CN110468330A - Exempt to be heat-treated single-track turnout weather-resistant steel plate and preparation method - Google Patents
Exempt to be heat-treated single-track turnout weather-resistant steel plate and preparation method Download PDFInfo
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- CN110468330A CN110468330A CN201910795945.XA CN201910795945A CN110468330A CN 110468330 A CN110468330 A CN 110468330A CN 201910795945 A CN201910795945 A CN 201910795945A CN 110468330 A CN110468330 A CN 110468330A
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- 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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- 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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Abstract
Exempt to be heat-treated single-track turnout weather-resistant steel plate the invention discloses one kind, by mass percentage, it include: C:0.03-0.16%, Si:0.10-0.35%, Mn:0.70-1.60%, Cu:0.20-0.40%, Cr:0.35-0.70%, Ni:0.25-0.60%, Alt:0.01-0.08%, Nb:0.01-0.05%, Ti:0.005-0.020%, surplus is iron and unavoidable impurity.Preparation method, process includes smelting, refining, continuous casting, heating and rolling, and calculates the complete solid solubility temperature of Nb first with solubility product formula in heating process and slab is heated to the complete solid solubility temperature of Nb or more.Weather-resistant steel plate of the invention, welding performance is excellent, and has that superelevation is strong, high-ductility, high-weatherability simultaneously；Without heat treatment in production process, production cost is reduced, the production cycle is shortened.
Description
Technical field
The present invention relates to a kind of low alloy steel plates, and in particular to a kind of weather-resistant steel plate and its manufacturer for single-track turnout
Method.
Background technique
Monorail traffic system is mainly used in the intensive place of urban population, is used to transporting passengers, usually overhead, has
Advantage at low cost, pollution is small and short the construction period, and take up an area less, road center isolation strip can be efficiently used, is to improve city
One effective way of traffic.Single-track turnout is the special turnout of single track railway, and turnout junction girder turn-out track is by being driven by electricity and track
Beam or another turnout junction girder realize contraposition and form turnout, turns line needs with complete vehicle driving route.
Single-track turnout is welded by steel plate, is subjected to the test of scorching summer and freezing winter and extreme difference in temperature throughout the year, bears rainwater, ice
Freeze, the erosion of acid, alkali；In addition to being rolled repeatedly by wheel, can also at work by lasting abrasion and extruding, while also by
To a large amount of shock loading, this requires single-track turnout steel to have high intensity, high tenacity, low yield strength ratio, antidetonation and corrosion-resistant
Performance and good welding technological properties.
And it is currently used for the weather-resistant steel plate of manufacture single-track turnout, it is to be improved by improving the P content in steel plate mostly
Its corrosion resistance ignores the toughness plasticity and welding performance of steel plate.And Cu, Cr, Ni content are also relatively fewer, weather resistance is not
Foot, and manufacturing process is also relative complex, can not take into account performance and production cost.
In addition, the production method of traditional track switch is using heat treatment process, such as a kind of CN104894484A " train track switch
And the manufacturing method of train track switch steel " in the manufacturing method of train track switch steel a kind of is disclosed.The patent has adopted heat treatment side
Method improves component segregation and the uneven bring performance non-uniform phenomenon of grain size, but the process needs to carry out repeatedly to add
Heat and isothermal holding, production technology is complicated, is unfavorable for the batch production of high efficiency tissue.
A kind of bainite track switch steel is disclosed in CN102839268A " a kind of heat treatment method of bainite switch rail "
The heat treatment method of rail makes railroad turnout steel rail have good straightness.But the track switch steel in the patent is using at Multi-stage heat
The method of reason, production technology are difficult to control accurately, and production difficulty is big.
Summary of the invention
Goal of the invention: exempt to be heat-treated single-track turnout weather-resistant steel plate and preparation method the present invention provides one kind, solve
The defect of the prior art, while providing for single-track turnout that a kind of cost of alloy is low, and welding performance is excellent, at the same have superelevation it is strong,
The steel plate of high-ductility and weatherability.
Technical solution: of the invention exempts from heat treatment single-track turnout weather-resistant steel plate, by mass percentage, comprising: C:0.03-
0.16%, Si:0.10-0.35%, Mn:0.70-1.60%, Cu:0.20-0.40%, Cr:0.35-0.70%, Ni:0.25-
0.60%, Alt:0.01-0.08%, Nb:0.01-0.05%, Ti:0.005-0.020%, surplus are iron and unavoidable miscellaneous
Matter.
Wherein, in the steel plate P mass percentage are as follows: 0.008-0.015%.
