CN1107735C - Niobium rare earth steel rail - Google Patents
Niobium rare earth steel rail Download PDFInfo
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- CN1107735C CN1107735C CN99111744A CN99111744A CN1107735C CN 1107735 C CN1107735 C CN 1107735C CN 99111744 A CN99111744 A CN 99111744A CN 99111744 A CN99111744 A CN 99111744A CN 1107735 C CN1107735 C CN 1107735C
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- Prior art keywords
- temperature
- rare earth
- heating temperature
- rail
- rare
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 33
- 239000010959 steel Substances 0.000 title claims abstract description 33
- 239000010955 niobium Substances 0.000 title claims abstract description 14
- 229910052758 niobium Inorganic materials 0.000 title claims abstract description 10
- -1 Niobium rare earth Chemical class 0.000 title 1
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 13
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000009749 continuous casting Methods 0.000 claims abstract description 7
- 238000010079 rubber tapping Methods 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 6
- 229910001257 Nb alloy Inorganic materials 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 5
- 239000004615 ingredient Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 229910000592 Ferroniobium Inorganic materials 0.000 claims description 2
- 229910008455 Si—Ca Inorganic materials 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims description 2
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 claims description 2
- 238000009847 ladle furnace Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 238000007670 refining Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000003466 welding Methods 0.000 abstract description 4
- 238000003723 Smelting Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000012797 qualification Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 241001062472 Stokellia anisodon Species 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- 229910002551 Fe-Mn Inorganic materials 0.000 description 1
- 229910017082 Fe-Si Inorganic materials 0.000 description 1
- 229910017133 Fe—Si Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Heat Treatment Of Steel (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to a wear-resistant steel rail, and belongs to the steel rail smelting technology. The steel rail comprises C, Si, Mn, P, S, Nb, RE and Fe, the content of Si and Mn is properly increased on the basis of U74, rare earth and niobium are added simultaneously, and a cast pipe is adopted to feed rare earth metal wires or rare earth metal rods are hung in a die; the method of feeding rare earth metal wire in continuous casting crystallizer or LF furnace makes its elements be hard and soft, increases the strength of steel rail, reaches 980mpa grade, improves comprehensive performance, improves welding performance and heat treatment performance, and the BNbRE steel rail is suitable for important railway trunk line with large transportation volume, and has wide application prospect.
Description
The present invention relates to a kind of anvil faced rail, belong to the rail smelting technology.
(Sino-Russian etc.) once tested the rail (785～883MPa level) that adds rare earth element on the basis of common U74 both at home and abroad, improve wear resisting property to purify steel, both at home and abroad (China. Brazil etc.) also once tested on the basis of U74 the rail (883～980MPa level) that adds niobium, to gain in strength, increase the service life, but all bad, or problem such as rare earth adding method and do not reach purpose because of over-all properties.
The objective of the invention is to take on the basis of U74, suitably to improve Si.Mn content, and the method for adding rare earth and niobium simultaneously, (in the feed trumpet of die casting or mould, feed rare-earth metal wire or hang the rare earth metal rod, in the crystallizer of continuous casting or LF stove, feed rare-earth metal wire), its each element is tempered toughness with gentleness, increase the intensity of rail, improve over-all properties, improve welding property and heat treatment performance, improve wear resisting property and rail life and a kind of novel Biobium rare-earth steel rail that provides.
The objective of the invention is to take following measure to realize:
A kind of Biobium rare-earth steel rail, the chemical ingredients of rail are (%):
C Si Mn P S Nb
0.70-0.82 0.60-0.90 1.0-1.3≤.0.04≤0.04 0.02-0.05RE (add-on) Fe0.02-0.05 surplus processing method is:
At first converter will be entered after the hot metal pretreatment, add ferro-niobium and enter refining furnace, carry out continuous casting after changing vacuum oven, feeding rare-earth wires again over to, enter high-pressure water descaling after the heating, roll rail, aligning again, carry out eddy current test and carry out ultrasonic inspection again, carry out four sides gag press straightening at last, saw bores the processing back and checks warehouse-in.
