CN114507816A - Corrosion steel rail for coal transportation special line and manufacturing method thereof - Google Patents
Corrosion steel rail for coal transportation special line and manufacturing method thereof Download PDFInfo
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- CN114507816A CN114507816A CN202210023071.8A CN202210023071A CN114507816A CN 114507816 A CN114507816 A CN 114507816A CN 202210023071 A CN202210023071 A CN 202210023071A CN 114507816 A CN114507816 A CN 114507816A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 56
- 239000010959 steel Substances 0.000 title claims abstract description 56
- 239000003245 coal Substances 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims description 19
- 230000007797 corrosion Effects 0.000 title abstract description 18
- 238000005260 corrosion Methods 0.000 title abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 14
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 13
- 239000012535 impurity Substances 0.000 claims abstract description 11
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
- 229910052802 copper Inorganic materials 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 9
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 9
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000011572 manganese Substances 0.000 claims description 11
- 238000007670 refining Methods 0.000 claims description 10
- 238000005096 rolling process Methods 0.000 claims description 10
- 238000010079 rubber tapping Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 238000009749 continuous casting Methods 0.000 claims description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000011574 phosphorus Substances 0.000 claims description 4
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 3
- -1 aluminum-silicon-manganese Chemical compound 0.000 claims description 3
- 229910000720 Silicomanganese Inorganic materials 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 238000005275 alloying Methods 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 12
- 238000012360 testing method Methods 0.000 abstract description 5
- 238000005098 hot rolling Methods 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 7
- 238000007654 immersion Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 239000005997 Calcium carbide Substances 0.000 description 1
- 229910000616 Ferromanganese Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000008396 flotation agent Substances 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
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
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/085—Rail sections
-
- 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
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C21D2211/005—Ferrite
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a corrosive steel rail for a special coal conveying line, which comprises the following chemical components in percentage by weight: c: 0.58% -0.66%, Si: 0.38% -0.45%, Mn: 0.75-0.85%, Cu: 0.50-0.60%, Cr: 0.15% -0.30%, Ni: 0.25-0.35%, P: 0.015 to 0.035 percent, and the balance of Fe and inevitable impurities. Its preparing process is also disclosed. The brinell hardness of the steel rail delivered in a hot rolling state of the invention is as follows: 260-300 (HBW), the tensile strength is not less than 880(Rm/MPa), the elongation is not less than 10%, and the corrosion performance is more than 140% of that of a U71Mn steel rail under the circulating water accelerated corrosion test condition.
Description
Technical Field
The invention relates to the field of metallurgy and metal materials, in particular to a corroded steel rail for a special coal conveying line and a manufacturing method thereof.
Background
The steel rail can be subjected to different corrosion conditions when exposed to different environments, and the corrosion states of the steel rail are different in dry, sand blown, humid and sultry areas. China has wide breadth, different climatic conditions and different industrial development degrees, and therefore, different corrosion conditions exist. Water, air, acid, alkali, salt, various pollutants and the like in the natural environment are important conditions for causing metal corrosion. At present, the steel rail for the special coal transportation line station yard in China is seriously corroded, coal loaded by a train contains more water, after the train is loaded, the water in the coal gradually seeps downwards due to the action of gravity and continuously flows out from the gap of the train, so that the steel rail is always in a water immersion state, an oxide film on the surface of the steel rail is damaged due to coal loading and unloading friction or other reasons, a metal basal plane is partially exposed, and the corrosion of the steel rail is accelerated. In addition, a large amount of particle suspended matters exist, a certain amount of flotation agents such as kerosene, diesel oil, fatty alcohol, fatty acid and the like need to be added into the coal slime during flotation, the PH value of a certain amount of impurities contained in residual coal water is changed between 6.6 and 7.29, and the corrosion of the steel rail is further aggravated by water mixed with the impurities.
At present, no relatively mature material variety and application technology which can be completely industrialized exist on the aspect of improving the strength and the corrosion resistance of the steel rail. The present invention has been made to solve the above problems.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a corrosive steel rail for a coal transportation special line and a manufacturing method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
the corrosive steel rail for the special coal conveying line comprises the following chemical components in percentage by weight: c: 0.58% -0.66%, Si: 0.38% -0.45%, Mn: 0.75-0.85%, Cu: 0.50-0.60%, Cr: 0.15% -0.30%, Ni: 0.25% -0.35%, P: 0.015 to 0.035 percent, and the balance of Fe and inevitable impurities.