The restriction reason of each ingredient of weather-resistant steel plate of the present invention is as follows:
C: it is designed using low-carbon ingredient, the higher impact flexibility to steel of carbon content, especially upper mounting plate ballistic work are very not
Benefit, and welding performance is obviously damaged, while in view of the complexity of production control, carbon content cannot be too low, therefore limits it and contain
Amount is 0.03-0.16%.
Si: silicon is deoxidant element in steelmaking process, and suitable silicon is able to suppress the segregation of manganese and phosphorus, and can pass through
Solution strengthening improves the intensity of steel, but silicone content is excessively high and can deteriorate the welding performance and low-temperature flexibility of steel, therefore limits
Its content 0.10-0.35%.
Mn: manganese is all the essential elements of deoxidation in steelmaking process, the same intensity that steel is improved by solution strengthening, in order to
Realize sufficiently high tensile strength, manganese content cannot be too low, but the excessively high welding performance and low temperature that can also deteriorate steel of manganese content
Toughness, so limiting its content 0.70-1.60%.
P: phosphorus is the element beneficial to weather resistance, and phosphorus content is too low, and weather resistance is difficult to ensure, but phosphorus content mistake
Height can deteriorate in the low-temperature flexibility of base material and welding point, especially welding process, the phosphorus in base material can excessively into weld seam,
Eutectic is formed, leads to the reduction of welding point ballistic work, therefore limits its content 0.008-0.015%.
Cu: copper can promote surface of steel plate to form the rusty scale for stablizing densification, can also improve the weather resistance of steel plate, but copper
Too high levels can cause the red brittleness in steel plate process, deteriorate surface of steel plate performance, so limit its content 0.20-
0.40%.
Cr: chromium can also effectively improve the weather resistance of steel, equally can also generate solution strengthening, but chromium is excessively high
The toughness and welding performance of steel can be reduced, therefore limits its content 0.35-0.70%.
Ni: nickel is also one of the element of weather resistance for improving steel, can promote to form stable rusty scale, and can also
Welding performance is improved, but excessively addition nickel element can dramatically increase cost, therefore, limit its content 0.25-0.60%.
Al: aluminium in steelmaking process be deoxidant element, also can reduce solid solution N atomic quantity, thus improve toughness and when
Effect becomes drag, and the AlN formed can also refine crystal grain, to further decrease ductile-brittle transition temperature, still, be excessively added
It will form large-sized Al2O3 and AlN and damage toughness；In addition Al can promote ferritic transformation, refine crystal grain, improve welding
Heat affected area toughness, so control Alt is 0.01-0.08%.
Nb: niobium can be improved the intensity of steel, meanwhile, niobium can also improve austenite recrystallization temperature, can be in higher temperature
Degree is lower to realize non-recrystallization zone rolling, but content of niobium is limited to the invigoration effect of steel after increasing, so, content is limited to
0.01-0.05%.
The weather-proof formula of index of the steel plate are as follows:
I=26.01 (%Cu)+3.88 (%Ni)+1.20 (%Cr)+1.49 (%Si)+17.28 (%P) -7.29 (%Cu)
(%Ni) -9.10 (%Ni) (%P) -33.39 (%Cu) 2, and I >=6.0%.Can guarantee good weather resistance, can in order to avoid
It is used in anticorrosive coating.
Yield strength Rp0.2 >=485MPa of the steel plate, tensile strength Rm >=585MPa, elongation percentage A >=20%, Qu Qiang
Than YR≤0.85, -40 DEG C of ballistic work KV2 >=250J.
The above-mentioned preparation method for exempting to be heat-treated single-track turnout weather-resistant steel plate, process include smelting, refining, continuous casting, heating
And rolling, and calculate the complete solid solubility temperature of Nb first with solubility product formula in heating process and be heated to slab
It is more than the complete solid solubility temperature of Nb.
The solubility product formula that the solubility product formula calculation formula used is NbC in austenite:
Lg { [Nb] [C] } γ=2.96-7510/T, wherein T is the heating temperature of continuous casting billet, unit K.
In rolling process, controlled rolling and Controlled cooling process are made steel plate, when steel billet temperature reaches 350 DEG C -500 DEG C into
Row heap is cooled to 200 DEG C or less；Self tempering is carried out using steel plate waste heat, reduces dislocation density, discharges internal stress, while increasing precipitation
Phase volume fraction adjusts microstructure, guarantees armor plate strength and toughness.
