CN107841689A - A kind of weather-resistant steel plate and its manufacture method - Google Patents
A kind of weather-resistant steel plate and its manufacture method Download PDFInfo
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- CN107841689A CN107841689A CN201710981527.0A CN201710981527A CN107841689A CN 107841689 A CN107841689 A CN 107841689A CN 201710981527 A CN201710981527 A CN 201710981527A CN 107841689 A CN107841689 A CN 107841689A
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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
- C22C38/18—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
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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
- C22C38/06—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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
- C22C38/18—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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of weather-resistant steel plate and its manufacture method, its composition contains C in terms of quality %:0.04 0.10%, Si:0.18 0.35%, Mn:1.00 1.60%, P:0.008 0.015%, Cu:0.25 0.45%, Cr:0.40 0.60%, Ni:0.30 0.50%, Alt:0.02 0.05%, Nb:0.01 0.05%, surplus is iron and unavoidable impurity.The steel plate, in the case where P content is relatively low, can just be obtained excellent welding performance and have strong superelevation, high-ductility and high-weatherability simultaneously, meet the utilization of single-track turnout well by rational composition proportion.Its manufacture method is by two-phase control rolling technique, fining austenite grains tissue repeatedly, improves armor plate strength, without quenching and tempering during production, reduces production cost, shortens the production cycle.
Description
Technical field
The present invention relates to a kind of alloy-steel plate, specifically, be related to a kind of weather-resistant steel plate for single-track turnout and its
Manufacture method.
Background technology
Single track railway is one kind of railway, and feature is that the track used only has one.It is similar with City Rail Transit System,
Single track railway is mainly used in the intensive place of urban population, for transporting passengers.Single track railway is usually overhead, has cost
It is low, pollute the small and construction period it is short the advantages of, and single track railway takes up an area few, can effectively utilize road center isolation strip, be improvement
One effective way of urban transportation.
And it is currently used for manufacturing the weather-resistant steel plate of single-track turnout, it is to be improved by improving the P content in steel plate mostly
Its corrosion resistance, ignore 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, it is impossible to take into account performance and production cost.
The content of the invention
Goal of the invention：To solve the defects of prior art, the invention provides a kind of weather-resistant steel plate, provided for single-track turnout
A kind of cost of alloy is low, and welding performance is excellent, while has the steel plate of strong superelevation, high-ductility and weatherability.
It is a further object of the present invention to provide a kind of manufacture method of weather-resistant steel plate, this method can produce above-mentioned cost with
The weather-resistant steel plate that performance is taken into account.
Technical scheme：A kind of weather-resistant steel plate of the present invention, composition contain C in terms of quality %:0.04-0.10%, Si:
0.18-0.35%, Mn:1.00-1.60%, P:0.008-0.015%, Cu:0.25-0.45%, Cr:0.40-0.60%, Ni:
0.30-0.50%, Alt:0.02-0.05%, Nb:0.01-0.05%, surplus are iron and unavoidable impurity.
The restriction reason of each composition of weather-resistant steel plate of the present invention is as follows：
C：Using low-carbon composition design, the higher impact flexibility to steel of carbon content, especially upper mounting plate ballistic work are very not
Profit, and welding performance is substantially damaged, while in view of the complexity of production control, carbon content can not be too low, therefore limits it and contain
Measure as 0.04-0.10%.
Si：Silicon is deoxidant element in steelmaking process, and appropriate silicon can suppress the segregation of manganese and phosphorus, and can be passed through
Solution strengthening improves the intensity of steel, but silicone content is too high and can deteriorate the welding performance and low-temperature flexibility of steel, therefore limits
Its content 0.18-0.35%.
Mn：Manganese is all the essential elements of deoxidation in steelmaking process, and the intensity of steel is improved again by solution strengthening, in order to
Sufficiently high tensile strength is realized, manganese content can not be too low, but the too high welding performance and low temperature that can also deteriorate steel of manganese content
Toughness, so limiting its content 1.00-1.60%.
P：Phosphorus is the element beneficial to weather resistance, and phosphorus content is too low, and weather resistance is difficult to ensure that, but phosphorus content mistake
Height, can deteriorate in the low-temperature flexibility of mother metal and welding point, particularly welding process, the phosphorus in mother metal can excessively into weld seam,
Eutectic is formed, causes the reduction of welding point ballistic work, therefore limit its content 0.008-0.015%.
Cu：Copper can promote surface of steel plate to form the rusty scale of stable 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 0.25-
0.45%.
Cr：Chromium can also effectively improve the weather resistance of steel, equally can also produce solution strengthening, but chromium is too high
The toughness and welding performance of steel can be reduced, therefore limits its content 0.40-0.60%.
Ni：Nickel is also one of 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 0.30-0.50%.