Further, the chemical components comprise the following components in percentage by weight: c: 0.65%, Si: 0.41%, Mn: 0.81%, Cu: 0.59%, Cr: 0.24%, Ni: 0.32%, P: 0.016% and the balance of Fe and inevitable impurities.
Further, the chemical components comprise the following components in percentage by weight: c: 0.60%, Si: 0.41%, Mn: 0.82%, Cu: 0.50%, Cr: 0.30%, Ni: 0.29%, P: 0.016% and the balance of Fe and inevitable impurities.
Further, the chemical components comprise the following components in percentage by weight: c: 0.66%, Si: 0.45%, Mn: 0.81%, Cu: 0.59%, Cr: 0.24%, Ni: 0.30%, P: 0.016% and the balance of Fe and inevitable impurities.
A manufacturing method of a corrosive steel rail for a coal transportation special line comprises the following steps:
1) production in a converter
In order to ensure the product quality and accurately control the components of the finished product, the molten iron of the converter is required to be: according to the mass percentage, the phosphorus content is less than or equal to 0.15 percent, and the sulfur content is less than or equal to 0.04 percent; adding slagging auxiliary materials in the smelting process of the converter, and adding ferrosilicon, silicomanganese and aluminum-silicon-manganese to perform deoxidation alloying according to the component requirements of a finished product in the tapping process;
2) LF and VD furnace production
According to the requirements of producing low-oxygen steel, LF adopts refining slag with medium alkalinity and strong reducibility to treat molten steel, and the deep vacuum time is 15-20/min; the soft blowing time of the deep vacuum degree is 7-9/kpa, the soft blowing time is 18-22/min, and the temperature after VD is 1536-1546/DEG C;
3) continuous casting production
In the continuous casting production, the superheat degree is controlled to be between 15 and 30 ℃, and the drawing speed is between 0.6 and 0.7 m/min;
4) rolling of steel rails
Strictly controlling the heating temperature and the heating time of the steel billet, wherein the tapping temperature of the steel billet is 1080-1160 ℃, and reasonably selecting the descaling pressure to ensure that each billet can be effectively descaled; the initial rolling temperature is controlled to be 1080-1160 ℃, and the final rolling temperature is controlled to be 930-960 ℃.
Compared with the prior art, the invention has the beneficial technical effects that:
the brinell hardness of the steel rail delivered in a hot rolling state of the invention is as follows: 260-300 (HBW), the tensile strength is not less than 880(Rm/MPa), the elongation is not less than 10%, and the corrosion performance is more than 140% of that of a U71Mn steel rail under the circulating water accelerated corrosion test condition.
Detailed Description
A manufacturing method of a corrosive steel rail for a coal transportation special line comprises the following steps: the method comprises the following steps of molten iron pretreatment, converter smelting, LF refining, VD vacuum treatment, continuous casting, slow cooling, heating, rolling, straightening, flaw detection, inspection, processing and warehousing.
The specific process parameters are controlled as follows:
1. converter production
During converter smelting, lime, dolomite and iron sheet are added according to actual conditions, and silicon manganese and aluminum manganese titanium are added in the tapping process.
The carbon content, phosphorus content (mass percent) and tapping temperature of the molten steel at the end of the converter are shown in Table 1.
TABLE 1 composition and temperature of converter tapping
| Tapping temperature of DEG C | The content of the carbon is% | Phosphorus content of tapping | |
| Minimum value | 1605 | 0.04 | 0.010 |
| Maximum value | 1660 | 0.12 | 0.07 |
| Mean value of | 1635 | 0.07 | 0.13 |
2. LF and VD furnace production
And (3) refining in the LF furnace, adding auxiliary materials for slagging according to the components and temperature change of the molten steel, and adding alloy for fine adjustment and heating operation. Adding lime, fluorite, alumina, calcium carbide and alloy according to the refining in-place components to finely adjust ferromanganese and ferrosilicon, wherein the temperature and the processing time of the molten steel are shown in a table 2, and the vacuum processing time, the vacuum depth, the post-VD temperature and the standing time are controlled according to the VD furnace temperature and are shown in a table 3.
