CN107841689B - A kind of weather-resistant steel plate and its manufacturing method - Google Patents
A kind of weather-resistant steel plate and its manufacturing method Download PDFInfo
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- CN107841689B CN107841689B CN201710981527.0A CN201710981527A CN107841689B CN 107841689 B CN107841689 B CN 107841689B CN 201710981527 A CN201710981527 A CN 201710981527A CN 107841689 B CN107841689 B CN 107841689B
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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
-
- 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
-
- 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
The invention discloses a kind of weather-resistant steel plate and its manufacturing methods, its ingredient contains C: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% in terms of quality %, and surplus is iron and unavoidable impurity.The steel plate is by reasonable composition proportion, in the lower situation of P content, can obtain excellent welding performance and have strong superelevation, high-ductility and high-weatherability simultaneously, meet the utilization of single-track turnout well.Its manufacturing method is by two-phase control rolling technique, fining austenite grains tissue repeatedly, improves armor plate strength, without quenching and tempering when production, reduces production cost, shortens the production cycle.
Description
Technical field
The present invention relates to a kind of alloy-steel plate, in particular to a kind of weather-resistant steel plate for single-track turnout and its
Manufacturing method.
Background technique
Single track railway is one kind of railway, feature be using track there was only one.It is similar with City Rail Transit System,
Single track railway is mainly used in the intensive place of urban population, is used to transporting passengers.Single track railway is usually overhead, has cost
Advantage low, pollution is small and short the construction period, and single track railway land occupation is few, can efficiently use road center isolation strip, is to improve
One effective way of urban transportation.
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.
Summary of the invention
Goal of the invention: for the defect for solving the prior art, the present invention provides a kind of weather-resistant steel plates, provide for single-track turnout
A kind of cost of alloy is low, and welding performance is excellent, while having the steel plate of strong superelevation, high-ductility and weatherability.
It is a further object of the present invention to provide a kind of manufacturing 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 solution: a kind of weather-resistant steel plate of the present invention, ingredient contain C:0.04-0.10%, Si in terms of quality %:
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 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 0.04-0.10%.
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 0.18-0.35%.
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 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, 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 0.25-
0.45%.
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 0.40-0.60%.
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 0.30-0.50%.
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 Al2O3With AlN and damage toughness, so control Alt is 0.02-0.05%.
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%.
Wherein, the ingredient 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 the island M-A group simultaneously
The formation element of member, easily forms the island M-A in the cooling procedure of welding heat affected zone, toughness is caused to deteriorate.Therefore it is weather-proof in guarantee
Under 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 guarantees good solderability, and carbon equivalent is higher than 0.46% solderability and can deteriorate.
Welding cold cracking Sensitivity Index Pcm≤0.21% of steel plate can exempt from pre- to make to be less prone to crackle when welding
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 and answer
Power, solderability deteriorate.
Weather-proof index I >=6.5 of steel plate, can guarantee good weather resistance, can in order to avoid anticorrosive coating use.
It further limits, 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 lower than 0.36%, the yield strength of steel plate
It is relatively difficult to guarantee with weather-proof index, equally, when Pcm is lower than 0.15%, the yield strength of steel plate and weather-proof index are relatively difficult to guarantee, and
When I is greater than 7.0, need to add a large amount of alloying element, cost inevitably increases, 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 that slab is heated to complete Austria
Family name's body temperature；Rolling process uses austenite recrystallization area and austenite Unhydrated cement two-phase control rolling technique；Wherein, 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, stops 10-30 seconds, then pass through after finish rolling by 780-860 DEG C of finishing temperature
It crosses ultrafast refrigeration technique and is 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, reduced using relaxation process Dislocations density, dislocation structure variation and precipitated phase body
The increased special process of fraction refines middle temperature transformation tissue, in addition, relaxation process precipitation has facilitation to forming core, and receives
The precipitation particle of meter level is not only harmless to the performance of steel, but also can play precipitating reinforcing effect.
The utility model has the advantages that weather-resistant steel plate of the present invention, matches by using reasonable alloying component, it is lower in P content
In the case where, acquisition welding performance is excellent, and has the steel plate of strong superelevation, high-ductility and high-weatherability, 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 lower than -80 DEG C.Its welding performance feature is: plate thickness 60mm or less
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 manufacturing method of the weather-resistant steel plate is rolled using austenite recrystallization area and austenite Unhydrated cement two stages
Technique processed, fining austenite grains tissue, improves armor plate strength, is not necessarily to quenching and tempering in production process, reduces life repeatedly
Cost is produced, the production cycle is shortened.
Detailed description of the invention
Fig. 1 is the metallograph of the microscopic structure of weather-resistant steel plate.
Specific embodiment
Below with reference to embodiment, the present invention will be further described.
Using weather-resistant steel plate manufacturing method of the present invention, by works such as smelting, refining, continuous casting, heating and rollings
Sequence obtains weather-resistant steel plate of the present invention；Wherein, slab is heated to complete austenitizing temperature when heating process；Roll work
Sequence uses austenite recrystallization area and austenite Unhydrated cement two-phase control rolling technique, can also become roughing and finish rolling two stages
Rolling, 850-970 DEG C of the start rolling temperature in finish rolling stage, stop 10-30 seconds after rolling by 780-860 DEG C of finishing temperature, using 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 component are as follows:
CEV (%)=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15.
Calculation formula between welding cold cracking Sensitivity Index and each chemical component are as follows:
Pcm (%)=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B.
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。
Six groups of weather-resistant steel plates are manufactured using above-mentioned manufacturing method, the ingredient 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 ingredients, the different template of 2 pieces of thickness of every group of rolling, and every kind of ingredient rolls out
The template of 60mm thickness, fabrication process parameters are as shown in table 1:
1 each single-track turnout weather-resistant steel plate fabrication process parameters of table
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 templates of 60mm thickness, the results are shown in Table 3:
The welding performance of each single-track turnout weather-resistant steel plate of table 3
The above experimental data sufficiently demonstrates weather-resistant steel plate of the present invention and has good weather resistance and welding performance.
Claims (1)
1. a kind of weather-resistant steel plate for single-track turnout, which is characterized in that the ingredient 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 not can avoid
Impurity；The ingredient of the steel plate also meets Cu+Cr+Ni≤1.35% in terms of quality %；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 I is 6.5-7.0；
The steel plate is manufactured using following process: including smelting, refining, continuous casting, heating and rolling；Wherein, heating process be by
Slab is heated to complete austenitizing temperature；Rolling process uses austenite recrystallization area and austenite Unhydrated cement two stages
Rolling mill practice；In rolling process, 850-970 DEG C of start rolling temperature of austenite Unhydrated cement rolling sequence, finishing temperature
It 780-860 DEG C, is stopped 10-30 seconds after rolling, is cooled to 450-600 DEG C using ultrafast refrigeration technique, 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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| CN107841689B (en) * | 2017-10-19 | 2019-09-27 | 南京钢铁股份有限公司 | A kind of weather-resistant steel plate and its manufacturing method |
| 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 |
| 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 |
| 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 |
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| CN105331880A (en) * | 2015-11-12 | 2016-02-17 | 江阴兴澄特种钢铁有限公司 | High-strength weather-proof bridge steel and preparation method thereof |
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| WO2019076048A1 (en) | 2019-04-25 |
| CN107841689A (en) | 2018-03-27 |
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