The utility model has the advantages that 1, weather-resistant steel plate of the invention, matches by using reasonable alloying component, it is lower in P content
In the case of, it is excellent to obtain welding performance, and have that superelevation is strong, high-ductility simultaneously, composition characteristic is weather-proof index I >=6.0%, tool
There is high-weatherability；2, mechanical property feature is: yield strength Rp0.2 >=485MPa, tensile strength Rm >=585MPa, elongation percentage A
>=20%, yield tensile ratio YR≤0.85, -40 DEG C of ballistic work KV2 >=250J；3, its welding performance feature is: plate thickness 40mm is below
It is not required to preheat before steel plate weldering, postwelding is not required to be heat-treated, and solderability is good, can be good at the utilization for meeting single-track turnout；4, its work
Skill feature is the manufacturing method of the weather-resistant steel plate, carries out self tempering using the waste heat after rolling, reduces dislocation density, release
Internal stress improves plate shape, while adjusting microstructure, guarantees armor plate strength and toughness；5, without heat treatment, drop in production process
Low production cost, shortens the production cycle.
Specific embodiment
Using weather-resistant steel plate manufacturing method of the invention, by smelting, refining, continuous casting, heating, rolling and with warm heap it is cold
Etc. processes obtain weather-resistant steel plate；Wherein, heating process calculates the complete solid solubility temperature of Nb first with solubility product formula, and will casting
Base is heated to the complete solid solubility temperature of Nb or more；In rolling process, steel plate is made by controlled rolling and Controlled cooling process；Steel
Heap is carried out when plate temperature reaches 350-500 DEG C is cooled to 200 DEG C hereinafter, carrying out self tempering using steel plate waste heat.
Wherein, solubility product formula of the NbC in austenite are as follows:
Lg { [Nb] [C] } γ=2.96-7510/T, wherein T is the heating temperature of continuous casting billet, unit K.
Calculation formula between weather-proof index and each chemical component are as follows:
I=26.01*Cu+3.88*Ni+1.2*Cr+1.49*Si+17.28*P-7.29*Cu*Ni-9.1 * Ni*P-33.39*
Cu*Cu。
4 groups of weather-resistant steel plates are manufactured using above-mentioned manufacturing method, the ingredient of 4 groups of weather-resistant steel plates is as follows in terms of quality %:
S1:C:0.15%, Si:0.15%, Mn:1.10%, P:0.013%, Cu:0.30%, Cr:0.40%, Ni:
0.30%, Alt:0.02%, Nb:0.030%, Ti:0.008%, I:6.20.
S2:C:0.04%, Si:0.35%, Mn:1.40%, P:0.014%, Cu:0.26%, Cr:0.63%, Ni:
0.25%, Alt:0.04%, Nb:0.020%, Ti:0.019%, I:6.49.
S3:C:0.11%, Si:0.30%, Mn:0.70%, P:0.012%, Cu:0.29%, Cr:0.50%, Ni:
0.55%, Alt:0.07%, Nb:0.010%, Ti:0.012%, I:6.90.
S4:C:0.09%, Si:0.25%, Mn:0.95%, P:0.009%, Cu:0.45%, Cr:0.35%, Ni:
0.48%, Alt:0.03%, Nb:0.050%, Ti:0.015%, I:6.14.
For the steel plate of above-mentioned 4 groups of ingredients, the different template of 2 pieces of thickness of every group of rolling, and every kind of ingredient rolls out
The template of 10mm and 40mm thickness, fabrication process parameters are as shown in table 1.First use formula lg { [Nb] [C] } γ=2.96-
7510/T calculates the full solid solubility temperature of Nb, determines continuous blank heating temperature further according to the temperature.After controlled rolling and controlled cooling
Steel plate carry out the warm heap of band and be cooled to 200 DEG C or less.
Table 1 single-track turnout weather-resistant steel plate fabrication process parameters
Mechanical property tests are carried out to 4 groups of steel plates, experimental result is as shown in table 2.It is surrendered using steel plate produced by the present invention
Intensity 513-551MPa, elongation percentage 22-27%, yield tensile ratio 0.79-0.84, -40 DEG C of ballistic works are greater than 290J, have good strong
Toughness, the matching of strong plasticity.
The mechanical property of 2 single-track turnout weather-resistant steel plate of table
Welding performance experiment is carried out to 4 pieces of templates of 40mm thickness, the results are shown in Table 3.It is not preheated before weldering, the not hot place of postwelding
Reason, under the welding of 50kJ/cm heat input, welding point tensile strength is suitable with base material value, -40 DEG C of low-temperature impacts of weld coarse crystal region
Function remains at 85J or more, and cold-bending property is good, has good weldability.
The welding performance of 3 single-track turnout weather-resistant steel plate of table
Claims (7)
1. one kind is exempted to be heat-treated single-track turnout weather-resistant steel plate, which is characterized in that by mass percentage, comprising: C:0.03-
0.16%, Si:0.10-0.35%, Mn:0.70-1.60%, Cu:0.20-0.40%, Cr:0.35-0.70%, Ni:0.25-
0.60%, Alt:0.01-0.08%, Nb:0.01-0.05%, Ti:0.005-0.020%, surplus are iron and unavoidable miscellaneous
Matter.