Al：Aluminium is deoxidant element in steelmaking process, can also reduce solid solution N atomic quantities, so as to improve toughness and when
Effect becomes drag, and the AlN formed can also crystal grain thinning, so as to further reducing ductile-brittle transition temperature, still, be excessively added
Large-sized Al can be formed2O3With AlN and damage toughness, so it is 0.02-0.05% to control Alt.
Nb：Niobium can improve the intensity of steel, meanwhile, niobium can also improve austenite recrystallization temperature, can be in higher temperature
Non- recrystallization zone rolling is realized under degree, but the invigoration effect after content of niobium rise to steel is limited, so, its content is defined to
0.01-0.05%.
Wherein, the composition of the steel plate also meets Cu+Cr+Ni≤1.35% in terms of quality %；Cu, Cr, Ni are to influence
The key element of steel plate weather resistance, general content is more, and weather resistance is more excellent, but Cu, Cr, Ni are also M-A islands group simultaneously
The formation element of member, easily forms M-A islands in the cooling procedure of welding heat affected zone, causes toughness to deteriorate.It is therefore weather-proof in guarantee
On the premise of performance does not reduce, Cu+Cr+Ni≤1.35%.
Carbon equivalent ce V≤0.46% of the steel plate；In conjunction with the carbon content 0.04-0.10% of steel plate, it is in steel plate
Easy welding region, ensure good solderability, and carbon equivalent can deteriorate higher than 0.46% solderability.
Welding cold cracking Sensitivity Index Pcm≤0.21% of steel plate, so that being less prone to crackle during welding, it can exempt from pre-
Heat, postwelding can also not have to heat treatment, and when Pcm is higher than 0.21%, welding is easily cracked, and postwelding need to be heat-treated elimination should
Power, solderability deteriorate.
Weather-proof index I >=6.5 of steel plate, can ensure good weather resistance, can in order to avoid anticorrosive coating use.
Further limit, the carbon equivalent ce V of the steel plate is 0.36-0.46%, the welding cold cracking Sensitivity Index of steel plate
Pcm is 0.15-0.21%, and the weather-proof index I of steel plate is 6.5-7.0.When carbon equivalent is less than 0.36%, the yield strength of steel plate
Card is relatively difficult to ensure with weather-proof index, equally, when Pcm is less than 0.15%, the yield strength of steel plate and weather-proof index are relatively difficult to ensure card, and
When I is more than 7.0, it is necessary to add substantial amounts of alloying element, cost inevitably raises, while solderability can also deteriorate.
The present invention equally also provides a kind of method for manufacturing above-mentioned weather-resistant steel plate, as follows：
Process includes smelting, refining, continuous casting, heating and rolling；Wherein, heating process is by heating strand to complete Austria
Family name's body temperature；Rolling process uses austenite recrystallization area and austenite Unhydrated cement two-phase control rolling technique；Wherein, it is difficult to understand
The rolling of family name's body recrystallization zone is rough rolling step, and roughing is by austenite recrystallization fining austenite grains repeatedly, and austenite is not again
Crystal region rolling is the finish rolling stage, and the austenite structure of hardening is obtained after finish rolling；
850-970 DEG C of the start rolling temperature in finish rolling stage, 780-860 DEG C of finishing temperature, the 10-30 seconds are stopped after finish rolling, then passed through
Cross ultrafast refrigeration technique and be cooled to 450-600 DEG C, be then air-cooled to room temperature；Austenite is stopped into 10-30s after rolling deformation, also
That is, relaxation further accelerates cooling for a period of time, is reduced using relaxation process middle position dislocation density, dislocation structure change and precipitated phase body
The increased special process of fraction, middle temperature transformation tissue is refined, in addition, relaxation process, which separates out, facilitation to forming core, and received
The precipitation particle of meter level is not only harmless to the performance of steel, and can play precipitating reinforcing effect.
Beneficial effect：Weather-resistant steel plate of the present invention, matched by using rational alloying component, it is relatively low in P content
In the case of, acquisition welding performance is excellent, and has the steel plate of strong superelevation, high-ductility and high-weatherability, its mechanical property simultaneously
Feature is：Yield strength Rp0.2 >=485MPa, tensile strength Rm >=585MPa, elongation percentage A >=20%, yield tensile ratio YR≤
0.85, -60 DEG C of ballistic work KV2 >=200J, ductile-brittle transition temperature are less than -80 DEG C.Its welding performance feature is：Below thickness of slab 60mm
Steel plate weldering before be not required to preheat, postwelding is not required to be heat-treated, and solderability is good, and welding efficiency is high, can be good at meeting single-track turnout
Utilization.The manufacture method of described weather-resistant steel plate, rolled using austenite recrystallization area and austenite Unhydrated cement two benches
Technique processed, fining austenite grains tissue, improves armor plate strength, need not quench and be tempered in production process, reduce life repeatedly
Cost is produced, shortens the production cycle.