1. tapping temperature
The tapping temperature of molten steel is 1600-1620 ℃
2. the adding method of rare earth, add-on:
During ingot casting: add the Fe-Nb alloy that contains niobium 50-60% in tapping process in bag, rare earth is by hanging the rare earth metal rod in fountain feeding rare-earth metal wire or the mould in casting process; During add-on 0.02-0.05% continuous casting: in tapping process, add the Fe-Nb alloy contain niobium 50-60%, in the rare-earth wires feeding crystallizer or insert the cored-wire that rare earth and Si-Ca powder are made in the ladle furnace;
3. Heating temperature:
The breaking down Heating temperature of steel ingot is 1280-1300 ℃
The Heating temperature of steel billet is 1250-1280 ℃; (instantaneous maximum heating temperature is not more than 1300 ℃)
Heating-furnace tail temperature＜700 ℃
4. cooling system to be rolled:
Breaking down (steel ingot) time to be rolled (h) 1,2,3＞3,
The reduction furnace temperature (℃) 20,40,60, reduce to 1200 ℃;
Beam-and-rail (steel billet):
Time to be rolled (h) up and down soaking temperature (℃) I Heating temperature (℃) Heating temperature under the II (℃) up and down
0.3-0.5 constant ≯ 1260 ≯ 1200
0.5-1.0 1200 ≯1220 ≯1000
1-2 ≯1100 ≯1150 ≯950
2-4 ≯900 ≯1100 ≯800
＞4 ≯800 ≯800 ≯800
BNbRE of the present invention (Baogang's Biobium rare-earth) rail belongs to 980MPa grade wear-resisting steel rail, it adopts open hearth (or converter) to smelt, in tapping process, in bag, add the Fe-Nb alloy that contains Nb50-60%, and be blown into argon gas with even composition and temperature to molten steel in the end by bag, in molten steel, add rare earth metal during casting, cast 11.23
tSteel ingot (or 9.61t steel ingot) is split into 300 * 300mm
2Or 300 * 354mm
2Square billet rolls into 50Kg/m, 60kg/m, 75kg/m rail or 82kg/m road switch track.
The invention effect:
1.BNbRE the rail strength height, good combination property σ 0.2 (MPa) σ b (MPa) δ 5 (%) ψ (%) AKV (J) KQ (MN/M
3/2) minimum value: 510 1,020 8.0 9.0 maximum values: 655 1,130 12.0 21.5 mean values: 595 1,070 10.0 14.0 4.5 39.5
2. wear resisting property is good, long service life:
BNbRE rail wear resisting property improves 1-2 doubly than U74, and improve 50% or more than U74 work-ing life.
3.BNbRE rail safe range of stress in kind improves 24% than U74.
Use 4.BNbRE rail not only can roll attitude, and because its welding property and heat treatment performance are good, can also weld with thermal treatment and use, σ b can reach more than 1200～1300Mpa after the thermal treatment.
Accompanying drawing 1 is rare earth rail continuous casting process schema of the present invention;
Below in conjunction with accompanying drawing enforcement of the present invention is described in detail:
Heat (batch) number: B921490 first (Baogang's 1# open hearth in 1992 first jar) is implemented side:
1. smelt the BNbRE steel and smelted by the 500t open hearth, its finished product chemical ingredients is (%):
C Si Mn P S Nb RE (add-on) Fe
0.76 0.73 1.08 0.020 0.018 0.027 0.040 surplus
Fe-Nb add-on (first jar): in the every bag of the 130kg 5kg tapping process, after adding Fe-Mn, Fe-Si.Al by in the artificial input jar.
RE add-on (first jar): 75kg, every dish cast fed rare-earth metal wire by wire feeder to fountain after 1 minute, and the RE filament diameter is Φ 4mm.
Steel ingot weight: 11.23t/ ingot first jar adds up to 22 ingot 246.93t.
Steel ingot qualification rate: 99%
2. cogging:
Steel ingot hangs out when being heated to 1280-1300 ℃ in the rough rolling mill, is split into 300 * 354mm by Φ 1150mm blooming mill
2Square billet.
Qualification rate: 100%
3. roll rail;
Steel billet is heated to 1250-1280 ℃ of ejection by three sections continuous furnaces of beam-and-rail factory, rolls into the 60kg/m heavy rail by Φ 950 * 1/ Φ 800 * 2/ Φ 850 * 1 milling trains---
Rail qualification rate: 99.77%
4. rail delivery performance;
1. low power: qualified
2. drop hammer: qualified
3. mechanical property:
Actual the reaching of δ 0.2MPa σ bMPa δ 5% ψ (%): 580 1,050 11.5 21.5 protocol requirements:---〉=980 〉=8---
Advantage of the present invention is: add simultaneously niobium and rare earth in rail, it is tempered toughness with gentleness, improved comprehensive Performance is improved welding performance and heat treatment performance, and the intensity (reaching the 980MPa level) that has increased rail has improved anti-Mill performance and rail life still do not have this product at present both at home and abroad, and it is applicable to the important trunk railway that freight volume is big, Have broad application prospects.
Claims (2)
1, a kind of Biobium rare-earth steel rail is characterized in that: the chemical ingredients of rail is (%):
C:0.07-0.82, Si:0.60-0.9, Mn:1.0-1.3, P≤0.04, S≤0.04, Nb:0.02-0.05, RE (add-on): 0.02-0.05, Fe: surplus.
