CN108456824A - Hundred meters of scale 75kg/m hot rolled rails of one kind and its production method - Google Patents
Hundred meters of scale 75kg/m hot rolled rails of one kind and its production method Download PDFInfo
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- CN108456824A CN108456824A CN201810231525.4A CN201810231525A CN108456824A CN 108456824 A CN108456824 A CN 108456824A CN 201810231525 A CN201810231525 A CN 201810231525A CN 108456824 A CN108456824 A CN 108456824A
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- 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
-
- 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
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of hundred meters of scale 75kg/m hot rolled rails, the rail scale size is 100m；Wherein, the rail includes the component of following weight percent：C 0.72~0.80%；Si 0.50~0.58%；Mn 0.95~1.05%；V≤0.04~0.10%；P≤0.020%；S≤0.025%.The invention also discloses the production methods of hundred meters of scale 75kg/m hot rolled rails.The production method of hundred meters of scale 75kg/m hot rolled rails of the present invention, improves Rail Production efficiency, reduces energy consumption production cost；Hundred meters of obtained scale 75kg/m hot rolled rails, 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 fields, more particularly to a kind of hundred meters of scale 75kg/m hot rolled rails and its production
Method.
Background technology
With the continuous rapid development of society, using more and more, the construction of track increasingly accelerates rail transport, exists at present
The rail used in orbit construction is 75kg/m rail, is 25m scales, needs to be welded into 100m long steel to rail welding plant before upper track
Rail, then carry out laying use after being welded into 500m gapless lines.The track of laying influences to reduce rail there are more welding point
Quality and service life.Also, now with Heavy-Haul Railway, the development of speed-raising, the burden of rail increasingly aggravates, especially small
On radius curve, the abrasion of rail are very serious, therefore, higher proposed to the deformation of rail, glacing flatness, connector etc. quality
Requirement.In addition, there are low output, Energy Consumption Cost height, rail matter for the production technology of current 25m scale 75kg/m rail
Measure many defects such as bad.Therefore, to Optimal Development novel steel rail, raising rail quality and the production technology side for optimizing rail
There is an urgent need for method.
Therefore, those skilled in the art is dedicated to a kind of hundred meters of scale 75kg/m hot rolled rails of exploitation and its producer
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 25m scales in the prior art
75kg/m rail is using being laid in the presence of compared with polylinker, and the quality and service life of track are bad, Rail Production method low output, energy
Source consuming cost is high.
To achieve the above object, first aspect present invention provides a kind of hundred meters of scale 75kg/m hot rolled rails, scale
Size is 100m；Wherein, the rail includes the component of following weight percent：C 0.72~0.80%；Si 0.50~
0.58%；Mn 0.95~1.05%；V≤0.04~0.10%；P≤0.020%；S≤0.025%.
Further, tensile strength Rm >=980MPa of the rail, elongation after fracture A >=10%, tread hardness 280
~320HB, casting blank cross-section size are 320mm × 415mm.
Second aspect of the present invention provides the production method of a kind of hundred meters of scale 75kg/m hot rolled rails, including following step
Suddenly：
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, the production method of described hundred meters of scale 75kg/m hot rolled rails, in the step 1, molten iron pretreatment
The sulfur content of molten iron afterwards is≤0.02%；
Further, the production method of described hundred meters of scale 75kg/m hot rolled rails, in the step 2, when converter smelting,
Control tapping C content is >=0.08%, and tapping temperature is >=1630 DEG C；
Further, the production method of described hundred meters of scale 75kg/m hot rolled rails, in the step 3, when LF stoves refine,
It is >=2.0 to control basicity of slag, and temperature of offing normal is 1585~1595 DEG C；
Further, the production method of described hundred meters of scale 75kg/m hot rolled rails, in the step 3, LF stoves refine
To molten steel include following weight percent composition：C 0.72~0.80%；Si 0.50~0.58%；Mn 0.95~
1.05%；V≤0.04~0.10%；P≤0.020%；S≤0.025%；
Further, the production method of described hundred meters of scale 75kg/m hot rolled rails, in the step 4, VD vacuum outgas
When, the deep vacuum outgas time is >=15min, and the soft blow time is >=18min after vacuum outgas；
Further, the production method of described hundred meters of scale 75kg/m hot rolled rails, in the step 5, casting process is adopted
With protective casting, using low aluminium covering slag, secondary cooling zone uses superweak cold water distribution, whole perseverance pulling rate operation；