2. according to claim 1 exempt to be heat-treated single-track turnout weather-resistant steel plate, it is characterised in that: P in the steel plate
Mass percentage are as follows: 0.008-0.015%.
3. it is according to claim 1 exempt from be heat-treated single-track turnout weather-resistant steel plate, it is characterised in that: the steel plate it is weather-proof
Formula of index are as follows:
I=26.01 (%Cu)+3.88 (%Ni)+1.20 (%Cr)+1.49 (%Si)+17.28 (%P) -7.29 (%Cu) (%
Ni) -9.10 (%Ni) (%P) -33.39 (%Cu) 2, and I >=6.0%.
4. according to claim 1 exempt to be heat-treated single-track turnout weather-resistant steel plate, it is characterised in that: the surrender of the steel plate
Intensity Rp0.2 >=485MPa, tensile strength Rm >=585MPa, elongation percentage A >=20%, yield tensile ratio YR≤0.85, -40 DEG C of ballistic works
KV2≥250J。
5. it is a kind of exempt from be heat-treated single-track turnout weather-resistant steel plate preparation method, it is characterised in that: process include smelt, refining,
Continuous casting, heating and rolling, and calculate the complete solid solubility temperature of Nb first with solubility product formula in heating process and will cast
Base is heated to the complete solid solubility temperature of Nb or more.
6. preparation method according to claim 5, it is characterised in that: the solubility product formula calculation formula used is NbC
Solubility product formula in austenite: lg { [Nb] [C] } γ=2.96-7510/T, wherein T is the heating temperature of continuous casting billet,
Unit K.
7. preparation method according to claim 5, it is characterised in that: in rolling process, controlled rolling and control bosher
Steel plate is made in skill, and heap is carried out when steel billet temperature reaches 350 DEG C -500 DEG C and is cooled to 200 DEG C or less；Return certainly using steel plate waste heat
Fire discharges internal stress, while adjusting microstructure, guarantees armor plate strength and toughness.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910795945.XA CN110468330A (en) | 2019-08-27 | 2019-08-27 | Exempt to be heat-treated single-track turnout weather-resistant steel plate and preparation method |
| PCT/CN2019/122903 WO2021036078A1 (en) | 2019-08-27 | 2019-12-04 | Heat treatment-free and weather-resistant steel plate for monorail switch, and preparation method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910795945.XA CN110468330A (en) | 2019-08-27 | 2019-08-27 | Exempt to be heat-treated single-track turnout weather-resistant steel plate and preparation method |
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| Publication Number | Publication Date |
|---|---|
| CN110468330A true CN110468330A (en) | 2019-11-19 |
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ID=68513013
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| CN201910795945.XA Pending CN110468330A (en) | 2019-08-27 | 2019-08-27 | Exempt to be heat-treated single-track turnout weather-resistant steel plate and preparation method |
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| WO (1) | WO2021036078A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021036078A1 (en) * | 2019-08-27 | 2021-03-04 | 南京钢铁股份有限公司 | Heat treatment-free and weather-resistant steel plate for monorail switch, and preparation method therefor |
| CN114657467A (en) * | 2022-03-21 | 2022-06-24 | 包头钢铁（集团）有限责任公司 | Production method of weather-resistant steel plate with yield strength of 415MPa |
| CN114734127A (en) * | 2022-04-19 | 2022-07-12 | 南京钢铁股份有限公司 | Submerged arc welding process of 485 MPa-level thick-specification weather-resistant bridge steel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021036078A1 (en) * | 2019-08-27 | 2021-03-04 | 南京钢铁股份有限公司 | Heat treatment-free and weather-resistant steel plate for monorail switch, and preparation method therefor |
| CN114657467A (en) * | 2022-03-21 | 2022-06-24 | 包头钢铁（集团）有限责任公司 | Production method of weather-resistant steel plate with yield strength of 415MPa |
| CN114657467B (en) * | 2022-03-21 | 2023-02-21 | 包头钢铁（集团）有限责任公司 | Production method of weather-resistant steel plate with yield strength of 415MPa |
| CN114734127A (en) * | 2022-04-19 | 2022-07-12 | 南京钢铁股份有限公司 | Submerged arc welding process of 485 MPa-level thick-specification weather-resistant bridge steel |
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| Publication number | Publication date |
|---|---|
| WO2021036078A1 (en) | 2021-03-04 |
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Application publication date: 20191119 |
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