TABLE 2 refining LF furnace temperature control
| Refining in-place temperature DEG C | The refining off-site temperature is lower | Refining treatment time min | |
| Minimum value | 1522 | 1613 | 25 |
| Maximum value | 1598 | 1650 | 58 |
| Mean value of | 1560 | 1626 | 39 |
TABLE 3 refining VD furnace temperature control
3. Continuous casting production
In the continuous casting production, the superheat degree is controlled between 19 and 30 ℃, the drawing speed is between 0.60 and 0.70m/min, and the specification of the billet is 280mm multiplied by 380 mm.
4. Rolling of rails
The heating temperature and the heating time of the steel billet are strictly controlled, the tapping temperature of the steel billet is 1080-1160 ℃, the temperature of the heating section is 1100-1300 ℃, the temperature of the soaking section is 1100-1280 ℃, and the uniform heating temperature of the steel billet is ensured. And the descaling pressure is reasonably selected to ensure that each blank is effectively descaled. The initial rolling temperature is controlled to be 1080-1160 ℃. The heating process comprises the following steps:
TABLE 4 billet heating Process
Descaling the surface of the billet by high-pressure water; the initial rolling temperature (mainly the second pass of BD 1) is controlled to be 1060-1130 ℃; the straightening temperature of the steel rail is not more than 60 ℃, the straightened steel rail is straight, cannot have wave bending, hard bending and obvious distortion, and is only allowed to be straightened by a roller once; the rail is required to be inspected by ultrasonic flaw detection one by one. The full length of the steel rail should be continuously subjected to ultrasonic flaw detection, and the defect of the artificial defect equivalent which exceeds phi 2.0mm should not be detected.
Example 1:
chemical components of the finished steel:
TABLE 5 chemical composition of rails%
| Composition (I) | C | Si | Mn | Cu | P | Cr | Ni |
| 0.65 | 0.41 | 0.81 | 0.59 | 0.016 | 0.24 | 0.22 |
The performance of the steel rail is as follows: the structure is pearlite and micro ferrite; tread hardness 288 HB; the mechanical properties are as follows: the tensile strength Rm was 1003MPa and the elongation A was 12.5%. According to the condition that the steel rail is always in a water immersion state, a corrosion test is carried out by adopting a rotary lacing film method according to the national standard GB/T18175-2000, and the corrosion resistance is 142 percent of that of the hot-rolled U71Mn steel rail.
Example 2:
chemical components of the finished steel:
TABLE 6 chemical composition of rails%
| Composition (I) | C | Si | Mn | Cu | P | Cr | Ni |
| 0.60 | 0.41 | 0.82 | 0.50 | 0.016 | 0.30 | 0.29 |
The performance of the steel rail is as follows: the structure is pearlite and micro ferrite; tread hardness 284 HB; the mechanical properties are as follows: the tensile strength Rm was 962MPa, and the elongation A was 12%. According to the fact that the steel rail is always in a water immersion state, a corrosion test is carried out by adopting a rotary hanging piece method according to the national standard GB/T18175-2000, and the corrosion resistance is 159% of that of the hot-rolled U71Mn steel rail.
Example 3:
chemical components of the finished steel:
TABLE 9 chemical composition of rails%
| Composition (I) | C | Si | Mn | Cu | P | Cr | Ni |
| 0.66 | 0.45 | 0.81 | 0.59 | 0.016 | 0.24 | 0.30 |
The performance of the steel rail is as follows: the structure is pearlite; tread hardness 290 HB; the mechanical properties are as follows: the tensile strength Rm was 1030MPa, and the elongation A was 10%. According to the condition that the steel rail is always in a water immersion state, a corrosion test is carried out by adopting a rotary hanging piece method according to the national standard GB/T18175-2000, and the corrosion resistance is 151 percent of that of the hot-rolled U71Mn steel rail.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (5)
1. A corrosive steel rail for a coal transportation special line is characterized in that: the chemical components of the material comprise the following components in percentage by weight: c: 0.58% -0.66%, Si: 0.38% -0.45%, Mn: 0.75-0.85%, Cu: 0.50-0.60%, Cr: 0.15% -0.30%, Ni: 0.25% -0.35%, P: 0.015 to 0.035 percent, and the balance of Fe and inevitable impurities.