Brief description of the drawings
Fig. 1 is the metallograph of the microscopic structure of weather-resistant steel plate.
Embodiment
With reference to embodiment, the present invention will be further described.
Using weather-resistant steel plate manufacture method of the present invention, by smelting, refining, continuous casting, the work such as heating and rolling
Sequence obtains weather-resistant steel plate of the present invention；Wherein, by heating strand to complete austenitizing temperature during heating process；Roll work
Sequence uses austenite recrystallization area and austenite Unhydrated cement two-phase control rolling technique, can also turn into roughing and finish rolling two benches
Rolling, 850-970 DEG C of the start rolling temperature in finish rolling stage, 780-860 DEG C of finishing temperature, stopped after rolling the 10-30 seconds, then by super
Fast-cooling technology is cooled to 450-600 DEG C, is then air-cooled to room temperature, such as Fig. 1, and metallograph shows micro- group of the weather-resistant steel plate
It is woven to careful ferrite+bainite+pearlitic grain tissue.
Wherein, the calculation formula between the value of carbon equivalent and each chemical composition is：
CEV (%)=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15.
Calculation formula between welding cold cracking Sensitivity Index and each chemical composition is：
Pcm (%)=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B.
Calculation formula between weather-proof index and each chemical composition is：
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。
Six groups of weather-resistant steel plates are manufactured using above-mentioned manufacture method, the composition of six groups of weather-resistant steel plates is as follows in terms of quality %：
S1：C：0.04%, Si：0.35%, Mn：1.20%, P：0.012%, Cu：0.30%, Cr：0.40%, Ni：
0.30%, Alt：0.02%, Nb：0.035%, CEV：0.36%, Pcm：0.15%, I：6.50 Cu+Cr+Ni=1.0%.
S2：C：0.06%, Si：0.18%, Mn：1.40%, P：0.015%, Cu：0.25%, Cr：0.60%, Ni：
0.45%, Alt：0.04%, Nb：0.015%, CEV：0.46%, Pcm：0.19%, I：6.50 Cu+Cr+Ni=1.3%.
S3：C：0.1%, Si：0.35%, Mn：1.10%, P：0.014%, Cu：0.25%, Cr：0.55%, Ni：
0.45%, Alt：0.04%, Nb：0.01%, CEV：0.44%, Pcm：0.21%, I：6.70 Cu+Cr+Ni=1.25%.
S4：C：0.04%, Si：0.35%, Mn：1.00%, P：0.008%, Cu：0.45%, Cr：0.6%, Ni：
0.30%, Alt：0.02%, Nb：0.01%, CEV：0.38%, Pcm：0.16%, I：6.50 Cu+Cr+Ni=1.3%.
S5：C：0.08%, Si：0.34%, Mn：1.00%, P：0.015%, Cu：0.30%, Cr：0.55%, Ni：
0.5%, Alt：0.05%, Nb：0.05%, CEV：0.41%, Pcm：0.19%, I：7.00 Cu+Cr+Ni=1.35%.
S6：C：0.04%, Si：0.35%, Mn：1.60%, P：0.08%, Cu：0.30%, Cr：0.5%, Ni：0.4%,
Alt：0.03%, Nb：0.02%, CEV：0.45%, Pcm：0.18%, I：6.70 Cu+Cr+Ni=1.2%.
For the steel plate of above-mentioned 6 groups of compositions, the different model of 2 pieces of thickness of every group of rolling, and every kind of composition rolls out
Model thick 60mm, its fabrication process parameters are as shown in table 1：
Each single-track turnout weather-resistant steel plate fabrication process parameters of table 1
Mechanical property tests are carried out to 6 groups of steel plates, experimental result is as shown in table 2：
The mechanical property of each single-track turnout weather-resistant steel plate of table 2
Welding performance experiment is carried out to 6 pieces of thick 60mm models, as a result as shown in table 3：
The welding performance of each single-track turnout weather-resistant steel plate of table 3
Above experimental data fully demonstrates weather-resistant steel plate of the present invention and possesses good weather resistance and welding performance.
Claims (6)
1. a kind of weather-resistant steel plate, it is characterised in that the composition of the steel plate contains C in terms of quality %:0.04-0.10%, Si:
0.18-0.35%, Mn:1.00-1.60%, P:0.008-0.015%, Cu:0.25-0.45%, Cr:0.40-0.60%, Ni:
0.30-0.50%, Alt:0.02-0.05%, Nb:0.01-0.05%, surplus are iron and unavoidable impurity.