Further, the Cross Section of CC Billet size of the continuous casting is 320mm × 415mm, continuous casting billet length 7.6m；
Further, the production method of described hundred meters of scale 75kg/m hot rolled rails, 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, heats two sections
Temperature is 1100~1300 DEG C, and soaking zone temperature is 1100~1260 DEG C；
Further, the production method of described hundred meters of scale 75kg/m hot rolled rails, 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, the production method of described hundred meters of scale 75kg/m hot rolled rails, the step
In rapid 1, the sulfur content of the pretreated molten iron of molten iron is 0.010%；
In another better embodiment of the present invention, the production method of described hundred meters of scale 75kg/m hot rolled rails, institute
It states in step 1, 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 described hundred meters of scale 75kg/m hot rolled rails, the step
In rapid 2, when converter smelting, control tapping C content is 0.1%, and tapping temperature is 1650 DEG C；
In the better embodiment of the present invention, the production method of described hundred meters of scale 75kg/m hot rolled rails, the step
In rapid 3, when LF stoves refine, control basicity of slag is >=2.0, and temperature of offing normal is 1590 DEG C；
In the better embodiment of the present invention, the production method of described hundred meters of scale 75kg/m hot rolled rails, the step
In rapid 4, when VD vacuum outgas, the deep vacuum outgas time is 15min, and the soft blow time is 20min 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 described hundred meters of scale 75kg/m hot rolled rails, the step
In rapid 6, when heating steel billet, heating strand total time is 20 minutes 3 hours；Preheating section temperature is 723 DEG C, and the preheating section time is 30
Minute；One section of temperature of heating is 935 DEG C, and heating a period of time is 60 minutes；Two sections of 1212 DEG C of temperature are heated, when heating two sections
Between be 50 minutes；Soaking zone temperature is 1244 DEG C, and the soaking zone time is 60 minutes；
In the better embodiment of the present invention, the production method of described hundred meters of scale 75kg/m hot rolled rails, the step
In rapid 7, strand is through Rolling With Universal Mill at rail, and start rolling temperature control is 1120 DEG C, and finishing temperature is 935 DEG C.
Using above scheme, disclosed by the invention hundred meters of scale 75kg/m hot rolled rails and its production method have following
Technique effect：
(1) hundred meters of scale 75kg/m hot rolled rails of the invention are carrying out rail compared with the rail of existing 25m scales
During road is laid with, reduces the welding point on rail, improves the quality of rail, extend service life, increase safety,
Be conducive to the needs for meeting railway speed increase development；
(2) production method of hundred meters of scale 75kg/m hot rolled rails of the invention is cast using 320mm × 415mm big cross sections
Base can increase compression ratio, improve rail quality, have significant economic and social benefit；
In conclusion the production method of hundred meters of scale 75kg/m hot rolled rails of the present invention, improves Rail Production efficiency,
Reduce energy consumption production cost；Hundred meters of obtained scale 75kg/m hot rolled rails, quality is high, reduces the welding on rail
Connector 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.
Hundred meters of embodiment, 75kg/m hot rolled rail production methods, include the following steps：
1) molten iron pre-processes：Sulfur content 0.010% in molten iron；
2) converter smelting：Control tapping C content 0.1%, 1650 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 >=2.0,1590 DEG C of temperature of offing normal are controlled when LF refining；
4) VD vacuum outgas：Deep vacuum outgas time 15min, soft blow 20min 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, obtain Cross Section of CC Billet size be 320mm ×
415mm, continuous casting billet length 7.6m；
6) heating steel billet：20 points of 3 hours total times are heated, each section of heating time and heating temperature are shown in Table 1；
1 320mm of table × 415mm section heating steel billet parameters
| Preheating section | 1 section of heating | 2 sections of heating | Soaking zone | |
| Heating time | 30min | 60min | 50min | 60min |
| Temperature | 723℃ | 935℃ | 1212℃ | 1244℃ |
7) it rolls：For strand through Rolling With Universal Mill at rail, start rolling temperature is 1120 DEG C, and finishing temperature is 935 DEG C.
Through examining, obtained hot rolled rail chemical composition percentage is as follows：C：0.76%；Si：0.52%；Mn：0.98%；
P：0.017%；S：0.009%；V：0.08%；Remaining is Fe and inevitable impurity；
Through examining, obtained hot rolled rail mechanical property is as follows：Tensile strength 1231MPa, elongation after fracture 13.5%, is stepped on
Surface hardness 308HB, remaining meets the requirement of TB/T2344-2012 standards.
