zone uses superweak cold water distribution, and specific water is
0.22L/kg or so, square billet is made；
7) roll：Square billet is passed through into universal rolling into rail.
After testing, the chemical component weight percentage of gained R320Cr steel is as follows：C：0.75%, Si：0.81%, Mn：
0.98%, P：0.014%, S：0.005%, Al：0.003%, Cr：0.97%, H：0.0008%, remaining is for Fe and unavoidably
Impurity；It ensure that gained R320Cr steel Holo-Al content can be controlled when 0.003%, Cr yield of alloy is 91%, LF heating
Between be 43min, can and continuous casting matching, fully meet rhythm of production, field trash qualification rate up to 100%, can lower cost smelting
Go out to meet the high-quality high-strength alloy steel R320Cr strands of product requirement；Gained R320Cr Steel Properties are as follows：Tensile strength Rm reaches
Up to 11%, tread hardness reaches 338HB by 1157MPa, elongation after fracture A.
Embodiment 2：
1) desulfurizing iron：Sulfur content in molten iron is dropped to 0.0015%；
2) converter smelting：It is 0.018% to control tapping C content, and tapping temperature is 1646 DEG C, and tapping process is firstly added
Si, Mn alloy, the later stage adds Cr iron, while adds slag charge and clinker is modified, and strictly controls the Al in raw material, auxiliary material to contain
Amount；
3) LF stoves refine：It is 1.9 strictly to control basicity of slag during LF refining；Heat time is 48min；
4) RH is refined：The strict control RH vacuum refining times are in 15min；
5) soft blow：RH carries out soft blow 8min after having refined；
6) bloom continuous casting：Casting process protective casting, operated using low aluminium covering slag, and using permanent pulling rate, pulling rate exists
0.65m/s, bag and crystallizer further go the ability being mingled with guarantee, while secondary cooling zone uses superweak cold water distribution, and specific water is
0.18L/kg or so, square billet is made；
7) roll：Square billet is passed through into universal rolling into rail.
After testing, the chemical component weight percentage of gained R320Cr steel is as follows：C：0.77%, Si：0.82%, Mn：
0.99%, P：0.015%, S：0.007%, Al：0.0028%, Cr：0.98%, H：0.0001%, remaining is Fe and can not kept away
The impurity exempted from；It ensure that gained R320Cr steel Holo-Al content can control to heat for 92%, LF in 0.0028%, Cr yield of alloy
Time is 48min, can and continuous casting matching, fully meet rhythm of production, field trash qualification rate up to 100%, can lower cost smelting
Produce the high-quality high-strength alloy steel R320Cr strands for meeting product requirement；Gained R320Cr Steel Properties are as follows：Tensile strength Rm reaches
Up to 11%, tread hardness reaches 342HB by 1166MPa, elongation after fracture A.
Embodiment 3
A kind of production method of high-strength alloy R320Cr rail, comprises the following steps：
1) desulfurizing iron：Sulfur content in molten iron is dropped to 0.0005%；
2) converter smelting：Control tapping C content be 0.01%, tapping temperature be 1670 DEG C, tapping process be firstly added Si,
Mn alloys, the later stage adds Cr iron, while adds slag charge and clinker is modified, and strictly controls the Al content in raw material, auxiliary material；
3) LF stoves refine：It is 2.2 strictly to control basicity of slag during LF refining, heat time 40min；
4) RH is refined：The strict control RH vacuum refining times are in 16min；
5) soft blow：RH carries out soft blow 5min after having refined；
6) bloom continuous casting：Casting process protective casting, operated using low aluminium covering slag, and using permanent pulling rate, pulling rate exists
0.7/s, bag and crystallizer further go the ability being mingled with guarantee, while secondary cooling zone uses superweak cold water distribution, and specific water is
0.2L/kg or so, square billet is made；
7) roll：Square billet is passed through into universal rolling into rail.
After testing, the chemical component weight percentage of gained R320Cr steel is as follows：C：0.73%, Si：0.78%, Mn：
1.04%, P：0.011%, S：0.002%, Al：0.0033%, Cr：0.94%, H：0.00009%, remaining is Fe and can not kept away
The impurity exempted from；It ensure that gained R320Cr steel Holo-Al content can control to heat for 93%, LF in 0.0033%, Cr yield of alloy
Time is 40min, can and continuous casting matching, fully meet rhythm of production, field trash qualification rate up to 100%, can lower cost smelting
Produce the high-quality high-strength alloy steel R320Cr strands for meeting product requirement；Gained R320Cr Steel Properties are as follows：Tensile strength Rm reaches
Up to 12%, tread hardness reaches 355HB by 1190MPa, elongation after fracture A.
Claims (4)
1. a kind of production method of high-strength alloy R320Cr rail, including desulfurizing iron, converter smelting, LF stoves are refined, RH is refined,
The step of continuous casting and rolling, it is characterised in that：The converter smelting step, control the weight content of C in tapping for 0.01~
0.02%, it is 1640~1670 DEG C to control tapping temperature；The continuous casting step, the operation of permanent pulling rate, control pulling rate be 0.6~
0.7m/min, while secondary cooling zone uses superweak cold water distribution, it is 0.15~0.25L/kg to control specific water；The converter smelting step
Suddenly, in tapping process, Si, Mn alloy are first added, it is rear to add Cr iron, while clinker is modified；The LF stoves refining step
Suddenly, it is 1.8~2.2 to control basicity of slag, and the heat time is 40~50min；The continuous casting step, the chemical component weight of molten steel
Percentage is as follows：C：0.73~0.78%, Si：0.77~0.85%, Mn：0.95~1.05%, P：0.011~0.019%, S：
0.002~0.008%, Al：0.0025~0.0035%, Cr：0.93~1.0%, H：0.00006~0.00015%, remaining is
Fe and inevitable impurity.
2. the production method of high-strength alloy R320Cr rail according to claim 1, it is characterised in that：The continuous casting step
Suddenly, superweak cold water distribution is used using bloom continuous casting, casting process protective casting, secondary cooling zone, control specific water for 0.18~
0.22L/kg。
3. the production method of high-strength alloy R320Cr rail according to claim 1, it is characterised in that：The RH refinings step
Suddenly, it is 14~16min to control the vacuum refining time, completes 5~10min of soft blow after refining.
4. the production method of high-strength alloy R320Cr rail according to claim 1, it is characterised in that：The desulfurizing iron
Step, the weight content for controlling Sulfur Content in Hot Iron are 0.0005~0.0015%.
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| CN109022661B (en) * | 2017-06-12 | 2020-06-23 | 鞍钢股份有限公司 | Method for reducing heavy rail steel rail damage rate |
| CN107227393B (en) * | 2017-06-19 | 2020-04-07 | 武汉钢铁有限公司 | Production method for reducing fatigue crack propagation rate of bainite steel rail |
| CN108374120A (en) * | 2018-03-21 | 2018-08-07 | 包头钢铁（集团）有限责任公司 | A kind of European standard R320Cr rail and its production method |
| CN109207691A (en) * | 2018-10-30 | 2019-01-15 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of heavy haul railway rail |
| CN116695001A (en) * | 2023-06-30 | 2023-09-05 | 武汉钢铁有限公司 | Manufacturing method for improving delayed cracking resistance of heavy rail steel |
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| CN102864275A (en) * | 2012-09-25 | 2013-01-09 | 鞍钢股份有限公司 | Control method of aluminum content of heavy rail steel |
| CN105002324B (en) * | 2015-07-10 | 2017-08-25 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method for controlling Properties of Heavy Rail Steel point-like inclusion |
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