2. weather-resistant steel plate according to claim 1, it is characterised in that the composition of the steel plate also meets Cu in terms of quality %
+ Cr+Ni≤1.35%.
3. weather-resistant steel plate according to claim 1, it is characterised in that carbon equivalent ce V≤0.46% of the steel plate, welding
Cooling cracks the susceptible index number Pcm≤0.21%, weather-proof index I >=6.5.
4. weather-resistant steel plate according to claim 3, it is characterised in that the carbon equivalent ce V of the steel plate is 0.36-
0.46%, welding cold cracking Sensitivity Index Pcm are 0.15-0.21%, and weather-proof index is 6.5-7.0.
5. the manufacture method of the weather-resistant steel plate according to claim 1-4 any one, it is characterised in that process includes smelting
Refining, refining, continuous casting, heating and rolling；Wherein, heating process is by heating strand to complete austenitizing temperature；Roll work
Sequence uses austenite recrystallization area and austenite Unhydrated cement two-phase control rolling technique.
6. the manufacture method of weather-resistant steel plate according to claim 5, it is characterised in that in rolling process, austenite is not again
850-970 DEG C of the start rolling temperature of crystal region rolling sequence, 780-860 DEG C of finishing temperature, the 10-30 seconds are stopped after rolling, then passed through
Ultrafast refrigeration technique is cooled to 450-600 DEG C, is then air-cooled to room temperature.
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| CN201710981527.0A CN107841689B (en) | 2017-10-19 | 2017-10-19 | A kind of weather-resistant steel plate and its manufacturing method |
| PCT/CN2018/088135 WO2019076048A1 (en) | 2017-10-19 | 2018-05-24 | Weatherable steel plate and manufacturing method therefor |
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| CN201710981527.0A CN107841689B (en) | 2017-10-19 | 2017-10-19 | A kind of weather-resistant steel plate and its manufacturing method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108425068A (en) * | 2018-05-16 | 2018-08-21 | 中唐空铁科技有限公司 | A kind of steel can be used as bridge steel plate and empty iron traveling wheel support plate |
| CN108642382A (en) * | 2018-05-16 | 2018-10-12 | 中唐空铁科技有限公司 | A kind of weathering steel and empty iron track girder |
| WO2019076048A1 (en) * | 2017-10-19 | 2019-04-25 | 南京钢铁股份有限公司 | Weatherable steel plate and manufacturing method therefor |
| CN110468330A (en) * | 2019-08-27 | 2019-11-19 | 南京钢铁股份有限公司 | Exempt to be heat-treated single-track turnout weather-resistant steel plate and preparation method |
| CN110592486A (en) * | 2019-10-21 | 2019-12-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Niobium-containing 550 MPa-grade thick weathering resistant steel and production method thereof |
| CN114160580A (en) * | 2021-11-22 | 2022-03-11 | 南京钢铁股份有限公司 | Cooling method for improving flatness of weathering steel A709Gr50 |
| RU2790559C1 (en) * | 2019-08-27 | 2023-02-22 | Наньцзин Айрон Энд Стил Ко., Лтд. | Weather-resistant steel sheet for monorail arrow without heat treatment and method of its manufacture |
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| WO2019076048A1 (en) * | 2017-10-19 | 2019-04-25 | 南京钢铁股份有限公司 | Weatherable steel plate and manufacturing method therefor |
| CN108425068A (en) * | 2018-05-16 | 2018-08-21 | 中唐空铁科技有限公司 | A kind of steel can be used as bridge steel plate and empty iron traveling wheel support plate |
| CN108642382A (en) * | 2018-05-16 | 2018-10-12 | 中唐空铁科技有限公司 | A kind of weathering steel and empty iron track girder |
| CN108642382B (en) * | 2018-05-16 | 2023-11-21 | 黑冻科技有限公司 | Weathering steel and empty track roof beam for iron |
| CN110468330A (en) * | 2019-08-27 | 2019-11-19 | 南京钢铁股份有限公司 | Exempt to be heat-treated single-track turnout weather-resistant steel plate and preparation method |
| 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 |
| RU2790559C1 (en) * | 2019-08-27 | 2023-02-22 | Наньцзин Айрон Энд Стил Ко., Лтд. | Weather-resistant steel sheet for monorail arrow without heat treatment and method of its manufacture |
| CN110592486A (en) * | 2019-10-21 | 2019-12-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Niobium-containing 550 MPa-grade thick weathering resistant steel and production method thereof |
| CN114160580A (en) * | 2021-11-22 | 2022-03-11 | 南京钢铁股份有限公司 | Cooling method for improving flatness of weathering steel A709Gr50 |
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| WO2019076048A1 (en) | 2019-04-25 |
| CN107841689B (en) | 2019-09-27 |
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