2, the technique manufacturing method of 1 described Biobium rare-earth steel rail as requested, it is characterized in that: at first will enter converter after the hot metal pretreatment, add ferro-niobium and enter refining furnace, carry out continuous casting after changing vacuum oven, feeding rare-earth wires again over to, enter high-pressure water descaling after the heating, roll rail, aligning again, carry out eddy current test and carry out ultrasonic inspection again, carry out four sides gag press straightening at last, saw bores the processing back and checks warehouse-in, wherein:
(1), tapping temperature
The tapping temperature of molten steel is 1600-1620 ℃
(2), the adding method of rare earth:
During ingot casting: add the Fe-Nb alloy that contains niobium 50-60% in tapping process in bag, rare earth is by hanging the rare earth metal rod in fountain feeding rare-earth metal wire or the mould in casting process; During add-on 0.02-0.05% continuous casting: in tapping process, add the Fe-Nb alloy contain niobium 50-60%, in the rare-earth wires feeding crystallizer steel or insert the cored-wire that rare earth and Si-Ca powder are made in the ladle furnace;
(3), Heating temperature:
The initial orbit temperature of steel ingot is 1280-1300 ℃
The initial orbit temperature of steel billet is 1250-1280 ℃;
Heating-furnace tail temperature＜700 ℃
(4), cooling system to be rolled:
Breaking down (steel ingot) time to be rolled (h) 1,2,3＞3,
Reduce furnace temperature (℃) 20,40,60 reduce to 1200 ℃;
Beam-and-rail (steel billet):
A, time to be rolled (h) 0.3-0.5, up and down soaking temperature (℃) I is constant, up and down Heating temperature (℃) II ≯ 1260, following Heating temperature (℃) ≯ 1200;
B, time to be rolled (h) 0.5-1.0, up and down soaking temperature (℃) I1200, up and down Heating temperature (℃) II ≯ 1220, following Heating temperature (℃) ≯ 1000;
C, time to be rolled (h) 1-2, up and down soaking temperature (℃) I ≯ 1100, up and down Heating temperature (℃) II ≯ 1150, following Heating temperature (℃) ≯ 950;
D, time to be rolled (h) 2-4, up and down soaking temperature (℃) I ≯ 900, up and down Heating temperature (℃) II ≯ 1100, following Heating temperature (℃) ≯ 800;
E, time to be rolled (h)＞4, up and down soaking temperature (℃) I ≯ 800, Heating temperature (℃) II ≯ 800 time Heating temperature (℃) ≯ 800 up and down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99111744A CN1107735C (en) | 1999-08-18 | 1999-08-18 | Niobium rare earth steel rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99111744A CN1107735C (en) | 1999-08-18 | 1999-08-18 | Niobium rare earth steel rail |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1285418A CN1285418A (en) | 2001-02-28 |
| CN1107735C true CN1107735C (en) | 2003-05-07 |
Family
ID=5275269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99111744A Expired - Fee Related CN1107735C (en) | 1999-08-18 | 1999-08-18 | Niobium rare earth steel rail |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1107735C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10113219B2 (en) | 2014-06-24 | 2018-10-30 | Yanshan University | Nano-pearlite rail and process for manufacturing same |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100381596C (en) * | 2003-03-19 | 2008-04-16 | 钢铁研究总院 | Method for producing rare-earth metal screw-rod |
| CN100519812C (en) * | 2005-12-29 | 2009-07-29 | 攀枝花钢铁(集团)公司 | Production method of pearlite high-strength low-alloy steel rail steel |
| CN100480413C (en) * | 2007-09-12 | 2009-04-22 | 钢铁研究总院 | Air corrosion resistant steel |
| CN102517501A (en) * | 2011-12-30 | 2012-06-27 | 内蒙古包钢钢联股份有限公司 | High-strength rare-earth steel rail containing Cr and V |
| CN110951944A (en) * | 2019-11-27 | 2020-04-03 | 包头钢铁（集团）有限责任公司 | High-strength and high-hardness rare earth steel rail material subjected to online heat treatment and production method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08144016A (en) * | 1994-11-15 | 1996-06-04 | Nippon Steel Corp | Highly wear resisting pearlitic rail |
-
1999
- 1999-08-18 CN CN99111744A patent/CN1107735C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08144016A (en) * | 1994-11-15 | 1996-06-04 | Nippon Steel Corp | Highly wear resisting pearlitic rail |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10113219B2 (en) | 2014-06-24 | 2018-10-30 | Yanshan University | Nano-pearlite rail and process for manufacturing same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1285418A (en) | 2001-02-28 |
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