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 (10)
1. a kind of hundred meters of scale 75kg/m hot rolled rails, which is characterized in that the rail scale size is 100m；Wherein, described
Rail includes the component of following weight percent：C 0.72~0.80%；Si 0.50~0.58%；Mn 0.95~1.05%；V
≤ 0.04~0.10%；P≤0.020%；S≤0.025%.
2. rail as described in claim 1, which is characterized in that tensile strength Rm >=980MPa of the rail, elongation after fracture A
>=10%, tread 280~320HB of hardness, casting blank cross-section size are 320mm × 415mm.
3. the production method of a kind of hundred meters of scale 75kg/m hot rolled rails, which is characterized in that include the following steps：
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.
4. method as claimed in claim 3, 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.
5. method as claimed in claim 3, 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 0.72~0.80%；Si 0.50~0.58%；
Mn 0.95~1.05%；V≤0.04~0.10%；P≤0.020%；S≤0.025%.
6. method as claimed in claim 3, which is characterized in that in the step 4, when VD vacuum outgas, the deep vacuum outgas time
For >=15min, the soft blow time is >=18min after vacuum outgas.
7. method as claimed in claim 3, 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；
The Cross Section of CC Billet size of the continuous casting is 320mm × 415mm, continuous casting billet length 7.6m.
8. method as claimed in claim 3, 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.
9. method as claimed in claim 3, 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.
10. hundred meters of scale 75kg/m hot rolled rails that a kind of any one of claim 3~9 the method produces, feature
It is, the rail scale size is 100m；Wherein, the rail includes the component of following weight percent：C 0.72~
0.80%；Si 0.50~0.58%；Mn 0.95~1.05%；V≤0.04~0.10%；P≤0.020%；S≤0.025%；
Tensile strength Rm >=980MPa of the rail, elongation after fracture A >=10%, tread 280~320HB of hardness, casting blank section ruler
Very little is 320mm × 415mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810231525.4A CN108456824A (en) | 2018-03-20 | 2018-03-20 | Hundred meters of scale 75kg/m hot rolled rails of one kind and its production method |
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|---|---|---|---|
| CN201810231525.4A CN108456824A (en) | 2018-03-20 | 2018-03-20 | Hundred meters of scale 75kg/m hot rolled rails of one kind and its production method |
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| CN108456824A true CN108456824A (en) | 2018-08-28 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111334717A (en) * | 2020-03-20 | 2020-06-26 | 包头钢铁（集团）有限责任公司 | Method for producing 60kg/m steel rail by using 320mm × 415mm casting blank |
| CN111334718A (en) * | 2020-03-23 | 2020-06-26 | 包头钢铁（集团）有限责任公司 | European standard R260Mn steel rail and production method thereof |
| CN111691242A (en) * | 2020-05-15 | 2020-09-22 | 包头钢铁（集团）有限责任公司 | Novel head profile steel rail and production method thereof |
| CN114457287A (en) * | 2022-01-10 | 2022-05-10 | 包头钢铁（集团）有限责任公司 | High-strength steel for saw blade and production method thereof |
| CN114507806A (en) * | 2022-01-10 | 2022-05-17 | 包头钢铁（集团）有限责任公司 | Low-cost low-temperature-resistant steel rail production process |
| 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 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111334717A (en) * | 2020-03-20 | 2020-06-26 | 包头钢铁（集团）有限责任公司 | Method for producing 60kg/m steel rail by using 320mm × 415mm casting blank |
| CN111334718A (en) * | 2020-03-23 | 2020-06-26 | 包头钢铁（集团）有限责任公司 | European standard R260Mn steel rail and production method thereof |
| CN111691242A (en) * | 2020-05-15 | 2020-09-22 | 包头钢铁（集团）有限责任公司 | Novel head profile steel rail and production method thereof |
| CN114457287A (en) * | 2022-01-10 | 2022-05-10 | 包头钢铁（集团）有限责任公司 | High-strength steel for saw blade and production method thereof |
| CN114507806A (en) * | 2022-01-10 | 2022-05-17 | 包头钢铁（集团）有限责任公司 | Low-cost low-temperature-resistant steel rail production process |
| 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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Application publication date: 20180828 |