2. The corrosive steel rail for the special coal conveying line according to claim 1, which is characterized in that: the chemical components of the material by weight percentage are as follows: c: 0.65%, Si: 0.41%, Mn: 0.81%, Cu: 0.59%, Cr: 0.24%, Ni: 0.32%, P: 0.016% and the balance of Fe and inevitable impurities.
3. The corrosive steel rail for the special coal conveying line according to claim 1, which is characterized in that: the chemical components of the material by weight percentage are as follows: c: 0.60%, Si: 0.41%, Mn: 0.82%, Cu: 0.50%, Cr: 0.30%, Ni: 0.29%, P: 0.016% and the balance of Fe and inevitable impurities.
4. The corrosive steel rail for the special coal conveying line according to claim 1, which is characterized in that: the chemical components of the material by weight percentage are as follows: c: 0.66%, Si: 0.45%, Mn: 0.81%, Cu: 0.59%, Cr: 0.24%, Ni: 0.30%, P: 0.016% and the balance of Fe and inevitable impurities.
5. The method for manufacturing a corroded steel rail for a special line for coal transportation according to any one of claims 1 to 4, wherein the method comprises the following steps: the method comprises the following steps:
1) production in a converter
In order to ensure the product quality and accurately control the components of the finished product, the molten iron of the converter is required to be: according to the mass percentage, the phosphorus content is less than or equal to 0.15 percent, and the sulfur content is less than or equal to 0.04 percent; adding slagging auxiliary materials in the smelting process of the converter, and adding ferrosilicon, silicomanganese and aluminum-silicon-manganese to perform deoxidation alloying according to the component requirements of a finished product in the tapping process;
2) LF and VD furnace production
According to the requirements for producing low-oxygen steel, LF adopts refining slag with medium alkalinity and strong reducibility to treat molten steel, and the deep vacuum time is 15-20/min; the soft blowing time of the deep vacuum degree is 7-9/kpa, the soft blowing time is 18-22/min, and the temperature after VD is 1536-1546/DEG C;
3) continuous casting production
In the continuous casting production, the superheat degree is controlled to be between 15 and 30 ℃, and the drawing speed is between 0.6 and 0.7 m/min;
4) rolling of steel rails
Strictly controlling the heating temperature and the heating time of the steel billet, wherein the tapping temperature of the steel billet is 1080-1160 ℃, and reasonably selecting the descaling pressure to ensure that each billet can be effectively descaled; the initial rolling temperature is controlled to be 1080-1160 ℃, and the final rolling temperature is controlled to be 930-960 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210023071.8A CN114507816A (en) | 2022-01-10 | 2022-01-10 | Corrosion steel rail for coal transportation special line and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210023071.8A CN114507816A (en) | 2022-01-10 | 2022-01-10 | Corrosion steel rail for coal transportation special line and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114507816A true CN114507816A (en) | 2022-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210023071.8A Pending CN114507816A (en) | 2022-01-10 | 2022-01-10 | Corrosion steel rail for coal transportation special line and manufacturing method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101818312A (en) * | 2010-01-19 | 2010-09-01 | 钢铁研究总院 | Corrosion resistant heavy rail steel with excellent strength-toughness, fatigue resistance and abrasive resistance |
| CN104060187A (en) * | 2014-07-14 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Corrosion-resistant microalloyed steel and steel rail and preparation method of corrosion-resistant microalloyed steel and steel rail |
| CN111020378A (en) * | 2019-11-18 | 2020-04-17 | 包头钢铁（集团）有限责任公司 | Steel rail resistant to corrosion of tunnel environment |
| CN113981330A (en) * | 2021-10-28 | 2022-01-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Corrosion-resistant steel rail and detection method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101818312A (en) * | 2010-01-19 | 2010-09-01 | 钢铁研究总院 | Corrosion resistant heavy rail steel with excellent strength-toughness, fatigue resistance and abrasive resistance |
| CN104060187A (en) * | 2014-07-14 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Corrosion-resistant microalloyed steel and steel rail and preparation method of corrosion-resistant microalloyed steel and steel rail |
| CN111020378A (en) * | 2019-11-18 | 2020-04-17 | 包头钢铁（集团）有限责任公司 | Steel rail resistant to corrosion of tunnel environment |
| CN113981330A (en) * | 2021-10-28 | 2022-01-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Corrosion-resistant steel rail and detection method thereof |
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